16:1 vs 15:1 on a 414" sb

[LOnSLO]

Is there much advantage at all going up one full point on an all out combo? Lets keep dynamic compression and such out of this answer. I would like to run an ultra light ring package also. Will that survive big compression?

[Chris Uratchko]

More compression will build torque, and result in better acceleration down track. It's tough to discuss static compression without taking into account dynamic compression.

Typically, the 16:1 is going to need more octane in the fuel than 15:1, and if the engine is a timing hog, as the result of the chamber and piston shape, and size, and plug position etc etc... then if you're not using good enough fuel, you will detonate and hurt parts.

But, in the end if you don't mind spending money on fuel, compression is your friend.

[LOnSLO]

Is a DCR of around 11:1 too high at the 16:1 level? I am running a flat top piston, with small chamber now, with a CR of about 14.95:1. I realize I will have to move to a dome. I guess the real question is, is it worth it over where I am now? My combo works very well, but I would like to improve on it.

[Chris Uratchko]

There's so many variables that I cannot just tell you that it will or will not make improvements down track. Much depends on inlet size(carb), port specs, valve events. You could do all this work and find NOTHING down track... Unless this is a class engine that you're looking to find tha 5 extra hp and you've run out of options this is probably not worth your efforts over 15:1... if it was a new engine going together then fine... but to tear apart and start over for a point??? I'd pass on that one.

[LOnSLO]

OK thanks for the replies Chris 8)