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Title: Measuring for shim calculations Hot or Cold. Post by: parrish on June 07, 2011, 05:23:43 PM When measuring the gap between the cam and 'Cam follower' should the engine be hot or cold?
What is the exact procedure and calculation? Steve Title: Re: Measuring for shim calculations Hot or Cold. Post by: Henk on June 07, 2011, 05:54:38 PM depends on the manufactures mantainance specs
but in general cold engine what I remember.. we would let them stay overnight and measure clearance in the morning Title: Re: Measuring for shim calculations Hot or Cold. Post by: mirafioriman on June 07, 2011, 05:56:08 PM Far easier on a cold engine, you don't burn your fingers ;)
Title: Re: Measuring for shim calculations Hot or Cold. Post by: Henk on June 07, 2011, 06:17:42 PM yep, I 've had my share (blister wise)
Title: Re: Measuring for shim calculations Hot or Cold. Post by: Tas131 on June 07, 2011, 10:34:27 PM Cold, the gap will close a bit when hot!
Title: Re: Measuring for shim calculations Hot or Cold. Post by: Henk on June 08, 2011, 06:24:17 PM yes that is right it gets smaller when temp. is rising
the whole idea is to still have a small gap when the engine is hot (to make sure the valves are 100% closed when not engaged by the cam) some manufatures give clearance specs for both cold and hot engine but if you only know the cold setting, it will be difficult to calculate the exact hot setting (you need to know material, diameter / mass of camshaft, percentage of volume increase related to temp etc. I believe there is some generic cold to hot conversion rule, but I forgot what it is..... |