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The combustion chamber size will need to be bigger to avoid having a compr=
ession ratio of 15:1. OK, maybe a little hyperbolic but the longer stroke n=
eeds a larger chamber.=C2=A0 A friend had issues on his TR250 which turned =
out to be a GT6 head on the 250 block.=C2=A0 Compression was crazy high and=
the intake manifold didn't quite fit.
But I agree with you.=C2=A0 There are quite a few TR6 owners with deep pock=
ets (just ask Rich Good) and an OHC inline 6 is way cool.
=20
Dave=20
=20
=20
-----Original Message-----
From: Greg Lemon <grglmn@gmail.com>
To: Michael Porter <mdporter@dfn.com>
Cc: Triumphs <triumphs@autox.team.net>
Sent: Mon, Sep 2, 2019 11:36 pm
Subject: Re: [TR] Aluminum head?
So will an aluminum cross flow GT6 head fit a 2.5 liter too?=C2=A0 If so th=
e offset bonnet bulge club would like to know which side is intake on?
My work on my high flow cast iron head has kind of stalled out.=C2=A0
Greg LemonTR250
On Mon, Sep 2, 2019, 10:40 PM Michael Porter <mdporter@dfn.com> wrote:
On 9/2/2019 9:11 PM, Wbeech@flash.net wrote:
> Oh wow, my =E2=80=9866 TR4 Motor has an aluminium head, am I doomed?=C2=
=A0 Discovered a water leak after I bought it, bad weld job on the one of c=
hannels in the block that fouled the head seal.=C2=A0 Filed it, fixed it, r=
emember only 70ftlbs on the studs.=C2=A0 ISTR the liners were not as proud =
of the block as some say they should be.
You've probably averted problems because the liners weren't sticking up=20
to spec (especially toward the high side of the tolerance).
It's a curious situation.=C2=A0 The heads aren't wildly popular because of=
=20
the price, so the number of them actually out there is pretty small,=20
relatively speaking.=C2=A0 But, they also might be fairly rare because the=
=20
few people that did buy them couldn't get them to seal and, thinking it=20
was their fault, that there was something special about the product that=20
they didn't understand, and went back to cast-iron heads.
I knew there was at least one person on the list with one, and I think=20
two, because I remember a message maybe a couple of decades ago, in the=20
early days of the list, from someone having trouble getting one to seal=20
properly.
(Not against aluminum heads, at all.=C2=A0 There are advantages to them.=C2=
=A0 I=20
just think, because of the small variability of the figure-eight gaskets=20
and the cylinder heights, that they're probably ill-suited, in the=20
configuration they're being produced, for wet-sleeve engines.=C2=A0 I've be=
en=20
designing, off and on, on a 4-valve OHC head for the GT6 which, now that=20
there's machinable wax available for 3D-printers, can be 3D-printed and=20
investment-cast.)
Cheers.
--=20
Michael Porter
Roswell, NM
Never let anyone drive you crazy when you know it's within walking distance=
....
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<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">The combustion chamber size will need to be bigger t=
o avoid having a compression ratio of 15:1. OK, maybe a little hyperbolic b=
ut the longer stroke needs a larger chamber. A friend had issues on h=
is TR250 which turned out to be a GT6 head on the 250 block. Compress=
ion was crazy high and the intake manifold didn't quite fit.</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">But I agree with you. There are quite a few TR6=
owners with deep pockets (just ask Rich Good) and an OHC inline 6 is way c=
ool.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Greg Lemon <grglmn@gmail.com><br>
To: Michael Porter <mdporter@dfn.com><br>
Cc: Triumphs <triumphs@autox.team.net><br>
Sent: Mon, Sep 2, 2019 11:36 pm<br>
Subject: Re: [TR] Aluminum head?<br>
<br>
<div id=3D"yiv5859829621">
<div>
<div>So will an aluminum cross flow GT6 head fit a 2.5 liter too? If =
so the offset bonnet bulge club would like to know which side is intake on?
<div><br clear=3D"none"></div>
<div>My work on my high flow cast iron head has kind of stalled out. <=
br clear=3D"none">
<div><br clear=3D"none"></div>
<div>Greg Lemon</div>
<div>TR250</div>
<div><br clear=3D"none"></div>
</div>
</div>
<br clear=3D"none">
<div class=3D"yiv5859829621gmail_quote">
<div class=3D"yiv5859829621yqt7283203215" id=3D"yiv5859829621yqtfd21208">
<div class=3D"yiv5859829621gmail_attr" dir=3D"ltr">On Mon, Sep 2, 2019, 10:=
40 PM Michael Porter <<a rel=3D"noopener noreferrer" shape=3D"rect" ymai=
lto=3D"mailto:mdporter@dfn.com"; target=3D"_blank" removedlink__7cfab060-b10=
b-4851-b8b0-0f7bec323e6b__href=3D"mailto:mdporter@dfn.com";>mdporter@dfn.com=
</a>> wrote:<br clear=3D"none"></div>
</div>
<blockquote class=3D"yiv5859829621gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex;">
<div class=3D"yiv5859829621yqt7283203215" id=3D"yiv5859829621yqtfd85832">On=
9/2/2019 9:11 PM, <a rel=3D"noopener noreferrer" shape=3D"rect" ymailto=3D=
"mailto:Wbeech@flash.net"; target=3D"_blank" removedlink__7cfab060-b10b-4851=
-b8b0-0f7bec323e6b__href=3D"mailto:Wbeech@flash.net";>Wbeech@flash.net</a> w=
rote:<br clear=3D"none">
> Oh wow, my =E2=80=9866 TR4 Motor has an aluminium head, am I doomed?&n=
bsp; Discovered a water leak after I bought it, bad weld job on the one of =
channels in the block that fouled the head seal. Filed it, fixed it, =
remember only 70ftlbs on the studs. ISTR the liners were not as proud=
of the block as some say they should be.<br clear=3D"none">
<br clear=3D"none">
You've probably averted problems because the liners weren't sticking up <br=
clear=3D"none">
to spec (especially toward the high side of the tolerance).<br clear=3D"non=
e">
<br clear=3D"none">
It's a curious situation. The heads aren't wildly popular because of =
<br clear=3D"none">
the price, so the number of them actually out there is pretty small, <br cl=
ear=3D"none">
relatively speaking. But, they also might be fairly rare because the =
<br clear=3D"none">
few people that did buy them couldn't get them to seal and, thinking it <br=
clear=3D"none">
was their fault, that there was something special about the product that <b=
r clear=3D"none">
they didn't understand, and went back to cast-iron heads.<br clear=3D"none"=
>
<br clear=3D"none">
I knew there was at least one person on the list with one, and I think <br =
clear=3D"none">
two, because I remember a message maybe a couple of decades ago, in the <br=
clear=3D"none">
early days of the list, from someone having trouble getting one to seal <br=
clear=3D"none">
properly.<br clear=3D"none">
<br clear=3D"none">
(Not against aluminum heads, at all. There are advantages to them.&nb=
sp; I <br clear=3D"none">
just think, because of the small variability of the figure-eight gaskets <b=
r clear=3D"none">
and the cylinder heights, that they're probably ill-suited, in the <br clea=
r=3D"none">
configuration they're being produced, for wet-sleeve engines. I've be=
en <br clear=3D"none">
designing, off and on, on a 4-valve OHC head for the GT6 which, now that <b=
r clear=3D"none">
there's machinable wax available for 3D-printers, can be 3D-printed and <br=
clear=3D"none">
investment-cast.)<br clear=3D"none">
<br clear=3D"none">
<br clear=3D"none">
Cheers.<br clear=3D"none">
<br clear=3D"none">
-- <br clear=3D"none">
<br clear=3D"none">
<br clear=3D"none">
Michael Porter<br clear=3D"none">
Roswell, NM<br clear=3D"none">
<br clear=3D"none">
<br clear=3D"none">
Never let anyone drive you crazy when you know it's within walking distance=
....<br clear=3D"none">
<br clear=3D"none">
</div>
</blockquote></div>
</div>
</div>
<br>
</div>
</div>
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Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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