Quote:
Originally Posted by island911
IMO, many people get FAR to anal (OCD) about setting valve lash.
What should alleviate the OCD the most is in having more information - specifically, Know the tolerance on the recommended gap. (the 911 is +/- .002" -that's quite a lot) Also keep in mind, the tolerance, on the cam profile is somewhere around a tenth (or less) of the gap tolerance. (read: you can set them any where off-lobe)
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Quote:
Originally Posted by speeder
Thanks. One of the confusing things to me is that on some engines it seems like the tolerance of the cam profile is a lot looser than you state, ie. I get different measurements depending on where on the off-lobe part of the cam I'm measuring.
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I've wondered about the eccentricity of a cam base circle for each valve. There has to be some deflection static.
You want real OCD, set the clearance with a degree wheel maintaining the minimum clearance on the tightest lobe. That is to say each valve opens at the same time in each cylinder's cycle, not adjusted by minimum clearance alone, but by where it begins to move on the ramp.
Then you're hoping the duration is the same from lobe to lobe.
