Identifying dual/single mass

[turnofftheradio]

So, while everything is apart, I figure I should replace the clutch.

The car is an 85 eta, but... the engine has casting no. from '86, and I have no clue on the trans. I know neither are original. the car is frankinstein.

Is there a way to visually tell which I have? or should I just pull the flywheel and weigh it?

[Jordan]

One is a SINGLE MASS.

The other is a DUAL MASS.

[e30Matt]

To clarify, you'll be able to easily which is which by looking at it. The single mass will be one piece of metal, the dual mass will obviously be more than that. Plus the dual mass will weigh in the neighborhood of 25-30 pounds, while the single mass will weigh more around 15-20.

[turnofftheradio]

ok, I figured that both were a 1 piece design, just one was bigger. I have not seen any bmw flywheel besides my own. It would seem that I have a single mass. I think I'll weigh it too, just to be sure. thanks for the weights

[turnofftheradio]

One is a SINGLE MASS.

The other is a DUAL MASS.

don't mass with me