--===============7877385562745268695==
boundary="----=_Part_1566899_1996027102.1638895551368"
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Phil,
Greg Solow provided me with TR3-4 chamber volume numbers and their related =
compression ratios while I was building my TR3 engine. 49.6cc is what I en=
ded up with, an approximate ratio of 10.8:1. Your numbers coincide. I had=
.125" milled off before shaping and opening the chamber to 49.6. =20
Good stuff.
Dave H.=20
> On 12/07/2021 5:31 AM Phil Gott via Fot <fot@autox.team.net> wrote:
>=20
>=20
> If it helps, please find attached an Excel spreadsheet that calculate=
s both the current compression ratio as well as the head volume needed to g=
et the compression ratio you want. Just put the dimensions in the yellow h=
ighlighted cells. If running a pop up piston, you will need to determine t=
he volume of the pup up above the normal piston crown surface. The spreads=
heet as attached has dimensions for a slightly modified TR4 with flat top p=
istons. I hope this is self explanatory.
>=20
> Regards,
>=20
> Phil Gott
>=20
>=20
> -----Original Message-----
> From: Chuck Gee via Fot <fot@autox.team.net>
> To: Bob Bownes -Seiri <bownes@seiri.com>
> Cc: 'Friends of Triumph' Triumph <fot@autox.team.net>
> Sent: Mon, Dec 6, 2021 10:51 pm
> Subject: Re: [Fot] Compression
>=20
> Yes they will, but that isn=E2=80=99t really the problem. The extra =
stroke of the TR6 motor makes building compression easy. The 2L motor is a=
little more challenging because of the shorter stroke. You just can=E2=80=
=99t shave enough off the head to get really high compression without getti=
ng into the water passages. Pop ups are necessary to maximize compression.
>=20
> Chuck
>=20
>=20
> > > On Dec 6, 2021, at 6:40 PM, Bob Bownes -Seiri via Fot <fot@au=
tox.team.net> wrote:
> >=20
> >=20
> > >=20
> > >=20
> >=20
> > >=20
> Hmm,
>=20
> Will a TR6 head fit? There is plenty of meat on those to get Ludicrou=
s Compression.=20
>=20
> Bob
>=20
>=20
> > > On Dec 6, 2021, at 20:58, Scott Janzen via Fot <fot@autox.tea=
m.net> wrote:
> >=20
> >=20
> > >=20
> > >=20
> >=20
> > > I=E2=80=99ve found the GT6 head has some thin spots and depen=
ding on the casting can=E2=80=99t take milling too much more than 11.5 to 1=
, maybe 12 if you get lucky with the right casting. As to the lore that ci=
rcle B heads are the best, I have not found that to be correct in this resp=
ect. Seems like they are all over the map.
> The rest has to come from domed pistons, which I have not yet tried, =
so there=E2=80=99s probably some more HP to be found. =20
> Before you mill a head, find a shop that can =E2=80=9Cxray=E2=80=9D i=
t for you to tell you how thick the metal is above the cooling passages. W=
hen I had this done, they just marked the thickness directly on the head wi=
th a market. If memory serves, one of the thinnest spots is not quite outs=
ide the fire ring on the head gasket near #1. I had one fail there that go=
t milled 50/thousandths too much.
>=20
>=20
>=20
> On Dec 6, 2021, at 1:36 PM, McKearn McKearn via Fot <fot@autox.team.n=
et mailto:fot@autox.team.net > wrote:
>=20
> Now that we have the crank and rods figured out, how about we discuss=
making compression?
> I know this can be a sore subject and everyone has an opinion as to =
how much is enough or too much so where do we start?
> I have built a couple TR6 engines that were in the 13:1 range thanks=
to much head milling and pop up pistons. Will the 2.0 litre engine be the =
same ?
> Thanks. P.J.
> _______________________________________________
> fot@autox.team.net mailto:fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/=
fot
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@me.com
>=20
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/=
fot
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web9.com
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/=
fot
>=20
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22@gmail.com
>=20
>=20
>=20
> _______________________________________________
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>=20
> http://www.fot-racing.com/
>=20
>=20
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http://www.team.net/pipermail/fot
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>=20
>=20
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>=20
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>=20
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@comcast.net
>=20
>=20
>=20
------=_Part_1566899_1996027102.1638895551368
Content-Transfer-Encoding: quoted-printable
<!doctype html>
<html>
<head>=20
<meta charset=3D"UTF-8">=20
</head>
<body>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
color: #333333;">
<span style=3D"font-family: helvetica; font-size: 12pt;">Phil, </span>
<br>
</div>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
color: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Greg Solow prov=
ided me with TR3-4 chamber volume numbers and their related compression rat=
ios while I was building my TR3 engine. 49.6cc is what I ended up wit=
h, an approximate ratio of 10.8:1. Your numbers coincide. I had=
.125" milled off before shaping and opening the chamber to 49.6. &nbs=
p;</span>
</div>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
color: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Good stuff.</sp=
an>
</div>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
color: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Dave H. </=
span>
</div>
<blockquote type=3D"cite">
<div>
On 12/07/2021 5:31 AM Phil Gott via Fot <fot@autox.team.net> wrot=
e:
</div>
<div>
<br>
</div>
<div>
<br>
</div>
<div style=3D"font-size: 10pt; font-family: arial,helvetica,sans-serif; =
color: black;">
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;=
color: black;">
If it helps, please find attached an Excel spreadsheet that calculates=
both the current compression ratio as well as the head volume needed to ge=
t the compression ratio you want. Just put the dimensions in the yell=
ow highlighted cells. If running a pop up piston, you will need to de=
termine the volume of the pup up above the normal piston crown surface. &nb=
sp;The spreadsheet as attached has dimensions for a slightly modified TR4 w=
ith flat top pistons. I hope this is self explanatory.
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;=
color: black;">
<br>
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;=
color: black;">
Regards,
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;=
color: black;">
<br>
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;=
color: black;">
Phil Gott
<br>
<br>
<br>-----Original Message-----
<br>From: Chuck Gee via Fot <fot@autox.team.net>
<br>To: Bob Bownes -Seiri <bownes@seiri.com>
<br>Cc: 'Friends of Triumph' Triumph <fot@autox.team.net>
<br>Sent: Mon, Dec 6, 2021 10:51 pm
<br>Subject: Re: [Fot] Compression
<br>
<br>
</div>
<div id=3D"yiv0152095042">
<div>
Yes they will, but that isn=E2=80=99t really the problem. The e=
xtra stroke of the TR6 motor makes building compression easy. The 2L =
motor is a little more challenging because of the shorter stroke. You=
just can=E2=80=99t shave enough off the head to get really high compressio=
n without getting into the water passages. Pop ups are necessary to m=
aximize compression.
<br clear=3D"none">
<br clear=3D"none">
<div dir=3D"ltr">
Chuck
</div>
<div dir=3D"ltr">
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd41=
027">
<br clear=3D"none">
<blockquote type=3D"cite">
On Dec 6, 2021, at 6:40 PM, Bob Bownes -Seiri via Fot <fot@auto=
x.team.net> wrote:
<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div>
</div>
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd133=
30">
<blockquote type=3D"cite">
<div dir=3D"ltr">
<br>
</div>
</blockquote>
</div>
</div>
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd9710=
7">
<div>
<div dir=3D"ltr">
<br>
</div>
<div dir=3D"ltr">
Hmm,
</div>
<div dir=3D"ltr">
<br clear=3D"none">
</div>
<div dir=3D"ltr">
Will a TR6 head fit? There is plenty of meat on those to get Ludicr=
ous Compression.
</div>
<div dir=3D"ltr">
<br clear=3D"none">
</div>
<div dir=3D"ltr">
Bob
</div>
<div dir=3D"ltr">
<br clear=3D"none">
<blockquote type=3D"cite">
On Dec 6, 2021, at 20:58, Scott Janzen via Fot <fot@autox.team.=
net> wrote:
<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">
<br>
</div>
</blockquote>
</div>
</div>
<div>
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd382=
64">
I=E2=80=99ve found the GT6 head has some thin spots and depending on=
the casting can=E2=80=99t take milling too much more than 11.5 to 1, maybe=
12 if you get lucky with the right casting. As to the lore that circ=
le B heads are the best, I have not found that to be correct in this respec=
t. Seems like they are all over the map.
<div class=3D"yiv0152095042">
The rest has to come from domed pistons, which I have not yet tried=
, so there=E2=80=99s probably some more HP to be found.
</div>
<div class=3D"yiv0152095042">
Before you mill a head, find a shop that can =E2=80=9Cxray=E2=80=9D=
it for you to tell you how thick the metal is above the cooling passages. =
When I had this done, they just marked the thickness directly on the =
head with a market. If memory serves, one of the thinnest spots is no=
t quite outside the fire ring on the head gasket near #1. I had one f=
ail there that got milled 50/thousandths too much.
</div>
<div class=3D"yiv0152095042">
<br class=3D"yiv0152095042" clear=3D"none">
</div>
<div class=3D"yiv0152095042">
<br class=3D"yiv0152095042" clear=3D"none">
<div>
<br class=3D"yiv0152095042" clear=3D"none">
<div class=3D"yiv0152095042">
On Dec 6, 2021, at 1:36 PM, McKearn McKearn via Fot <<a class=
=3D"yiv0152095042" href=3D"mailto:fot@autox.team.net"; target=3D"_blank" sha=
pe=3D"rect" rel=3D"noopener">fot@autox.team.net</a>> wrote:
</div>
<br class=3D"yiv0152095042Apple-interchange-newline" clear=3D"none=
">
<div class=3D"yiv0152095042">
<div class=3D"yiv0152095042" dir=3D"ltr">
Now that we have the crank and rods figured out, how about we di=
scuss making compression?
<div class=3D"yiv0152095042">
I know this can be a sore subject and everyone has an opi=
nion as to how much is enough or too much so where do we start?
</div>
<div class=3D"yiv0152095042">
I have built a couple TR6 engines that were in the 13:1 r=
ange thanks to much head milling and pop up pistons. Will the 2.0 litre eng=
ine be the same ?
</div>
<div class=3D"yiv0152095042">
=
Thank=
s. P.J.
</div>
</div>_______________________________________________
<br class=3D"yiv0152095042" clear=3D"none"><a class=3D"yiv0152095=
042" href=3D"mailto:fot@autox.team.net"; target=3D"_blank" shape=3D"rect" re=
l=3D"noopener">fot@autox.team.net</a>
<br class=3D"yiv0152095042" clear=3D"none">
<br class=3D"yiv0152095042" clear=3D"none">http://www.fot-racing.=
com
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<br class=3D"yiv0152095042" clear=3D"none">Donate: http://www.tea=
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</div>
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</div>_______________________________________________
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--===============7877385562745268695==--
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