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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 > http://tildentechnologies.com/Cams/Tip_Lash.html 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.
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.
 - Larry
On 2/20/2020 6:51 PM, van.mulders.marcel@telenet.be wrote:
>
> 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)
> Marcel
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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>
<br>
<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>
</div>
<blockquote type="cite"
cite="mid:1443903099.102861658.1582246281397.JavaMail.zimbra@telenet.be">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10pt; color: #000000">
<div><br>
</div>
<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>
</div>
</div>
</blockquote>
<br>
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