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Milling crankcase deck surface – How much?

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helsingborg

Posts: 82

Joined: Tue Jan 29, 2008 8:08 pm

Post Sun Oct 19, 2008 7:07 pm

Milling crankcase deck surface – How much?

How much metal can be cut off from a stock UL crankcase deck surface without having a major manifold alignment problem. I’m trying to set the squish at 0.045-0.05 but I don’t want to mill the top of the cylinders, because both cylinders had already been nicely relieved and polished. Any suggestions?
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Chris Haynes

Posts: 2631

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Sun Oct 19, 2008 9:45 pm

Re: Milling crankcase deck surface – How much?

Mill the base of the cylinders.
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helsingborg

Posts: 82

Joined: Tue Jan 29, 2008 8:08 pm

Post Mon Oct 20, 2008 9:50 am

Re: Milling crankcase deck surface – How much?

Thanks for the reply. But my dilemma still remains unsolved. As far as I know, milling the base of the cylinder will also affect the manifold alignment in the same extent. In order to reach 0.045 squish I must cut off 0.05 (crankcase deck or cylinder base). If I do so, will I need a custom manifold?
Thanks.
Helsingborg.
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panic

Post Mon Oct 20, 2008 2:57 pm

Re: Milling crankcase deck surface – How much?

No, most manifolds are slightly loose, and the relationship isn't linear.
At worst you just file the ends of the legs slightly.
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helsingborg

Posts: 82

Joined: Tue Jan 29, 2008 8:08 pm

Post Mon Oct 20, 2008 4:27 pm

Re: Milling crankcase deck surface – How much?

Thanks Panic! and Chris!
Helsingborg. :mrgreen:

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