69 DZ302 Timing Question - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 30th, 04, 04:58 PM Thread Starter
 
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Hello all.
I have been trying to time my camaro to the specified 4 degrees BTC and when I try to back the timing back that far, the motor runs horribly. When I time it at about 22 degrees or so, it runs fine. I am plugging the vaccum advance as recommended and adjusting the idle to 900 rpms. I want to make sure the motor is timed properly but can't figure out why this is happening. I have read about every book I can get my hands on to educate myself about this topic but can't find what I am misinterpretting. Anybody feel like taking a few minutes to help a frustrated fellow camaro owner.
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post #2 of 8 (permalink) Old Apr 30th, 04, 06:07 PM
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The harmonic balancer is two piece with rubber between. These can slip over the years so that the mark on the balancer is really not at top dead center! If it has sliped 20 degrees or so you should be able to check it by removeing #1 plug, bringing the piston to TDC and check the timeing mark on the balancer against the indicator on the cover. You won't be 100 percent accurate but you could sure tell if it is 20 degrees out. [img]graemlins/waving.gif[/img]
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post #3 of 8 (permalink) Old Apr 30th, 04, 06:13 PM Thread Starter
 
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Thanks MJM,
I will give your suggestion a whirl tomorrow.
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post #4 of 8 (permalink) Old Apr 30th, 04, 06:27 PM
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I you need to, Damper Dudes in California will rebuild your original damper for $100. The distributor Jerry MacNeish built for me is set for total timing of 36 deg. @ 2800 rpm for pump gas. Dwell of 30-32 deg.

Gary

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post #5 of 8 (permalink) Old May 1st, 04, 04:40 AM
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Remember to set the timing first, then the idle. You might need to open up the idle speed screw a bit to get the timing down that far.

The factory curve sucks either way. I would recurve it to run about 12-16 initial and 36 all in by about 3000 RPM and you will like it much better.

-Mark.
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post #6 of 8 (permalink) Old May 1st, 04, 05:00 AM
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I agree with what Stingr69 said. Also make sure you have the correct timing cover.


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post #7 of 8 (permalink) Old May 1st, 04, 03:55 PM
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There are alot of variables with finding the correct TDC and harmonic balancer. Did you check TDC and the harmonic balancer when the motor was built. If you have a piston stop you can install it in the #1 spark plug. Then rotate the motor by hand until it hits the piston stop. Mark your harmonic balancer where the pointer is at on the balancer, Then rotate it the oppposite direction and mark the balancer where the pointer is. Then measure between the two marks and that is TDC. Now compare that new mark with the original mark on the harmonic balancer and you will see if something is off. It could be your balancer or timing pointer.

Mike
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post #8 of 8 (permalink) Old May 4th, 04, 03:08 PM Thread Starter
 
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Thanks everyone for the input. What I decided to do was have my wife watch the number one spark plug opening with a mirror as I hand cranked the motor in both directions as Prostreet69 recommended. The TDC in both directions was within a degree or two from 0. I also realized that I don't have the original harmonic balancer and there is a pointer instead of the "sawtooth" style tab. The only thing I can think of is that when the motor was rebuilt (by the previous owner) that a different camshaft was installed. Wouldn't this affect the timing in a way that would require additional advance?

Thanks for the input so far, and please excuse my ability to reply promptly.

Thanks,
Eric.
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