[Fot] timing issues

[Bill Babcock]

I agree, I always use centerlines. If for no other reason than it's  
easier.  I always degree the cam anyway to see what I've got. I go the  
extra mile and do it for each cylinder so I can detect any grinding  
errors. I once sent a cam back for a substantial error on the #4  
cylinder.

Doesn't take that long, especially if I have the wife reading the dial  
indicator as I advance the motor.  I also always use an adjustable  
sprocket so I can tweak the advance. Of course having done that I  
haven't stuck a motor on the dyno in years, so it's a waste of money.

On Jun 7, 2009, at 1:16 PM, Larry Young wrote:

> I may be in the minority here, but I don't use the 0.050 numbers  
> when I set up a cam.  I set it strictly using intake lobe  
> centerline, which is what Tony is suggesting. The reason for this is  
> that you can measure the centerline more accurately.  Rather than  
> just measuring at 0.050 on each side, I suggest you measure the open  
> and closing angles at lifts of 0.200, 0.250 and 0.300 or something  
> similar.  This will give 6 numbers that when averaged will give a  
> very accurate centerline number.  Probably overkill when you can  
> only get within + or - 2 degrees, but you will know what you've  
> got.  And yes, always turn the crank in the direction the motor  
> turns, so you have tension on the chain.
> Larry Young