RE: shovelhead cylinder pressure

72 Harley-Davidson FL 1200 Electra Glide discussion forum:


RE: shovelhead cylinder pressure

RE: shovelhead cylinder pressure 
Ken M said 2011-04-08 15:33 
 
The stock compression ratio was 8.0:1. 8 atmospheres = 117.6 PSI. That´s assuming no losses through the rings or valves. A fresh top end would read about that high. 
 
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