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Yes, the down side to a smaller clearance is that the seat-to-seat
duration and valve overlap will increase causing a loss of the low
end. This page > <a class="moz-txt-link-freetext" href="http://tildentechnologies.com/Cams/Tip_Lash.html">http://tildentechnologies.com/Cams/Tip_Lash.html</a>
shows a case where the duration would increase about 32 degrees to
about 4x86 = 344 degrees. I like to call this the "tuning fork
effect" it sets of all kinds of vibrations which can cause the valve
to jump off the lifter and bounce off the seat at closing. <br>
<br>
I did not intend to imply most smack the lifter, just that many do.
This is a good reason to thoroughly measure your cam profile. Most
stuff on the web talks about valve springs as the only cure for
valve float issues.<br>
- Larry<br>
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<div class="moz-cite-prefix">On 2/20/2020 6:51 PM,
<a class="moz-txt-link-abbreviated" href="mailto:van.mulders.marcel@telenet.be">van.mulders.marcel@telenet.be</a> wrote:<br>
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<div>Larry, you say most camshafts smack the lifters hard. Will
a smaller valve clearance relieve this a bit? Has it
disadvantages to set the clearance smaller than
recommended?(except that the valves will run hotter)</div>
<div>Marcel<br>
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