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I think a lot of us use a thin copper wire to seal the combustion chamber
when using the shim steel gaskets. The protrusion has to be less for this
than if it was used without the wire. That may make up the difference
between the two recommendations. As we've discussed, I use
Gasgacinch around the water and oil passages on the steel gasket, and it
helps, but isn;t a cure. Although it seems counterintuitive to cut more off
the gasket, the stamped gasket compresses a little and the hope is that we
get the edges all lined up. The steel gaskets will raise compression a
little more than the Lucas or Cometic.
Bob Kramer
On Mon, Dec 23, 2024 at 7:56=E2=80=AFAM fubog1 via Fot <fot@autox.team.net>=
wrote:
> I'm not sure about that spec, .005-.007 proud is for stock gaskets, I use
> .002-.003 for the steel shim gasket, which is all that I use on the race
> engines.
> Any more than .003 & the head won't clamp down good around the oil & wate=
r
> passages, at least that's been my experience.
> Merry Christmas!!!
>
> Glen Efinger
>
> On Monday, December 23, 2024 at 08:02:36 AM EST, Philip Gott via Fot <
> fot@autox.team.net> wrote:
>
>
> Merry Christmas!
> The composite gasket can not be cut back.
> The steel shim gasket can -and must be cut back as you describe. Best to
> err on the side of taking too much off rather then not enough. We have ha=
d
> good luck using (and re-using) these with Hylomar. The cylinder liners
> should protrude above the block .005 to .007 or the seal will be =E2=80=
=9Ciffy.=E2=80=9D
> Phil Gott
>
> Sent from my iPhone
>
> > On Dec 22, 2024, at 11:30=E2=80=AFPM, Greg Blake via Fot <fot@autox.tea=
m.net>
> wrote:
> >
> > =EF=BB=BFSo I=E2=80=99m building my first 89mm motor. Before you flame =
me, it=E2=80=99s a hot
> street motor.
> >
> > The head has been skimmed enough to remove the intake shroud. I have a
> Lucas brand big bore head gasket. It is a composite gasket with a steel
> fire ring. That fire ring hangs into the combustion chamber all around th=
e
> intake valve. I don=E2=80=99t know if that Lucas gasket can be trimmed or=
otherwise
> modified to be able to work with this combination. So that=E2=80=99s ques=
tion one.
> >
> > I also have a bunch of old stock steel shim head gaskets. The pictures
> below are of that gasket sitting on the head on the work bench. You can s=
ee
> it hangs into the combustion chamber as well but only about 0.010=E2=80=
=9D. It=E2=80=99s
> the piece of metal that is inside of the fire ring. It looks like I could
> easily trim that with a flap wheel and have no part of the gasket in the
> combustion chamber. So that=E2=80=99s question number two. Is that the re=
medy for
> the shim steel gasket.
> >
> > Last question. I=E2=80=99ve never used a shim steel. Do I still go for =
3-5 thou
> protrusion and then coat with copper coat?
> >
> > Thanks folks and merry Christmas =F0=9F=8E=81
> >
> > <image0.jpeg>
> > <image1.jpeg>
> > <image2.jpeg>
> >
> >
> >
> > Sent from my iPhone_______________________________________________
> > 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/fo=
t
> > Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/vfracing@aol.com
>
> >
> >
>
> _______________________________________________
> 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
> Unsubscribe/Manage:
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>
>
> _______________________________________________
> 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
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
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>
>
>
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<div dir=3D"ltr"><div>I think a lot of us use a thin copper wire to seal th=
e combustion chamber when using the shim steel gaskets. The protrusion=C2=
=A0has to be less for this than if it was used without the wire. That may m=
ake up the difference between the two recommendations. As we've discuss=
ed, I use Gasgacinch=C2=A0around the water and oil passages on the steel ga=
sket, and it helps, but isn;t a cure. Although it seems counterintuitive to=
cut more off the gasket, the stamped gasket compresses a little and the ho=
pe=C2=A0is that we get the edges all lined up. The steel gaskets will raise=
compression a little more than the Lucas or Cometic.=C2=A0</div><div><br><=
/div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmai=
l_signature"><div dir=3D"ltr">Bob Kramer</div></div></div><br></div><br><di=
v class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gma=
il_attr">On Mon, Dec 23, 2024 at 7:56=E2=80=AFAM fubog1 via Fot <<a href=
=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex"><div><div style=3D"font-fa=
mily:Arial,Helvetica,sans-serif;font-size:16px"><div></div>
<div dir=3D"ltr">I'm not sure about that spec, .005-.007 proud =
is for stock gaskets, I use .002-.003 for the steel shim gasket, which is a=
ll that I use on the race engines.</div><div dir=3D"ltr">Any more than .003=
& the head won't clamp down good around the oil & water passag=
es, at least that's been my experience.</div><div dir=3D"ltr">Merry Chr=
istmas!!!</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Glen Efinger<br>=
</div><div><br></div>
=20
</div><div id=3D"m_-1076709737643410802ydp9943144eyahoo_quoted_5289=
737311"><div style=3D"font-family:Arial,Helvetica,sans-serif;font-size:16px=
">
<div style=3D"font-family:"Helvetica Neue",Helvetica,=
Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
=20
<div>
On Monday, December 23, 2024 at 08:02:36 AM EST, Ph=
ilip Gott via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blan=
k">fot@autox.team.net</a>> wrote:
</div>
</div><div style=3D"font-family:"Helvetica Neue",=
Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42);border-left:1=
px solid rgb(204,204,204);padding-left:8px;margin:0px 0px 0px 8px">
<div><br></div><div><br></div>
<div><div dir=3D"ltr">Merry Christmas!<br clear=3D"none">Th=
e composite gasket can not be cut back.<br clear=3D"none">The steel shim ga=
sket can -and must be cut back as you describe.=C2=A0 Best to err on the si=
de of taking too much off rather then not enough. We have had good luck usi=
ng (and re-using) these with Hylomar.=C2=A0 The cylinder liners should prot=
rude above the block .005 to .007 or the seal will be =E2=80=9Ciffy.=E2=80=
=9D<br clear=3D"none">Phil Gott<br clear=3D"none"><br clear=3D"none">Sent f=
rom my iPhone<br clear=3D"none"><br clear=3D"none">> On Dec 22, 2024, at=
11:30=E2=80=AFPM, Greg Blake via Fot <<a shape=3D"rect" href=3D"mailto:=
fot@autox.team.net" rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</=
a>> wrote:<br clear=3D"none">> <br clear=3D"none">> =EF=BB=BFSo I=
=E2=80=99m building my first 89mm motor. Before you flame me, it=E2=80=99s =
a hot street motor.<br clear=3D"none">> <br clear=3D"none">> The head=
has been skimmed enough to remove the intake shroud. I have a Lucas brand =
big bore head gasket. It is a composite gasket with a steel fire ring. That=
fire ring hangs into the combustion chamber all around the intake valve. I=
don=E2=80=99t know if that Lucas gasket can be trimmed or otherwise modifi=
ed to be able to work with this combination. So that=E2=80=99s question one=
.<br clear=3D"none">> <br clear=3D"none">> I also have a bunch of old=
stock steel shim head gaskets. The pictures below are of that gasket sitti=
ng on the head on the work bench. You can see it hangs into the combustion =
chamber as well but only about 0.010=E2=80=9D. It=E2=80=99s the piece of me=
tal that is inside of the fire ring. It looks like I could easily trim that=
with a flap wheel and have no part of the gasket in the combustion chamber=
. So that=E2=80=99s question number two. Is that the remedy for the shim st=
eel gasket.<br clear=3D"none">> <br clear=3D"none">> Last question. I=
=E2=80=99ve never used a shim steel. Do I still go for 3-5 thou protrusion =
and then coat with copper coat?<br clear=3D"none">> <br clear=3D"none">&=
gt; Thanks folks and merry Christmas =F0=9F=8E=81<br clear=3D"none">> <b=
r clear=3D"none">> <image0.jpeg><br clear=3D"none">> <image1=
.jpeg><br clear=3D"none">> <image2.jpeg><br clear=3D"none">>=
<br clear=3D"none">> <br clear=3D"none">> <br clear=3D"none">> Se=
nt from my iPhone_______________________________________________<br clear=
=3D"none">> <a shape=3D"rect" href=3D"mailto:fot@autox.team.net"; rel=3D"=
nofollow" target=3D"_blank">fot@autox.team.net</a><br clear=3D"none">> <=
br clear=3D"none">> <a shape=3D"rect" href=3D"http://www.fot-racing.com"=
rel=3D"nofollow" target=3D"_blank">http://www.fot-racing.com</a><br clear=
=3D"none">> <br clear=3D"none">> Donate: <a shape=3D"rect" href=3D"ht=
tp://www.team.net/donate.html" rel=3D"nofollow" target=3D"_blank">http://ww=
w.team.net/donate.html</a><br clear=3D"none">> Archive: <a shape=3D"rect=
" href=3D"http://autox.team.net/archive"; rel=3D"nofollow" target=3D"_blank"=
>http://autox.team.net/archive</a> <a shape=3D"rect" href=3D"http://www.tea=
m.net/pipermail/fot" rel=3D"nofollow" target=3D"_blank">http://www.team.net=
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vfracing@aol.com</a><div id=3D"m_-1076709737643410802ydp9943144eyqtfd36684"=
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ar=3D"none">_______________________________________________<br clear=3D"non=
e"><a shape=3D"rect" href=3D"mailto:fot@autox.team.net"; rel=3D"nofollow" ta=
rget=3D"_blank">fot@autox.team.net</a><br clear=3D"none"><br clear=3D"none"=
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r>
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/a><br>
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</blockquote></div>
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