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Valve clearance

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jones
Larry Williams
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Valve clearance Empty Valve clearance

Post  Larry Williams February 3rd 2010, 1:53 pm

How much closer to the piston does the valve get with a 2 degree advance and a 4 degree advance?
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Post  jones February 3rd 2010, 2:28 pm

Wouldn't that depend on your camshaft? Are you just trying to figure out how to tell before you adjust your camshaft?

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Post  feetfirst February 3rd 2010, 2:48 pm

.007-.008 range per 1 degree.
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Post  paulie9fingers February 3rd 2010, 3:16 pm

jones wrote:Wouldn't that depend on your camshaft? Are you just trying to figure out how to tell before you adjust your camshaft?

x2
I believe the duration and ramp speed functions would have an impact on the results but in any case you shouldn't have any problems assuming your have proper clearances now.
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Post  dfree383 February 3rd 2010, 5:14 pm

Depends on the Cam, where the lobes are ground to start with...... Thiers no rule of thumb or anything like that, it needs to be checked.
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Post  Larry Williams February 3rd 2010, 10:07 pm

I should have checked 4 advanced and 4 retarded when I assembled the motor. Good thing I want to pull the cam to double pin it before it runs. Might do the oiling mods at the same time if I have to pull the heads
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Post  Mark Laczo February 4th 2010, 9:31 am

This was two years ago but, I checked mine from 20 degs BTDC to 20 degs ATDC in 2 degree increments. If I remember right I had to retard the cam 2 degrees and it gained about .015-.020" more clearance on the exhaust valve. The cam was a solid flat of 268/276 @ .050 with .658/.689" lift. I had already flycut pistons and needed additional clearance. Not optimun but it worked okay.

FWIW Mark


Last edited by Mark Laczo on February 4th 2010, 9:34 am; edited 1 time in total (Reason for editing : correction)
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