Re-built our engine a while ago now and set the cam timing with a dial gauge.

The car seems to run well but i am thinking of getting the ignition timing set on a rolling road. Should i get the cam timing set too?

Thanks again

Rupert

If you have a vernier pulley then you might as well while you are there, could be worth a couple of hp even if you are close.

Even if you have timed it up as specified, engines are all a little different and swinging the cam can make a good difference. I think a good rolling road would be able to swing the cam and the spark timing to good effect
Just make sure once its all set that you record and mark the best positions incase you have to take anything apart in the future.

Well that cleared that up.

Emerald have said that they would do ignition only for half the price of a full map run.. so £125. How does that sound? I think they know what they are doing.

NsDev - Have you used wilcox in hinckley. Would they be able to map my Emerald? I guess i should just call them and see how much they charge.

Well that cleared that up.

Emerald have said that they would do ignition only for half the price of a full map run.. so £125. How does that sound? I think they know what they are doing.

NsDev - Have you used wilcox in hinckley. Would they be able to map my Emerald? I guess i should just call them and see how much they charge.

Cam timing has a much bigger effect on twin cam engines, on a single cam engine the overlap is fixed and altering the cam timing hasn't as big an effect as you might think.

surely though if you get it slightly wrong you are trying to recompress the gas which should be flowing out the exhaust valve hense hampering performance or the other way allowing some power to be lost down the exhuast (if it opens to early). This must be a very fine line

Swinging the cam timing on a single cam engine a couple of degrees either way just tends to tilt the power curve a little, retarding tends to give better peak power at expense of lower RPM and vice versa.