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The Larry young DX cam profile is available at Webb Camshaft, Riverside Ca.
<div>I’ve used this profile with a lot of success for multiple clients . <br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Jan 22, 2023, at 2:58 PM, Tony Drews via Fot <fot@autox.team.net> wrote:<br>
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<p>I was going to keep out of this one but am not capable of it. :)</p>
<p>I run Larry's original design cams. I'm not quite sure who is making them now - Ken Knight had some made last go-round. It's fast but not as peaky as the Erson 24 - coming out of a turn at 3000 rpm is fine, 3500 is better, pulls through 6500 RPM, not sure
where it drops off - haven't had the courage to rev that high.</p>
<p>Most of the front runners (to my knowledge at least) run the Erson 24. I ran a modified one of those (experimental) and hated that one because it was even worse at low RPM than the Erson.</p>
<p>We ran an Isky 666 cam early on and it might be more suitable for a less highly stressed engine. It was tractable and pulled through 6000, not sure about higher - I suspect going over 6000 won't be worth it. With a built engine, ported head, all the goodies
it's not as fast / powerful as the Larry or Erson ones.<br>
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<p>The Isky would be easier on the valve train. Larry's profile requires full diameter stock lifters - if you've gone with the GT40 lifters sleeved down it'll wipe the cam. One set of lifters I bought from BPNW they had put a chamfer around the edge to break
the sharp edge and that was enough to wipe a cam too. It's pretty high lift so you need to have your ducks in a row for there not to be spring bind, have the seat pressures right, and consider valves and springs a replaceable wear item. I suspect the same
is true for the Erson 24 grind as well. I believe there's an Erson 23 grind which is less radical that might be an option.</p>
<p>I'm trying to point out possible "off the shelf" items that don't require you to send a profile to a cam grinder...</p>
<p>The Erson ones are hopefully still available from Brian Howlett / BFE / <a class="moz-txt-link-abbreviated" href="http://www.BritishFrameandEngine.com">
www.BritishFrameandEngine.com</a>. Not sure who's making the Larry Young design ones now.<br>
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<p>Cheers, Tony Drews<br>
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<div class="moz-cite-prefix">On 1/22/2023 11:30 AM, Larry Young via Fot wrote:<br>
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<blockquote type="cite" cite="mid:df77402b-9ffa-4593-9265-c2183eaf40f4@pobox.com">
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>
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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>
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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>
- Larry <br>
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On 1/22/2023 6:46 AM, David Gott via Fot wrote:<br>
<blockquote type="cite" cite="mid:1681050315.254591.1674391564068@mail.yahoo.com">
<!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]-->Hi FOT,
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<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>
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<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>
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<div><a href="https://www.tildentechnologies.com/Cams/TriumphCams.html" target="_blank" class="enhancr2_B610E089-AE3E-4B7D-8313-E7FFEE78E531" moz-do-not-send="true">Triumph Cams</a> </div>
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