m20 head - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 09-30-2007, 12:42 PM
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m20 head

how much can i shave the m20 head just curious and how do they respond to higher compression?
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#2 (permalink) Old 10-01-2007, 10:40 AM
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Don't shave it past the stock spec or you will run into cam timing issues unless you run and adjustable cam gear.
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#3 (permalink) Old 10-02-2007, 12:10 AM
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what he said ^ you really want to avoid shaving it if possible unless you plan on compensating for it with the cam gear

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#4 (permalink) Old 10-02-2007, 09:19 PM
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well i hafta get atleast 7 or 8 tho off cause its out 6
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#5 (permalink) Old 10-03-2007, 11:15 AM
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Quote:
Originally Posted by RyanPenner
well i hafta get atleast 7 or 8 tho off cause its out 6
7 or 8 what? MM? thenths of a MM? Thousandths of an in?
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#6 (permalink) Old 10-03-2007, 05:02 PM
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Max allowed for maching off the head is 0.3mm.
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#7 (permalink) Old 10-03-2007, 05:13 PM
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ya sounds like hes gonna need a adj cam gear...and a patient mechanic to tune it right lol

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#8 (permalink) Old 10-03-2007, 06:49 PM
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Or a new head that isn't twisted like a fun house slide.
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#9 (permalink) Old 10-03-2007, 06:53 PM
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ehh just double stack some head gaskets and use loads of RTV sealant...

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#10 (permalink) Old 10-03-2007, 07:02 PM
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THAT'll work...

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#11 (permalink) Old 10-03-2007, 10:14 PM
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haha no actually im talking about thousands of an inch LOL mm mite aswell save the time and smash holes in every piston now
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#12 (permalink) Old 10-04-2007, 09:47 AM
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ahh you should be fine as 8 thousandths of an inch is 0.2032 millimeters...wouldn't recommend much more than that

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1987 BMW 325es: Face & Butt Lifted/M50tu Swapped*Sold*
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#13 (permalink) Old 10-18-2007, 04:09 AM
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My head is leaking and i am always putting in water. Cant see anything visually. Could it be coming out of the exhaust? Can i double stack a set of head gaskets in the interim as i dont know how badly warped the head is.
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