Engine Rules Adjusted for CSR

February 23, 2005

A Technical Service Bulletin (Acrobat file) will appear in the April edition of SCCA's FasTrack with the changes effective March 1, 2005.

CSR engine specification listed in the Sports Racer Category of the 2005 GCR have been changed, primarily to allow fuel injection on almost all choices, and to make competitive adjustments to minimum weights.

CSR engine choices remain vast with twenty types of alternatives listed.

The changes are noted in red in the table below:

Fuel Injection allowed at 25 lb. penalty as shown.

Engine Type or Specific Engine	Max Displ. (cc)	Head Type	Max Valves per Cyl.	Carb or Fuel Injection	Carbed Weight (lbs) w/ driver	FI Weight (lbs) w/ driver	Notes
4 cycle Motorcycle -based	1310 1300	UR	4	UR	1150 1100	1175 1125
4 cycle Motorcycle -based	1400	UR	4	UR	1150	1175	new listing
4 cycle	1450	OHC Cross-flow	2	Carbs only UR	1200	NA 1225
4 cycle Motorcycle -based	1615	UR	4	42mm venturis or restrictors	1250 1200	1275 1225
Toyota 4AGE- series DOHC	1615	Cross-flow	4	Carbs only with 42mm venturis	1300	NA 1325	see rules
VW 1.8L	1835	UR	2	2 UR Carbs or FI with 37mm venturis restrictors	1260 1200	1285 1225	see rules
Mazda 12A Rotary	N/A	Bridge Port	-	One IDA 48mm w/ 34mm venturi, or Fuel Injection w/ 34mm restrictors per port	1300	NA 1325
13 other engine choices							No change - see rules
UR = Unrestricted FI = Fuel Injection Strike through letters indicate text that was removed. Black letters indicates text that was added.

Read forum discussion on this topic.