325e and 325i 5 speed

[89325iturbo]

i was thinking of maybe doing a 2.7i. The engine in my car is an I with a 5 speed. The parts car is a 5 speed aswell. Just wasn't sure is there a difference in using either transmission? The E is a 84, I heard there might be something with the output shaft between transmissions being a different size.
So I was thinking just thinking stay with the E trans so I know it bolts up fine.
Can I use 325i clutch and flywheel?
Are driveshafts the same?

[TobyB]

The shaft is the same size, but the e bellhousing is deeper for the added sensors.

The only real problem this poses is in getting the right throwout bearing if your e
has the dual mass flywheel, or a different thickness flywheel.
But this is easy to measure and check the whole clutch stack. They are
different heights, and the pressure plates are different.

Should work, otherwise.

Oh, except you may need to change the output flange- e and later i were different.

hth

t

[rommeldawg]

i think it would be easier to keep the trans that is in your car now. so basically you need to confirm block attachment for bell housings are the same for either bottom end.
So what say ye TobyB? you seem to know

[89325iturbo]

So it would be better to use the I transmission with I clutch pp flywheel bolted to the E block?
Over using the E transmission with I clutch pp flywheel bolted to E block.

[Andy.B]

Eta engines have dual mass flywheels, which are thicker than the single mass flywheels that come on I engines. The transmissions on e cars have slightly deeper bellhousing to accommodate it. I would highly recommend using the lighter single mass flywheel. If you use the I transmission, it will all bolt in find using a normal I clutch kit. If you use a single mass flywheel with an e transmission, you will need to buy a euro 323i throw out bearing (which is thicker) to make up for the thinner flywheel.

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[Andy.B]

This thread (with pictures) covers it pretty well:

http://www.r3vlimited.com/board/showthread.php?t=321991

I have run multiple combinations successfully:
I with I
E with e
I engine with e transmission
2.7i (and i flywheel) with e transmission.

The only thing that can't be done properly is an I transmission with a dual mass flywheel.

[estoguy]

Eta engines have dual mass flywheels, which are thicker than the single mass flywheels that come on I engines. The transmissions on e cars have slightly deeper bellhousing to accommodate it. I would highly recommend using the lighter single mass flywheel. If you use the I transmission, it will all bolt in find using a normal I clutch kit. If you use a single mass flywheel with an e transmission, you will need to buy a euro 323i throw out bearing (which is thicker) to make up for the thinner flywheel.

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Actually, that's incorrect. Up to 04/1986, Etas used the single mass flywheel 11221705046.

Dual Mass flywheels started in 05/1986.

[Andy.B]

Actually, that's incorrect. Up to 04/1986, Etas used the single mass flywheel 11221705046.

Dual Mass flywheels started in 05/1986.

Good to know! Thanks for the additional info. I had heard of a single mass (but still heavier than the I engine) flywheel, but haven't ever actually come across one. I'm not sure how the transmission varies between early/late eta cars. I would love to have someone add the details to the post I linked to above.

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[TobyB]

Yeah, and there was an earlier thread about the earlier eta flywheels that had me
thinking that they were dimensionally unique, too... but my only personal experience
has been with the later DM and single flywheels...

And yes, any M20 transmission will bolt to any M20 block, but you have to get the
right flywheel/clutch/throwout combo for the bellhousing depth.

t