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

[warthodson at aol.com]

I can give you a partial answer. The bypass port should be open when the engine coolant is cold & 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 & 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 & insert a blank off sleeve. Removing the T'stat improves flow by removing any restriction to the flow & the blanking sleeve assures that no coolant can bypass the radiator.Gary Hodson  


-----Original Message-----
From: Alan Seigrist <healey.nut at gmail.com>
To: Healey list <Healeys at 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 little bypass port begin?   
What parts of the head does that bypass come in contact with? 

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