Balance issue… help!

[olddog]

Originally Posted by Prestidigitator

He tells me there is about 6-9 different combinations he is going to try to get the motor to balance without taking the transmission apart and taking off the flex plate (as I understand it).

Does any of this sound copasetic to you?

There are three possibilities:
The engine is zero ballanced
The engine is 28 oz off set ballanced
The engine is 50 oz off set ballanced

Some of the ballance is done on the harmonic ballancer on the front and some is done on the flaywheel/flex plate on the back of the engine.

I suspect the fellow is planning to use different ballance sets on the front and back of the engine. Like mixing a 28 oz on the front and a 50 oz on the back or some other combination. Anyhow that is the only way I can come up with the number of combinations that you said.

I would not go down the road of mixing something different on the front from what is on the back. Both front and back need to be the same type of ballance. I am assuming that no manufacturer would be stupid engough to actually ballance an engine with a 28 oz on the front and a 50 oz on the back or some other combination.

If after trying a zero, then a 28 oz, and finally a 50 oz, (same on front and back each time), and it still does not ballance out with any combination, only then would I suspect something stupid has happened. However before that I would question that all the plug wires are in the propper order and that the engine is running correctly.

A ballance issue will get better and worse at different rpms, where the worse spots will happen at certain harmonics. For instance the bad spots may be at 2000, 4000, and 6000 rpm (I pulled those numbers out of my arss).