Wishmaster

how come some cam companies put/add between 1 to 4 degrees of advance into their cams? what does that do? but then even with a built in advance some people retard the cam after installing it?
why not just get the came in the first place with no advance.

reason im asking is because my cam has about a 1.5 biult in advance but when someone ran it for me in DD ..they ran it retarded 2* and came up with over 500 hp/tq

Im debating on putting it in like it was designed to be or putting it in 2 * retard to get those numbers

89TramsAmGTA

From what I understand the cam companies add 4 degrees advance because most people buy too big of a cam for their application. This will save them a little because it adds low end torque.

I ran my my set up on Desk Top Dyno(DynoSim) and came up with the same numbers you did with over 500hp. I would retard the cam up to 4 degrees and the horsepower numbers kept rising with very little low end loss.

So I asked the question on this forum as you are. Bret Baur answered and said I should install the cam as suggested by CompCams. They suggested it to be installed on a 109ICL which is 4 degrees advanced. I cheated a little and installed it at 110ICL which is 3 degrees advanced.

The cams intake and exhaust lobes are designed around the built in advance. You can get a custom cam and it can be installed without advance ro retard.

Wishmaster

you did? and your still above 400 to the wheels which is good..thats what I want....
yeah somebody told me that I wouldnt be about to tell the 2* one way or the other anyways. I adjusted the cam to be about 1* retard

Mine is a custom cam...so you think I should install it the way its suppose to be?

or just leave it where I have it?

does changing the advance or retard of a cam change the LSA? I know its changes the ICL and ECL but what about the LSA?

thanks

89TramsAmGTA

The hp numbers were on Desk Top Dyno. As to the real rwhp numbers that is yet to be determined.

They may be right as to the seat of the pants way of telling power as to whether the cam is off 1 or 2 degrees. However on the dyno I would imagine a trend one way or the other. For one thing your IVC will be changing along with your dynamic compression and the other valve events.

Plus or minus 2 degrees is a lot in my mind. If you have a suggested 40 IVC and you advance it 2 degrees than it becomes 38 degrees. Retarding it two degrees becomes 42 degrees. That is a swing of 4 degrees from 38 to 42 degrees. That will effect your dynamic compress quite abit.

Wishmaster

well crap..then what should I do?

Rice Killer87

Install it the way whoever ground the cam says to after telling them your expectations.