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Old 08-11-2006, 09:42 AM   #1
HamFist
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Default valve-to-piston + valve-valve clearance specs?

What are these specs on a 2000 SOHC 10:1 compression N/A motor?
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Old 08-12-2006, 08:12 PM   #2
MSR
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Rule of thumb is .090" on Ex and .110" inlet.
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Old 08-12-2006, 08:31 PM   #3
HamFist
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Is that what it specs out to on the stock 10:1 2.5L engine? Thanks for the rule of thumb, but I'm curious what it might actually measure out to .
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Old 08-12-2006, 08:49 PM   #4
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No idea, way more than that, the rule is what you can build a high comp dome piston too, with high overlap cams, std ej has stuff all overlap, so would have a heap of room, but if a belt were to break would hit.
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Old 08-12-2006, 09:38 PM   #5
HamFist
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I'm not as worried about a belt breaking as I am about one skipping a tooth from revving too fast. I've heard of that happening but I've never seen it around here. How often do the belts actually break anyway?
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Old 08-13-2006, 03:06 AM   #6
MSR
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They can jump when the tensioner is at the end of it's travel, either from machining black heads, or worn.
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Old 08-13-2006, 03:11 AM   #7
HamFist
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My heads will likely be milled .005 just to surface them. Will that cause any problems with the tensioner?

Last edited by HamFist; 08-13-2006 at 03:32 AM.
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Old 08-13-2006, 03:16 AM   #8
MSR
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No, it's when you take a .5mm off each head you can run into issues.

I have run turbo engines with only .060" on exhausts and never had them touch.
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Old 08-13-2006, 03:41 AM   #9
HamFist
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Thanks for the input .

BTW, what should I pay for new valves? I heard of some company selling them for about $250 for new stainless steel valves, but I don't now who it was. I don't remember if it was Crower or someone else (???).

Last edited by HamFist; 08-13-2006 at 03:54 AM.
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Old 08-13-2006, 05:04 AM   #10
MSR
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Have to shop around and try and get 1mm larger ones.
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