Introduction of restrictor plate for Full Preparation engines
#29826 from American Sedan Committee · Recommended to the Board · Minutes (2020-12 Fastrack)
In AS, GCR Section 9.1.6.D.1.c.1.c., add the following:
"Effective March 1, 2021, all cars shall fit a 1/8 inch flat plate, sharp edge orifice, 4 hole restrictor between the Carburetor and
insulator, All air entering the intake must pass through the restrictor plate. The center of the holes of the restrictor plate must be
aligned within 3.0mm of the centers of the carburetor throttle plate holes. The max diameter of the holes is 39.0 mm. unless
specified in the individual car’s specification line. An additional base gasket, as described in section 9.1.6.D.1.c.1.a may be used."
In AS, GCR Section 9.1.6.D.1.f.1.e., add the following:
"Engine RPM limiters must be installed on all vehicles. Maximum engine RPM is 7600. Individual vehicle/engine limits may be
adjusted and would be specified on vehicle specification lines. RPM limits must be demonstrated by the competitor upon request
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of SCCA official."
In AS, GCR Section 9.1.6.D.1.f.2.e., add the following:
"Engine RPM limiters must be installed on all vehicles. Vehicles equipped with Engine Management controllers, ECU, may utilize
the internal ECU RPM limiter. Maximum engine RPM is 7600. Individual vehicle/engine limits may be adjusted and would be
specified on vehicle specification lines. RPM limits must be demonstrated by the competitor upon request of SCCA official."