Subject: Re: [Fot] Compression

From: Enquiries Road & Track via Fot <[email-masked]>
Date: Tue, 7 Dec 2021 06:00:30 +1000

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CR will be governed to a considerable extent on the fuel you intend to use,
so think about that early on and get comments from others using the same
fuel. As im in Australia, i can't comment on US local fuels or  any race
category regs related to that. Most of our engines run on 98RON unleaded

  there  are various thickness 2000 & 2500 heads all with different cc's in
the combustion chamber, and even more so if you decide to do radical
combustion chamber mods to get more clearance around the valves

we have found that squish plays a significant role in the 2000/2500 engines
and its a lot of experimentation to get it even close to  "right"  mostly,
we try to have the piston crown just above the block, but obviously not
above the gasket line. if you decide to use lumpy top pistons, make sure
you have a distinct squish band on them.

FWIW, I  agree with the various other comments about stock crank, . on our
engine we use a modified BMW harmonic balancer to improve matters over the
stock TR one

Terry

On Tue, Dec 7, 2021 at 4:33 AM McKearn McKearn via Fot <[email-masked]>
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.
> _______________________________________________
> [email-masked]
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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<div dir=3D"ltr"><div>CR will be governed to a considerable extent on the f=
uel you intend to use, so think about that early on and get comments from o=
thers using the same fuel. As im in=C2=A0Australia, i can&#39;t=C2=A0commen=
t on US local fuels or=C2=A0 any race category regs related to that. Most o=
f our engines run on 98RON unleaded<br></div><div><br></div><div>=C2=A0 the=
re=C2=A0 are various thickness 2000 &amp; 2500 heads all with different cc&=
#39;s in the combustion chamber, and even more so if you decide to do radic=
al combustion chamber=C2=A0mods to get more clearance around the valves=C2=
=A0=C2=A0<br></div><div><br></div><div>we have found that squish=C2=A0plays=
 a significant role=C2=A0in the 2000/2500 engines and its a lot of experime=
ntation to get it even close to=C2=A0 &quot;right&quot;=C2=A0 mostly, we tr=
y to have the piston crown=C2=A0just above the block, but obviously not abo=
ve the gasket line. if you decide to use lumpy top pistons, make sure you h=
ave a distinct squish=C2=A0band on them.</div><div><br></div><div>FWIW, I=
=C2=A0 agree with the various other comments about stock crank, . on our en=
gine we use a modified BMW harmonic balancer to improve=C2=A0matters over t=
he stock TR one</div><div><br></div><div>Terry</div><div><br></div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, =
Dec 7, 2021 at 4:33 AM McKearn McKearn via Fot &lt;<a href=3D"mailto:fot@au=
tox.team.net">[email-masked]</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr">Now that we have the cran=
k and rods figured out, how about we discuss making compression?<div>=C2=A0=
I know this can be a sore subject and everyone has an opinion as to how muc=
h is enough or too much so where do we start?</div><div>=C2=A0I have built =
a couple TR6 engines that were in the 13:1 range thanks to much head millin=
g and pop up pistons. Will the 2.0 litre engine be the same ?</div><div>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks.=C2=A0 P.J.<=
/div></div>
_______________________________________________<br>
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</blockquote></div>

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From: Scott Janzen via Fot <[email-masked]>
Date: Mon, 6 Dec 2021 20:58:27 -0500

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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 <[email-masked]> =
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.
_______________________________________________
[email-masked]

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/[email-masked]

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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. &nbsp;As to =
the lore that circle B heads are the best, I have not found that to be =
correct in this respect. &nbsp;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. =
&nbsp;</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. &nbsp;When I had this 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 fire ring on =
the head gasket near #1. &nbsp;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 &lt;<a =
href=3D"mailto:[email-masked]" class=3D"">[email-masked]</a>&gt; =
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"">&nbsp;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"">&nbsp;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"">&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"mailto:[email-masked]" class=3D"">[email-masked]</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 =
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http://autox.team.net/mailman/options/fot/[email-masked]<br class=3D""><br=
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From: Scott Janzen via Fot <[email-masked]>
Date: Mon, 6 Dec 2021 20:59:21 -0500

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Terry, we sill have 110 leaded at the tracks.
Scott

On Dec 6, 2021, at 3:00 PM, Enquiries Road & Track via Fot =
<[email-masked]> wrote:

CR will be governed to a considerable extent on the fuel you intend to =
use, so think about that early on and get comments from others using the =
same fuel. As im in Australia, i can't comment on US local fuels or  any =
race category regs related to that. Most of our engines run on 98RON =
unleaded

  there  are various thickness 2000 & 2500 heads all with different cc's =
in the combustion chamber, and even more so if you decide to do radical =
combustion chamber mods to get more clearance around the valves =20

we have found that squish plays a significant role in the 2000/2500 =
engines and its a lot of experimentation to get it even close to  =
"right"  mostly, we try to have the piston crown just above the block, =
but obviously not above the gasket line. if you decide to use lumpy top =
pistons, make sure you have a distinct squish band on them.

FWIW, I  agree with the various other comments about stock crank, . on =
our engine we use a modified BMW harmonic balancer to improve matters =
over the stock TR one

Terry

On Tue, Dec 7, 2021 at 4:33 AM McKearn McKearn via Fot =

http://www.fot-racing.com <http://www.fot-racing.com/>

<http://www.team.net/donate.html>
Archive: http://autox.team.net/archive <http://autox.team.net/archive> =
http://www.team.net/pipermail/fot
<http://www.team.net/pipermail/fotUnsubscribe/Manage>: =
http://autox.team.net/mailman/options/fot/[email-masked] =
<http://autox.team.net/mailman/options/fot/[email-masked]>

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Terry, we sill have 110 leaded at the tracks.<div =
class=3D"">Scott<br class=3D""><div class=3D""><div><br class=3D""><div =
class=3D"">On Dec 6, 2021, at 3:00 PM, Enquiries Road &amp; Track via =
Fot &lt;<a href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"">CR will be governed to a considerable extent =
on the fuel you intend to use, so think about that early on and get =
comments from others using the same fuel. As im in&nbsp;Australia, i =
can't&nbsp;comment on US local fuels or&nbsp; any race category regs =
related to that. Most of our engines run on 98RON unleaded<br =
class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D"">&nbsp; there&nbsp; are various thickness 2000 &amp; 2500 =
heads all with different cc's in the combustion chamber, and even more =
so if you decide to do radical combustion chamber&nbsp;mods to get more =
clearance around the valves&nbsp;&nbsp;<br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">we have found that =
squish&nbsp;plays a significant role&nbsp;in the 2000/2500 engines and =
its a lot of experimentation to get it even close to&nbsp; "right"&nbsp; =
mostly, we try to have the piston crown&nbsp;just above the block, but =
obviously not above the gasket line. if you decide to use lumpy top =
pistons, make sure you have a distinct squish&nbsp;band on =
them.</div><div class=3D""><br class=3D""></div><div class=3D"">FWIW, =
I&nbsp; agree with the various other comments about stock crank, . on =
our engine we use a modified BMW harmonic balancer to =
improve&nbsp;matters over the stock TR one</div><div class=3D""><br =
class=3D""></div><div class=3D"">Terry</div><div class=3D""><br =
class=3D""></div></div><br class=3D""><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Tue, Dec 7, 2021 at 4:33 AM McKearn =
McKearn via Fot &lt;<a href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><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"">&nbsp;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"">&nbsp;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"">&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"mailto:[email-masked]" target=3D"_blank" =
class=3D"">[email-masked]</a><br class=3D"">
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