RE: IML: water pump pulley diameter?
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RE: IML: water pump pulley diameter?



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?

 

Dan Richardson

300L Family Heirloom

 

 

----- 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.

 

Thanks again Dave

 

-------------- 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.

 

Dan Richardson

300L Family Heirloom

 

 

 

-------------- 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

Dave & Dave:

 

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.

 

Dan Richardson

300L Family Heirloom

 

 

-------------- Original message --------------
From: "Dave Wilker" <wilkerbeast01@xxxxxxxxxxx>

Dan

 

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 -----

To: IML

Sent: Wednesday, December 13, 2006 9:28 AM

Subject: IML: water pump pulley diameter?

 

Hello everyone:

 

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.

 

Dan Richardson

300L Family Heirloom



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