FA MZR 2.0 Engine Specification
#25814 from Club Racing Board · Rule change · TB 19-02 (2019-02 Fastrack)
In FA Table 2, Swift 014-Mazda MZR 2.0, make changes to the notes as follows:
“Sealed engine sourced by Elite Engines Block must be OE Mazda MZR 2.0 liter casting
#LF95, maximum bore 3.455”. Crankshaft must be forged Mazda OE 2 liter marked “fomoco”
DBE8Z31E, maximum stroke 3.270”, minimum rod journal diameter 1.830”, minimum main
journal diameter 2.026”, minimum weight 31.5 lbs. Connecting rods must be magnetic steel;
maximum rod length 5.760”, minimum weight with fasteners 530g. Maximum compression
ratio 13.1:1. Piston minimum weight 320g, maximum dome height from quench area .125”.
Wrist pin minimum diameter .825”, minimum weight 83g. Head must be OE Mazda 2.0 liter
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MZR, part #LF9G-10-090A, casting #6M8G, with minimum chamber volume 40.5cc; ports
must be as cast beginning 1.2” from valve seat insert. Valves must be steel; minimum stem
diameter 5.45mm, maximum head diameter 1.402” (intake) and 1.21” (exhaust). Camshafts
must be Kent DTEC 80 or Mazda Speed PN 1410001I (intake) and PN 141001E (exhaust),
maximum lift .478” (intake) and .446” (exhaust), maximum duration 260 degrees at 1mm lift
(intake) and 256 degrees at 1mm lift (exhaust). Intake manifold must be unmodified Elan
DP02-60-003 or Mazda Speed equivalent Elite USF2015AT, 1.882” maximum bore diameter
at throttle plates. Aluminum spacer must be used between intake manifold and cylinder head
castings; minimum spacer length 2.200”. Exhaust header may be Pro Fab PN P97819 or Pro
Fab PN 100002-01 and must use Pro Fab PN H0503 flange. Collector must be 4-into-1 design.
Maximum primary pipe OD 1.75”, maximum tail pipe OD 2.5”. The CRB reserves the right to
implement a requirement that engines be submitted for dyno testing and sealing at any time.
If implemented, engine performance will be compared to known specimens. Engines will be
denied a seal if they test above 102% of the standard power and torque curve and will be
ineligible for competition until power is corrected and the engine is sealed. The participant will
be responsible for all costs of dyno testing and delivery. This provision is included to dissuade
the competitors from exploiting the rules and expending funds to maximize performance of a
budget minded engine option.”