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Actually, in my experience the limiting factor in cooling system pressures
was the water pump seal. Carbon seals as used in the 100 are very sensitive
to spring pressure. Increase the pressure and the carbon block wears away
very quickly. The 4 p.s.i. was probably a compromise to achieve adequate
water pump seal life.
M
On Wed., Feb. 23, 2022, 5:08 p.m. WILLIAM B LAWRENCE, <ynotink@msn.com>
wrote:
> Blocking some passages may have been done to balance the cooling between
> hotter and cooler areas in the block. A 4 psi cap was probably considered
> sufficient at the time because the engine was intended to run at a lower
> temperature. Increasing the system pressure raises the coolant boiling
> point, but also increases stress on hoses, gaskets and seals. I think the
> thermostats used were in the 160 degree F range. Under the conditions tha=
t
> were anticipated they probably tried to minimize those stresses for
> warranty reasons. More recent experience says that engines run more
> efficiently at higher temperatures. Most modern engines run at around 210
> degrees F. My 100 runs best with a coolant temperature of about 180 degre=
es
> F. I haven=E2=80=99t experienced any problems in that temperature range a=
lthough if
> it gets anywhere above 190 degrees F it will vapor lock.
> ------------------------------
> *From:* Healeys <healeys-bounces@autox.team.net> on behalf of Michael
> Salter via Healeys <healeys@autox.team.net>
> *Sent:* Wednesday, February 23, 2022 8:22 PM
> *To:* Hank Leach <gradea1@charter.net>
> *Cc:* healeys@autox.team.net <healeys@autox.team.net>; Steven Kingsbury <
> airtightproductions@me.com>
> *Subject:* Re: [Healeys] Head Gasket
>
> For what it's worth, I always have the block skimmed on 100 engine
> rebuilds.
> To date most if not all seem to have a low area between 2 & 3.
> Touch wood, I've yet to encounter head gasket problems or even the very
> common "seepage" issues in the area of the engine number tag.
> Fingers and toes crossed.
>
> M
>
> On Wed., Feb. 23, 2022, 3:02 p.m. Henry G Leach via Healeys, <
> healeys@autox.team.net> wrote:
>
> Has anyone ever stuck a magnet to a Payen *copper* gasket? I did-its a
> steel gasket with a copper coating. There is a real engineering issue wit=
h
> the 2660cc block and I am not sure why it is configured as it is. There m=
ay
> have been a study done on the engine's water flow way back then and some
> modifications made for cooling. It does not add up or make sense, however=
.
>
> So, look at this head and the gasket and then the block. Why are the wate=
r
> passages reduced on the jackets shown? Then too, why is there no passage
> in one area marked that is actually open for water on the head* and*
> gasket? This is one "hot spot" found between 2-3 cylinders when read with=
a
> heat gun.
>
> I was tempted to drill out the opening in the block before re-assembling
> my head, but thought better of it. I would never question engineering
> technology of BMC. Modern day replacements have that same area blocked.
> Never-the-less, can anyone explain this concept to me; the reason for thi=
s
> and a 4lb. radiator cap. This engine needs water, lots of it to keep it
> cool. Why restrict it? Then too, aluminum has its own set of issues that
> may/may not improve the cooling capacity of some old, thick cast iron
> block. Maybe throwing money at it has an effect. Hank
>
> -----------------------------------------
> From: gradea1@charter.net
> To: "Steven Kingsbury"
> Cc: "Healey Mail List"
> Sent: Tuesday February 22 2022 12:23:07PM
> Subject: RE: [Healeys] Head Gasket Woes Part Two
>
> Steven-that's a real heavy piston at .060 (compression ratio 9:1?) Was
> there any defect in head prior to assembly? Magnafluxed? There is an outf=
it
> Midwest Cylinder Head that can repair that for about $500, or else is on =
to
> Denis Welch for about $4K.
>
> I just had my head off and checked-they shaved .003 to get it flat.
> Fingers crossed-head gasket was not blown, but water in oil. I'm hoping i=
t
> was water intrusion from rocker studs. Hank
>
> -----------------------------------------
> From: "Steven Kingsbury via Healeys"
> To: "Healey Mail List"
> Cc:
> Sent: Tuesday February 22 2022 11:28:21AM
> Subject: [Healeys] Head Gasket Woes Part Two
>
> Luckily the pistons weren't frozen, nor the rings in the pistons, but whe=
n
> I turned the head over to inspect, I got the really bad news.
>
> [image: INBOX530788498d9fa86f504913dab139d4d9ef6]
>
> Oh well. I guess some JB Weld might hold!? Ha! Damn it Jim.
> S
> _______________________________________________
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>
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>
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<div dir=3D"auto">Actually,=C2=A0 in my experience the limiting factor in c=
ooling system pressures was the water pump seal. Carbon seals as used in th=
e 100 are very sensitive to spring pressure.=C2=A0 Increase the pressure an=
d the carbon block wears away very quickly. The 4 p.s.i. was probably a com=
promise to achieve adequate water pump seal life.<div dir=3D"auto"><br></di=
v><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Wed., Feb. 23, 2022, 5:08 p.m. WILLIAM B LAWR=
ENCE, <<a href=3D"mailto:ynotink@msn.com";>ynotink@msn.com</a>> wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">
<div>
<div>Blocking some passages may have been done to balance the cooling betwe=
en hotter and cooler areas in the block. A 4 psi cap was probably considere=
d sufficient at the time because the engine was intended to run at a lower =
temperature. Increasing the system
pressure raises the coolant boiling point, but also increases stress on ho=
ses, gaskets and seals. I think the thermostats used were in the 160 degree=
F range. Under the conditions that were anticipated they probably tried to=
minimize those stresses for warranty
reasons. More recent experience says that engines run more efficiently at =
higher temperatures. Most modern engines run at around 210 degrees F. My 10=
0 runs best with a coolant temperature of about 180 degrees F. I haven=E2=
=80=99t experienced any problems in that temperature
range although if it gets anywhere above 190 degrees F it will vapor lock.=
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_3892083218594761819divRplyFwdMsg" dir=3D"ltr"><font face=3D"Ca=
libri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> =
Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_bl=
ank" rel=3D"noreferrer">healeys-bounces@autox.team.net</a>> on behalf of=
Michael Salter via Healeys <<a href=3D"mailto:healeys@autox.team.net"; t=
arget=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>><br>
<b>Sent:</b> Wednesday, February 23, 2022 8:22 PM<br>
<b>To:</b> Hank Leach <<a href=3D"mailto:gradea1@charter.net"; target=3D"=
_blank" rel=3D"noreferrer">gradea1@charter.net</a>><br>
<b>Cc:</b> <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer">healeys@autox.team.net</a> <<a href=3D"mailto:healeys@au=
tox.team.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</=
a>>; Steven Kingsbury <<a href=3D"mailto:airtightproductions@me.com"; =
target=3D"_blank" rel=3D"noreferrer">airtightproductions@me.com</a>><br>
<b>Subject:</b> Re: [Healeys] Head Gasket</font>
<div>=C2=A0</div>
</div>
<div>
<div dir=3D"auto">For what it's worth, I always have the block skimmed =
on 100 engine rebuilds.=C2=A0
<div dir=3D"auto">To date most if not all seem to have a low area between 2=
& 3.</div>
<div dir=3D"auto">Touch wood, I've yet to encounter head gasket problem=
s or even the very common "seepage" issues in the area of the eng=
ine number tag.</div>
<div dir=3D"auto">Fingers and toes crossed.</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">M</div>
</div>
<br>
<div>
<div dir=3D"ltr">On Wed., Feb. 23, 2022, 3:02 p.m. Henry G Leach via Healey=
s, <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"n=
oreferrer">healeys@autox.team.net</a>> wrote:<br>
</div>
<blockquote style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">
<div>Has anyone ever stuck a magnet to a Payen <b>copper</b> gasket? I did-=
its a steel gasket with a copper coating. There is a real engineering issue=
with the 2660cc block and I am not sure why it is configured as it is. The=
re may have been a study done on
the engine's water flow way back then and some modifications made for =
cooling. It does not add up or make sense, however.
<div><br>
</div>
<div>So, look at this head and the gasket and then the block. Why are the w=
ater passages reduced on the jackets shown?=C2=A0 Then too, why is there no=
passage in one area marked that is actually open for water on the head<b> =
and</b> gasket? This is one "hot spot"
found between 2-3 cylinders when read with a heat gun.</div>
<div><br>
</div>
<div>I was tempted to drill out the opening in the block before re-assembli=
ng my head, but thought better of it. I would never question engineering te=
chnology of BMC. Modern day replacements have that same area blocked. Never=
-the-less, can anyone explain this
concept to me; the reason for this and a 4lb. radiator cap. This engine ne=
eds water, lots of it to keep it cool. Why restrict it?=C2=A0 Then too, alu=
minum has its own set of issues that may/may not improve the cooling capaci=
ty of some old, thick cast iron block.
Maybe throwing money at it has an effect.=C2=A0 Hank<br>
<div></div>
<p>-----------------------------------------</p>
From: <a href=3D"mailto:gradea1@charter.net"; rel=3D"noreferrer noreferrer" =
target=3D"_blank">gradea1@charter.net</a><br>
To: "Steven Kingsbury"<br>
Cc: "Healey Mail List"<br>
Sent: Tuesday February 22 2022 12:23:07PM<br>
Subject: RE: [Healeys] Head Gasket Woes Part Two<br>
<br>
Steven-that's a real heavy piston at .060 (compression ratio 9:1?) Was =
there any defect in head prior to assembly? Magnafluxed? There is an outfit=
Midwest Cylinder Head that can repair that for about $500, or else is on t=
o Denis Welch for about $4K.
<div><br>
</div>
<div>I just had my head off and checked-they shaved .003 to get it flat. Fi=
ngers crossed-head gasket was not blown, but water in oil. I'm hoping i=
t was water intrusion from rocker studs. Hank</div>
<div><br>
<div></div>
<p>-----------------------------------------</p>
From: "Steven Kingsbury via Healeys"<br>
To: "Healey Mail List"<br>
Cc:<br>
Sent: Tuesday February 22 2022 11:28:21AM<br>
Subject: [Healeys] Head Gasket Woes Part Two<br>
<br>
<div>Luckily the pistons weren't frozen, nor the rings in the pistons, =
but when I turned the head over to inspect, I got the really bad news.<br>
</div>
<div><br>
</div>
<div><img alt=3D"INBOX530788498d9fa86f504913dab139d4d9ef6" src=3D"http:///i=
ndex.php/inbox/attachment/filenameOriginal/PXL_20220221_213449711.jpg/filen=
amefs/INBOX530788498d9fa86f504913dab139d4d9ef69b"><br>
</div>
<div><br>
</div>
<div>Oh well. I guess some JB Weld might hold!?=C2=A0 Ha! Damn it Jim.<br>
</div>
<div>S</div>
</div>
</div>
</div>
_______________________________________________<br>
rer noreferrer noreferrer" target=3D"_blank">
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Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
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http://www.team.net/pipermail/healeys</a> <a href=3D"http://autox.team.net/=
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http://autox.team.net/archive/healeys</a><br>
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r>
<br>
</blockquote>
</div>
</div>
</div>
</blockquote></div>
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