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On 2 Jan 2002, at 15:04, phil wrote: > I'm not sure I understand... Don't you need a > reference point on the pulley to shoot the stobe at? > Or does the dial bring the TDC mark back when the > strobe is shooting at high RPMs? I've not used one either, but there must be a knob that you turn until the strobe lights up the TDC mark; then you read the advance off the dial around the knob. At any rate they are pretty expensive tools. You can do a pretty good estimate of this by measuring the pulley diameter and calculating the circumference. Divide by 360 and you have the amount of distance along the pulley that each degree occupies. Measure it out and mark it: Voila. You'll still need a regular timing light to do this, but they are very affordable now and they tell you SO MUCH about what's going on that everyone who does their own tune-ups should own one. You'll pay for it in one self-done tune-up. I prefer and recommend the kind with the inductive pickups; I don't know if the old style are even made any more. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe