<VV> cam one tooth off

[djtcz at comcast.net]

snipped and bottom posted 


-------------- Original message -------------- 
From: virtualvairs-request at corvair.org 

> Stu, 
> 
> IMHO, generally, you want the cam gear to be advanced rather than retarded. 
> By advanced, the cam lobes come up ahead of where they are supposed to be 
> slightly, rather than slightly behind where they are supposed to be. If the 
> crank (rotates CCW from rear of engine) is at TDC, remembering the cam turns 
> the opposite way or CW when you are at rear of engine, then you move the cam 
> gear toward the direction of rotation. REMEMBER you are looking at "front" 
> of engine (bellhousing end) where cam gear and crank gear mesh, so 
> everything is reversed. From this perspective, crank turns CW and cam turns 
> CCW. Put the little ? symbol to right of tooth/line rather than to left. 
> 
> Someone please check my comments. 
> 
> Chuck S 
> BBRT 

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If the crank gear has 28 teeth (guess, from pictures) each tooth is worth 360/28 or about 13 crank  degrees.
A max change of  +/-6 degrees in increments of ~2 crank degrees may be a more typical cam "tuning" limit

http://store.summitracing.com/egnsearch.asp?N=400043+300331+115&autoview=sku

I consider cam installation on most any engine too risky without some kind of timing verification. A cam as deep in the engine as a Corvair double so.

Degreeing Need not be expensive, as Degree wheels can be downloaded for free, and Isky's positive stop method can be done from spare bolts and bits, even on an assembled engine.
http://www.iskycams.com/degreeing.php

Dan Timberlake 
Westford, Massachusetts, USA