Originally Posted by asdasc
I am FINALLY getting around to putting my new engine together and was doing some light reading to refresh my memory on things and came across this. I didn't realise (or remember) that with OGTS 2.0L pistons the starting compression is up to 9.4! I had my machine guy deck the block to bring the pistons up to +.005 over deck height.
I am running a stock 2.0L head with a mild Hydr cam. I was blessed to get a 'signature series' Jeff Denton modified timing gear, so I am not worried about getting it timed.
My only worry now is too much compression (is there such a thing?!). Will it be a problem for a street motor?
Thanks,
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Now is the perfect time to relieve the valve shrouding (ala Rally Bob) which will increase your combustion chamber cc's and thereby slighty reduce your compression ratio. You will most likely need to run 91-93 octane gas but that is streetable. You can also use a heavier dist. advance spring which will slow down your mechanical advance and allow a slower transition to full advance, and spread the rpm range to keep spark knock down.