Posted by John G. Hasler on August 14, 2012 at 12:37:00 from (174.124.12.228):
In Reply to: Re: help with valves posted by mkirsch on August 14, 2012 at 11:59:07:
mkirsch writes: > The range is really for performing tune-up > checks. If it"s between .014 and .017 you don"t > need to adjust.
Usually it means that the .014 gage should fit but the .017 should not. You can"t accurately measure a gap with a feeler gage: just determine whether or not the gap is larger or smaller than the thickness of the gage.
As mkirsch notes, it isn"t all that critical on the high side. The goal is to make sure that the gap is large enough that the worst-case stackup of thermal expansion, runout, etc. will never prevent the valve from closing completely. A small error on the high side just means that the valve won"t open as widely as it possibly could. Performance tuners worry about this.
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