[Ron Sutton]

Originally Posted by garickman

Ron, Wegner Motorsports and Comp Cams came up with that profile on their own. I know nothing about building an engine. When I look at that spec card, it might as well be in another language! The only thing I told them was that I was willing to sacrifice some performance for a more street friendly car that can run well on pump gas. So I hate to sound ignorant but I am when it comes to engine building. I don't know if the profile had anything to do with the fact that I am running a Harrop Hurrican ITB intake. The engine will be in the assembly room on Monday. Wegner said he would send me a video of the dyno testing.
You're in good hands. Wegner is a sharp builder & I have loved working with the Comp Cams guys since 1983. They understand lobe shapes better than anyone ... and I have found ... know where to give & take to get the best power.

That is not what they have done here & that's what caught my eye. Running 12° duration split & a 115° lobe center will not build optimum power. It will really spread the power range out ... which is what you asked for ... versus building the highest power numbers in a smaller rpm range like race engines are built to do. We wouldn't build race engines this way, but for a street & track engine, it will be awesome.


I noticed you high lighted the piston to deck +.003. I don't know what that means but I am all ears if you care to give me a quick education.

Most "typical" engine builders run .030" piston to deck clearance. Add a .030" to .040" head gasket to that and you end up with .060"-.070" piston to head clearance ... which is very "safe" ... but doesn't build optimum power, because the squish band is not tight enough.

The "squish band" is the outer area of the bore between the flat top surface of the piston & the flat bottom surface of the head at TDC. .060"-.070" piston to head clearance doesn't make for an optimum squish area. Making that squish band "tighter" or thinner is one trick to optimizing the flame travel during combustion process, & therefore increasing power in high performance & race engines.

Wegner is not a typical engine builder. They have made your piston to deck clearance .003". So that ... plus whatever head gasket thickness ... is your engine's squish area. If the head gasket compresses to .042" ... plus that .003" = .045" squish band.

That's the same as we run, because it's safe. You can run less, but it gets risky & I don't like the risk for the small reward.