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Thread: E30 to e21 what swaps over?

  1. #1
    Join Date
    Jul 2018
    Location
    Southern indiana
    Posts
    5
    My Cars
    1991 325is 1989 240sx

    E30 to e21 what swaps over?

    Hi I'm new to this forum. I've been searching around trying to answer my question myself but keeping leading myself around in circles, so I figured I'd ask people that know more. I've talked to people I know who like bmw and read stuff on forums but haven't been able to get any clear answers. Some people say certain things will swap over and some wont but it's always different some say nothing will. I have a e30 I'm not gonna be able to title I was looking around and found a e21 for sale local I've always like them and I've only seen now 3 of them around here one at a mechanic and one wrecked in a junk yard. I would like to pull my m20 out of my e30 and put it into the e21 that has a title. But my e30 has a few upgrade parts I would like to keep what will swap over and bolt up with no modifications or slight modifications. I'd like to know what will work if I'm just better off going for the e30 which I know will be ALOT easier but sometimes theres no fun in easy.

  2. #2
    Join Date
    Aug 2009
    Location
    Metro DC
    Posts
    826
    My Cars
    79 323i, 94 325is, 13 M3
    Greetings, I have an E21.

    The M20B25 from an E30 will swap over, and so will the transmission. As you probably know, the easiest way to do the motor swap is to find a subframe from an E21 Euro, which used the same engine block.

    E30 wheels will swap over though spacers are often needed.

    I'm not sure what other parts you would like to transfer, but polite questions to the E21 forum here will get you good advice from people who know what they're talking about.
    If God meant for man to motor-swap LS engines into track cars, He wouldn't have created Corvettes.

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