The program doesn?t recommend much of a change in cam timing but a big change in LC (108 to 116 in one case). With this motor the CR was 10.7 to 1. and the chamber was a standard wedge. According to the program the motor picks up about 30+ HP with LC change.
I could see where going from the 108 to 116 would give you a hp increase as it would up the dynamic compression even more and with the 10.7 to 1 static it would be a lot more compression. Now you would also have to have the right gas to let you get away with that.
On the street putting the 108 in the 10.7 motor would help bleed off some of the compression and might let the motor live on pump gas. Of course you now might also be giving up HP.
If you download the:
Dynamic Compression Ratio
Information and Calculator Download Page
on this site:
http://cochise.uia.net/pkelley2/ It will let you figure the dynamic compression on a motor with different cams, strokes, etc..
I like it, but I'm not smart enough to know if all of the guy's math is accurate or not.
I use to think compression ratio was compression ratio, but now I can see that the cam and some other varibles are going to really come into the picture and it is not as easy as saying "I want to build a 12 to 1 motor". The more you learn the more you find out there is to learn
.
c ya, Sum