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Glad to hear it!
Sent from my iPhone
> On Dec 7, 2021, at 11:45 AM, DAVE HOGYE <dlhogye@comcast.net> wrote:
>=20
> =EF=BB=BF
> Phil,=20
> 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 calculates b=
oth the current compression ratio as well as the head volume needed to get t=
he compression ratio you want. Just put the dimensions in the yellow highli=
ghted cells. If running a pop up piston, you will need to determine the vol=
ume of the pup up above the normal piston crown surface. The spreadsheet as=
attached has dimensions for a slightly modified TR4 with flat top pistons. =
I hope this is self explanatory.
>>>=20
>>> Regards,
>>>=20
>>> Phil Gott=20
>>>=20
>>>=20
>>> -----Original Message-----=20
>>> From: Chuck Gee via Fot <fot@autox.team.net>=20
>>> To: Bob Bownes -Seiri <bownes@seiri.com>=20
>>> Cc: 'Friends of Triumph' Triumph <fot@autox.team.net>=20
>>> Sent: Mon, Dec 6, 2021 10:51 pm=20
>>> Subject: Re: [Fot] Compression=20
>>>=20
>>> Yes they will, but that isn=E2=80=99t really the problem. The extra str=
oke of the TR6 motor makes building compression easy. The 2L motor is a lit=
tle more challenging because of the shorter stroke. You just can=E2=80=99t s=
have enough off the head to get really high compression without getting into=
the water passages. Pop ups are necessary to maximize compression.=20
>>>=20
>>> Chuck
>>>=20
>>> On Dec 6, 2021, at 6:40 PM, Bob Bownes -Seiri via Fot <fot@autox.team.ne=
t> wrote:=20
>>>=20
>>=20
>>>=20
>>=20
>>=20
>> Hmm,
>>=20
>> Will a TR6 head fit? There is plenty of meat on those to get Ludicrous Co=
mpression.=20
>>=20
>> Bob
>>=20
>>> On Dec 6, 2021, at 20:58, Scott Janzen via Fot <fot@autox.team.net> wrot=
e:=20
>>>=20
>>>=20
>>=20
>> I=E2=80=99ve found the GT6 head has some thin spots and depending on the c=
asting can=E2=80=99t take milling too much more than 11.5 to 1, maybe 12 if y=
ou get lucky with the right casting. As to the lore that circle B heads are=
the best, I have not found that to be correct in this respect. Seems like t=
hey are all over the map.
>> The rest has to come from domed pistons, which I have not yet tried, so t=
here=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 it fo=
r 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 m=
arket. If memory serves, one of the thinnest spots is not quite outside the=
fire ring on the head gasket near #1. I had one fail there that got milled=
50/thousandths too much.
>>=20
>>=20
>>=20
>> On Dec 6, 2021, at 1:36 PM, McKearn McKearn via Fot <fot@autox.team.net> w=
rote:
>>=20
>> Now that we have the crank and rods figured out, how about we discuss mak=
ing compression?
>> I know this can be a sore subject and everyone has an opinion as to how m=
uch 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 m=
uch head milling and pop up pistons. Will the 2.0 litre engine be the same ?=
>> Thanks. P.J.
>> _______________________________________________=20
>> fot@autox.team.net=20
>>=20
>> http://www.fot-racing.com=20
>>=20
>> Donate: http://www.team.net/donate.html=20
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>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/sjanzen@me.=
com=20
>>=20
>>=20
>>=20
>> _______________________________________________=20
>> fot@autox.team.net=20
>>=20
>> http://www.fot-racing.com=20
>>=20
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>>=20
>>=20
>> _______________________________________________=20
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>>=20
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>>=20
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>>=20
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>>=20
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cast.net=20
>>=20
>>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Glad to hear it!<br><br><div dir=3D"ltr">Se=
nt from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Dec=
7, 2021, at 11:45 AM, DAVE HOGYE <dlhogye@comcast.net> wrote:<br><br>=
</blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
=20
<meta charset=3D"UTF-8">=20
=20
=20
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; c=
olor: #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; c=
olor: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Greg Solow provi=
ded me with TR3-4 chamber volume numbers and their related compression ratio=
s while I was building my TR3 engine. 49.6cc is what I ended up with, a=
n approximate ratio of 10.8:1. Your numbers coincide. I had .125=
" milled off before shaping and opening the chamber to 49.6. </sp=
an>
</div>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; c=
olor: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Good stuff.</spa=
n>
</div>
<div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; c=
olor: #333333;" class=3D"default-style">
<span style=3D"font-family: helvetica; font-size: 12pt;">Dave H. </s=
pan>
</div>
<blockquote type=3D"cite">
<div>
On 12/07/2021 5:31 AM Phil Gott via Fot <fot@autox.team.net> wrote=
:
</div>
<div>
<br>
</div>
<div>
<br>
</div>
<div style=3D"font-size: 10pt; font-family: arial,helvetica,sans-serif; c=
olor: black;">
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt; c=
olor: black;">
If it helps, please find attached an Excel spreadsheet that calculates b=
oth the current compression ratio as well as the head volume needed to get t=
he compression ratio you want. Just put the dimensions in the yellow h=
ighlighted cells. If running a pop up piston, you will need to determi=
ne the volume of the pup up above the normal piston crown surface. The=
spreadsheet as attached has dimensions for a slightly modified TR4 with fla=
t top pistons. I hope this is self explanatory.
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt; c=
olor: black;">
<br>
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt; c=
olor: black;">
Regards,
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt; c=
olor: black;">
<br>
</div>
<div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt; c=
olor: 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 ex=
tra stroke of the TR6 motor makes building compression easy. The 2L mo=
tor is a little more challenging because of the shorter stroke. You ju=
st can=E2=80=99t shave enough off the head to get really high compression wi=
thout getting into the water passages. Pop ups are necessary to maximi=
ze 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"yiv0152095042yqtfd410=
27">
<br clear=3D"none">
<blockquote type=3D"cite">
On Dec 6, 2021, at 6:40 PM, Bob Bownes -Seiri via Fot <fot@autox=
.team.net> wrote:
<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div>
</div>
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd1333=
0">
<blockquote type=3D"cite">
<div dir=3D"ltr">
<br>
</div>
</blockquote>
</div>
</div>
<div class=3D"yiv0152095042yqt5940126276" id=3D"yiv0152095042yqtfd97107=
">
<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 Ludicro=
us 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.n=
et> 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"yiv0152095042yqtfd3826=
4">
I=E2=80=99ve found the GT6 head has some thin spots and depending on t=
he 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 circle B=
heads are the best, I have not found that to be correct in this respect. &n=
bsp;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 i=
t for you to tell you how thick the metal is above the cooling passages. &nb=
sp;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 not qui=
te outside the fire ring on the head gasket near #1. I had one fail th=
ere 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" shape=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 dis=
cuss making compression?
<div class=3D"yiv0152095042">
I know this can be a sore subject and everyone has an opin=
ion 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 ra=
nge thanks to much head milling and pop up pistons. Will the 2.0 litre engin=
e be the same ?
</div>
<div class=3D"yiv0152095042">
&=
nbsp; Thanks.=
P.J.
</div>
</div>_______________________________________________
<br class=3D"yiv0152095042" clear=3D"none"><a class=3D"yiv01520950=
42" href=3D"mailto:fot@autox.team.net"; target=3D"_blank" shape=3D"rect" rel=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.c=
om
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<br class=3D"yiv0152095042" clear=3D"none">
</div>_______________________________________________
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_______________________________________________
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=20
</div></blockquote></body></html>=
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