Quick question on advancing/retarding cam
Quick question on advancing/retarding cam I know that properly degreeing the cam (as apposed to just installing it dot to dot) will provide the best performance for the given application. Just not sure how that applies to the ground in advance/retard the cam already has.
Say you have a 112 LSA cam with +2* of advance ground in (thus 110 ICL). If for example you retard that cam 1*, what changes as far as the engine sees?
Will it be a 112+1 (111 ICL) or since the 2* of advance are ground in permanently, it will always be a +2 so in this example retarding the cam 1* will turn it into a 113+2 (111 ICL)?
Say you have a 112 LSA cam with +2* of advance ground in (thus 110 ICL). If for example you retard that cam 1*, what changes as far as the engine sees?
Will it be a 112+1 (111 ICL) or since the 2* of advance are ground in permanently, it will always be a +2 so in this example retarding the cam 1* will turn it into a 113+2 (111 ICL)?
The latest Hot Rod mag March 2014 (not sure) had a really good article on advancing/retarding the cam for the best overall performance with a compression gauge. Regardless of what was advertized on the cam or what you think may be right. They set up No. one cylinder with rockers, valves, etc and cranked the motor (using the starter) and measured the compression. They then retarded the cam 2 degrees and repeated the test. Then advance the cam 2 degrees and repeated. Which ever way they went they kept going (advance or retarding) until they got the most compression. If I find the article I will reply back.
I know that properly degreeing the cam (as apposed to just installing it dot to dot) will provide the best performance for the given application. Just not sure how that applies to the ground in advance/retard the cam already has.
Say you have a 112 LSA cam with +2* of advance ground in (thus 110 ICL). If for example you retard that cam 1*, what changes as far as the engine sees?
Will it be a 112+1 (111 ICL) or since the 2* of advance are ground in permanently, it will always be a +2 so in this example retarding the cam 1* will turn it into a 113+2 (111 ICL)?
Say you have a 112 LSA cam with +2* of advance ground in (thus 110 ICL). If for example you retard that cam 1*, what changes as far as the engine sees?
Will it be a 112+1 (111 ICL) or since the 2* of advance are ground in permanently, it will always be a +2 so in this example retarding the cam 1* will turn it into a 113+2 (111 ICL)?
Just following up... Diet is correct. Additionally maximizing cylinder pressure or dynamic compression; the technique that Hot Rod mag March 2014 talked about; optimizes camshaft position for any engine combination.