Think I'll go watch tonite, heres some Dwarf Car specs..
2 Weight
2.1 Class Weight Rules
No car shall weigh less than 1,000 pounds without driver.
5.1 Block
Motorcycle engines only. No snowmobile or other special application engines. 1250cc is the maximum
allowable displacement.
1250 cc maximum, 4 cycle 4 cylinders maximum.
Must be a regular production (minimum 500 units per year)
Engines must have stock bore and stroke with no more then 1 mil. over bore over the original factory
specifications for the engine manufacturer. OEM bore and stroke only. (The 1 mil. over bore is intended for
cleanup only, not aftermarket pistons.) Engines will be checked with a bore and stroke gauge and must not
exceed manufacturers original cc's for that motor.
5.2 Crankshaft
5.3 Connecting Rods
5.4 Pistons
5.5 Heads
Unmodified OEM cylinder heads only.
5.6 Springs
5.7 Valves
5.8 Camshaft
Camshafts must have stock lift and duration, adjustable cam sprockets are allowed.
5.9 Rockers
5.10 Oil Pan
5.11 Intake
5.12 Air Cleaner
5.13 Fuel Delivery System
This rule applies to fuel injected motors: OEM fuel injection only. Fuel injection may not be modified in any
way from its original OEM specifications. OEM ignition systems only. No after market fuel injection allowed.
After market boxes that adjust Fuel Curve, Timing and RPM only, are allowed. The only boxes that are
approved are the Dynojet 2, 3, and 3R.The Dyno jet 3 with the USB is allowed with no external modules
plugged in. Any boxes of this type, other than those specified, must be pre-approved by Pit Steward, 30 days
prior to the event. Any car that is discovered to have any other electronic devices other that those outlined
above, or who has made any modifications to these allowed boxes, will be disqualified.
Must be naturally aspirated.
5.14 Ignition
5.15 Starter
Must a have working starter.
5.16 Cooling System
Engine must be cooled by original intent. May use extra fans or oil cooler.
Water only to be used for coolant. Use of antifreeze results in disqualification. Water Wetter or equivalent ok.
6 Drivetrain
6.1 Bellhousing
6.2 Clutch
Must a have working clutch.
6.3 Transmission
Must have a working transmission.
No quick change in the entire drive system, meaning from motor.
6.4 Flywheel
6.5 Driveshaft
Must use steel drive shaft from motor to automotive rear end.
Drive shaft must have a minimum of 3 360-degree loops. One near each end, one in center. Must be
fabricated from a minimum 3/16" x 1-112" steel bar, or 1.00" x .065 steel tubing.
Drivelines must be painted white.
6.6 Rear End
6.7 Miscellaneous
7 Exhaust
7.1 Manifold/Header
7.2 Exhaust System
Exhaust and headers must be installed so as not to detract from stock appearing hood, with the exception of side panels.
7.3 Mufflers
Mufflers are mandatory.
Strict 95dba @ 100’.
Petaluma Speedway - Home
2 Weight
2.1 Class Weight Rules
No car shall weigh less than 1,000 pounds without driver.
5.1 Block
Motorcycle engines only. No snowmobile or other special application engines. 1250cc is the maximum
allowable displacement.
1250 cc maximum, 4 cycle 4 cylinders maximum.
Must be a regular production (minimum 500 units per year)
Engines must have stock bore and stroke with no more then 1 mil. over bore over the original factory
specifications for the engine manufacturer. OEM bore and stroke only. (The 1 mil. over bore is intended for
cleanup only, not aftermarket pistons.) Engines will be checked with a bore and stroke gauge and must not
exceed manufacturers original cc's for that motor.
5.2 Crankshaft
5.3 Connecting Rods
5.4 Pistons
5.5 Heads
Unmodified OEM cylinder heads only.
5.6 Springs
5.7 Valves
5.8 Camshaft
Camshafts must have stock lift and duration, adjustable cam sprockets are allowed.
5.9 Rockers
5.10 Oil Pan
5.11 Intake
5.12 Air Cleaner
5.13 Fuel Delivery System
This rule applies to fuel injected motors: OEM fuel injection only. Fuel injection may not be modified in any
way from its original OEM specifications. OEM ignition systems only. No after market fuel injection allowed.
After market boxes that adjust Fuel Curve, Timing and RPM only, are allowed. The only boxes that are
approved are the Dynojet 2, 3, and 3R.The Dyno jet 3 with the USB is allowed with no external modules
plugged in. Any boxes of this type, other than those specified, must be pre-approved by Pit Steward, 30 days
prior to the event. Any car that is discovered to have any other electronic devices other that those outlined
above, or who has made any modifications to these allowed boxes, will be disqualified.
Must be naturally aspirated.
5.14 Ignition
5.15 Starter
Must a have working starter.
5.16 Cooling System
Engine must be cooled by original intent. May use extra fans or oil cooler.
Water only to be used for coolant. Use of antifreeze results in disqualification. Water Wetter or equivalent ok.
6 Drivetrain
6.1 Bellhousing
6.2 Clutch
Must a have working clutch.
6.3 Transmission
Must have a working transmission.
No quick change in the entire drive system, meaning from motor.
6.4 Flywheel
6.5 Driveshaft
Must use steel drive shaft from motor to automotive rear end.
Drive shaft must have a minimum of 3 360-degree loops. One near each end, one in center. Must be
fabricated from a minimum 3/16" x 1-112" steel bar, or 1.00" x .065 steel tubing.
Drivelines must be painted white.
6.6 Rear End
6.7 Miscellaneous
7 Exhaust
7.1 Manifold/Header
7.2 Exhaust System
Exhaust and headers must be installed so as not to detract from stock appearing hood, with the exception of side panels.
7.3 Mufflers
Mufflers are mandatory.
Strict 95dba @ 100’.
Petaluma Speedway - Home
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