<html><head></head><body><div class="ydp9de344a0yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">I just looked at the cam list wow, somebody has spent some time amassing all that data, very cool.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">The BFE 24 cam at the bottom of the page is a monster according to the seat duration alone. In my experience a 327 seat duration is for a super high revving engine like +10,000rpm and probably starts pulling around 7-8000rpm, its way to large for any Triumph motor. Off the top of my head a 6000rpm motor should have a seat duration of around 280ish. Too large of a cam is way worse that too small of a cam. Too large a cam will not pull at lower rpms, too small a cam will stop making power at a certain point but will generally keep making that same power all the way to the end of your parts combo will allow it to go before the power drops off.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Always keep in mind, time is a critical factor for the inlet charge, the higher the rpm's the more duration or time is necessary to charge the cylinder.</div><div><br></div><div class="ydp9de344a0signature"><div style="font-family:Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr">Rick Parent</div><div dir="ltr"><br></div><div dir="ltr">"<i>Doing the right thing is always the right thing, regardless of consequences</i>"</div><div dir="ltr"><br></div></div></div></div>
<div><br></div><div><br></div>
</div><div id="yahoo_quoted_4930677405" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Sunday, January 22, 2023 at 11:29:54 AM MST, Larry Young via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="yiv2177657693"><div>
The numbers for Erson/BFE #24 mentioned by David and Henry is the
last one in my list and has the longest duration. Like Henry said,
if you drop below 4,000 your dead.<br clear="none">
<br clear="none">
I got interested in the history of cam design. According the Speedy
Bill Smith (Speedway Motors) the real innovators after WWII were Ed
Winfield and Collins of Harmon-Collins (see the book "Souping the
Stock Engine). He said their designs were heavily copied by the
others. I think Kas's cams were designed by someone from
Harmon-Collins.<br clear="none">
<br clear="none">
I certainly don't have the experience of many others on this list,
but I'll contribute a few comments on what Rick has said. Cams is a
subject that is mysterious (Rick said "black art") to many, so it is
easy for them to be fooled. There is nothing mysterious about it. I
agree that most people put to much emphasis on peak HP rather than
the entire range you will operate in.<br clear="none">
- Larry <br clear="none">
<br clear="none">
<div id="yiv2177657693yqtfd98426" class="yiv2177657693yqt6818857910"><br clear="none">
On 1/22/2023 6:46 AM, David Gott via Fot wrote:<br clear="none">
<blockquote type="cite">
</blockquote></div></div><div id="yiv2177657693yqtfd81467" class="yiv2177657693yqt6818857910"><div>
Hi FOT,
<div><br clear="none">
</div>
<div>I used Larry Young’s site to learn a lot about cams and their
relative effects on engine performance with some crude engine
modeling software, in the quest to pick the right cam for my
wants, building a strong mid range engine, trying not to spin
over 6,000 if I can help it with a stock based crank. Does
anyone happen to have the specs on the Gillander’s #24 they
could share? Just curious. Maybe it’s at the pointy end of the
list below?</div>
<div><br clear="none">
</div>
<div>Rick McCurdy, here’s the cam reference list Larry put
together, below, and I’d sure be curious what Rick Parent’s
software would say I should have done!!! </div>
<div><br clear="none">
</div>
<div><a rel="nofollow noopener noreferrer" shape="rect" target="_blank" href="https://www.tildentechnologies.com/Cams/TriumphCams.html" class="yiv2177657693enhancr2_B610E089-AE3E-4B7D-8313-E7FFEE78E531">Triumph Cams</a> </div>
<div><br clear="none">
</div>
<br clear="none">
<br clear="none">
</div></div></div><div class="yqt6818857910" id="yqtfd92989">_______________________________________________<br clear="none"><a shape="rect" ymailto="mailto:fot@autox.team.net" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none"><br clear="none"><a shape="rect" href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br clear="none"><br clear="none">Donate: <a shape="rect" href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br clear="none">Archive: <a shape="rect" href="http://autox.team.net/archive " target="_blank">http://autox.team.net/archive </a><a shape="rect" href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/fot</a><br clear="none">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/fot/rick.parent@att.net" target="_blank">http://autox.team.net/mailman/options/fot/rick.parent@att.net</a><br clear="none"><br clear="none"><br clear="none"></div></div>
</div>
</div></body></html>