Your machinist is right have a look at the description of how to do it
on this web site.
http://www.webcamshafts.com/degreeing.html
http://www.webcamshafts.com/cam_glossary.html
Or go to almost any cam manufacturers web site and they should have a
tech section showing how to degree your cam. I personally sit my laptop
on a table next to the engine stand and plot the lift every 2 degrees
into an excell spread sheet then I end up with a cam timing chart that
looks just like the cam makers. I also plot the lift at the lobe and the
valve this will help you spot any out of spec rocker arms. I had 2
rockers that had significantly lower ratios than the others so I
replaced them it made 0.012" difference at the valve it also changes the
timing at the valve when the rockers don't match.
Doug Hamilton
1960 Triumph TR3
1963 Fiat Cabriolet
>Date: Mon, 12 May 2003 19:07:14 -0400
>From: Mitchel Seff <ms6453@optonline.net>
>Subject: cam degreeing
>
>Hi all,
> I just spoke to the machine shop and explained how I set the cam. He
>said it is not correct. I set the cam to the suggested 113 degree at
>full intake at the front of the ramp where it first hits maxinum lift..
>He said I should have used the same method as finding TDC. So actually
>if the lobe sustains full intake for an additional 8 degrees I should
>find the center of the lift duration.
>Any comments.
>
>- --
>Mitch Seff
>Oceanside, N.Y.
>75 TR6
>http://www.angelfire.com/ny4/triumph5/
/// triumphs@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|