Big block cooling question

-
bigblockplymouth

bigblockplymouth

Member
Joined
Apr 13, 2011
Messages
23
Reaction score
1
Location
colorado
So I have 383 in my valiant and I am having cooling issues when sitting at too many stop lights gets up to 220 I have a new aluminum water pump,new aluminum 2 core radiator with 1" tubes I have a 165 degree thermostat
I've tried a 195 that made it worse so my question is I put a under drive pulley that is 5"in diameter and my aluminum water pump pulley is 6.5"in diameter will that make my antifreeze circulate to slow to cool. any ideas would be appreciated thanks
 
What do you have for a fan and shroud? Sounds like you may have an issue there.
 
bigblockplymouth said:
So I have 383 in my valiant and I am having cooling issues when sitting at too many stop lights gets up to 220 I have a new aluminum water pump,new aluminum 2 core radiator with 1" tubes I have a 165 degree thermostat
I've tried a 195 that made it worse so my question is I put a under drive pulley that is 5"in diameter and my aluminum water pump pulley is 6.5"in diameter will that make my antifreeze circulate to slow to cool. any ideas would be appreciated thanks
Click to expand...



The pump is going WAY too slow. The water pump should be driven at 1:1 at the slowest.
 
yellow rose said:
The pump is going WAY too slow. The water pump should be driven at 1:1 at the slowest.
Click to expand...
I have the same issues, but not as bad. I have the same size pulleys on both the crank and the water pump. A hair bigger crank pulley would speed the water pump up a bit. I`d like to have a single groove 7" pulley for the crank to try.
 
famous bob said:
I have the same issues, but not as bad. I have the same size pulleys on both the crank and the water pump. A hair bigger crank pulley would speed the water pump up a bit. I`d like to have a single groove 7" pulley for the crank to try.
Click to expand...
Am gonna call 440 source to see if they have a bigger aluminum one
 
bigblockplymouth said:
So I have 383 in my valiant and I am having cooling issues when sitting at too many stop lights gets up to 220 I have a new aluminum water pump,new aluminum 2 core radiator with 1" tubes I have a 165 degree thermostat
I've tried a 195 that made it worse so my question is I put a under drive pulley that is 5"in diameter and my aluminum water pump pulley is 6.5"in diameter will that make my antifreeze circulate to slow to cool. any ideas would be appreciated thanks
Click to expand...
What size is your radiator core? Can we assume it is a 26 inch core?
Pulley ratio is critical to cooling system performance.
If you do alot of slow speed cruz'n, stop and go and/or have a overdrive trans you must at least drive the water pump at 1:1 I have over driven big blocks in the past with good results. Even my current 340 pulley setup is over driven.
 
512Stroker said:
What size is your radiator core? Can we assume it is a 26 inch core?
Pulley ratio is critical to cooling system performance.
If you do alot of slow speed cruz'n, stop and go and/or have a overdrive trans you must at least drive the water pump at 1:1 I have over driven big blocks in the past with good results. Even my current 340 pulley setup is over driven.
Click to expand...

Good info. In my case the rad. is a 28x18 , 2 rows of 1 1/4" tubes, crossflow, supposed to cool 800 h.p. . CLOSE BUT NO CIGAR !
 
famous bob said:
Good info. In my case the rad. is a 28x18 , 2 rows of 1 1/4" tubes, crossflow, supposed to cool 800 h.p. . CLOSE BUT NO CIGAR !
Click to expand...
Good deal, thats what I run 1 1/4 cores, 2 rows Griffin I have no cooling issues even with factory A/C. Went for a 30 mile ride yesterday 92 degrees and hi humidity, never got above 180 degree F.
You have the capacity to cool it can only be 2 things not enough air and/or not enough flow.
It is not rocket surgery but sure can be frustrating and expensive.
Good Luck
 
512Stroker said:
What size is your radiator core? Can we assume it is a 26 inch core?
Pulley ratio is critical to cooling system performance.
If you do alot of slow speed cruz'n, stop and go and/or have a overdrive trans you must at least drive the water pump at 1:1 I have over driven big blocks in the past with good results. Even my current 340 pulley setup is over driven.
Click to expand...
28 i i think I'll have to look
 
512Stroker said:
Good deal, thats what I run 1 1/4 cores, 2 rows Griffin I have no cooling issues even with factory A/C. Went for a 30 mile ride yesterday 92 degrees and hi humidity, never got above 180 degree F.
You have the capacity to cool it can only be 2 things not enough air and/or not enough flow.
It is not rocket surgery but sure can be frustrating and expensive.
Good Luck
Click to expand...
Thanks
 
Does it cool well at road/hiway speed?

What's the temp difference between the inlet/outlet "fittings" , not the hose. ?
 
512Stroker said:
Good deal, thats what I run 1 1/4 cores, 2 rows Griffin I have no cooling issues even with factory A/C. Went for a 30 mile ride yesterday 92 degrees and hi humidity, never got above 180 degree F.
You have the capacity to cool it can only be 2 things not enough air and/or not enough flow.
It is not rocket surgery but sure can be frustrating and expensive.
Good Luck
Click to expand...
28x19 instead of 18. I took it out for a short trip to town to fill it up today. The temp was 96, with 57 % humidity, heat index was well over a hundred. Engine warmed up to about 190 and held till I got to the first stop light, went to 202, thru town, topped tank off w/ real 91, temp went to 215, dropped to 212 and stayed there till I got back on the 4 lane, dropped to 206, till I started wasting a smart ***, went up to 208 till I got home. Not bad, but seems like the car runs better around 190 -195.
Still going to try a a clutch fan next, will have a bunch of fans for sale when I get done testing.
Thinking about a flowkooler water pump to, just don`t know if it will be bettr than
the hi volume that's already on there. My 15" pusher in front will run my battery down also. Tempted to take it off and try it w/o it , according to stansblu72 `s suggestion.------------------------AND THE SAGA CONTINUES----------
 
famous bob said:
28x19 instead of 18. I took it out for a short trip to town to fill it up today. The temp was 96, with 57 % humidity, heat index was well over a hundred. Engine warmed up to about 190 and held till I got to the first stop light, went to 202, thru town, topped tank off w/ real 91, temp went to 215, dropped to 212 and stayed there till I got back on the 4 lane, dropped to 206, till I started wasting a smart ***, went up to 208 till I got home. Not bad, but seems like the car runs better around 190 -195.
Still going to try a a clutch fan next, will have a bunch of fans for sale when I get done testing.
Thinking about a flowkooler water pump to, just don`t know if it will be bettr than
the hi volume that's already on there. My 15" pusher in front will run my battery down also. Tempted to take it off and try it w/o it , according to stansblu72 `s suggestion.------------------------AND THE SAGA CONTINUES----------
Click to expand...
Sounds like you got the double whammy going on, the radiator is willing but the other components are lacking.
Air at slow speeds are always a problem, my experience is that electric fans are not the answer. I have had very good performance from the stock 7 blade 18 inch fan/shroud with a heavy duty clutch hub. Make sure you are not sucking the lower radiator hose closed at higher rpm which will cause temps to raise that you will never get back - just keeps getting hotter. Do you run a hi-flow T-stat? What is your current crank to water pump pulley ratio?
There is a big difference when it comes to clutch fans make sure you get the correct one for your application.
 
Last edited:
You must log in or register to reply here.
-

Back
Top