IML: Water pump pulley diameter

["Pete Engel" <peter.engel@xxxxxxxxxxx>]

Whatever happened to the list rules about posting in plain text and trimming
your posts.  Have we totally given up?  I'm in digest mode and a lot of my
recent digests have been 80% coding crappola.

Yes Ken you're right, speeding up coolant flow doesn't fix overheating
problems.  When lunkheads are skeptical (not uncommon when you work at a
junkyard) I demonstrate with the torch test.  Wave your hand through an
oxy-acetylene torch flame.  Do it FAST.  No problem because there's not
enough time for heat transfer.  Now ask the customer to wave his hand
through the flame slowly.  No one has taken me up on this yet!

As another poster said, another common misconception/mistake is to remove
the thermostat to "solve" overheating problems.  The cooling system is
design with the restriction provided by the thermostat in mind.  Remove it
and flow increases and may follow wonky paths.  The result is hot spots and
sometimes cracked parts.  Usually heads because that's where the heat is.

Pete in PA



From: "Ken Lang" <ken@xxxxxxxxxxx>
Subject: RE: IML: water pump pulley diameter?
Date: Wed, 13 Dec 2006 17:58:26 -0800


I might be jumping into this one a bit late.  But I recall back when I had a
68 New Yorker (440) with AC that the water pump impeller was different for
AC models verses non-AC models.  I'm sure it had to do with the flow rating.
Oddly enough the one for AC models had a smaller diameter impeller.

That got me to thinking about the theory behind what Chrysler engineers were
doing.  All I could figure was that if you slow down the flow rate it has
more time to spend in the radiator where it can remove the maximum amount of
heat.  If the radiator is sized properly it can remove more heat than the
engine can create in the same amount of time.  Then it becomes the job of
the thermostat to constantly vary the opening and control the flow rate to
the radiator.

I've seen where people have installed high-flow water pumps to deal with
overheating issues only to make it worse.  Coolant must spend enough time in
the radiator so it can remove the heat.  Faster water flow doesn't usually
fix overheating issues.  IMHO




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