Quote:
Originally Posted by Tim Ayers
As I've mentioned before, I have learned quite a bit having Ronnie build my engine. I was quite surprised to hear that the Potvin cam, as marked, would have been at 119 degrees v. 110 as stated.
Just stabbing a cam in and leaving it at 119 would created a horrible performing engine.
Being meticulous with what he does, Ronnie got it timed to exactly 110 degrees and plugged and re-drilled the timing gear so it is dead nuts right.
The reason I mention this is I was left wondering how many cams are actually installed without being degreed and then a owner is disappointed and blames the cam.
Sometimes it is a poor cam choice, but I've wondered how many times it was just an incorrectly timed school that performed poorly.
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I presume you are talking about lobe centerline. This can be diddled around.
The lobe separation angle can NOT be moved after the cam is rough ground.
The tag will indicate lobe separation angle MOST of the time.
The lobe center line is usually determined by the application of the engine.
A Potvin 425 has a lobe separation angle of 110.