[Fot] A cam for Rick
Larry Young
cartravel at pobox.com
Fri Jan 27 09:02:19 MST 2023
Ken has the original CNC ground master, so presumably it is ground from
a copy which will be less accurate. - Larry
On 1/26/2023 10:57 AM, Ken Knight via Fot wrote:
>
> Everyone should be aware this cam is ground on an original TR cam
> core, not a new blank. Ken
>
> *From:* Fot <fot-bounces at autox.team.net> *On Behalf Of *Tony and Annie
> Garmey via Fot
> *Sent:* Sunday, January 22, 2023 3:24 PM
> *To:* Tony Drews <tony at tonydrews.com>
> *Cc:* fot at autox.team.net
> *Subject:* Re: [Fot] A cam for Rick
>
> The Larry young DX cam profile is available at Webb Camshaft,
> Riverside Ca.
>
> I’ve used this profile with a lot of success for multiple clients .
>
> Sent from my iPhone
>
>
>
> On Jan 22, 2023, at 2:58 PM, Tony Drews via Fot
> <fot at autox.team.net> wrote:
>
>
>
> I was going to keep out of this one but am not capable of it. :)
>
> 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.
>
> 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.
>
> 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.
>
> 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.
>
> I'm trying to point out possible "off the shelf" items that don't
> require you to send a profile to a cam grinder...
>
> The Erson ones are hopefully still available from Brian Howlett /
> BFE / www.BritishFrameandEngine.com
> <http://www.BritishFrameandEngine.com>. Not sure who's making the
> Larry Young design ones now.
>
> Cheers, Tony Drews
>
> On 1/22/2023 11:30 AM, Larry Young via Fot wrote:
>
> 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.
>
> 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.
>
> 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.
> - Larry
>
>
> On 1/22/2023 6:46 AM, David Gott via Fot wrote:
>
> Hi FOT,
>
> 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?
>
> 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!!!
>
> Triumph Cams
> <https://www.tildentechnologies.com/Cams/TriumphCams.html>
>
>
>
>
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