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
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