Water Pumps??

[62BT409]

'70 RR, 383, w/o A/C & Auto. What is the difference between the water pumps for the car. PT# 2808680 w/o air and PT# 2808681 w/ air? Yesterday had a bit of an over heating situation. I know it can be a few other items but I thought I would research what is at hand.

 

[68 Sport Satellite]

'70 RR, 383, w/o A/C & Auto. What is the difference between the water pumps for the car. PT# 2808680 w/o air and PT# 2808681 w/ air? Yesterday had a bit of an over heating situation. I know it can be a few other items but I thought I would research what is at hand.

Not completely positive for those part #'s, but for my '68 Satellite I had 2 options as well - one was regular or standard flow and one was high flow. If you go to the parts counter and flip the pump in the housing upside down, the high flow design has 8 fins on the impeller. The standard flow only has 6. The housing and nozzle connection locations are the same. Get the 8 fin whenever possible whether you have A/C or not.

 

[696pack]

Not completely positive for those part #'s, but for my '68 Satellite I had 2 options as well - one was regular or standard flow and one was high flow. If you go to the parts counter and flip the pump in the housing upside down, the high flow design has 8 fins on the impeller. The standard flow only has 6. The housing and nozzle connection locations are the same. Get the 8 fin whenever possible whether you have A/C or not.

I could be wrong but i think it is the other way around with the theory that the six holds the coolant in the radiator longer to remove the heat.

Can anyone confirm this?

 

[Photon440]

I could be wrong but i think it is the other way around with the theory that the six holds the coolant in the radiator longer to remove the heat.

Can anyone confirm this?

I believe you're right, and the air conditioned cars had less pump volume for that reason.

 

[62BT409]

I have had an overheating situation with the car on days above 85 degrees in heavy traffic (it's actually the wife's car) but I am the one that does the repairs when I can handle it.
I pulled the radiator and water pump. The pump has 8 fins and the rad has two passes. I am having the rad upgraded to a three pass rad, so know just have to come up with the correct pump. So off to the parts store to look. Here is a page out of the Moper Parts manual.

 

[68 Sport Satellite]

I could be wrong but i think it is the other way around with the theory that the six holds the coolant in the radiator longer to remove the heat.

Can anyone confirm this?

Thanks for the correction on this! They had called the 8-fin "high flow" and I had mistakenly assumed that meant better cooling. The same counter-intuitive thinking holds true for the 4 row aluminum radiators - I have had many people tell me they don't cool near as well as their stock 2 and 3 row rads.

 

[62BT409]

So, researching more in depth, with both parts I mentioned, they each show with 8 fins. so....??? :icon_confused:

 

[68 Sport Satellite]

could one be aluminum housing and one cast iron? Or one is just the pump only and one includes the housing?

 

[62BT409]

68 Sport Satellite
If you asking me....heck if I know. When I googled and researched as far as I could go. They both appear to be cast iron and both with 8 fin.
I hope your asking in general and we can hear from others

 

[69Bee]

Back in the day, you could get the water pump either with or without air. The AC pump had 8 blades for better cooling. The 8 blades moved more water thru the radiator, and faster, to provide better cooling under the heat stresses the AC put on the system. The non-air version only had 6 blades, and obviously didn't work as well.

Now, as for today, they might list two part numbers and listings, but they only make and sell the 8 blade version anymore. So, just get a NEW water pump for a BB Mopar, and you will get an inexpensive aluminum HP water pump for about $35. Oh, and if you want to throw you hard earned money away, you can get the same pump from Mancini or Edelbrock for more than double.

 

[62BT409]

The replacement pump showed up today.......BUT appears to be different in some ways. Here a two phone pictures.

 

[Photon440]

Back in the day, you could get the water pump either with or without air. The AC pump had 8 blades for better cooling. The 8 blades moved more water thru the radiator, and faster, to provide better cooling under the heat stresses the AC put on the system. The non-air version only had 6 blades, and obviously didn't work as well.

Now, as for today, they might list two part numbers and listings, but they only make and sell the 8 blade version anymore. So, just get a NEW water pump for a BB Mopar, and you will get an inexpensive aluminum HP water pump for about $35. Oh, and if you want to throw you hard earned money away, you can get the same pump from Mancini or Edelbrock for more than double.

Although partly correct - there were six and eight blade pumps - the six blade pumps were the ones for air conditioned vehicles except for the 426 hemi, which didn't have air conditioning but still used the six blade pump. Standard engines (except sixes) used the eight blade pump. Fan speeds were higher on A/C cars though.

Year to year differences are probably out there but this is what my service manual lists, at least for 1970.

 

[super-bee_ski]

Looks like the new pump is designed to reduce "cavitation"

 

[62BT409]

Just wondering if the 6 blade is as 696pack said to slow the water down in order to keep the water in the radiator longer along with the pulleys being different.

Here is what I have decided..... I am already having the radiator upgraded to a 3 core over a 2 core and reinstall the pump I took out....because it looks and turns just fine. Then if something is still not correct then it's my bad ;)

I just hope this is helping or going to help others out!

 

[AR67GTX]

Interesting - I just bought a new water pump for my 67 GTX with AC from NAPA while I was having the radiator re-cored. I typically like the quality of NAPA parts. They only had one water pump listing and I went ahead with it. It's a new part. The impeller is deeper but fits in the cavity fine without interference. Guess I'll see how it works in this 100+ deg temp.:angryfire:

 

[Photon440]

Just wondering if the 6 blade is as 696pack said to slow the water down in order to keep the water in the radiator longer along with the pulleys being different.

-edit-

Just a quick thought, if you look back on that page I posted from the shop manual, take a look at the pulley ratios. The A/C cars had fewer blades BUT ran at a much higher speed. Something else to ponder.

-=Photon440=-