So my computer tells me that the M20B25 and the ETA use a different flywheel. My question is, why? For some reason I'm thinking that the eta engines used a crank sensor on the flywheel and the 2.5l didn't, but is that the only difference? If it is, could I use a eta flywheel on a 2.5L M20 engine? The reason I'm asking is there's a local u-pull yard that has an 86 325e 5 speed, and I've got a '90 325i auto that I'm planning on converting. I can get everything off of the 325e super cheap, but I don' t know if the flywheel will work. Any ideas?
i'm not positive on it, but iirc the eta engines had a much heaver dual mass flywheel that may use a different clutch/PP. not sure about swapability. i'd check out r3vlimited or e30tech.
It will work it will just rev slower than a standard i car. Or you can get a used i flywheel of one of the forums.
Wilber nailed it, larger dual mass, different pressure plate and the little sensor nipples.
Nipples.
early eta's where also single mass. One of my 325i's came with a dual. I'm not sure how some got one or another. I just went and got the lightest single mass out of a salvage yard, had about 5lbs turned out of it, and went about my business.
The early eta had a single mass but they got dual mass flywheels some time in '86 I believe.
OK, just checked my interchange at work, and it looks like the '84 325e all came with a single mass (approx. 15lbs), the '85 and '86 came with a single or dual, and the '87 and '88 325e all came with the dual mass (approx. 50lbs). Anyone know the weight of the 325i flywheel? My computer listed the other two, but doesn't mention that one for some reason.
Never mind. Looks like my computer was WAY off. Turner Motorsports site shows the single mass eta flywheel at 24lbs, eta dual mass at 27.5lbs, and the 325i single mass at 18lbs. I suppose that answers my question.
