OK. I'm sold. What difference in size pulleys are we talking about? I'm
looking at replacing my stock TR-6 pulley with an aluminum one anyway.
John Price
-----Original Message-----
From: R. Kastner <kaskas@earthlink.net>
To: WEmery7451@aol.com <WEmery7451@aol.com>; mattspit@att.net
<mattspit@att.net>; fot@autox.team.net <fot@autox.team.net>
Date: Saturday, April 21, 2001 10:56 AM
Subject: Re: water pump speeds
>The reason to restrict the flow is to increase or maintain the BLOCK
>PRESSURE. The block pressure is what eleminates the areas of steam pockets
>in the cylidner head that when ignored result in blown head gaskets etc.
>Generally about 25 pounds block pressure is a good spot. You will find
with
>the TR engines that the block pressure goes down as the revs go over 4000
>because the system was designed for street use. Therefore the pressure is
>going down just when you want it to be working the best. The cure is to
SLOW
>down the water pump by reducing the size of the driver pulley or increasing
>the size of the water pump pulley. This will stop the pump from cavitating
>and thus the pressure will stay constant at higher revs. A simple pressure
>gage with a line to the drain cock fitting in the side of the block will
>give you a pressure number. While testing this on the dyno you could watch
>the pressure go from about 15 pounds right down to zero over the rev range
>of 6500. By the way you will also get a nice power increase from this
little
>mod. Fitting Gilmer type belts and pulleys and with a GT-6 engine we had a
>power increse of 8 bhp. After that bit of info we did the same thing to all
>the engines.
>
>----- Original Message -----
>From: <WEmery7451@aol.com>
>To: <mattspit@att.net>; <fot@autox.team.net>
>Sent: Saturday, April 21, 2001 7:13 AM
>Subject: Re: water pump speeds
>
>
>> In a message dated 4/20/01 8:22:23 PM Pacific Daylight Time,
>mattspit@att.net
>> writes:
>>
>> << I remember a discussion on speed of water moving through radiators and
>> whether it is better for it to move slow (more time to exchange) or fast
>> (higher gradient).
>> There is an excellent discussion in June 2001 Circle Track. >>
>>
>> I will have to look for this article in my June issue.
>>
>> There is an optimum flow rate for every radiator -- not too fast and not
>too
>> slow. This rule also holds true for heat exchangers in power plants.
>>
>> The ancient practice for TR-3/4's was to install a restrictor washer in
>place
>> of the thermostat (opening, about the size of a quarter), use about a 15
>psi
>> cap, and eliminate the bypass flow. All of the open areas around the
>> radiator are then shrouded off with sheet metal or aluminum. The
overflow
>is
>> then connected by tubing to the top of a gallon lacquer thinner can
(catch
>> tank with a small vent hole in the top).
>>
>> I am sure that some of the list now have a better system than the one
>above.
>> I hope to eventually get an aluminum radiator.
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