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Re: Cooling System Acid Test

To: <tigers@autox.team.net>, "Kathy and Erich Coiner"
Subject: Re: Cooling System Acid Test
From: "Tom Witt" <wittsend@jps.net>
Date: Tue, 12 Aug 2003 09:13:43 -0700
  Sounds like you got the job done with the desired results! I am curious
about the water pump. Do you know how much more the Edelbrock flows than a
stock pump (percentage or volume wise). There is interesting information in
the CAT Shop notes that regards using a pump with less impeller blades to
slow down the rate the coolant flows through the radiator. The thought is
that the coolant doesn't get enough time to loose it's heat because it is
going through the radiator too fast and returns to the engine. I have always
considered the thinking ("slow flow") suspect because the rest of the "slow
coolant" is in the block/heads etc. just getting hotter! Your results would
seem to rebuke the thinking behind the "slow flow" position, hence, my
curiosity about the flow rates of the stock vs Edelbrock water pumps. Though
even there, regardless of the flow rates, I would think that the thermostat
opening (or actually restriction there of) might negate any flow increase
with a higher volume pump. I'm probably just thinking too much and should
let real world results speak for themselves, but when I try to follow this
to a logical conclusion I just ......... . Perhaps there are just too many
variables (coolant flow rate, radiator size and ability to disipate heat,
air circulation through the radiator etc.) and any one improvement (in you
case coolent flow) might be capable to compensate for a deficientcy in the
Regards, Tom Witt B9470101

----- Original Message -----
From: Kathy and Erich Coiner <kathy.coiner@gte.net>
To: Tiger List <tigers@autox.team.net>
Sent: Sunday, August 10, 2003 3:03 PM
Subject: Cooling System Acid Test

> Today was a nice hot day in Poway CA (96 F on my patio)
> I took the Tiger out for a spin with my son. When we got back I left the
> idling in the garage.  After 20 minutes the temp was 201; after 30 minutes
> it was 205.
> When the test started the garage was 96F, when it was over the temp was up
> to 100F.  Yes the door was open, and the tail of the car was outside in
> sun.
> I then drove it around the neighborhood for a few minutes and it cooled
> right down.  Less than 3 miles of 25-35 mph with stops had the car back at
> 185.
> I have a thermocouple mounted in the hot tank of the radiator. That is the
> source of my readings. It also confirms that my dash gauge is way more
> accurate than I would ever expect.
> I am declaring victory in my battle against tiger overheating. (I have
> the car for 22 months. So it did not give in easy)
> Now I need to train myself to watch the scenery and not the temp gauge.
> The combo that is working for me is:
> Near stock 260 with 4 barrell and headers.
> 3 row radiator with surge tank connected to the cold tank on the radiator.
> (Available from list member Rob Guera)
> Stock Tiger radiator shroud
> Derale rigid fan 17515
> Water pump pulley from Ford Fairmont. (smaller in diameter, runs fan and
> pump faster)
> LAT hood
> Edelbrock hi flow water pump
> Horn block off plates
> water pipe insulation jacket stuffed between radiator bottom and cross
> member (stops a lot of the hot air that recirculates thru the radiator at
> idle)
> Cut out sheet metal strip that blocks off about 4 rows of the radiator.
> Aluminum air ducting between lower valance and radiator core support. I
> followed the instructions in Steve Laifman's  "Cool it Buddy" article.
> This ducting ensures that any air that enters the front of the car can
> go thru the radiator core.  It also means that any warm air that wants to
> recirculate into the radiator must travel forward to the inlets in the
> valance and not just curl around the bottom of the radiator.
> I can say that the water pump change made the most dramatic difference in
> car.  Without the pump the car would overheat on the freeway and run warm
> stop and go traffic.  The pump was the last thing I did, so I cannot
> on how important all the other pieces of the sytem are.  Without the pump
> nothing works.  With the pump and everything else, I have the problem
> nailed. I leave it to somebody else to figure out if anything I did is not
> worth much.
> Erich
> getting cocky and thinking about A/C

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