Badger Rules/Powri:
A. All engines must be inline, normally aspirated, internal combustion, four cycle, reciprocating piston type,
incorporating a maximum of four (4) cylinders. Engines must be a production engine from a passenger car and
reasonably available in the United States. These engines are allowed a maximum displacement of (146.457 CID)
and have no more than four (4) valves per cylinder. All production passenger car engines must use the OEM
block, OEM cylinder head, and OEM crankshaft combination from the same manufacturer.
B. The OEM block maybe machined or strengthened for longevity. Blocking and/or opening lubrication and coolant
passages will be allowed. The crankshaft may be balanced, and oil passages may be chamfered. Lightening,
chamfering or “knife edging” the crankshaft counterweights beyond minimal material removal for balancing is
NOT permitted. NO grinding on the crankshaft journals of any kind. Connecting rods, rod bolts, pistons, pins, and
piston rings may be replaced with aftermarket products. Titanium products are NOT allowed.
C. The OEM cylinder head maybe machined or strengthened for longevity. Porting of the cylinder head including
intake matching is NOT ALLOWED. Cylinder head ports must remain stock as cast. Machining, grinding,
sanding, or etching of the intake and/or exhaust ports are STRICTLY PROHIBITED. Camshafts, valve springs,
valve spring retainers, keepers, followers or rockers maybe replaced with aftermarket products. All timing
components such as cam gears, sprockets, timing chains, and timing belts maybe replaced with aftermarket
products. Titanium products are NOT allowed except for valve spring retainers.
D. The fuel injection system is open to either mechanical or electronic. Variable valve timing (VVT, VTEC, etc) is
allowed on cars using the stock OEM intake manifold and throttle body. Cars utilizing any fuel injection system
other than the stock OEM intake manifold and throttle body must have variable valve timing disabled or in a fixed
position.
Southern State Midgets:
GM Ecotec 2.4L (LE5), or 2.2L (L61) - 88mm Bore X 98mm Stroke / 86mm Bore X 94.6mm Stoke
Honda 2.4 L (K24A1-A2) - 87mm Bore X 99mm Stroke
Chrysler World Engine 2.4L - 87.5 Bore X 101mm Stroke
Toyota 2.4L (2AZ-FE) - 88.5mm Bore X 96mm Stroke
Ford/Mazda Duratec 2.3L (23 I-4/L3) - 87.5mm Bore X 94mm Stroke
GM Quad 4 2.3L and 2.4L - 90mm Bore X 94mm Stroke
Ford 2.0L Focus/Scream Pre-2004 (see notes) - 87.5mm Bore X 83.1 Stroke
Engines must remain in stock displacement. Allowances are for cleanup.
Maximum displacement for 2.4L Engines: 2.4110 Liters (147.15 CID)
Maximum displacement for 2.3L Engines: 2.2868 Liters (139.55 CID)
Maximum displacement for 2.2L Engines: 2.2237 Liters (135.70 CID)
Maximum displacement for 2.0L Engines: 2.0115 Liters (122.75 CID)
Must use original manufacturers (OEM) engine block, OEM cylinder head, OEM crankshaft, Aftermarket FLATTOP pistons ok, (must have stock pin location), Any OEM camshafts from the engine make/group with stock duration and lift ok (must have stock OEM #/stamp), OEM Rocker Arms (rockers cannot have any alterations to any locking mechanism, they must remain stock), and OEM valves. The same combination that was standard out of the factory when new in the passenger vehicle must be used. (*)SEE NOTE
Absolutely no head swapping, Example: 2.4 LE5 must have a 2.4 LE5 head. Each part must be from the same exact type engine, and manufactured for that particular engine.
Alterations to the OEM block and OEM cylinder head are limited to removing material for the express purpose of fitting the engine in the chassis only. You will be allowed .010 clean-up on the head for warpage purposes only. Absolutely NO decking/cutting of block except for clean-up, (CLARIFY: Clean up is ok but the Piston must not protrude OUTSIDE of "BARE" cylinder deck). Blocking and/or opening lubrication and coolant passages will be allowed. The crankshaft may be balanced, and oil passages may be chamfered. Lightening the crankshaft beyond minimal material removal for balancing is NOT permitted. Adding, removing, lightening, chamfering or “knife edging” crankshaft counterweights is strictly prohibited.
Connecting rods, FLAT TOP pistons and valve springs, valve spring retainers and keepers may be replaced with aftermarket products, however valves, valve springs, valve spring retainers, keepers, and connecting rods made of titanium are NOT allowed.
Aftermarket PISTONS AND RODS must remain stock length and stock piston pin location. Piston pin must be of ferrous material, titanium or other exotic alloys are Not Allowed.
Addmement 1a. Piston must be 3 ring design.
Aftermarket cam gears, sprockets, timing chains, timing belts may be used. All other STOCK OEM cylinder head components must be used. Welding on the cylinder head will NOT be permitted. Porting of the cylinder head including intake matching is NOT ALLOWED,
see (*).
Machining, grinding, sanding, or etching of the intake and/or exhaust ports is STRICTLY PROHIBITED. No altering of the shape and/or size of the intake or exhaust ports from OEM specs is allowed.
Fuel Injection: Constant Flow Mechanical or EFI with plenum or individual runner intake. Any programmable ignition/fuel injection systems are allowed, but must be readily available and have supported software. No carburetors.
(*)Notes: We are aware that there are many “built up” 2.0 Ford Focus engines out there. While we do not expect Focus engine owners to “fix/replace” any possible changes that have been done to the engine, we do remind that the Focus/SCREAM engine can not utilize any other head except the 2000-2004 Focus factory head. No aftermarket heads of any kind. Porting and polishing of Ztec head is ok.
Oil System: Wet Sump or Dry Sump
Engine Management Systems may use the following sensors: MAP (manifold absolute pressure), TPS (throttle position sensor), Crank, Cam, Water temp., Oil temp., Oil Pressure, Oxygen sensor, Fuel Pressure, IAC (idle air control, MAT (manifold air temp.), and EGT.
The use of Wheel Speed Sensors with management systems is prohibited.
Traction Control is illegal.
Any timing curve is OK, may be switchable with the MSD 6214 Midget Ignition System.
Counter Balance Shafts can be deleted.
No Glycol based coolant.
IMRA/MWTM....USAC
GM Ecotec 2.2L (L61) or 2.4L (LE5)
Maximum displacement 2.4110 Liters/147.15 CID (Bore 3.466 Stroke 3.861) for the 2.4l ecotec. The 2.2l specs are listed further below.
Constant Flow Mechanical or EFI with plenum or individual runner intake permitted
Restrictor may be required, as determined by Technical Director
Honda 2.4 L (K24 – A1, A2)
Maximum displacement 2.4110 Liters (147.15 CID) (Bore 3.425 Stroke 3.897)
Constant Flow Mechanical or EFI with plenum or individual runner intake permitted
Restrictor may be required, as determined by Technical Director
Ford Focus Zetec 2.0L
Maximum displacement 2.0115 Liters (122.75 CID) (Bore 3.444 Stroke 3.700)
Constant Flow Mechanical or EFI with plenum or individual runner intake permitted
Aftermarket camshafts are permitted to enable Focus to compete with 2.4L engines
No Restrictor required
(other production-based engines accepted by the imra organization
Chrysler World Engine 2.4L - 87.5 Bore X 101mm Stroke
Toyota 2.4L (2AZ-FE) - 88.5mm Bore X 96mm Stroke
Ford/Mazda Duratec 2.3L (23 I-4/L3) - 87.5mm Bore X 94mm Stroke
GM Quad 4 2.3L and 2.4L - 90mm Bore X 94mm Stroke
Engines must remain in stock displacement. Allowances are for cleanup.
Maximum displacement for 2.4L Engines: 2.4110 Liters (147.15 CID)
Maximum displacement for 2.3L Engines: 2.2868 Liters (139.55 CID)
Maximum displacement for 2.2L Engines: 2.2237 Liters (135.70 CID)
Maximum displacement for 2.0L Engines: 2.0115 Liters (122.75 CID)
Must use original manufacturers OEM cylinder head, OEM crankshaft, OEM pistons, OEM camshafts with stock duration and lift (exception – Ford Focus), OEM Rocker Arms (rockers cannot have any alterations to any locking mechanism, they must remain stock), and OEM valves - must be from the same series/model engine, and manufactured for that particular engine. For example: 2.4 LE5 Ecotec must have a 2.4 LE5 head and other components
Alterations to the OEM block and OEM cylinder head are limited to removing material for the express purpose of fitting the engine in the chassis only. Blocking and/or opening lubrication and coolant passages will be allowed. Adding, removing, lightening, chamfering or “knife edging” crankshaft counterweights is strictly prohibited. Heads can be decked for trueing – excess decking resulting in compression ratios outside of those found in similar engines not permitted.
Counter Balance Shafts can be deleted.
Connecting rods (stock length only), and valve springs, valve spring retainers and keepers may be replaced with aftermarket products. Aftermarket cam gears, sprockets, timing chains, timing belts may be used. No titanium engine parts are allowed. All other STOCK OEM cylinder head components must be used. Welding on the cylinder head will NOT be permitted. Porting of the cylinder head including intake matching is NOT ALLOWED. Machining, grinding, sanding, or etching of the intake and/or exhaust ports is STRICTLY PROHIBITED. No altering of the shape and/or size of the intake or exhaust ports from OEM specs is allowed.
USAC IMRA will utilize the Katech Whistler machine to detect modifications to combustion chambers, and reserves the right to require disassembly and inspection of engines falling outside of the range exhibited by similar engines to determine compliance with all rules listed above.
Anyone to be found outside of the engine guidelines for all engines will be subject to suspension and or fines by the USAC IMRA.
Oil System: Wet Sump or Dry Sump permitted
Ignition System:
A. Electronics that provide traction control are prohibited. All electronic components may be inspected, sealed, or confiscated by Technical Director at any time. The maximum penalty for utilizing traction control is a one year suspension from competition and loss of all points earned for the season.
B. The use of electronic logic processors to control any function of the race car, and/or any system for gathering continuous data from any function of the race car is strictly prohibited.
C. Tachometer only item approved for use to collect/record data
D. Electronic ignition system may only be used to control; coil(s), trigger(s), spark curve(s) and RPM limits.
E. VVT, VTEC, i-VCT, Etc.: may be utilized or locked out