Quote:
Originally Posted by Don M
A late closing intake valve will reduce compression ratio as well. Your static 11 to 1 can drop below that ratio with a late intake close while remaining technically an 11 to 1 engine. A trick, if you will.
Don~
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I dunno,
Compression ratio is a mechanical ration and to me has nothing to do with valve timing or lift. The volume of the cylinder with the piston at TDC, divided by the volume of the cylinder with the piston at BDC is compression ratio.
BMEP changes greatly with valve timimg / lift. I believe you are referring to BMEP.