I had a Farmall tractor that I ran 24-7 for 3 weeks at the time powering paddlewheel airator in catfish ponds that didn't even have a water pump on it and while working in stationary position didn't run hot!
Pulley Diameters
- Thread starter 6pk2goDemon
- Start date
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Based on the page from post #21 if you have a 6.5" crank pulley on the engine, than a 5" pulley on the water pump would get you the 1.3:1 ratio Assuming my math is correct. (6.5 / 1.3 = 5)
My 67 273 (no AC) has about 6.125 crank and 6.5 water pump pulley, that is a 0.95:1 ratio (6.125 / 0.95 = 6.47)
Time to hit the wrecking yards!
My 67 273 (no AC) has about 6.125 crank and 6.5 water pump pulley, that is a 0.95:1 ratio (6.125 / 0.95 = 6.47)
Time to hit the wrecking yards!
T'stat is a 180* & checked in a pan of water before installed. Lower hose has spring & running a 17" Mopar clutch fan w/ a shroud. 3 core Mopar radiator.
Anything is possible though...it is a Demon LOL
I like unedumacated guesses....seems like I'm good at those
So when you underdrive the WP, your WP pulley is larger than the crank pulley correct??
I hate this, but am determined to fix it!!!!
Is it a high flow thermostat? That can make a difference.
No, they do not list the diameter for the a/c pulleys...
Princess Valiant
A.K.A. Rainy Day Auto
When you find out that is worth noting, I did a pulley ID thread long time ago but I never touched on a/c because I have never had a car with a complete a/c setup.
It's a standard t'stat from Napa
Yes Rainy & thank you for your thread. I used it for reference too
Pulley ID thread
Lots of trial & error today. A friend brought over a crate of pulleys & the rubik's cube puzzle began to take hold. Thanks much Jim 
Finally tonight found a couple pulleys that may work. I'm looking for input on the better choice ??
I can use a 6 1/2" crank pulley with a 5 3/4" water pump pulley which would be 3/4" difference
or
A 7 1/4" crank pulley with a 5 3/4" water pump pulley which would be 1 1/2" difference
Finally tonight found a couple pulleys that may work. I'm looking for input on the better choice ??
I can use a 6 1/2" crank pulley with a 5 3/4" water pump pulley which would be 3/4" difference
or
A 7 1/4" crank pulley with a 5 3/4" water pump pulley which would be 1 1/2" difference
The 7 1/4 and 5 3/4 gets you ~1.3:1 but that affects the other accessories being driven assuming they are correct with the 6.5" crank pulley now (unless the crank pulley has different sized pulleys on it)
I like the 7 1/4 and 5 3/4 match up. I don't think it will hurt the other accessories one bit.
I'd go with the 6-1/2 and 5-3/4. Incremental change since its not a drastic problem. 13%-ish increase in fan/pump speed is significant I think.
Between that and the shower caps 
I think you'll be summer desert chillin' in no time.
Between that and the shower caps
I think you'll be summer desert chillin' in no time.
How much does an average thermostat flow ?
What I am getting at is if you have a restriction in the flow path that will limit how fast the coolant will flow what good does it do to try to move it faster ? All it will do is create pressure. And if you are running a clutch fan you run the risk of snapping a shaft at high rpmsor throwing a belt.
Is my thinking flawed ?
What I am getting at is if you have a restriction in the flow path that will limit how fast the coolant will flow what good does it do to try to move it faster ? All it will do is create pressure. And if you are running a clutch fan you run the risk of snapping a shaft at high rpmsor throwing a belt.
Is my thinking flawed ?
I dont believe flow is the issue.
Fan wil be moving faster so it will draw more air thru the rad.
Fan wil be moving faster so it will draw more air thru the rad.
The water pump is not a pressure making pump. It is a flow pump. It does not create pressure. It only moves water. C's car has zero overdrive on the fan pulley right now. She lives in Arizona. No way would I not make a change and not make it a significant one, which is why I recommended the larger difference pulleys.
All that being said, 210 isn't over heating anyway, BUT the water pump is SUPPOSED to be over driven with A/C and it's not.
All that being said, 210 isn't over heating anyway, BUT the water pump is SUPPOSED to be over driven with A/C and it's not.
famous bob
mopar misfit
was more than likely a 4 cyl., that didn`t make over 36 h.p. too !
IF THAT !
Ive known the car several years and the climate for decades
13% is a significant change, and makes it overdriven as it should be.
Its not a massive overheating problem, just an irritating and frustrating one.
13% is a significant change, and makes it overdriven as it should be.
Its not a massive overheating problem, just an irritating and frustrating one.
Been working on fitment all day. Decided to stay with the existing 6 1/2" crank pulley, since it will keep the power steering belt setup as was already in use. Can always change the crank pulley to the 7 1/4 if this doesn't work.
This is truly a puzzle with many variables. I appreciate all the input provided
This is truly a puzzle with many variables. I appreciate all the input provided
The car has climbed to 230* with the AC running, but never boiled over. I agree with overdriven & hope this may fix the issue...
Couldn't have said it better myself! I'm hoping that an overdrive pulley on the water pump will help tremendously...
Fingers crossed
I sure hope it does too! Please report back and let us know! I wish you lots of luck!
All belts and accessories are now lined up except for the alternator. I think if we replace the single alternator pulley with a dual pulley, the last piece of the puzzle will fall in place....
From doing some research, the pulley change over is not a piece of cake
We have a puller to get the pulley off, but not sure about installing the new one. Words of advice??
From doing some research, the pulley change over is not a piece of cake
We have a puller to get the pulley off, but not sure about installing the new one. Words of advice??
I'd swap the alternator for one with two shivs
at least for test fitting...you must have an old core lying around...
at least for test fitting...you must have an old core lying around...
Got a crate of alternators lying around ??
Yes, have an old one on the car now for mock up, but my alternator is chrome with a single pulley, so I'd like to use it if possible.
Not currently in a crate, no... but prob enough to fill one
nothing in chrome though, sorry!
not sure but I think the shaft length is different btwn the 1 and 2 groove alt.
nothing in chrome though, sorry!
not sure but I think the shaft length is different btwn the 1 and 2 groove alt.
7 1/4 is always better than 5 3/4
Those pulleys better be clean so someones hand don't get too dirty! LOL
Those pulleys better be clean so someones hand don't get too dirty! LOL
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