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
Ken
67 Crown 4 Dr Ht
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On
Behalf Of Daniel Richardson
Sent: Wednesday, December 13, 2006
5:15 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: water pump
pulley diameter?
Oooops... I've got it now. Smaller pulley = faster
rotation = more water volume = cooler water for AC. That would then mean
that I should NOT use this big pulley with AC. Now I'll need to find the
correct pulley.
Anyone out there have a chance to measure the diameter of an
AC, '67, 440cid, from an Imperial?
----- Original Message -----
Sent: Wednesday,
December 13, 2006 5:29 PM
Subject: Re: IML: water
pump pulley diameter?
Dan, thats smaller pulley On A/C, I'd bet the 65-68 guys have the
same thing, Dan Collins where are you?, I think he has a 67. Anyway, I
think its 5 o'clock someware. Ya'll have a nice day, Dave.
-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
Aha! A smaller pulley on the non-AC water pump - that makes
sense. Thanks for the "theory" behind the engineering.
I still need someone to confirm the water pump pulley diameter on the
AC engine, then I can make a decision, to grind, or not to grind.
-------------- Original message --------------
From: sosmi@xxxxxxxxxxx
Dan, the specs I quoted, are from the 69 Plymouth manual, it's just
about the oldest manual I have left, after the 04 hurricanes, I lost from 68 to
nearly 58, but your question of, Why a smaller pump? Because the pump is
turning faster with the smaller pulley, they reduced the impeller size, to
prevent pump cavitation, but still maintain sufficient water flow. I still think
the pulley was, in the 5+or - range. Dave
-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
Oh boy, sometimes engineering just doesn't make sense!
The water pump pulley is definitely towards the front. With a
1/16" clearance between it and the crank pulley, I would have to remove
the wp pulley to change the power steering belt - that's OK with me.
One would think that having AC would require better cooling.
The FSM confirms a non AC water pump with 4.38" diam. - 10 vanes, and
an AC water pump with 3.67" diam. - 6 vanes. Why, oh why, would
you have a smaller, fewer vaned water pump on a car with AC?
I have a new water pump sitting here that I was planning on installing
(came with the car). It is 4" diam. - 8 vanes. One would
assume that will be OK, no?
Back to the water pump pulley diameter question - anyone have a '67
that they could measure that pulley? Thanks for the help.
-------------- Original message --------------
From: sosmi@xxxxxxxxxxx
Dan, the smaller diameter pulley does turn faster, however the wp
impeller for a/c cars are smaller diameter, and have less blades. A/C
pump 3.5"- 6 vanes, NON A/C 4.38"- 8 vanes, and if I can recall, the
PS pump belt is first to go on . If the WP pulley is too close to the crank
pulley, you'll have to remove it to change belts? Somebody with a 67 could
tell. Dave.
-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx
The grind it down idea will work (and I already came up with that
"dumb idea"), if I need to go that route. I just want to
confirm that a 6 & 1/2" diameter is correct. Smaller diameter
would turn the water pump faster. With AC, I want to be sure of the
measurements.
Other Dave - it is a single pulley, with an idler/tensioner pulley off
on the passenger's side.
-------------- Original message --------------
From: "Dave Wilker" <wilkerbeast01@xxxxxxxxxxx>
One idea (probably a dumb
one) is to take your pretty new pulley to a machine shop and ask them to shave
it down a bit for clearance. It may make a difference if your pulleys are not
perfectly aligned (It might be easier to jump off) but like I said, it is an
option. I have seen a few engines that have very little clearance between the
pulleys, way less than the thickness of the belt, for instance.
David C. Wilker Jr.
USAF (RET)
----- Original Message -----
Sent: Wednesday,
December 13, 2006 9:28 AM
Subject: IML: water pump
pulley diameter?
What is the exact outer diameter of the water pump pulley for a '67
Imperial, 440cid, with AC, single belt?
I spent $80 (too much!) for a new aluminum one (way too
pretty!), that barely doesn't fit. Parts man said it was 6 &
1/2" diameter - it actually measures 6 & 11/16". I think 6
& 1/2" would fit with a clearance on the crank pulley of 1/16"
Do those measurements make sense? Is there really only 1/16"
clearance between the crank pulley & the water pump pulley? Is 6
& 1/2" the correct diameter for the water pump pulley on this engine?
Thanks in advamce for any insight offered.
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