m20/b25 overbore.

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pip
E30 Zone Newbie
E30 Zone Newbie
Posts: 12
Joined: Tue Jun 13, 2006 11:00 pm

Sat Mar 17, 2007 4:52 am

Hi team,i have a question to ask?I want to overbore my m20/b25 block to 86mm,what BMW pistons will fit from another BMW model if any.I would prefer to use BMW pistons but i'm open too suggestions,thanks Kiwi Pip.
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StuBeeDoo
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6756
Joined: Sat Feb 05, 2005 11:00 pm
Location: Up My Own Arse

Sat Mar 17, 2007 9:40 am

I may be wrong here, but AFAIK anything beyond 84.5mm (standard maximum over-bore) is pushing it in a M20 block. There's very little metal left between the bores and water jackets beyond that point.
This is why I no longer drive an E30......

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