Cooling problems

-
Ok just have to ask. You have a belt on the water pump.

In your photo it is not in place.

What is the diameter of the water pump pulley and the crank pulley?
 
Dana67Dart said:
Ok just have to ask. You have a belt on the water pump.

In your photo it is not in place.

What is the diameter of the water pump pulley and the crank pulley?
Click to expand...
The belt is off because I took the heads off for inspection. The crank pulley is 5 1/4 and water pump pulley is 4 1/4. The crank pulley is part of the procharger pulley and the 5 1/4 is what it came with. 4 1/4 water pump pulley is the smallest I could find
 
What does the shroud look like?
 
440magcars said:
You can see the top edge in the picture
Click to expand...
Yes, I can but I would like to see how open it is regarding air flow.

Also, although not your problem going down the road, but I can tell you right quick that fan ain't movin HALF the CFMs it needs to to cool at idle. If that shroud isn't open to enough of the core, I'm gonna say air flow is your issue.
 
Could the fan be too close to the radiator?

You're right, the bay is full, lol.

Gotta see a picture of the entire car please!
 
Could it be sucking air somewhere into the cooling system. Does the vehicle produce heat inside through the ducts if not could be air pocket in heater core maybe
 
I had cooling problems that I couldn’t solve for awhile after I did a bunch of changes. Mine had a mechanical clutch fan, so I don’t know if this applies. I made a custom shroud that completely contained the fan. Looked really nice but the car always overheated. I got an oem one that had the fan 1/2 in & 1/2 out of the shroud. All my problems went away.

I am not an expert, but I think that the fan and shroud designs are closely related. If the two are not designed to work together, you might be having problems like I had.

Have you tried measuring the input and output temps of the water going through the radiator? That might tell you if the radiator is working.
 
440magcars said:
5 1/4 is what it came with. 4 1/4 water pump pulley is the smallest I could find
Click to expand...
You might be spinning the pump too fast and cavitating?

Just grabbing for straws.

You could get a glass thermostat riser to watch the flow and thermostat opening etc.
 
Dana67Dart said:
You might be spinning the pump too fast and cavitating?

Just grabbing for straws.

You could get a glass thermostat riser to watch the flow and thermostat opening etc.
Click to expand...
I had a bigger pulley on the water pump before because I thought that maybe it was going to slow so that's why I have the smaller one now.
 
Mike69cuda said:
I had cooling problems that I couldn’t solve for awhile after I did a bunch of changes. Mine had a mechanical clutch fan, so I don’t know if this applies. I made a custom shroud that completely contained the fan. Looked really nice but the car always overheated. I got an oem one that had the fan 1/2 in & 1/2 out of the shroud. All my problems went away.

I am not an expert, but I think that the fan and shroud designs are closely related. If the two are not designed to work together, you might be having problems like I had.

Have you tried measuring the input and output temps of the water going through the radiator? That might tell you if the radiator is working.
Click to expand...
 
You may just not have enough radiator. It's possible.
 
That's something different to check out. I don't have enough room to fo what you did. The pulley for the charger is 1/8 inch away from the shroud.
 
66fyssh said:
Could the fan be too close to the radiator?

You're right, the bay is full, lol.

Gotta see a picture of the entire car please!
Click to expand...

20220430_155157.jpg


20160730_123255.jpg
 
What we know right now
  1. Overheats at idle in 20 minutes, should not do that
  2. Overheats in 5 miles at speed, should not do that
  3. Op had same problem with and with out the shroud, not an airflow problem at speed, might be at idle?
  4. Op did not have the problem with a turbo
  5. Op gutted the thermostat which should have increased water flow
  6. Had closer to 1 to 1 pulley that was thought to be posable cause for overheating, smaller pulley did not fix the problem
  7. Op has a 20 percent overdriven water pump pulley now.
Am I missing anything?


There are two different issues at hand. Seems like the same issue but really it's not.
At idle very little heat should be produced, so a very small radiator should be able to cool the engine all day long assuming the water flow and thermostat and fans are working properly

At speed there is much more heat produced, there is also much more air and water flow. So a properly sized cooling system should be able to handle that situation as long as the thermostat and pump are functioning properly.

So if the cooling system is sized and working properly for speed it can easily cool at idle as long as it has a property sized fan

If the cooling system is undersized for speed AND the fan is undersized for idle then you could have the issue you are having.
 
Dana67Dart said:
What we know right now
  1. Overheats at idle in 20 minutes, should not do that
  2. Overheats in 5 miles at speed, should not do that
  3. Op had same problem with and with out the shroud, not an airflow problem at speed, might be at idle?
  4. Op did not have the problem with a turbo
  5. Op gutted the thermostat which should have increased water flow
  6. Had closer to 1 to 1 pulley that was thought to be posable cause for overheating, smaller pulley did not fix the problem
  7. Op has a 20 percent overdriven water pump pulley now.
Am I missing anything?


There are two different issues at hand. Seems like the same issue but really it's not.
At idle very little heat should be produced, so a very small radiator should be able to cool the engine all day long assuming the water flow and thermostat and fans are working properly

At speed there is much more heat produced, there is also much more air and water flow. So a properly sized cooling system should be able to handle that situation as long as the thermostat and pump are functioning properly.

So if the cooling system is sized and working properly for speed it can easily cool at idle as long as it has a property sized fan

If the cooling system is undersized for speed AND the fan is undersized for idle then you could have the issue you are having.
Click to expand...
I can't get a bigger radiator or fan that I have in it now without seriously modifying the core support!
 
Best I can figure is, the cooling system was on the edge of being able to keep it cool with the turbo and the blower pushed it over the edge. Blowers introduce a lot of heat directly into the engine, unlike a turbo, which is cold on the intake side. Maybe an intercooler?Just spitballin.
 
440magcars said:
I can't get a bigger radiator or fan that I have in it now without seriously modifying the core support!
Click to expand...
Why do you say that? How much room is there between the frame rails? THAT is the determining factor.
 
I would still like to see a better picture of the shroud.
 
RustyRatRod said:
Best I can figure is, the cooling system was on the edge of being able to keep it cool with the turbo and the blower pushed it over the edge. Blowers introduce a lot of heat directly into the engine, unlike a turbo, which is cold on the intake side. Maybe an intercooler?Just spitballin.
Click to expand...
Yeah I was thinking that also so I disconnected the procharger and charge tube and it still does it. Mind boggling!
 
You must log in or register to reply here.
-

Back
Top