12a motor +13b flywheel ?

[C. Ludwig]

You can not use a 13B counter weight or flywheel on a 12A engine. The flywheel or counter weight is matched to the rotor weight. The 12A and 13B rotors require different weights. You will need a 12A flywheel or a 13B flywheel bolted to a 12A counter weight.

[elmer fudd]

seems some one had to drop in and say that. lol it seems to make sense to me, as that was how I thought it went, now when you say a 13b flywheel with a 12a counterweight, that would only pertain to aftermarket flywheels because stock ones have the weight cast into it right?

lets make this a bit easier. I have a 12a car that was a auto, and a 13b parts car with a standard setup, and the plan was to swap the flywheel on to the 12a and bolt up all the 13b stuff. will this work. or do I need a 12a flywheel.

[C. Ludwig]

Originally Posted by elmer fudd

seems some one had to drop in and say that. lol it seems to make sense to me, as that was how I thought it went, now when you say a 13b flywheel with a 12a counterweight, that would only pertain to aftermarket flywheels because stock ones have the weight cast into it right?

Correct.

Originally Posted by elmer fudd

lets make this a bit easier. I have a 12a car that was a auto, and a 13b parts car with a standard setup, and the plan was to swap the flywheel on to the 12a and bolt up all the 13b stuff. will this work. or do I need a 12a flywheel.

That will work. Are you using a 13B turbo or NA flywheel? Not sure what the diameter of the 12A ring gear is off the top of my head, but I'm guessing the 12A and 13B NA are the same. If that's true, and you have NA stuff, you could run any mixture of the parts. If you're bolting up a turbo flywheel you will need to use a turbo trans. Basically, the bellhousing needs to match the diameter of the ring gear so the starter will engage.

Lastly, kinda obvious, you will need to use a clutch that matches the flywheel/trans combo and not the engine.