0 oz/ internal balance- flywheel balancing

[Caprimaniac]

Hello.

I'm not an eager poster in any forum, but I look throgh Club Cobra forums for input every now and then.

Now I have a question for those with some engineshop experience......

A new BALANCED, 0 oz internal balance, 347 stroker kit is on it's way from Eagle. I have added ARP 2000 rod bolts as my cam and valvetrain willingly spins to 7500 RPM+.

I have an aluminium flywheel that I wish to use with this combo.

Today I've used a WHEEL balancing machine to check the balance of my flywheel + pressure plate. The machine was set to the dimensiom of flywheel/ pressure plate: 2,5" width and 12"Ø.

This showed 20 grams imbalance on flywheel side, and 90 grams on the pressure-plate side (after removing a few grams with drill and grinder).

My questions are:
Is it possible to balance this thing using this kind of equipment?

And: What kind of imblance is acceptable on these things that will spin around at 8000 RPM? Does it have to be 0 in "all corners" or is soma OZ acceptable?

Hope to get some input on this..... Before I take it to a proper machine-shop!


Rune S.

[vector1]

reclock your clutch assbly on the wheel balancer and do it again, bet it doesn't show the same and if it does i wouldn't trust it to balance something like this to the precision that is needed.

[Caprimaniac]

I did bolt it up several times and the machine showed same amount of imbalance at the same spots.

But a funny thing happened when I turned the pressure plate 180 degrees on the clutch: it showed the SAME amount of imbalance at the same spot on the pressureplate side with reference to the flywheel!

That's when I packed up and went home....

RS

[Rick Parker]

Generally a good shop that does balancing will have various components that are already "0" internally balanced such as a dampener or flywheel which are attached to a crank that is desired to be "0" balanced. then after the crank in question is brought to "0" by removal of material from the crank, the other customer parts such as flywheel and the dampener are attached 1 at a time and necessary material removed from them individually to maintain the "0" balance. This would also hold true for the pressure plate although they are normally "0" balanced to begin with. Then in the future any damaged part could be replaced with a "0" balanced item and maintain the overall balance of the assembly.
Your equipment will not balance the engine parts. Take it to a competant engine shop.