Quote:
Originally posted by Jgordon
I'm trying to give Steve Wong an idea of the specs of the engine so that he can write a chip for me.
Can anyone tell me the compression ratio of the Mahle 3.4 system on a factory 3.2 crank and rods?
Thanks.
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There are many other factors involved that help determine the measured compression ratio of the motor. You simply can't take what Mahle says as gospel because they are just providing a baseline. You may be considering twin-ignition and head surfacing will be required at the very least, both of which will have an effect on the outcome.
FWIW, the DME domed set is rated at 9.8:1 and the mfi/carb version is rated at 10.3:1. Your professional engine builder should/will measure once the machine work is completed and the motor begins to be assembled.
There are machining methods available to "adjust" the compression ratio if you or your builder are not happy with the measured outcome.
Do a search on my screen name, plenty of info to chew over the past 6-9 months.
Ralph