Subject: Re: [Fot] Compression

From: Bob Bownes -Seiri via Fot <[email-masked]>
Date: Mon, 6 Dec 2021 21:40:01 -0500

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Hmm,

Will a TR6 head fit? There is plenty of meat on those to get Ludicrous Compr=
ession.=20

Bob

> On Dec 6, 2021, at 20:58, Scott Janzen via Fot <[email-masked]> wrote:=

>=20
> =EF=BB=BFI=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, may=
be 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.  S=
eems like they are all over the map.
> The rest has to come from domed pistons, which I have not yet tried, so th=
ere=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 h=
ad this done, they just marked the thickness directly on the head with a mar=
ket.  If memory serves, one of the thinnest spots is not quite outside the f=
ire ring on the head gasket near #1.  I had one fail there that got milled 5=
0/thousandths too much.
>=20
>=20
>=20
> On Dec 6, 2021, at 1:36 PM, McKearn McKearn via Fot <[email-masked]> w=
rote:
>=20
> Now that we have the crank and rods figured out, how about we discuss maki=
ng 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.
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>=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"><div dir=3D"ltr"></div><div dir=3D"ltr">Hmm=
,</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Will a TR6 head fit? Ther=
e is plenty of meat on those to get Ludicrous Compression.&nbsp;</div><div d=
ir=3D"ltr"><br></div><div dir=3D"ltr">Bob</div><div dir=3D"ltr"><br><blockqu=
ote type=3D"cite">On Dec 6, 2021, at 20:58, Scott Janzen via Fot &lt;fot@aut=
ox.team.net&gt; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><=
div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"Content-Type" content=3D"text/h=
tml; charset=3Dutf-8">I=E2=80=99ve found the GT6 head has some thin spots an=
d 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. &nbsp;As to the lo=
re that circle B heads are the best, I have not found that to be correct in t=
his respect. &nbsp;Seems like they are all over the map.<div class=3D"">The r=
est has to come from domed pistons, which I have not yet tried, so there=E2=80=
=99s probably some more HP to be found. &nbsp;</div><div class=3D"">Before y=
ou mill a head, find a shop that can =E2=80=9Cxray=E2=80=9D it for you to te=
ll you how thick the metal is above the cooling passages. &nbsp;When I had t=
his done, they just marked the thickness directly on the head with a market.=
 &nbsp;If memory serves, one of the thinnest spots is not quite outside the f=
ire ring on the head gasket near #1. &nbsp;I had one fail there that got mil=
led 50/thousandths too much.</div><div class=3D""><br class=3D""></div><div c=
lass=3D""><br class=3D""><div><br class=3D""><div class=3D"">On Dec 6, 2021,=
 at 1:36 PM, McKearn McKearn via Fot &lt;<a href=3D"mailto:[email-masked]=
t" class=3D"">[email-masked]</a>&gt; wrote:</div><br class=3D"Apple-inte=
rchange-newline"><div class=3D""><div dir=3D"ltr" class=3D"">Now that we hav=
e the crank and rods figured out, how about we discuss making compression?<d=
iv class=3D"">&nbsp;I know this can be a sore subject and everyone has an op=
inion as to how much is enough or too much so where do we start?</div><div c=
lass=3D"">&nbsp;I have built a couple TR6 engines that were in the 13:1 rang=
e thanks to much head milling and pop up pistons. Will the 2.0 litre engine b=
e the same ?</div><div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; Thanks.&nbsp; P.J.</div></div>
_______________________________________________<br class=3D""><a href=3D"mai=
lto:[email-masked]" class=3D"">[email-masked]</a><br class=3D""><br c=
lass=3D"">http://www.fot-racing.com<br class=3D""><br class=3D"">Donate: htt=
p://www.team.net/donate.html<br class=3D"">Archive: http://autox.team.net/ar=
chive http://www.team.net/pipermail/fot<br class=3D"">Unsubscribe/Manage: ht=
tp://autox.team.net/mailman/options/fot/[email-masked]<br class=3D""><br cla=
ss=3D""><br class=3D""></div></div><br class=3D""></div><span>______________=
_________________________________</span><br><span>[email-masked]</span><=
br><span></span><br><span>http://www.fot-racing.com</span><br><span></span><=
br><span>Donate: http://www.team.net/donate.html</span><br><span>Archive: ht=
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com</span><br><span></span><br><span></span><br></div></blockquote></body></=
html>=

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