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.
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.
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.
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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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.
Thanks, all. This lets me remove over half the weight from the 27lb flywheel in an E46 ZHP Valeo SMF conversion kit.
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.
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.
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?
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.
If you are looking for the same price you would get for a higher production item, I don’t have any ideas.
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.
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