From BMARA
Sun Prairie, WiI — (January 28, 2015) — Officials of the Badger Midget Auto Racing Association (BMARA), recently announced 2015 season rule changes, affecting open wheel racing’s oldest active sanctioning organization. The following will clarify the questions regarding the “new engine rules package:
All engines must be normally aspirated, internal combustion, four cycle, in-line, 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 2.4 liters (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.
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. Connecting rods, rod bolts, pistons, pins, and piston rings may be replaced with aftermarket products. Titanium products are not allowed.
The OEM cylinder head maybe machined or strengthened for longevity. Porting of the cylinder head including intake matching is not allowed. Machining, grinding, sanding, or etching of the intake and/or exhaust ports are strictly prohibited.
Camshafts, valve springs, valve spring retainers, keepers, and fowler 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.
The fuel injection system is open to either mechanical or electronic. Only the MSD ignition, the Electromotive Tech-S, and Electromotive XDI systems will be allowed. All other engines must be pre-approved by Badger before allowed in competition.
All current purpose built “National Type” midget racing engines are still allowed to compete, but with restrictions.