Subject: Re: [Fot] Lime Rock - Groups for Fri Qualifying/Practice and Sat Race

From: Mark Cook via Fot <[email-masked]>
Date: Sat, 7 Jun 2025 11:24:58 -0400

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Henry,

Thanks for the info on gearing.  Video was helpful as well for having not
ever driven Lime Rock.

Was looking at the Lime Rock HF43 posted race groups.  Question.  Will we
run in Group 5 as a single group for Friday's practice/qualifying and
Saturday's races as well as the Kastner Cup on Monday?  Or, run in multiple
groups, like they have listed below (TR250/6 2500cc in the 2.5 Litre or Over
2 Litre as example)?   I assume multiple groups except for Monday's event.

Thanks,

Mark Cook

https://limerock.com/events/historic-festival/hf-driver-information/

HF43 Groups and Classes

The following race groups are our tentative run groups:

Group 1 - Mid Century GT / Sportscars Under 2 Litre

    Under 1.3L

    Over 1.3L

Group 5 - Triumph Feature - Kastner Cup

    Triumph Under 1.6L

    Triumph Over 1.6L

    Triumph Over 2.2L

Group 6 - Tin Tops / IMSA RS / Under 2.5 Litre Cars

    Under 1.3L

    Over 1.3L

Group 9 - GT / Sportscars Over 2 Litre / Sports Racing Cars

    GT

    Sportscars

    Sports Racers

 

-----Original Message-----
From: Fot [mailto:[email-masked]] On Behalf Of yellow04 via Fot
Sent: Thursday, June 5, 2025 12:23 PM
To: FOT
Subject: [Fot] Gearing for Lime Rock

If this comes through twice, I apologize. Working through some technical 

difficulties with my mail server.

I have been asked by numerous folks about what rear end gear to run at 

Lime Rock. Several of our guys with a lot more laps at Lime Rock than I 

do have chimed in, thanks everyone for your input. Sometimes a picture 

is worth a thousand words, so here's my input.

https://youtu.be/xIg5KQwM-pw

I clipped a lap from my in-car camera from the 2024 Lime Rock Vintage 

Festival. My tach is plainly visible and I added captions on what I am 

doing with the gearbox. The lap shown is somewhere in the mid-1.05's. 

The camera is one of those Go-Pro knockoffs, so the quality is junk, but 

it got the job done. The sound was cut, if you heard what the camera 

records for sound you would thank me!

The gearing I use in the TR250 is a 4:10 R&P, a Triumph gearbox with 

close ratio gears, a stock Laycock overdrive and I am running on Hoosier 

Speedsters with a diameter of 24.2 inches. My shift point is 6000. This 

example should be easy to reference against your race car assuming you 

are familiar with high school math!

This is the same setup I used in my old TR4 racer and the TR3, except my 

4-cylinder racers use a Moldex crank, Carillos and a cam that ran to 

7000. With the additional revs afforded by the billet bottom end, I 

don't need the overdrive to enhance the top end. Again, it's all in the 

math.

My line through Big Bend and the Uphill are not optimal, but that is a 

conversation for another time.

Watch the tack twitch as I crest the Uphill, you know you did OK when 

you get a little wheelspin there!

Hope this helps.

Henry Frye

KCup chair

860.508.3118

_______________________________________________

[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

http://autox.team.net/mailman/options/fot/[email-masked]

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p =
class=3DMsoPlainText>Henry,<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Thanks =
for the info on gearing.&nbsp; Video was helpful as well for having not =
ever driven Lime Rock.<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Was =
looking at the Lime Rock HF43 posted race groups.&nbsp; Question.&nbsp; =
Will we run in Group 5 as a single group for Friday's =
practice/qualifying and Saturday's races as well as the Kastner Cup on =
Monday?&nbsp; Or, run in multiple groups, like they have listed below =
(TR250/6 2500cc in the 2.5 Litre or Over 2 Litre as example)? =
&nbsp;&nbsp;I assume multiple groups except for Monday&#8217;s =
event.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Thanks,<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Mark =
Cook<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>https://limerock.com/events/historic-festival/hf-dri=
ver-information/<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>HF43 =
Groups and Classes<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>The =
following race groups are our tentative run groups:<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Group =
1 &#8211; Mid Century GT / <b>Sportscars Under 2 =
Litre</b><o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Under =
1.3L<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Over =
1.3L<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Group 5 &#8211; Triumph Feature &#8211; <b>Kastner =
Cup</b><o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Triumph =
Under 1.6L<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; =
Triumph Over 1.6L<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Triumph Over =
2.2L<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Group 6 &#8211; Tin Tops / IMSA RS / <b>Under 2.5 =
Litre Cars</b><o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; =
Under 1.3L<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Over =
1.3L<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Group 9 &#8211; GT / <b>Sportscars Over 2 Litre</b> =
/ Sports Racing Cars<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; GT<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Sportscars<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; Sports Racers<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>-----Original Message-----<br>From: Fot =
[mailto:[email-masked]] On Behalf Of yellow04 via =
Fot<br>Sent: Thursday, June 5, 2025 12:23 PM<br>To: FOT<br>Subject: =
[Fot] Gearing for Lime Rock</p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>If =
this comes through twice, I apologize. Working through some technical =
<o:p></o:p></p><p class=3DMsoPlainText>difficulties with my mail =
server.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>I have been asked by numerous folks about what rear =
end gear to run at <o:p></o:p></p><p class=3DMsoPlainText>Lime Rock. =
Several of our guys with a lot more laps at Lime Rock than I =
<o:p></o:p></p><p class=3DMsoPlainText>do have chimed in, thanks =
everyone for your input. Sometimes a picture <o:p></o:p></p><p =
class=3DMsoPlainText>is worth a thousand words, so here's my =
input.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>https://youtu.be/xIg5KQwM-pw<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>I =
clipped a lap from my in-car camera from the 2024 Lime Rock Vintage =
<o:p></o:p></p><p class=3DMsoPlainText>Festival. My tach is plainly =
visible and I added captions on what I am <o:p></o:p></p><p =
class=3DMsoPlainText>doing with the gearbox. The lap shown is somewhere =
in the mid-1.05's. <o:p></o:p></p><p class=3DMsoPlainText>The camera is =
one of those Go-Pro knockoffs, so the quality is junk, but =
<o:p></o:p></p><p class=3DMsoPlainText>it got the job done. The sound =
was cut, if you heard what the camera <o:p></o:p></p><p =
class=3DMsoPlainText>records for sound you would thank =
me!<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>The gearing I use in the TR250 is a 4:10 R&amp;P, a =
Triumph gearbox with <o:p></o:p></p><p class=3DMsoPlainText>close ratio =
gears, a stock Laycock overdrive and I am running on Hoosier =
<o:p></o:p></p><p class=3DMsoPlainText>Speedsters with a diameter of =
24.2 inches. My shift point is 6000. This <o:p></o:p></p><p =
class=3DMsoPlainText>example should be easy to reference against your =
race car assuming you <o:p></o:p></p><p class=3DMsoPlainText>are =
familiar with high school math!<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>This =
is the same setup I used in my old TR4 racer and the TR3, except my =
<o:p></o:p></p><p class=3DMsoPlainText>4-cylinder racers use a Moldex =
crank, Carillos and a cam that ran to <o:p></o:p></p><p =
class=3DMsoPlainText>7000. With the additional revs afforded by the =
billet bottom end, I <o:p></o:p></p><p class=3DMsoPlainText>don't need =
the overdrive to enhance the top end. Again, it's all in the =
<o:p></o:p></p><p class=3DMsoPlainText>math.<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>My =
line through Big Bend and the Uphill are not optimal, but that is a =
<o:p></o:p></p><p class=3DMsoPlainText>conversation for another =
time.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Watch the tack twitch as I crest the Uphill, you =
know you did OK when <o:p></o:p></p><p class=3DMsoPlainText>you get a =
little wheelspin there!<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Hope =
this helps.<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Henry =
Frye<o:p></o:p></p><p class=3DMsoPlainText>KCup chair<o:p></o:p></p><p =
class=3DMsoPlainText>860.508.3118<o:p></o:p></p><p =
class=3DMsoPlainText>_______________________________________________<o:p>=
</o:p></p><p class=3DMsoPlainText>[email-masked]<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>http://www.fot-racing.com<o:p></o:p></p><p =
class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Donate: =
class=3DMsoPlainText>Archive: http://autox.team.net/archive =
http://www.team.net/pipermail/fot<o:p></o:p></p><p =
class=3DMsoPlainText>Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]<o:p></o:p=
></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p></div></body></html>
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_______________________________________________
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---

From: yellow04 via Fot <[email-masked]>
Date: Sat, 07 Jun 2025 14:08:43 -0400

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Mark, 

At this point, we have 33 cars entered so we intend to run all Triumphs
in the same group. If we get another 10 cars or so, we will be looking
to move some of the slowest and/or fastest cars to appropriate groups. 

The only caveat is cars running on slicks. If someone has no other
option or insists on running slicks, they will be the first to get moved
to the big bore group for all races leading up to the Kastner Cup race,
but we all run together for the Cup on Monday after lunch. 

In a couple weeks I will be focusing heavily on planning our weekend at
Lime Rock, stay tuned for more as it becomes available! 

Cheers 

On 2025-06-07 11:24, Mark Cook wrote:

> Henry, 
> 
> Thanks for the info on gearing.  Video was helpful as well for having not ever driven Lime Rock. 
> 
> Was looking at the Lime Rock HF43 posted race groups.  Question.  Will we run in Group 5 as a single group for Friday's practice/qualifying and Saturday's races as well as the Kastner Cup on Monday?  Or, run in multiple groups, like they have listed below (TR250/6 2500cc in the 2.5 Litre or Over 2 Litre as example)?   I assume multiple groups except for Monday's event. 
> 
> Thanks, 
> 
> Mark Cook 
> 
> Donate: http://www.team.net/donate.html 
> 
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]
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=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
<p>Mark,</p>
<p>At this point, we have 33 cars entered so we intend to run all Triumphs =
in the same group. If we get another 10 cars or so, we will be looking to m=
ove some of the slowest and/or fastest cars to appropriate groups.</p>
<p>The only caveat is cars running on slicks. If someone has no other optio=
n or insists on running slicks, they will be the first to get moved to the =
big bore group for all races leading up to the Kastner Cup race, but we all=
 run together for the Cup on Monday after lunch.</p>
<p>In a couple weeks I will be focusing heavily on planning our weekend at =
Lime Rock, stay tuned for more as it becomes available!</p>
<p>Cheers&nbsp;</p>
<div id=3D"signature">&nbsp;</div>
<p id=3D"reply-intro">On 2025-06-07 11:24, Mark Cook wrote:</p>
<blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2=
px solid; margin: 0">
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<p class=3D"v1MsoPlainText">Henry,</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Thanks for the info on gearing.&nbsp; Video was=
 helpful as well for having not ever driven Lime Rock.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Was looking at the Lime Rock HF43 posted race g=
roups.&nbsp; Question.&nbsp; Will we run in Group 5 as a single group for F=
riday's practice/qualifying and Saturday's races as well as the Kastner Cup=
 on Monday?&nbsp; Or, run in multiple groups, like they have listed below (=
TR250/6 2500cc in the 2.5 Litre or Over 2 Litre as example)? &nbsp;&nbsp;I =
assume multiple groups except for Monday&rsquo;s event.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Thanks,</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Mark Cook</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">https://limerock.com/events/historic-festival/h=
f-driver-information/</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">HF43 Groups and Classes</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">The following race groups are our tentative run=
 groups:</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Group 1 &ndash; Mid Century GT / <strong>Sports=
cars Under 2 Litre</strong></p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Under 1.3L</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Over 1.3L</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Group 5 &ndash; Triumph Feature &ndash; <strong=
>Kastner Cup</strong></p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Triumph Under 1.6L</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Triumph Over 1.6L</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Triumph Over 2.2L</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Group 6 &ndash; Tin Tops / IMSA RS / <strong>Un=
der 2.5 Litre Cars</strong></p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Under 1.3L</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Over 1.3L</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Group 9 &ndash; GT / <strong>Sportscars Over 2 =
Litre</strong> / Sports Racing Cars</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; GT</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Sportscars</p>
<p class=3D"v1MsoPlainText">&nbsp;&nbsp;&nbsp; Sports Racers</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">-----Original Message-----<br />From: Fot [mail=
to:[email-masked]] On Behalf Of yellow04 via Fot<br />Sent: Thu=
rsday, June 5, 2025 12:23 PM<br />To: FOT<br />Subject: [Fot] Gearing for L=
ime Rock</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">If this comes through twice, I apologize. Worki=
ng through some technical</p>
<p class=3D"v1MsoPlainText">difficulties with my mail server.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">I have been asked by numerous folks about what =
rear end gear to run at</p>
<p class=3D"v1MsoPlainText">Lime Rock. Several of our guys with a lot more =
laps at Lime Rock than I</p>
<p class=3D"v1MsoPlainText">do have chimed in, thanks everyone for your inp=
ut. Sometimes a picture</p>
<p class=3D"v1MsoPlainText">is worth a thousand words, so here's my input=
=2E</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">https://youtu.be/xIg5KQwM-pw</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">I clipped a lap from my in-car camera from the =
2024 Lime Rock Vintage</p>
<p class=3D"v1MsoPlainText">Festival. My tach is plainly visible and I adde=
d captions on what I am</p>
<p class=3D"v1MsoPlainText">doing with the gearbox. The lap shown is somewh=
ere in the mid-1.05's.</p>
<p class=3D"v1MsoPlainText">The camera is one of those Go-Pro knockoffs, so=
 the quality is junk, but</p>
<p class=3D"v1MsoPlainText">it got the job done. The sound was cut, if you =
heard what the camera</p>
<p class=3D"v1MsoPlainText">records for sound you would thank me!</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">The gearing I use in the TR250 is a 4:10 R&amp;=
P, a Triumph gearbox with</p>
<p class=3D"v1MsoPlainText">close ratio gears, a stock Laycock overdrive an=
d I am running on Hoosier</p>
<p class=3D"v1MsoPlainText">Speedsters with a diameter of 24.2 inches. My s=
hift point is 6000. This</p>
<p class=3D"v1MsoPlainText">example should be easy to reference against you=
r race car assuming you</p>
<p class=3D"v1MsoPlainText">are familiar with high school math!</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">This is the same setup I used in my old TR4 rac=
er and the TR3, except my</p>
<p class=3D"v1MsoPlainText">4-cylinder racers use a Moldex crank, Carillos =
and a cam that ran to</p>
<p class=3D"v1MsoPlainText">7000. With the additional revs afforded by the =
billet bottom end, I</p>
<p class=3D"v1MsoPlainText">don't need the overdrive to enhance the top end=
=2E Again, it's all in the</p>
<p class=3D"v1MsoPlainText">math.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">My line through Big Bend and the Uphill are not=
 optimal, but that is a</p>
<p class=3D"v1MsoPlainText">conversation for another time.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Watch the tack twitch as I crest the Uphill, yo=
u know you did OK when</p>
<p class=3D"v1MsoPlainText">you get a little wheelspin there!</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Hope this helps.</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Henry Frye</p>
<p class=3D"v1MsoPlainText">KCup chair</p>
<p class=3D"v1MsoPlainText">860.508.3118</p>
<p class=3D"v1MsoPlainText">_______________________________________________=
</p>
<p class=3D"v1MsoPlainText">[email-masked]</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">http://www.fot-racing.com</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
<p class=3D"v1MsoPlainText">Donate: http://www.team.net/donate.html</p>
<p class=3D"v1MsoPlainText">Archive: http://autox.team.net/archive http://w=
ww.team.net/pipermail/fot</p>
<p class=3D"v1MsoPlainText">Unsubscribe/Manage: http://autox.team.net/mailm=
an/options/fot/[email-masked]</p>
<p class=3D"v1MsoPlainText">&nbsp;</p>
</div>
</div>
</div>
</blockquote>
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From: Mark Cook via Fot <[email-masked]>
Date: Sat, 07 Jun 2025 17:12:29 -0400

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