Re: Running Warm

["Dennis C." <dennis.2914@xxxxxxxxx>]

Hello,

I had overheating problems with my 383.  Just a couple of comments on
what I did to correct my problem.  By the way, I am now doing OK in
Yuma Arizona where it gets very hot.

Try a new thermostat and not a standard one at the local parts store -

 http://www.jegs.com/i/Milodon/697/16400/10002/-1

This is what I use.  If you put it in a pan with a standard stat you
will see how much larger the opening is when it is open.  I like your
idea of drilling holes, I always do that.  It really helps get the air
out and gets a little circulation going as the engine heats up.  I am
running a 180 degree stat.  I don't see a point in a 160 degree.  When
a thermostat is fully open and you are still running above normal it
does not matter what the setting of the stat is - it is fully open!

I went from a 3 row radiator that would not cool to a U.S. 4 row
radiator that solved my problem.  I see that you have a U.S.
Radiator.  My 3 row had been recored but the fin count was too low and
did not transfer enough heat.  The fins I am talking about are the
ones that go between the rows.  Mine that did not work well was about
10 per inch.

A comment was made why not 5 or 6 row radiators.  As stated it gives
more air restriction but if you think about it only the first row sees
outside air temperature, the next sees outside plus heat off of the
1st row and so on.  By the time the air gets to the 4th row it is
seeing hot air from the first 3 and not much heat exchange is getting
done.  Water in the 4th row is coming out of the radiator almost as
hot as it went in.

It is important to get enough flow but too much can also cause
problems.  If the water moves through to tubes too fast it does not
get time to transfer heat.  You have the 4 row radiator so it will
take more flow, the flow will be divided between 4 rows and not just 3
row.

A high flow water pump may help and there may also be a problem with
your existing water pump that a new pump will correct.  Don D. back in
the day when he was on this board always suggested finding a smaller
pulley for the water pump, that increases the speed of the pump.  I
never found the size he was referring to but if you can find a smaller
one might be worth a try.

I would talk to U.S. Radiator and explain the problems you are
having.  You should do well.   The person I worked with was very good
at going through all of the things that can effect cooling.

Personally
I tried everything from a different fan, a shroud to a LARGE electric
fan with little or no improvement.  When I talked to U.S. Radiator I
explained the problem and that the car is in Yuma where during the
summer 110 degrees is a normal day.  I also wanted a copper radiator
that looked stock.  The radiator I got from them was the answer.

I am now running the original fan, no clutch, no shroud and doing very
well.  If you had given the problems you are having and did not
mention the new U.S Radiator I would have suggesting getting one from
them and getting a 4 row.

Good luck, I know the frustration of having an over heating problem.

Take Care
Dennis C.

On Aug 8, 5:44 pm, Bill M <y1topbanan...@xxxxxxxxx> wrote:
> I installed a new and now my Coronet is definitely running warmer than
> it should.
>
> Here's the list...
> 318 Poly, Mild cam, 4-bbl
> New 4-core copper radiator (US Radiator)
> New 180 deg thermostat
> New 16LB cap
>
> No known issue with the water pump.
> 7-blade fan w/ clutch (seems to be working) ~1 inch from the rad.
> No fan shroud
>
> I swapped the previous 3-core radiator out because it was leaking.
> With the 3-core setup (no shroud) it never got as hot as fast as it
> does now. In fact after sitting just a few minutes at a light, this
> 4-core gets as hot as the 3-core rad did on only the hottest days in
> July/August.
>
> I know the lack of a shroud is 1 problem, but I just can't shell out
> $250 +$50 for mounting hardware for it right now.
>
> Considering I basically swapped only the rad, it should be acting
> better than this.
>
> Any thoughts?
>
> Bill M
> 65 Coronet 500 'verthttp://1962to1965mopar.ornocar.com/mmo62008.html
> 73 Dart Sport, 00 Cherokee Sport, 05 Ram 2500 CTD, 4WD, QC, LB, Laramie
> 21 Model T Depot Hack, 92 Accord, 06 Mazda 3

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