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Early eta's had a heavy single mass flywheel that was essentially the same as the later B25 flywheel, although it weighed about 4-5 lbs. more. The early eta flywheel is 23 lbs iirc. The B25 flywheel weighs about 19 lbs.
The late eta had a dual mass flywheel, that weighs a ton and just sucks. It weighs around 27 lbs.
The early 528e flywheels were 13 pounds AND had a TDC pin!
You can duplicate that by shaving the engine side of the flywheel down to the level of the ring gear but then leave about .010 of a lip, no TDC pin however unless you put one on.
The early 528e flywheels were 13 pounds AND had a TDC pin!
I've got one of these in the command center.
Yeah Rob, all 9/85 and later etas have the giant flywheel. Even the earlier eta single mass flywheel is an upgrade (that's what I had in my eS). Mine was used with a B25i clutch and pressure plate. Worked good.
I weighed all of the flywheels one night at Mitch M's shop on a postal scale. The early 528e/320i/323i flywheel weighs 13lbs., the early eta flywheel weighs 23lbs., the late eta weighs 27lbs., and the B25i flywheel weighs 17 or 19lbs (pretty sure it was 19lbs).
All the bolt patterns are the same for the m20 flywheels, the question is will the stack height be the same.
The pressure plate is a lot thicker for the 325i to make up for the shorter flywheel, realoem would tell you if the part numbers are the same anyhow. Dual mass does not use a sprung hub since the flywheel is spring, and single mass....vice versa.
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