[Fot] TR water pump upgrade

[Alexandre Camoletti]

Dears FOters, re water pump upgrades : I do not think it is necessary, as long as you have a good OEM one. 

My engine is fully prepped and ran an OEM pump with no issues for years. 

I now rebuilt this OEM pump with a new seal, resurfaced the face where the seal spins, cleaned and repacked the bearings with water proof grease and off we go for another 50 years.

 

The problem with the stock repro pumps is that they may have slightly smaller vanes in the impeller (I noticed this on pumps sold by Moss in the 90s). This severely impacts the flow.

And at $30-50 each manufactured overseas you cannot expect much of close tolerances, steel shaft quality, etc.

Increased flow may actually not be an improvement : the greater flow (if it effectively is greater) may create cavitation and /or turbulences and air pockets, thus effectively reducing the cooling. 

I experienced this in a Lotus Esprit engine where the previous owner had increased the speed of the pump by fitting a smaller pulley.

 

And remember : the great Kas Kastner himself was running fully prepped engines with the stock pump (as far as I know).

 

Cheers to all and have a great racing season !

 

Alex Camoletti 

 

(Switzerland, 1959 3A)

 

De : Fot [mailto:fot-bounces at autox.team.net] De la part de Phil Gott via Fot
Envoyé : jeudi 28 avril 2022 12:35
À : fot at autox.team.net; enquiries at roadandtrack.net.au
Objet : Re: [Fot] TR water pump upgrade

 

My own experience has been that some of these "upgraded" pumps such as one sold by Moss use a much smaller stud to hold the pulley on.  Over time, this will break with potentially catastrophic results.  (ask me how I know!)

 

Phil Gott


-----Original Message-----
From: John H. Hasty via Fot <fot at autox.team.net>
To: Enquiries Road & Track <enquiries at roadandtrack.net.au>
Cc: FOT <fot at autox.team.net>
Sent: Wed, Apr 27, 2022 7:10 pm
Subject: Re: [Fot] TR water pump upgrade

Contact Brian Howlett @ BFE

Sent from my iPhone

> On Apr 27, 2022, at 7:02 PM, Enquiries Road & Track via Fot <fot at autox.team.net> wrote:
> 
> 
> does anyone have real-world / hands-on experience with the supposed "upgrade" water pumps that used to be sold for the 4 cyl TR range??. My research suggests some used a different 6 vane impellor that have a taper top, so an insert was used in the pump housing to match this shape. some were just a 6 vane impellor with an otherwise stock pump. 
> 
> thanks
> terry
> Australia
> 
> 
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