325i M20 (from E30) conversion to 2.8

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  1. 325i M20 (from E30) conversion to 2.8 
    #1
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    oaktree11's Car Details
    Model of Car:
    325i E30
    Year of Manufacture:
    1986
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    Marlin kit car

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    Hi there, I have a 325i engine, in good condition that I am going to build int a Marlin Sportster kit car. I was going to strip and rebuild it anyway (its done 100, 000+ miles but was running well whe removed.)
    Has anyone any suggestions as to modifications to get more, road useable, power?
    I was considering making it a stroker with the bottom end of a 325e I believe. Any information on what is involved would be welcome.
    Alternatively what other engine should I consider as a replacement that wont give me too many electrical complications?
    Any ideas welcome, I am just starting to learn! thanks
     
     

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    #2
    rm1
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    rm1's Car Details
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    There is a guy on e30 zone who has built a 2.7 in a Marlin sportster have a look at his build thread.
    But if you are going to stick with the standard block m20 a chip BTB manifold and cat cam are the way to go especially worth doing if you have the full fat high compression early m20.
    Alternatively I would look at an m50 2.5 from an e36 325.
     
     

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    #3
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    nas80's Car Details
    Model of Car:
    e21 m50b25
    Year of Manufacture:
    1982
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    You know you can also use the crank from an e36 328i. i can't remember if u need to stick a shimmering in and grind a bit of cast off the block.

    seriously don't waste time on an m20 you want to transplant 24v power just cos it will work out cheaper and make a miles better noise then then the 12v as well as have more stable power.
     
     

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    #4
    rm1
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    the m50 does make a nice noise but it depends on how much effort and cost you want to go to. That early m20 is an underated engine and with the right manifold and chip will make good power.
     
     

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    #5
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    nas80's Car Details
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    Yea but even if u 2.7 an m20 its still only going to make 200hp tops. is far cheaper to buy an m52b28 and do the intake mod and run 220hp and with better economy and with 40kgs less weight
     
     

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    #6
    rm1
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    I know what you are saying but the guy already has the m20 and it will take a lot more abuse than an m52. Oh and a good 2.7 will make over 200bhp with lots of torque, people that have actually driven a good one aren't so mad on the 24v engines though on paper they do look the business. It's about cost/effort and preference at the end of the day and he's a lucky bleeder to have any of those engines in a kit car.
     
     

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