Increasing Power Output On A 46L Ford Motor Combustion Chamber
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Another significant difference between the PI and Non-PI heads was the combustion chamber volume. The Non-PI motors relied on a combination of 51cc combustion chambers and 11cc dish pistons to produce a static compression ratio of 9.3:1. The PI motors combined 42cc chambers with 17cc dish pistons to produce 9.7:1. Combining the small PI chambers with small Non-PI dished pistons resulted in a static compression ratio of 10.3:1 View Related Article
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