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  1. #1
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    ok another one for the engine people

    Ok so I started out looking for an m30 but I ended up getting an m20 for free that needs put back together all stock I know it will hold boost but it has one flaw its an eta but my question is will a normal head be swapped for the performance or do they have differ head surfaces

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    Just to be clear are you asking about the head between an M20/M30? Just trying to understand exactly what you are asking.

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    No the engine I got is an m20 eta and I'm wanting to find out if a m20 head from an I engine is a direct bolt on

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    Click here to enlarge Originally Posted by pixley Click here to enlarge
    No the engine I got is an m20 eta and I'm wanting to find out if a m20 head from an I engine is a direct bolt on
    So M20B27? I wish I could answer for you but I'm not familiar with the motor.

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    2 out of 2 members liked this post. Reputation: Yes | No
    You can swap out the head with an "I" head and it will yield super low compression (7 or 7.5:1)
    From what I remember, and its been a long tike since ive played with m20's, the bottom end on the eta motors did not lend themselves to higher rpm use. Depending on your goals you may be fine. If you are planning to run low to moderate boost levels then yes, from what I remember the head (you will need the 885 casting) mate up fine.

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    1 out of 1 members liked this post. Reputation: Yes | No
    Edit: ours was a super eta (88) so from what I just saw the eta was different. Check strictly eta site . Looks like you will need to swap pistons if its the normal eta

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    just find an M30...they love boost Click here to enlarge

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    Ok so I have a m20b27 eta and a m20b25 I. So it comes down to m20b27 with an 885 head! And I found a m30b35 for 400! So I'm at odds if I should sell the two m20's and buy the m30? And also what's the Max power output from both engines vs weight?

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    Click here to enlarge Originally Posted by pixley Click here to enlarge
    Ok so I have a m20b27 eta and a m20b25 I. So it comes down to m20b27 with an 885 head! And I found a m30b35 for 400! So I'm at odds if I should sell the two m20's and buy the m30? And also what's the Max power output from both engines vs weight?
    Weights likely won't be that big of a difference. Why keep the two M20's? Sell them and get the M30.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Weights likely won't be that big of a difference. Why keep the two M20's? Sell them and get the M30.
    Thanks man and also where do I post build thread for engine /car

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    Click here to enlarge Originally Posted by pixley Click here to enlarge
    Thanks man and also where do I post build thread for engine /car
    In this forum section you are posting in now.

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    The m20 is a great motor but ultimately the m30 will take more abuse and keep on going so if you have the choice go for it. The m30 is a true workhorse and will hold up for hundreds of thousands of miles under boost. I know of several in the 400+ whp range with 200k plus on the clock, and have a customer with over a half million miles on one that runs like a top. He just did a hg at 425k. Imo it was the most solid motor ever made

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    1 out of 1 members liked this post. Reputation: Yes | No
    Thanks man I know the m20 ill hold up but Idk about under boost I have a customer at my shop with a 325es with 397k miles and runs great we drift in it all the time but from what IV seen so far the m20 is onlygood for 450 HP or so without extremely extensive mods and the m30 well with the m88 style build is good for 400 without boost and muchmore with boost so IV decided to go with the m30 and build from there! Thanks again guys for all the opinions and input.

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    M30 all the way man. My oldman has a 535i e28, 300k plus and still works like a champ. Boost it up to 500hp and on stock internals it can hold it together like a champ.

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    Ok so i waited all this time and my wait payed off im picking up a m30b34 for 225 dollars i think thats a steal

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