Compression
06-26-03, 11:45 AM
#2
Senior Member
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The reason I asked - I bought an RX about two months ago, and had a tune put on it by Prather Racing in Topeka, KS. My compression check came back with an 8.5:1. I figured for 98,000 original miles that's not bad, but wasn't sure... which lead to the original question. I figured factory stock 12A's ran about 8.5:1 or maybe 9:1 (which sounds high)...
06-26-03, 03:24 PM
#3
Grey-Bruce Rotorhead
Join Date: Apr 2002
Location: Chesley, Ontario, Canada
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Brand new they were:
Compression ratio 9.4:1
Compression pressure limit 85lbs/sq. inch
Max. permissible difference between chambers 21lbs/sq. inch
Compression ratio 9.4:1
Compression pressure limit 85lbs/sq. inch
Max. permissible difference between chambers 21lbs/sq. inch
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