Wording removed by a change is shown struck through, as in the original. 16 changes, 62 other letters.
Changes made
Intake Boots Correction
#33028 from Formula/Sports Racing Committee · Rule change · TB 22-09 (2022-09 Fastrack)
In F500, GCR section 9.1.1.D.14.A, change as follows: “Carburetor mounting must be of individual runners, with no balance pipes and no plenums unless fitted as standard as on the Rotax 493 and 593 engines. The use of the intake plenum/resonator on the 493 and 593 engines is optional. If the intake resonator is removed the resulting holes MUST be completely plugged and the plugs must be held in place by appropriate clamps. Plugs may be of any material and must serve no other purpose than to plug the holes originally intended for the resonator. 38mm i Intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 1 (last 6 digits 867862 1 are embossed on the boot), or Kimpex 07-100-33, or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 must be used for the 493 and 593 non-HO engines. Moto Tassinari V-Force V3120-794A-2 Reed Valve System may be used with any
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allowed intake boot on the 493 and 593 non-HO engines. 38mm i Intake boots, BPP 420867882 (last 6 digits 867882 are embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 must be used for the 2003 593 HO engine, and 38mm i ntake boots, BPP 420867879 (last 6 digits 867879 are embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 must be used for the 2004-2007 593 HO engines. Supercharging, turbocharging, and direct fuel injection are prohibited.”
Ensure availability of ECU for Rotax engines
#32695 from Carl Wassersleben · Rule change · TB 22-08 (2022-08 Fastrack)
In F500, GCR section 9.1.1.D.14, add a new section as follows: "N. Alternate ECU for Rotax engines: The use of the Ingi Tech Sparker ignition part number DCP-CDI-P2 is permitted."
Clarify stepped exhaust header references
#32743 from Club Racing Board · Rule change · TB 22-07 (2022-07 Fastrack)
In F500, GCR section 9.1.1.D.15.G, add the following: "The exhaust system and exhaust manifold are unrestricted, within SCCA safety regulations, except that stepped diameter exhaust headers are not allowed. This prohibition does not include the exhaust flange area immediately adjacent to the cylinder head." In F500 Engine Table, Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 spec lines, add the following: "Stepped diameter exhaust headers are not allowed"
593 carb boot availability and oil pump clarification
#32527 from CARL WASSERSLEBEN · Rule change · TB 22-06 (2022-06 Fastrack)
In F500, GCR section 9.1.1.D.14.A, change as follows: "Carburetor mounting shall must be of individual runners, with no balance pipes, and no plenums unless fitted as standard as on the Rotax 493 and 593 engines. The use of the intake plenum/resonator on the 493 and the 593 engines is optional. If the intake resonator is removed the resulting holes MUST be completely plugged and the plugs must be held in place by appropriate clamps. Plugs may be of any material and must serve no other purpose than to plug the holes originally intended for the resonator. 38mm intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 (last 6 digits 867862 are embossed on the boot), or Kimpex 07-100-33, or Moto Tassinari V-Force 3 Reed Valve System V3124-873B- 2 shall must be used for the 493 and 593 non-HO engines. 38mm intake boots, BPP 420867882 (last 6 digits 867882 are
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embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 shall must be used for the 2003 593 HO engine, and 38mm intake boots, BPP 420867879 (last 6 digits 867879 are embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 shall must be used for the 2004-2007 593 HO engines. Supercharging, turbocharging, and direct fuel injection are prohibited." In F500, GCR section 9.1.1.D.14, add a new section as follows: "M. The stock oil injection pump, oil lines, and control cables may be removed from all Rotax engines. The oil injection ports may be removed and plugged as necessary."
E&O class name
#32194 from Formula/Sports Racing Committee · Rule change · TB 22-03 (2022-03 Fastrack)
In F500, GCR section 9.1.1.D.19, change as follows: "All F500 cars competing in Majors Races and the Runoffs must have the AIM part #X47KPFSOLO2R0 data box mount installed on the vehicle to provide the necessary mounting of the AIM Solo or Solo 2 data box."
In F5, GCR section 9.1.1.D, add a new section as follows: "19. All F5 cars competing in Majors Races and the Runoffs must have the AIM part #X47KPFSOLO2R0 data box mount installed on the vehicle to provide the necessary mounting of the AIM Solo or Solo 2 data box. The mounting surface is to be approximately oriented either horizontally or vertically either parallel or perpendicular to the longitudinal axis of the car and must be accessible from the exterior of the car with the driver on board -- it should have a view of the sky and not be located under carbon fiber or metallic bodywork. Sufficient space should be left between the mounting plate and the surface to which it is attached to permit the use of zip ties/tie straps to restrain the data box to the mounting plate. The purpose of this requirement is to allow the random placement of data boxes on cars on pre-grid by SCCA assigned personal and the collection of the box when the car exits
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the race track. Contact AIM and their distributors for direct purchase."
Clarify allowable assisted shifting systems
#30871 from Formula/Sports Racing Committee · Rule change · TB 21-08 (2021-08 Fastrack)
In F5, GCR section 9.1.1.D.6.B.4, make changes as follows: "All gear changes must be initiated and made completed by the driver. Only mechanical gear shifting mechanisms are permitted. This may include cables, rods, or other mechanical linkage systems. All other shifting mechanisms are not permitted. This prohibition shall include electric solenoid shifters, air-shifters, etc. and other devices not mechanically actuated and controlled completely by the driver. Devices that allow pre-selected gear changes and closed-loop systems that use feedback from sensors to vary the timing of the gear selection process are also prohibited. Devices that interact with the throttle, ignition, or fuel system during a shift operation (for example: ignitions cuts, flat shifters, blippers) are permitted, but no such devices shall remove the driver's control of the gear change initiation, gear selection or
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completion. The burden of proving that a device is in compliance with this rule shall be upon the competitor."
Request to correct terminology
#30976 from Jim Murphy · Rule change · TB 21-08 (2021-08 Fastrack)
In F5, GCR section 9.1.1.D.1, change as follows: "A class for single seat, open wheel, rigid limited suspension race cars using either a snowmobile-derived engine and drive components or a 600cc motorcycle engine."
Request to Allow Rotax 593 HO Engine
#30712 from Jack Walbran · Rule change · TB 21-06 (2021-06 Fastrack)
In F500, GCR section 9.1.1.D.14, Snowmobile Derived Engines, add the following: "Rotax 593 in a carbureted, non-HO or HO version;" In F500, GCR section 9.1.1.D.14.A, add the following: "38mm intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 (last 6 digits 867862 are embossed on the boot), or Kimpex 07-100-33, shall be used for the 493 and 593 non-HO engines. 38mm intake boots, BPP 420867882 (last 6 digits 867882 are embossed on the boot) shall be used for the 2003 593 HO engine, and BPP 420867879 (last 6 digits 867879 are embossed on the boot) shall be used for the 2004-2007 593 HO engines." In F500, GCR section 9.1.1.D.14.I.3, add the following:
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"Rotax 593 non-HO (0.010" overbore): Rotax P/N 420889171" In F500, GCR section 9.1.1.D.14.J.3, add the following: "Rotax 593 non-HO engine only: Rotax OEM 0.010" overbore piston (P/N 420889171)." In F500, GCR section 9.1.1.D.14.K, add the following: "Rotax 593 non-HO engine only:" In F500 Engine Table, add the following: F500 Version/Model Weight (lbs) Inlet Restrictor Outlet Restriction Notes Rotax 593* Carbureted HO version (03-07) 875 MA0242SP1020A or MA0242SP1063A Y-pipe exhaust manifold and single expansion chamber (ref 9.1.1.D.14.B) Note 1 and 4. Restrictor size and type is to be displayed by the following designation: 593 RSTR
In the F500 engine table, update as follows: "Suzuki GSXR600 (03-13 19)"
Request for Cockpit Adjustment of External Jetting Devices
#28359 from Scott Thorp · Rule change · TB 20-07 (2020-08 Fastrack)
Thank you for your letter. After reviewing the response to the WDYT published in the May 2020 Fastrack Minutes, the Club Racing Board does not recommend this change.
Two Stroke Motors (reply to #28359 WDYT)
#28816 from Jim Murphy · Rule change · TB 20-07 (2020-08 Fastrack)
Thank you for your letter. Please see the response to letter #28359 in this Fastrack.
Re letter requesting driver adjustable carb mixture
#28840 from Jay Novak · Rule change · TB 20-07 (2020-08 Fastrack)
Thank you for your letter. Please see the response to letter #28359 in this Fastrack.
#28359 WDYT Request for Cockpit Adjustment
#28875 from Richard Schmidt · Rule change · TB 20-07 (2020-08 Fastrack)
Thank you for your letter. Please see the response to letter #28359 in this Fastrack.
Change 600cc restrictor size
#27883 from Formula/Sports Racing Committee · Rule change · TB 20-01 (2020-01 Fastrack)
In the F500 engine table, change the restrictor as follows: Honda CBR600RR (03-13): "29 28mm Flat Plate Intake Restrictor" In the F500 engine table, change the restrictor as follows: Suzuki GSXR600 (03-13): "29 28mm Flat Plate Intake Restrictor" In the F500 engine table, change the restrictor as follows: Yamaha R6 (03-13): "29 28mm Flat Plate Intake Restrictor" Table 1 Car Engine Wheel
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Width (in) ± .060 Aero Transmission Weight Notes USF2000 Tube Frame 2.0 Liter Mazda MZR See notes See notes See notes See notes Car must comply with the 2012 Pro USF2000 rules. Competitors must have the current rules in their possession and present them upon request. The following sections of the 2012 Pro rules do not apply: 14.1.1 thru 14.1.4; 14.12.2 thru 14.12.13; 14.13.1; 14.13.2; 14.13.5; 14.18 in its entirety; 14.19 in its entirety; 14.27 in its entirety; 13.34 in its entirety
Request for Weight Increase for Motorcycle Powered Cars
In the F500 engine table, change the weight as follows: Honda CBR600RR (03-13): "875 900" In the F500 engine table, change the weight as follows: Suzuki GSXR600 (03-13): "875 900" In the F500 engine table, change the weight as follows: Yamaha R6 (03-13): "875 900"
Other letters
Make This Class More Attractive
#33094 from Jim Murphy · No action required · Minutes (2022-12 Fastrack)
Thank you for your letter. We have received a number of letters in 2022 on the topic of the balance of performance between the two- and four-stroke F500 platforms. Please see, for example, the response to letter #32813 in the September 2022 Fastrack. That response outlines how we have been, and will be, monitoring performance between F500 platforms using the AiM devices to determine performance balance, leading to potential adjustments. If adjustment were indicated and generally accepted weight or restrictor adjustments were considered inadequate or ineffective, the Club Racing Board would consider your suggestion to limit the two-strokes to specifically approved parts to reduce performance. With regard to your recommendation to make two-strokes more attractive to newcomers, the Club Racing Board believes this is a good idea, but it would be best accomplished by class stakeholders and not by rules adjustments. Stakeholders in other classes
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have put together class-specific documents to help improve car counts as well as the overall racing experience. These documents typically include tech tips, setup tips, parts suppliers, available parts, etc. These kinds of materials help both newcomers as well as current competitors. There are a number of places where newcomers can get advice on initial setup and parts selection and availability. These include the “SCCA F500 & FModified” Facebook page, as well as the following suppliers who offered to be contacted by newcomers for introductory advice and guidance: - Dan McMahan, Atlanta, GA, 678-836-6467 (motorcycle engine conversions / support various cars) - Leon Mitchell, Mitchell Racing Services, Indianapolis, IN, 317-490-6514. (Scorpion supplier / support various cars) - Mike Quadrini, QRE, New York, NY, 231-590-903 (Invader builder/supplier / general support ) - Mel Winnie, M&M Sports Center, Michigan, Bus: 231-369-4300, Mobile: 231-590-9003 (two stroke engines / general support)
Request to Equal the Weight Between the 593HO and the MC Cars
#32974 from Jim Murphy · Not recommended · Minutes (2022-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #32813 in this Fastrack.
V Force Reed Valves
#32973 from Jim Murphy · No action required · Minutes (2022-09 Fastrack)
Thank you for your letter. With regard to the advertiser's claims of improved performance, on-track data will be obtained at the 2022 Runoffs from various platforms, including any two-cycle cars equipped with the Moto Tassinari parts, and adjustments will be made for 2023 if warranted by the data. With regard to the carb boots, please see the response to letter #33028 in this Fastrack's Technical Bulletin.
Request Reduction in Minimum Weight
#32962 from Sven de Vries · Not recommended · Minutes (2022-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #32813 in this Fastrack.
Clarification and questions for letter #32527 - intake boots F600
#32906 from Brad Smith · No action required · Minutes (2022-09 Fastrack)
Thank you for your letter. With regard to the concerns of potential increased performance, on-track data will be obtained at the 2022 Runoffs from various platforms, including any two-cycle cars equipped with the Moto Tassinari parts, and adjustments will be made for 2023 if warranted by the data. Please see the response to letter #33028 in this Fastrack's Technical Bulletin.
Change the Weight of the 4 Cycle F600 Cars Back to 875 Lb.
#32846 from CALVIN STEWART · Not recommended · Minutes (2022-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #32813 in this Fastrack.
Data Analysis Letter #2
#32813 from Clint McMahan · Not recommended · Minutes (2022-09 Fastrack)
Thank you for your letter. While the supplied 2020 Runoffs results data indicated certain locations where the 593 non-HO's speeds were slightly higher than those of the 600cc, analysis of the data obtained from cars equipped with AiM data boxes during that event did not show that the 593 non-HO had a clear performance advantage over two 600cc cars in those sectors. AiM data was recently obtained from various platforms at the 2022 June Sprints, and a careful review of this data also did not show that the two-cycle platform had a clear performance advantage over the four-cycle platform. Analysis of the June Sprints data did show that one car may have an apparently significant but brief advantage over another car at a specific location within a sector, while not having an overall performance advantage over the other car in that sector. This kind of brief advantage most often results from a difference in powertrain characteristics of the two-cycle and four-cycle platforms. AiM data will be obtained
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from various platforms during the 2022 Runoffs, including any two-cycle cars equipped with the Moto Tassinari part, and adjustments will be made for 2023 if warranted by the data.
Moto Tassinari V-Force 3 Reed Valve System V3124-873B2
#32739 from Clint McMahan · Not recommended · Minutes (2022-07 Fastrack)
Thank you for your letter. Neither the race results nor the AiM data from the 2020 Runoffs shows that the two-cycle platform had a performance advantage over the four-cycle platform. On-track data will be obtained at the June Sprints and Runoffs from various platforms, including any two-cycle cars equipped with the Moto Tassinari part, and adjustments will be made for 2023 if warranted by the data.
Supports changing class name to F600 or F6
#32235 from Calvin Stewart · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Opposes F500 Class Name
#32232 from Aaron Ellis · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Supports F600 name change
#32231 from Aaron Fitzsimmons · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Support F500 Change to F600
#32223 from Lance C Spiering · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Should the class name be changed to F600 (F6)
#32222 from Scott Thorp · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Letter #31896 - Support Name Change for F500
#32221 from H. Cory McLeod · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in this Fastrack’s Minutes.
Class Name Change
#31896 from keith joslyn · Recommended to the Board · Minutes (2022-04 Fastrack)
In F500, GCR section 9.1.1.D, change as follows: "FORMULA 500 600 PREPARATION RULES" "Formula 500 600 (F500 600) Specifications" "9.1.1. F500 600 Spec Lines" In F500, GCR section 9.1.1.D.1, change as follows: "Formula 500 600 is a restricted class." In F500, GCR section 9.1.1.D.14, change as follows: "The AMW engine approved for F500 600 use shall must be the AMW model no. 250-2 RC2, two-cylinder, two-cycle, liquid-
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cooled, reed-valve engine with a nominal bore and stroke of 72mm x 61mm and a displacement of 497cc." In F500, GCR section 9.1.1.D.19, change as follows: "All F500 600 cars competing in Majors Races and the Runoffs must have the AIM part #X47KPFSOLO2R0 data box mount installed on the vehicle to provide the necessary mounting of the AIM Solo or Solo 2 data box." In F500 engine table, change as follows: "F500 600" In GCR CONTENTS, change as follows: "FORMULA 500 600 PREPARATION RULES" In Racing Rules and Procedures, GCR section 6.4.4, change as follows: "In all SCCA competitions, engines shall must be started by the driver sitting in the normal driving position, except F500 600 cars with two-cycle engines, using an on-board or supplemental power supply." In Cars and Equipment, GCR section 9.1.1, change as follows: "Formula 500 600 (F5 6)" In Cars and Equipment, GCR section 9.3.12, change as follows: "On all carburetors (except SU, Sports Racing cars with motorcycle-type carburetors, Formula 500 F600 two-cycle Mikuni VM38, and F600 motorcycle-engine cars) equipped with a non-threaded fuel inlet fitting, the fitting shall must be replaced by drilling and tapping the carburetor body for a threaded fitting." In Cars and Equipment, GCR section 9.4.5.C.1, change as follows: "F500 600 cars up to 875 900 pounds may use 1020 DOM mild steel roll cage bracing with a 1.0" diameter by .065 wall thickness." In Cars and Equipment, GCR section 9.4.5.C.2, change as follows: "F500 600 cars up to 875 900 pounds may use 1020 DOM mild steel roll cage bracing with a 1.0" diameter by .065 wall thickness." In Appendix B, GCR section 1.4.2.D, change as follows: "It is preferable not to combine FA, FB, FC, FE, and FM with FV and/or F500 600. FV may be combined with F500 600." In P2 Table 1, AMAC, Asteck, Cheetah, Decker, Fox, LeGrand, Converted F500 cars spec line, change the marque as follows: "Converted F500 600 cars" In P2 Table 1, AMAC, Asteck, Cheetah, Decker, Fox, LeGrand, Converted F500 cars spec line, change the notes as follows: "Converted F500 600 cars must retain suspension compliant with F500 600 requirements and meet all P2 non-spec line requirements except minimum width is 55 inches."
#31896 (Keith Joslyn) Should the class name be changed to F600
#32082 from Jim Murphy · No action required · Minutes (2022-03 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your comments.
Response to WDYT re: letter number 31896 (Class name change)
#32052 from Scott Mackela · No action required · Minutes (2022-03 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your comments.
2022 Rule Change Request
#31997 from Jeff Jorgenson · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board will continue to monitor class performance and will make adjustments if warranted by the data.
Class Name Change
#31920 from Keith Joslyn · No action required · Minutes (2022-02 Fastrack)
Thank you for your letter. Please see the response to letter #31896 in current Fastrack.
Class Name Change
#31896 from Keith Joslyn · Member feedback requested · Minutes (2022-02 Fastrack)
Should the class name be changed to F600 (F6)? Please reply via the letter log system.
Weight Reduction for all Rotax Powered F500 Cars
#31895 from Darrel Greening · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board will continue to monitor class performance and will make adjustments if warranted by the data.
Weight Reduction Request
#31880 from Rick Eskola · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board will continue to monitor class performance and will make adjustments if warranted by the data.
F5 Weight Adjustment Request
#31744 from Steve Jondal · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board will continue to monitor class performance and will make adjustments if warranted by the data.
Time to Take Back Two Expensive Allowances
#31519 from Jim Murphy · No action required · Minutes (2021-12 Fastrack)
Thank you for your letter. The Club Racing Board is seeking input on whether a prohibition of tire warmers should apply to all classes effective 1/1/2022. The request is not specific to the F500 class. Please see the response to letter #30855 in the October 2021 Fastrack Minutes. Regarding the issue of assisted shifting systems, please see the response to letter #30871 in the August 2021 Fastrack Technical Bulletin.
Tire warmers/Shifters #30855
#31450 from Wiley McMahan · No action required · Minutes (2021-12 Fastrack)
Thank you for your letter. The Club Racing Board is seeking input on whether a prohibition of tire warmers should apply to all classes effective 1/1/2022. The request is not specific to the F500 class. Please see the response to letter #30855 in the October 2021 Fastrack Minutes. Regarding the issue of assisted shifting systems, please see the response to letter #30871 in the August 2021 Fastrack Technical Bulletin.
Rubber Mounts for Engine Support and Longevity
#31422 from brad smith · Not recommended · Minutes (2021-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change because the rules already allow engine vibration isolation. The language is adequate as written.
Interest in FSRAC / Resume
#31321 from Jack Walbran · No action required · Minutes (2021-11 Fastrack)
Jack Walbran has been added to the Formula/Sports Racing Advisory Committee.
Request for Weight Adjustments in F5
#30957 from Steve Jondal · Not recommended · Minutes (2021-08 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. The Rotax 593 HO's minimum weight was recently established using comparative dyno data for the 593 HO and 593 non-HO engines, and time needs to be afforded this determination in order to meaningfully evaluate the 593 HO's competitiveness relative to the other platforms. On-track data obtained at the 2020 National Championship Runoffs and the 2021 June Sprints Super Tour event does not support the requested weight reduction for the Rotax 593 non-HO platform.
Matching weight
#30866 from Wiley McMahan · Not recommended · Minutes (2021-08 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. On-track data obtained at the 2020 National Championship Runoffs and the 2021 June Sprints Super Tour event does not support a reduction of the minimum weight for 600cc motorcycle engine cars. The Club Racing Board will continue to monitor class performance and make appropriate, data-based adjustments as necessary.
Update rule for shifting mechanisms
#30865 from Wiley McMahan · Not recommended · Minutes (2021-08 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #30871 in this Fastrack's Technical Bulletin.
F5 HO engine addition
#30854 from Christopher Basela · Not recommended · Minutes (2021-08 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Dyno data for the Rotax 593 HO and non-HO engines does not show a ten horsepower difference between the engines, and on-track data obtained at the 2020 National Championship Runoffs and the 2021 June Sprints Super Tour event does not support removal of the 593 non-HO's intake restrictors.
Supplement to Letter #30712
#30728 from Jack Walbran · Taken care of · Minutes (2021-07 Fastrack)
Thank you for your letter. Please see the response to letter #30712 in the June 2021 Fastrack Technical Bulletin.
F500 Exhaust Header Support
#30442 from Carl Maier · No action required · Minutes (2021-05 Fastrack)
Thank you for your letter. Please see the response to letter #30427 in this Fastrack.
Support for Letter #30427
#30434 from John Spitler II · No action required · Minutes (2021-05 Fastrack)
Thank you for your letter. Please see the response to letter #30427 in this Fastrack.
Support for Letter #30427
#30433 from John Spitler · No action required · Minutes (2021-05 Fastrack)
Thank you for your letter. Please see the response to letter #30427 in this Fastrack.
Request stepped header design for 600cc motorcycle engines
#30427 from Eric McRee · Not recommended · Minutes (2021-05 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. No evidence of a need for stepped headers has been provided, nor has comparative dyno data been submitted. Without such information, the Club Racing Board cannot justify removal of the prohibition of stepped headers, which would almost certainly be perceived as a benefit to cars with 600cc motorcycle engines.
Class Participation
#29758 from S. Jay Novak · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. At the 2020 Runoffs at Road America, a two-cycle car qualified second fastest (0.096sec off pole position), set the fastest lap of the race (by 0.152sec), and finished 0.584sec behind the winning car. Please see also the responses to letters #28677 and #28673 in the April 2020 Fastrack Minutes, letter #28068 in the February 2020 Fastrack Minutes, and letter #27515 in the December 2019 Fastrack Minutes.
Request to Increase the Wheelbase
#29570 from Jim Murphy · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change because it would effectively require competitors to lengthen the wheelbase of all existing cars. Please see the response to letter #27420 in the October 2019 Fastrack Minutes.
Support for letter #29453
#29459 from John SpitletII · No action required · Minutes (2020-10 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your comments. Please see the response to letter #29453 in this Fastrack.
Request performance adjustments for Rotax 494/493 Powered Cars
#28817 from Scott Thorp · Not recommended · Minutes (2020-07 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board has adjusted the minimum weight and inlet restrictor on 600cc motorcycle-engine cars and the Board of Directors has CLUB RACING BOARD approved the use of external jetting devices on two-cycle cars. Time needs to be afforded these changes to evaluate their effectiveness in promoting competition between the two platforms.
Request removal motorcycle engines in F500
#28677 from Stanley Novak · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #27515 in the December 2019 Fastrack Minutes and the response to letter #27883 in the January 2020 Fastrack Technical Bulletin.
Suggestion to save F500
#28673 from Stanley Novak · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #27515 in the December 2019 Fastrack Minutes.
Request to clarify rule change procedure for F500 rear spoiler
#28185 from Jim Murphy · No action required · Minutes (2020-03 Fastrack)
Thank you for your letter. The Club Racing Board recommended this rule change in March 2018. Please see the response to letter #23870, April 2018 Fastrack Minutes. After the proper comment period, the Board of Directors approved the proposed change as recommended in its August 2018 meeting. Please see the response to letter #23870, October 2018 Fastrack Board of Directors Minutes. The rule change went into effect January 1, 2019.
Performance of 4-Stroke and 2-Stroke in F500
#27737 from Chuck McAbee · No action required · Minutes (2019-12 Fastrack)
Thank you for your letter. Please see the response to letter #27515 in this Fastrack.
F500 in Trouble!
#27664 from S. Jay Novak · Not recommended · Minutes (2019-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. The Formula/Sports Racing Committee capably advises the Club Racing Board on matters relating to the F500 class and there is no plan to create an F500 ad hoc committee. The Club Racing Board will continue to monitor class performance and will make appropriate, data-based adjustments as necessary.
Request to remove motorcycle-powered cars from the class
#27515 from Jay Novak · Not recommended · Minutes (2019-12 Fastrack)
Thank you for your letter. This change is not recommended. The Club Racing Board recently added 25 lbs. to the 4-stroke cars and recommended allowing the 2-stroke cars to use external jetting devices; the latter has not yet been seen in competition and time needs to be afforded these changes to determine if they will be effective in increasing 2-stroke participation. In addition, the F500 class participation numbers show that the 4-stroke cars could not meet a 4.0 participation average as a separate class, and there is no basis for concluding that the 2-stroke cars could meet a 4.0 participation average if the 4- stroke cars were removed from the class. The Club Racing Board will continue to monitor class performance and will make appropriate adjustments as necessary.
Request to Increase Wheelbase for F5
#27420 from Jason Martin · Not recommended · Minutes (2019-10 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change because it would effectively require competitors to lengthen the wheelbase of all existing cars.
Allow External Jetting Devices on F500 Carbureted Engines
#27397 from Scott Thorp · Recommended to the Board · Minutes (2019-10 Fastrack)
In F500, GCR section 9.1.1.D.14.A, add the following: "Carburetors: The induction system is restricted to two (2) 38mm Mikuni VM 38 round slide carburetors (except AMW). No modifications are permitted to the carburetor bodies. The use of any jets or jet needles is permitted. External carburetor jetting devices such as Mikuni Power Jet, Thunder PowerJet, Dial-A-Jet, IntelAJet, or other similar devices may be used, provided they are plumbed to the float bowl and body of the carburetor for which they are installed. Cockpit adjustment of external jetting devices is prohibited."
Please Apply the Weight Change after the Runoffs
#27358 from Calvin Stewart · Not recommended · Minutes (2019-10 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend changing the implementation date because this adjustment does not represent a significant change for most cars.
Weight Increase of Motorcycle Powered Cars In Lieu of Restrictor
#27255 from Craig Laprade · No action required · Minutes (2019-09 Fastrack)
Thank you for your letter. Please see the response to letter #27214 in this Fastrack's Technical Bulletin.
Weight Increase for Motorcycle Powered Cars
#27220 from George Bugg · No action required · Minutes (2019-09 Fastrack)
Thank you for your letter. Please see the response to letter #27214 in this Fastrack's Technical Bulletin.
Weight Increase for Motorcycle Powered Cars
#27218 from Zak Morvik · No action required · Minutes (2019-09 Fastrack)
Thank you for your letter. Please see the response to letter #27214 in this Fastrack's Technical Bulletin.
Request for Rule Clarification for F500 Motorcycle Engine
#27073 from James Weida · No action required · Minutes (2019-08 Fastrack)
Thank you for your letter. Sleeving a throttle body to assist air flow through a flat plate intake restrictor is not permitted. F500 is a restricted class, and any allowable modifications, changes, or additions are stated in the rules. The rules applicable to 600cc motorcycle engines state that "Fuel injection, if used, must be stock and unmodified for the model and year of the engine that is used."
Request for Cockpit Adjustment of External Jetting Devices
#28359 from Scott Thorp · Member feedback requested · Minutes (2019-05 Fastrack)
Should the rules allow cockpit adjustment of external jetting devices on two cycle cars? Please reply via the letter log system.
Walbran) Two Stroke Standard of Performance Should be Rotax
#26583 from John W (Jack · Taken care of · Minutes (2019-04 Fastrack)
593, Not 494 Thank you for your letter. Please see the responses to letter #26326, March 2019 Fastrack Minutes, and letter #25815, February 2019 Fastrack Minutes.
Formula 500 Exhaust Header Design
#26515 from Eric McRee · Not recommended · Minutes (2019-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. If there is an issue with supply of the current exhaust header or an alternate design is available at a lower cost than the existing header, please submit supporting documentation and the Club Racing Board will consider your request.
Request to allow CBR600F4i and CBR600F engines in F5
#26425 from Bryan Barratt · Not recommended · Minutes (2019-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change because an adequate supply of the approved engines is currently available.
Request to update an existing rule
#26411 from Clint McMahan · Not recommended · Minutes (2019-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The current rule is adequate as written.
Request F500 performance target
#26326 from Jay Novak · Not recommended · Minutes (2019-03 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. Please see the response to letter #25815, February 2019 Fastrack Minutes.
Request for Competition Adjustment in F5
#26016 from H. Cory McLeod · Taken care of · Minutes (2019-02 Fastrack)
Thank you for your letter. Please see the response to letter #25815
Request for Adjustments
#25939 from Russell Strate Jr · Taken care of · Minutes (2019-02 Fastrack)
Thank you for your letter. Please see the response to letter #25815.
Walbran) Request to Reduce Motorcycle Engine Restrictors to
#25815 from John W. (Jack · Not recommended · Minutes (2019-02 Fastrack)
28mm Thank you for your letter. The CRB does not recommend this change.