Indiana Open Wheel - View Single Post - RPM limits for the versions of midget racing that run OEM bl

Ray3 (Offline)
#3 4/28/16 5:46 PM

Originally Posted by Daddyz:
All the OEM engines will spin faster than they can breathe- I'm guessing the bottom end will take 7500 or so on any of these without issue. The real issue is spending that much time bouncing on the rev limiter. Oil pump cavitation (or downright breaking gears like the Ecotec is known to) and valve spring fatigue will end up being the big issues with this engine format (shimming an OEM spring is not the same as an aftermarket spring, folks).

I doubt you'll ever see a rod break without a bearing showing oiling issues.

The Badger Midget rules utilizing the 2.4 engines allow dry sump, aftermarket stainless steel valves, aftermarket valve springs, aftermarket connecting rods, aftermarket pistons, etc. Badger Midgets require a non-ported OEM cyl head, an OEM engine block with no lightening, and balanced but not lightened OEM crankshaft (which limits bore and stroke options) allowing the rest to be "developed" utilizing aftermarket components. They do not have a rev limit for any engine. The engines utilizing these parts have reported max RPM at or above 8200 and horsepower of 300+

3 Likes: Daddyz, dirtball, TQ29m