Skip Navigation Links Setup New Post Search Forum Home Home Decoder

Original Message

RE: Not much. By Gerry Proctor - 04/27/2004 6:35:51 AM; IP 207.133.188.254 First, the advance and retard marks are on there by virtue of it being an aftermarket performance chain set. Just because you could advance or retard the cam doesn't mean it's a good idea, especailly for a novice. Advancing the cam lowers the rpm point for the engine's torque peak. Retarding the cam raises it. This is due directly to how advancing or retarding the cam changes the intake valve's closing point. It's a tuning issue that very experienced performance builders use to shift the torque curve to enhance the behavior of the car. If the car is loosing traction easily off the line, the cam can be retarded to kill some low-end torque a pick up some rpm on the top end. Or the cam can be advanced to take advantage of traction conditions to improve a 60-foot time but with a reduction in top-end power. But the difference is pretty insignificant with a cam with very short duration. And just so this doesn't get confused...these alternative timing marks have little to nothing to do with degreeing a cam unless the cam is precisely two degrees off one way or the other.

This thread, so far...

Skip Navigation Links.  Another 390 cam timing question -- Anthony, 04/26/2004  RE: Another 390 cam timing question -- Gerry Proctor, 04/26/2004  RE: Another 390 cam timing question -- Anthony, 04/26/2004 RE: Not much. -- Gerry Proctor, 04/27/2004  RE: Not much. -- Barry B, 04/27/2004  RE: Not much. -- Barry McLarty, 04/28/2004  RE: That's only an issue in longer-duration cams -- Gerry Proctor, 04/28/2004

Post A Response

Subcribe

Name: Email Address: Subject: Post: Upload Image: Human Check:   Enter the code 2025203348 in the box