Re: [Healeys] Coolant bypass port in the head - 6-cyl

[warthodson--- via Healeys <healeys@autox.team.net>]

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I can give you a partial answer. The bypass port should be open when the en=
gine coolant is cold & closed when it is hot. The idea is that when the coo=
lant is cool it warms up faster if some of it bypasses the radiator & is re=
turned directly to the head to get heated up. When the coolant is hot all t=
he coolant should go to the radiator, so the bypass is blocked. Racing cars=
 sometimes remote the T'stat & insert a blank off sleeve. Removing the T'st=
at improves flow by removing any restriction to the flow & the blanking sle=
eve assures that no coolant can bypass the radiator.Gary Hodson=C2=A0=C2=A0


-----Original Message-----
From: Alan Seigrist <healey.nut@gmail.com>
To: Healey list <Healeys@autox.team.net>
Sent: Tue, Mar 29, 2022 9:46 am
Subject: [Healeys] Coolant bypass port in the head - 6-cyl

I don't know if this has ever been answered before, but where does the litt=
le bypass port begin?=C2=A0 =C2=A0
What parts of the head does that bypass come in contact with?=C2=A0

When do you want to cover the port with a sleeve (when coolant is hot or co=
ld?)
I ask because the old bellows style thermostat will cover the bypass port w=
hen the thermostat opens

then I have another wax thermostat and the sleeve actually cover the bypass=
 when it is cold, and doesn't cover it when the thermostat opens.... so it =
works exact opposite to the old bellows style thermostat.
confused....

Cheers,
Alan_______________________________________________

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<div style="color:black;font: 12pt Comic Sans MS, sans-serif;">I can give you a 
partial answer. The bypass port should be open when the engine coolant is cold 
&amp; closed when it is hot. The idea is that when the coolant is cool it warms 
up faster if some of it bypasses the radiator &amp; is returned directly to the 
head to get heated up. When the coolant is hot all the coolant should go to the 
radiator, so the bypass is blocked. Racing cars sometimes remote the T'stat 
&amp; insert a blank off sleeve. Removing the T'stat improves flow by removing 
any restriction to the flow &amp; the blanking sleeve assures that no coolant 
can bypass the radiator.
<div>Gary Hodson&nbsp;&nbsp;<br>
<br>
<br>

<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font 
size="2">-----Original Message-----<br>
From: Alan Seigrist &lt;healey.nut@gmail.com&gt;<br>
To: Healey list &lt;Healeys@autox.team.net&gt;<br>
Sent: Tue, Mar 29, 2022 9:46 am<br>
Subject: [Healeys] Coolant bypass port in the head - 6-cyl<br>
<br>

<div id="yiv3894348553">
<div dir="ltr">I don't know if this has ever been answered before, but where 
does the little bypass port begin?&nbsp; &nbsp;
<div><br>
</div>

<div>What parts of the head does that bypass come in contact with?&nbsp;<br>
<br>
When do you want to cover the port with a sleeve (when coolant is hot or 
cold?)</div>

<div><br>
</div>

<div>I ask because the old bellows style thermostat will cover the bypass port 
when the thermostat opens<br>
<br>
then I have another wax thermostat and the sleeve actually cover the bypass 
when it is cold, and doesn't cover it when the thermostat opens.... so it works 
exact opposite to the old bellows style thermostat.</div>

<div><br>
</div>

<div>confused....<br>
<br>
Cheers,</div>

<div><br>
</div>

<div>Alan</div>
</div>

</div>
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