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121ti heads, E12 head


tiiii

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2) 121ti cylinder heads. With seats & guides, no valve gear or cams. Flat, no cracks, only shaved once, if any. Best Offer > $300.00 ea

 

1) E21 / 2.0 head, bare w/guides, flat, full height, no cracks. Best Offer > $350.00
 
1) 1.8i head w/valves & cam. Flat, no cracks, only shaved once, if any. Best Offer > $300.00

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52 minutes ago, goodkarmech said:

I used to know the minimum cylinder head height on these, can someone post a spec or a link?

I have a couple hanging around and need to see if they are OK or junk.

TIA,

Al

 

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76 2002 Sienabraun

2015 BMW F10

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That may be BMW's minimum spec but it may not be the actual practical minimum. It would be good to know that latter figure. I know that I have shaved heads multiple times with no bad result. What they had been taken down to, however, is unknown.

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55 minutes ago, tiiii said:

That may be BMW's minimum spec but it may not be the actual practical minimum. It would be good to know that latter figure. I know that I have shaved heads multiple times with no bad result. What they had been taken down to, however, is unknown.

The math as to how much of a shave effects %of °of cam timing retard is available. The practical minimum is the probably the specified minimum with no other standing wear issues in cam chain and gears, lobe wear, and rocker wear that all affect cam timing. Of course also barring installing an adjustable cam gear. Your head at under minimum thickness should be priced as such.

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