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I just looked at the cam list wow, somebody has spent some time amassing al=
l that data, very cool.
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 r=
evving 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 m=
otor should have a seat duration of around 280ish. Too large of a cam is wa=
y worse that too small of a cam. Too large a cam will not pull at lower rpm=
s, too small a cam will stop making power at a certain point but will gener=
ally 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.
Always keep in mind, time is a critical factor for the inlet charge, the hi=
gher the rpm's the more duration or time is necessary to charge the cylinde=
r.
Rick Parent
"Doing the right thing is always the right thing, regardless of consequence=
s"
=20
On Sunday, January 22, 2023 at 11:29:54 AM MST, Larry Young via Fot <fo=
t@autox.team.net> wrote: =20
=20
The numbers for Erson/BFE #24 mentioned by David and Henry is the last on=
e in my list and has the longest duration. Like Henry said, if you drop bel=
ow 4,000 your dead.
=20
I got interested in the history of cam design. According the Speedy Bill S=
mith (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 d=
esigned by someone from Harmon-Collins.
=20
I certainly don't have the experience of many others on this list, but I'l=
l contribute a few comments on what Rick has said. Cams is a subject that i=
s 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 i=
n.
=C2=A0- Larry=20
=20
=20
On 1/22/2023 6:46 AM, David Gott via Fot wrote:
=20
=20
Hi FOT,=20
I used Larry Young=E2=80=99s site to learn a lot about cams and their rel=
ative effects on engine performance with some crude engine modeling softwar=
e, in the quest to pick the right cam for my wants, building a strong mid r=
ange engine, trying not to spin over 6,000 if I can help it with a stock ba=
sed crank. =C2=A0 =C2=A0Does anyone happen to have the specs on the Gilland=
er=E2=80=99s #24 they could share? =C2=A0Just curious. =C2=A0Maybe it=E2=80=
=99s at the pointy end of the list below?=20
Rick McCurdy, here=E2=80=99s the cam reference list Larry put together, b=
elow, and I=E2=80=99d sure be curious what Rick Parent=E2=80=99s software w=
ould say I should have done!!! =C2=A0=20
Triumph Cams=C2=A0=20
=20
=20
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
tt.net
=20
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<html><head></head><body><div class=3D"ydp9de344a0yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;"><div><div dir=3D"ltr" data-setdir=3D"false">I just looked at the cam lis=
t wow, somebody has spent some time amassing all that data, very cool.</div=
><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-set=
dir=3D"false">The BFE 24 cam at the bottom of the page is a monster accordi=
ng 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 aro=
und 7-8000rpm, its way to large for any Triumph motor. Off the top of my he=
ad 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 pul=
l 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 yo=
ur parts combo will allow it to go before the power drops off.</div><div di=
r=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"f=
alse">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 c=
ylinder.</div><div><br></div><div class=3D"ydp9de344a0signature"><div style=
=3D"font-family:Helvetica, Arial, sans-serif;font-size:16px;"><div dir=3D"l=
tr">Rick Parent</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">"<i>Doing =
the right thing is always the right thing, regardless of consequences</i>"<=
/div><div dir=3D"ltr"><br></div></div></div></div>
<div><br></div><div><br></div>
=20
</div><div id=3D"yahoo_quoted_4930677405" class=3D"yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Sunday, January 22, 2023 at 11:29:54 AM MST, Larry Y=
oung via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"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=3D"none">
<br clear=3D"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=3D"none">
<br clear=3D"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=3D"none">
- Larry <br clear=3D"none">
<br clear=3D"none">
<div id=3D"yiv2177657693yqtfd98426" class=3D"yiv2177657693yqt6818857910=
"><br clear=3D"none">
On 1/22/2023 6:46 AM, David Gott via Fot wrote:<br clear=3D"none">
<blockquote type=3D"cite">
</blockquote></div></div><div id=3D"yiv2177657693yqtfd81467" class=3D=
"yiv2177657693yqt6818857910"><div>
Hi FOT,
<div><br clear=3D"none">
</div>
<div>I used Larry Young=E2=80=99s 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=E2=80=99s #24 they
could share? Just curious. Maybe it=E2=80=99s at the po=
inty end of the
list below?</div>
<div><br clear=3D"none">
</div>
<div>Rick McCurdy, here=E2=80=99s the cam reference list Larry put
together, below, and I=E2=80=99d sure be curious what Rick Parent=
=E2=80=99s
software would say I should have done!!! </div>
<div><br clear=3D"none">
</div>
<div><a rel=3D"nofollow noopener noreferrer" shape=3D"rect" target=3D=
"_blank" href=3D"https://www.tildentechnologies.com/Cams/TriumphCams.html"; =
class=3D"yiv2177657693enhancr2_B610E089-AE3E-4B7D-8313-E7FFEE78E531">Triump=
h Cams</a> </div>
<div><br clear=3D"none">
</div>
<br clear=3D"none">
=20
<br clear=3D"none">
</div></div></div><div class=3D"yqt6818857910" id=3D"yqtfd92989">________=
_______________________________________<br clear=3D"none"><a shape=3D"rect"=
ymailto=3D"mailto:fot@autox.team.net"; href=3D"mailto:fot@autox.team.net";>f=
ot@autox.team.net</a><br clear=3D"none"><br clear=3D"none"><a shape=3D"rect=
" href=3D"http://www.fot-racing.com"; target=3D"_blank">http://www.fot-racin=
g.com</a><br clear=3D"none"><br clear=3D"none">Donate: <a shape=3D"rect" hr=
ef=3D"http://www.team.net/donate.html"; target=3D"_blank">http://www.team.ne=
t/donate.html</a><br clear=3D"none">Archive: <a shape=3D"rect" href=3D"http=
://autox.team.net/archive " target=3D"_blank">http://autox.team.net/archive=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
--===============5994391087011056125==--
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