Stack auto flex plate with manual flywheel?

[moroza]

Anyone ever see an auto flex plate sandwiched between a manual flywheel and the crank, for use as a ring gear only? Basically this:


Except cobbled together from a stock flexplate, and a regular flywheel with its rear surface machined to compensate for the flexplate thickness.

[spyderg0d]

Id think someone would just buy a proper flywheel inatead of spending all that time and money on a wierd contraption. It doesnt quite look right either.

[pbonsalb]

I think a few people doing custom trans conversions have done this. I recall seeing some pictures in the FI section. Maybe as part of Ford T5 or Tremec conversions.

[Smoky540i]

I believe the guy that built the “gristle hammer” (E34 wagon with M70) did this to make it work with the M5 flywheel.


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[Def]

Pretty common on 5.5 and 7.25" clutches.

The term is called "button flywheel" for the small flywheel that mounts the 5.5 or 7.25" clutch.

[moroza]

Thanks, all. This lets me remove over half the weight from the 27lb flywheel in an E46 ZHP Valeo SMF conversion kit.

[pbonsalb]

It’s also possible to buy a 13 lb flywheel with ring gear.... With the light flywheel, you might want to raise the idle speed in the tune for less rattle and easier engagement off the line. 850-900 rpm.

[moroza]

I'm unaware of a mid-weight kit for a GS6-37BZ. It's either 10lb or 27lb from what I was able to find.

[pbonsalb]

Ok. May be fewer options for that trans, the input shaft of the version of GS6-37 you have, and maybe the engine it will be attached to. Doesn’t UUC sell one? Rob put a GS6-37 in an E36 10 years ago. Maybe Spec?

[moroza]

I can't get a weight spec on the UUC, but that kit is three times what I paid for a Valeo kit, including having it machined, so...

SPEC makes things for this car but they too don't list weights.

[pbonsalb]

If you are looking for the same price you would get for a higher production item, I don’t have any ideas.

[moroza]

No ideas requested at this time. Based on the first few responses and corroborated elsewhere, I sent the flywheel to a machine shop, who removed the starter gear and nearly half of the material. I'm going to reuse my auto flex plate for starter function, and end up having spent ~$550 for a ~17lb single-mass flywheel with a sprung clutch.