Beater 2316, Deck height vs. CR |
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Beater 2316, Deck height vs. CR |
groot |
May 2 2020, 01:15 PM
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#1
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
So, finally getting around to building a "beater" engine to develop my race car project (been idle too long). The idea is to build a reliable, decent engine that's not crazy expensive to sort out my car, then put in the expensive engine when the chassis is ready. I will only use race fuel with this engine.
Basic specs are:
Now, the question... should I source 0.220" or larger shims to drop the CR at the expense of deck height? A shim of 0.220" will drop the CR to 10.4:1, but raises the deck height to 0.050" Thoughts? |
HAM Inc |
May 15 2020, 06:59 PM
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#2
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Hey Kevin, glad to hear you get to concentrate on your own racing again. Pretty wild your girl is old enough for a kart now. Time does fly.
The case prep looks good. I don't see any reason that won't work. Are you still using the pump I modified for you? We experimented with zero crankcase venting on the last engine, which had two scavenge stages totaling 60mm's. I hooked up a vacuum gage on the dyno and we were pulling really good vacuum, upwards of 5"+ IIRC. Plenty enough to help make power and run zero venting, but every time we got to around 7K RPM's it would suddenly billow huge amounts of oil smoke out the exhaust. It was still pulling vacuum. I think it was due to severe ring flutter. I have always wondered if gas ported pistons would have solved the problem. I went back to the -12 chimney vent routed to the top of the sump tank with a vent line from the tank to a catch can and the smoking went away. |
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