What do you expect to see when timing an engine? It seems like the timing marks on mine jump around approximately 4 degrees. That is, 1 mark above where it's supposed to be, and 1 mark below. Each mark is 2 degrees. I expect the timing to be dead on each time. But, it seems to jump around a little. And it's hard to see; I have to watch out for the fan; etc. Am I expecting too much? When you do yours, is it dead nuts on each time? Or, does it jump around a little?
(It's a newly rebuilt SBC with a tight timing chain, and a distributor that was supposed to have been rebuilt.)
What do you expect to see when timing an engine? It seems like the timing marks on mine jump around approximately 4 degrees. That is, 1 mark above where it's supposed to be, and 1 mark below. Each mark is 2 degrees. I expect the timing to be dead on each time. But, it seems to jump around a little. And it's hard to see; I have to watch out for the fan; etc. Am I expecting too much? When you do yours, is it dead nuts on each time? Or, does it jump around a little?
(It's a newly rebuilt SBC with a tight timing chain, and a distributor that was supposed to have been rebuilt.)
Location: So Cal- - Defend your ideas with facts. Not personal attacks.
Kind'a hard to see your connections from here in So Cal.
Well could be some problem with the dizzy in the plates, springs, weights. Condition of cap and rotor? Try using plug wire on #6 and see if better or same jumping. Maybe dampner is shot and outer ring is doing some major slipping.
Is your vac adv disconnected and vac connected to manifold/carb plugged?
Yeh, could be a bad timing light. Do you have a multi spark ign box? If so try and bypass the ign box to time it.
Hope this helps ya,
cardo0
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74 T-top, L-48, 4spd, A/C, narly blue. Goodwrench 350 underwent new heads (SR Torquers), Schneider solid cam and Thorley headers due to domino effect of broken motor mount >broken fan shroud>remove radiator & A/C package. Now runs a Performer Air Gap with a lars majic chokeless Qjet on top. Also Street dampner, MSD dist, 6AL and Baster II. http://members.cardomain.com/cardo0
Jumping of the timing light on the balancer can be caused by too much vertical freeplay in the distributor. Shim the distributor gear shaft to have .010 to .015 of freeplay and your problem will probably go away. Other causes are loose timing chain, but you said that this was tight.
Corvette Store
Timing Question
Condition of cap and rotor? Try using plug wire on #6 and see if better or same jumping. Maybe dampner is shot and outer ring is doing some major slipping.
