[Fot] Collective wisdom

[Bob Kramer]

Chuck

I have mine plumbed in from the back of the water pump housing using the
OEM pipe, through the same tank in the same location and flows through to
the back of the head. I have to use at least a 21-23 lb cap on it. I run an
overflow line from the neck to a small catch bottle where the washer bottle
was located. Works great except when it doesn't, and then the
overflow bottle starts spraying smelling water at me.

Bob

On Tue, Jan 20, 2026 at 6:55 PM Tony Drews via Fot <fot at autox.team.net>
wrote:

> I'm not saying it's a good idea or a bad idea, but just be aware that the
> water in the head (and block) is at a higher pressure than the water in the
> radiator.  If you have, say, a 12 psi cap on the header tank and it's
> plumbed to the head it may overflow.
>
> We discovered that on Jack's car when he put a radiator cap on top of the
> thermostat housing so he could fill from the high point.  We ended up
> blocking off the overflow there and just using the one on the radiator
> itself for that purpose.  The radiator cap on the t-stat housing made
> filling the car with water a breeze after that.
>
> Cheers, Tony Drews
> On 1/20/2026 3:19 PM, Michael Moore via Fot wrote:
>
> Chuck, I have mine plumbed the way you mentioned, it really helped with my
> overheating, then added a new radiator last year and now I have no problems.
>
>
>
> Have a Good Day
>
> Mike
>
>
>
> Michael T. Moore, CPA
>
> 3255 West 26th Street
>
> Erie, PA 16506
>
>
>
> Phone:  814-616-8652  ext 100
>
> Fax:        888-865-5279
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> Email:    mmoore at mtmcpafirm.com
>
>
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> *From:* Fot <fot-bounces at autox.team.net> <fot-bounces at autox.team.net> *On
> Behalf Of *Chuck Gee via Fot
> *Sent:* Tuesday, January 20, 2026 3:27 PM
> *To:* of Triumph Friends <fot at autox.team.net> <fot at autox.team.net>
> *Subject:* [Fot] Collective wisdom
>
>
>
> Hello all,
>
> In an effort to constantly improve the car, I’ve been looking at the
> cooling system on my TR4.  It currently has a header tank mounted to the
> firewall that functions as the high spot in the system.  This tank feeds
> the top of the radiator but doesn’t really circulate during operation.
> I’ve been thinking of plumbing the feed off of the back of the head into
> the top of the tank so that it circulates.
>
> Normally this rear head feed is plumbed to the back of the water pump.  In
> an exercise of overthinking, I’m not sure if there will be sufficient
> circulation since the tank is plumbed to the radiator.  Does it matter?
> What is the collective wisdom?
>
> Here are some pictures to help illustrate.
>
> Thanks,
>
> Chuck
>
>
>
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