weird single mass flywheel with reference pin

[rede30]

I'm pulling apart a motor from an 87 325is. The flywheel is single mass but it has a reference pin. I know early etas have a single mass with reference pin but those flywheels are much thicker and heavier. This one is 18lbs 11oz. Anyone seen this flywheel before?

[Andre3127]

It has probably been machined thinner to fit your car. Was your car manual swapped?

[cunninglinguist]

Early 325i flywheel. 11 22 1 706 575

[rede30]

Early 325i flywheel. 11 22 1 706 575

Thanks so much. I was not aware there was an early i flywheel. realoem shows the cutout date as 12/86. They also list it as a "twin mass" but I always thought twin/dual mass means they are sprung.

[cunninglinguist]

You are correct. The page title/section title in the catalog is generically called "Flywheel / Twin Mass Flywheel" regardless of what came on the car.
But if you look at the line items, a description will indicate whether the flywheel is a "flywheel" or "twin mass flywheel". Refer to the descriptions for #8 on this page to see what I mean.

http://bmwfans.info/parts-catalog/E30-2-doors/USA/325e-M20/browse/engine/flywheel_twin_mass_flywheel/