Re: Which is the right water pump for my 383 Roadrunner
[Re: 6bblgt]
#1072717
09/10/11 07:17 PM
09/10/11 07:17 PM
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Joined: Jan 2003
Posts: 21,508 N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,508
N.E. OHIO, USA
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Quote:
It's an engineered system (flow/volume/temperature/pressure/etc.), big radiator, higher temp thermostat, you want the water to have a chance to COOL when it's in the radiator not blast thru uncontrollably.
I thought the thermostat determined how long the fluid stayed in the radiator and the pump circulated the fluid through the engine until that time?
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Re: Which is the right water pump for my 383 Roadrunner
[Re: A12]
#1072718
09/10/11 07:49 PM
09/10/11 07:49 PM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Quote:
Are there flow ratings available for the two water pumps? Why does it appear that the A/C pump would flow less than a non-A/C pump, I would think it would be the exact opposite need. I can see that the A/C pump would have less drag or resistance than the non-A/C pump and can understand that would be important because of the increased drag of the A/C system but why such a big difference? What is the flow rate difference between the two??
The AC pump is designed to be overdriven - it spins faster along with the fan. With the higher speed water flow is increased.
Using the AC pump on a non-AC car reduces cooling because the pulley set up does not spin it fast enough.
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Re: Which is the right water pump for my 383 Roadrunner
[Re: Imrare]
#1072719
09/11/11 12:29 AM
09/11/11 12:29 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Use the 8 blader on the R & tack weld an anticav plate behind it (between vanes/pump) & will need to cut a circular piece into 2 pieces (halves) to slip each half behind the vanes then weld them. I suspect you have more of an airflow prob & ;run the smallest WP pulley you can find/tight fitting shroud/MP thermal clutch fan spaced ~2/3 into the shroud/good aftermarket 180 stat tested in a suspended pot of water ahead of time & a 1/16" hole will help elim air pockets/easier filling/3 core rad/unobstructed air flow 2 it
live every 24 hour block of time like it's your last day on earth
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Re: Which is the right water pump for my 383 Roadrunner
[Re: Imrare]
#1072720
09/11/11 12:56 AM
09/11/11 12:56 AM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,095
Valencia, España
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Quote:
I have had a problem with my 383 overheating at idle. I pulled the water pump and realized the pump only has 6 blades on the impeller and is only 3.5" in diameter (A/C pump on a non-A/C car). The service manual states that a non-A/C 383 should have an 8 blade impeller that is 4.3 inches in diameter. I oredered a new water pump from Year-One and it has 8 blades and is 4.3 inches in diameter but when the new pump, on the right, is compared to the old 6 blade impeller pump, on the left (attachment), I noticed the new pump has the impeller reveresed from the old pump. I need help. Which way should the impeller face? Since the engine turns clockwise (when facing from the front) it appears the 8 blade impeller is backwards. Can someone help me on this?
I'm EXACTLY wondering the same in another thread LOL.
Need to take in mind AC cars got smaller pulleys at water pump so spins faster.
I have known 8 blades on smaller pulleys can create cavitation at high rpms
Now, the doubt about blades facing opposite its still on the air
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Which is the right water pump for my 383 Roadrunner
[Re: 6bblgt]
#1072722
09/11/11 10:36 AM
09/11/11 10:36 AM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,095
Valencia, España
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my initial doubt on the earlier thread I made mention was mainly because water pumps remanufacturers locally says where they are faced is important.
of course I don't trust on that or them, so that's why I wondered here
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Which is the right water pump for my 383 Roadrunner
[Re: Imrare]
#1072724
09/11/11 01:33 PM
09/11/11 01:33 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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yes the anticav plate makes the impellers more eff (moves more water) but in your case if an 8 blader does not fix things (& measure the pulley dia while you're at it) then consider airflow. Good luck w it & holler (in this thread if you would) how it turns out
live every 24 hour block of time like it's your last day on earth
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Re: Which is the right water pump for my 383 Roadrunner
[Re: Imrare]
#1072731
09/12/11 01:01 PM
09/12/11 01:01 PM
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Joined: Jan 2003
Posts: 17,516 Las Vegas, NV
6bblgt
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,516
Las Vegas, NV
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Quote:
This whole ordeal doesn't seem like it should be that complicated, I have been assured by two different shops that the radiator is good and if the pump is working properly and there is good "flow", the system has to cool.
Timing (too advanced at idle?) & carb (too lean at idle?) can also affect running temps. What is telling you it is too HOT?
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