M20 types and part compatibility

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ten2doyle102
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Re: M20 types and part compatibility

Postby ten2doyle102 » Fri Mar 20, 2009 4:14 pm

BMWIS wrote:
M20_fever wrote:
BMWIS wrote:A couple other questions. What's the max overbore that one can do to an M20 B25. It seems people avoid overboring. Is that just to save money. I'm thinking of a .040 overbore.


86mm but thats pushing it.


I'm dumb. How much is 86mm over standard bore in "'s


And man oh man I was hoping someone would comment on the Euro motors.


Conversion: 1in = 25.4mm

86mm = 3.3858" approx.
84mm (stock) = 3.3071" approx.

So that would be about .0787" bigger.


As for the euro motors, sorry, I don't know much on them!
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Re: M20 types and part compatibility

Postby Trent » Mon Mar 23, 2009 10:33 am

Ok i so didnt know that the m20b5 had a smaller stroke than the m20b23.
Just curious but im not too sure did you guys in the us get the 323
cheers for the info
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Re: M20 types and part compatibility

Postby Court M3 » Mon Mar 23, 2009 12:55 pm

We didn't get the 323i. Some people did import them though.
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Re: M20 types and part compatibility

Postby Trent » Tue Mar 24, 2009 11:29 am

cheers thats what i thought it was only a euro model.
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Re: M20 types and part compatibility

Postby BMWIS » Wed Mar 25, 2009 2:49 pm

Ok here is an M20 question.

Is the Euro 885 325i head the same as the US 885 head?
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Re: M20 types and part compatibility

Postby ten2doyle102 » Wed Mar 25, 2009 3:04 pm

RealOEM gives the same part numbers. I would guess them to be the same since they'd have the same casting numbers.
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Re: M20 types and part compatibility

Postby M20_fever » Wed Mar 25, 2009 3:07 pm

yes, all 885 heads are the same.
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Re: M20 types and part compatibility

Postby BMWIS » Wed Mar 25, 2009 7:36 pm

Who sells BMW pistons?
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Re: M20 types and part compatibility

Postby Tchao » Wed Mar 25, 2009 8:00 pm

Try eBay.
I got a set of brand new Mahle pistons with OE Malhe rings for $125.
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Re: M20 types and part compatibility

Postby BMWIS » Wed Mar 25, 2009 8:58 pm

Needs to be overbore. .040
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Re: M20 types and part compatibility

Postby M20_fever » Wed Mar 25, 2009 9:10 pm

unless you go to a factory overbore i.e. 84.5mm you will need custom pistons.
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Re: M20 types and part compatibility

Postby Tchao » Wed Mar 25, 2009 9:24 pm

Most replacement pistons are overbore. Rarely do you find pistons of the original bore. Which you shoudn't anyways.
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Re: M20 types and part compatibility

Postby Orac » Tue Jun 23, 2009 8:55 pm

320is did not have a m20b20. It had an S14.

320i had a m20b20. The m20b20 used the 731 head.
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Re: M20 types and part compatibility

Postby M20_fever » Tue Jun 23, 2009 9:03 pm

Didn't only South Africa get the s14 powered 320is? IIRC it had factory 5 lug as well.
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Re: M20 types and part compatibility

Postby BimmerJake » Tue Jun 23, 2009 9:04 pm

that was my understanding, i'm pretty sure everywhere else what the b20.
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