Flywheel - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 27th, 14, 11:33 AM Thread Starter
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Bob
 
Join Date: Oct 2005
Location: New England
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Flywheel

Im getting confused about my big block flywheel. Ive been fighting a vibration for a while now and my engine builder says I need an externally balanced flywheel. I guess 1 piece rear main seal blocks need an externally balanced flywheel? (or something like that).

That being said, from this picture: http://maxboostracing.com/camaro/block.JPG can you tell if this is 1 or 2 piece rear main? And as a followup, can you point me in the right direction for the correct flywheel I need?
Thank you!

68 RS/SS 496 T56 6 Speed Tuxedo black w/ white bumblebee. Strange Dana 60, Spicer 3.73 Helical Gears
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post #2 of 5 (permalink) Old Oct 27th, 14, 12:04 PM
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Dave
 
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Re: Flywheel

It isn't a one piece rear main seal thing, as the ZL-1 all aluminum and the cast iron ZZ427 one piece rear main seal have a neutral balance (they are internally balanced).
However the 454 and a the newer 502 are externally balanced because the factory engineers didn't want to have to worry about putting two additional counter weights in the middle of the crankshaft for some reason (the aftermarket cranks have no difficulty adding in the extra counter weights if you are willing to pay them).

Both the 454 and the 502 rely upon additional weight added at the end of the crank instead of the middle where it belongs. The weights are inside the harmonic damper and attached to the outer edge of the fly wheel or flex plate. To keep the weight in the correct place the harmonic balancer is keyed with a Woodruff key and the fly wheel or flex plate are located with a dowel pin in the crank flange. Because the weights are not where they belong, there is a constant oscillation in the crankshaft as it flexes up and down due to that weight being spun around (the weight pulls on the crank like a weight on the end of a string you spin around above your head).

I you have a blower belt also yanking on the crank snout in addition to the external balance you could conceivable break the crank (especially if it is a 4340 chrome moly crank as chrome moly will work harden faster than a high carbon 5120 forged crank will). At the very least it will wear out the end main bearing faster than any other main bearing because of the extra load.

If you didn't put on an externally balanced fly wheel or flex plate on your 454 it could shake the motor to pieces. But I doubt if that is the problem as the vibration would be very noticeable. You may have other issues such as pinion angle or drive shaft phasing issues. Either way it needs to be checked out.

Big Dave
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post #3 of 5 (permalink) Old Oct 27th, 14, 12:09 PM Thread Starter
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Bob
 
Join Date: Oct 2005
Location: New England
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Re: Flywheel

Thanks for the info Dave. Im thinking thats exactly my issue. Its not driveshaft or pinion angle, it did it before the car had a driveshaft even installed. It does it in neutral just sitting in the driveway. I am getting a good vibration at 1900 rpm or so, enough to shake the dash pretty good.

So it sounds like you're saying I need a balanced flywheel? I dont know much about the one I got on there so Im going to have to assume its not balanced now.

68 RS/SS 496 T56 6 Speed Tuxedo black w/ white bumblebee. Strange Dana 60, Spicer 3.73 Helical Gears
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post #4 of 5 (permalink) Old Oct 27th, 14, 02:26 PM Thread Starter
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Bob
 
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Re: Flywheel

This is the flywheel I used, can anyone say if its right or not?

http://www.summitracing.com/parts/ram-1521

68 RS/SS 496 T56 6 Speed Tuxedo black w/ white bumblebee. Strange Dana 60, Spicer 3.73 Helical Gears
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post #5 of 5 (permalink) Old Oct 27th, 14, 03:15 PM
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Don
 
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Re: Flywheel

It looks like you have an external balanced flywheel, but what about the crank harmonic balancer.
Read Dave's note again, he is talking about the harmonic balancer for the 454 and 502 as well as the flywheel.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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