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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 <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
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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Content-Transfer-Encoding: quoted-printable
<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'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 & 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 "right"=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 <<a href=3D"mailto:fot@au=
tox.team.net">fot@autox.team.net</a>> 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>
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Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
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</blockquote></div>
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