Posted by Indiana Ken on August 12, 2015 at 08:16:03 from (67.163.32.18):
In Reply to: Compression Ratio posted by Moondoggie on August 12, 2015 at 07:28:59:
Quoting Removed, click Modern View to see
Compression ratio (CR) is defined as; the volume at bottom dead center (BDC) divided by the volume at top dead center (TDC). CR is based on volumes and does not translate directly to pressure, since compression does not begin until the valves are closed. For this reason, refer to the manual for the engine cranking compression pressure in PSI.
Note: At BDC the total volume is the cylinder volume ((3.14 x bore x bore / 4) x stroke), or swept volume (Vs) + the combustion chamber volume or clearance volume (Vc).
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