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Old 04-08-2012, 02:16 PM
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Timing Issue

Ok, here's a new one on me. I fired up a new motor this morning, and it spits a bit through the carb when firing up but then smooths out in the higher RPM range. Here's the new to me part: when I went to check the timing, my gun found the timing mark at 64 degrees ATDC. Moving the distributor kills the motor. I've triple-checked the firing order, have checked TDC on the balancer to the #1 piston and have run the valves 3 times. Where have I goofed up? I guess some info on the motor would be nice. It's a '75 Chevy 454 bored and stroked to 468 ci. Has a mild Comp Cams Thumpr cam, roller rockers, a Summit 750 cfm carb and an Accel big cap HEI with Accel 8mm wires. I don't see a way to attach the video here, so tough noogies there. HELP! lol
Smokey
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Old 04-08-2012, 02:21 PM
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Have you got the timing light on the #2 wire?
90-64=?
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Old 04-08-2012, 02:36 PM
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X2. Be sure the timing light's inductive pu isn't getting signals from the wrong wire, even if the pu is on #1. Use #6 plug wire if there's cramped quarters around #1.

Info HERE on the different timing tabs/damper lines that can also confuse the issue.

Be sure the outer ring of the damper hasn't slipped, more HERE on finding TDC.
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Old 04-08-2012, 02:46 PM
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Nope, light is on #1. The balancer is a brand new FluidDamper (sp?) so I'm pretty sure it hasn't slipped. I will try the #6 wire and see what happens. Thanks!
Smokey
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Old 04-08-2012, 03:04 PM
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If distributor is installed correctly, and plug wires are on correctly, and it needs that much lead to just run then the cam is not indexed to the crank properly.
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Old 04-08-2012, 03:12 PM
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#6 wire a no-go, still 64 degrees out. I'm gonna restab the distributor and see if that's out a bit. Sport, bite yer tongue Buddy! lol This motor has a gear drive in it, and I just looked at the pics from when I put the front end of the motor together, and the crank and cam are indexed properly. Also, I used a degree wheel before I dropped the heads on to make sure everything is in line. I'm not the one that dropped the distributor in, so Im gonna check there.
Thanks again!
Smokey

PS How does a guy attach a pic or video?
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Old 04-08-2012, 04:24 PM
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Taking the dist out and putting it back in is not going to help. If it is running it is close to being correct. There is no way it is running 64 degrees retarded so you are doing something wrong. Are you running an MSD box by any chance. Some timing lights do not work correctly with the multi spark ignitions.

The first thing you should do is prove the damper tdc is actually TDC. Search on here for finding true tdc and make or buy the tool. Until you prove the damper 0 is actually close to 0 doing anything else is a waste of time.

Moving the distributor will not help you.
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Old 04-08-2012, 05:22 PM
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Quote:
Originally Posted by smokey626
...PS How does a guy attach a pic or video?
Take a look at this sticky...
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Old 04-08-2012, 06:05 PM
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Ok, you guys aren't gonna believe this (because I sure as heck don't) but, as I was taking off the cap, something inside caught my eye, or should I say DIDN'T catch my eye. The damned tab inside the cap for the #1 cylinder was missing! I got a new cap, reinstalled everything and fire the motor back up. Viola'!! No more pop through the carb and the timing mark now lines up!! Any of the pros seen this and can explain why the missing tab made this all happen? Here's a pic of the motor on the run stand! (hopefully!)
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Old 04-08-2012, 09:27 PM
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Last edited by cobalt327; 04-08-2012 at 09:36 PM.
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