What was the compression ratio for the stock 12A out of the factory? Thanks!

 

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)...

 

Brand new they were:

Compression ratio 9.4:1

Compression pressure limit 85lbs/sq. inch

Max. permissible difference between chambers 21lbs/sq. inch

 

Cool - thanks!