cam timing clarification

[michaedo]

Howdy folks,
Needing a little guidance here as far as cam timing.
Cam in question is cam techniques, f306/290/6.
4* advance built in
C/L for intake is 102*
Seein' as how I need the exercise, I used the flywheel
method of degreeing. (up, down, up, down) good for the
abs.
At 2.5* per tooth, 40 teeth gives me 102*.
That is exactly what I got on the flywheel at the c/l point.
Question is: ...the 4* advance? Is that what put the
c/l at 102*? Or should the 4* be added to the 102*.
Otherwise all is happening right when it should be.
Thanks,
Don.

[GTJIM]

Good question - the usual way to grind a cam with 4 degrees advance would be to shift the whole profile with respect to the cam dowel. So if you install that cam 'straight up' the specs would measure out at 4 degrees advanced - i.e. early.

Once the cam is installed then the centre line should be at 98 degrees by measurement - I would think.

Best ask Cam Techniques to be sure! They may have factored the advance into the actual installed position ....

[jeff denton]

Take that 2.5* per tooth figure one decimal further, OK? Call it 2.57*. See if that makes a little difference.

[wrench459]

Originally Posted by michaedo Howdy folks, Needing a little guidance here as far as cam timing. Cam in question is cam techniques, f306/290/6. 4* advance built in C/L for intake is 102* Seein' as how I need the exercise, I used the flywheel method of degreeing. (up, down, up, down) good for the abs. At 2.5* per tooth, 40 teeth gives me 102*. That is exactly what I got on the flywheel at the c/l point. Question is: ...the 4* advance? Is that what put the c/l at 102*? Or should the 4* be added to the 102*. Otherwise all is happening right when it should be. Thanks, Don.

Thats a great street cam

You'll also need a compression ratio around the 10.5:1 to make it work.

[Hiro]

Here are some Cam Techniques profiles if this can help you,
Hiro.

http://www.opelgt.com/forums/139401-post4.html

[michaedo]

Will call Cam Tech Monday.
Just as well, too hot today to
bother with trying to get anything
done.
Thanks for the response everyone.
Don.

[RallyBob]

Originally Posted by michaedo Will call Cam Tech Monday. Just as well, too hot today to bother with trying to get anything done. Thanks for the response everyone. Don.

I just called Cam Techniques Friday....they're closed until the 26th of June, so you'll have to wait.