Timing Question
Thread Starter
Melting Slicks
Joined: Jul 2000
Posts: 2,097
Likes: 99
From: Boston MA
Timing Question
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.)
(It's a newly rebuilt SBC with a tight timing chain, and a distributor that was supposed to have been rebuilt.)
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
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.)
(It's a newly rebuilt SBC with a tight timing chain, and a distributor that was supposed to have been rebuilt.)
Here are some good links to look over
http://www.chevytalk.org/fusionbb/sh...hp?tid/173877/
http://www.dragracingonline.com/tech...-lights-1.html
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
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
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
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
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.
