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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 circle =
B heads are the best, I have not found that to be correct in this =
respect. 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 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 not =
quite outside the fire ring on the head gasket near #1. I had one fail =
there that got milled 50/thousandths too much.
On Dec 6, 2021, at 1:36 PM, McKearn McKearn via Fot <fot@autox.team.net> =
wrote:
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
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/sjanzen@me.com
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">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 circle B heads are the best, I have not found that to be =
correct in this respect. Seems like they are all over the map.<div =
class=3D"">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"">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 not quite outside the fire ring on =
the head gasket near #1. I had one fail there that got milled =
50/thousandths too much.</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""><div><br class=3D""><div class=3D"">On Dec 6, =
2021, at 1:36 PM, McKearn McKearn via Fot <<a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D"">Now that we have the crank and rods figured out, =
how about we discuss making compression?<div class=3D""> 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?</div><div class=3D""> 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 ?</div><div class=3D""> =
=
Thanks. P.J.</div></div>
_______________________________________________<br class=3D""><a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a><br =
class=3D""><br class=3D"">http://www.fot-racing.com<br class=3D""><br =
class=3D"">Donate: http://www.team.net/donate.html<br class=3D"">Archive: =
http://autox.team.net/archive http://www.team.net/pipermail/fot<br =
class=3D"">Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/sjanzen@me.com<br class=3D""><br=
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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
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