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Old 05-24-2006, 09:05 AM
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Downhill heating problem

I am running a 392 hemi in my chopped top Stude with Griffin aluminum radiator and 5 speed Tremec transmission, Weiand aluminum bbc water pump. Coming down out of the mountains on a long downhill run, my temperature gauge will climb very high. When I get down and level out the temperature will return to normal. I am using an electric fan and using engine braking to hold speed down. Also, it will run warm when driving slow until I can get out on the highway and shift it into 5th overdrive and slow down my engine speed. Can anyone explain to me what is happening ?? Thanks

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Last edited by bstoelting; 05-24-2006 at 10:09 AM.
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Old 05-24-2006, 09:26 AM
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Are you engine braking?
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Old 05-24-2006, 09:28 AM
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Need some info...
Are you using a shroud?
What type of fan?
How are you slowing the car? Lower gear/lugging the engine? Brakes?
Is the engine idling on the trip down?
Sounds like you have a flow problem through the radiator but any of the above circumstances will effect cooling differently.
Mark
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Old 05-24-2006, 09:49 AM
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bstoelting

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Originally Posted by johnsongrass1
Are you engine braking?
Yes, I am engine braking. Also have 2 electric fans. Thanks, Bruce
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Old 05-24-2006, 11:44 AM
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You said the temperature goes down with a decrease of engine RPM. Perhaps the water pump is spinning too fast and not allowing the radiator to do it's job?
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Old 05-24-2006, 01:36 PM
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Got a thermostat? How many cfm are your fans? Overheating on a long down hill run kinda suggests that the radiator is not exposed to wind. Is the Rad mounted up against the grill? Is there an oil cooler mounted against the radiator core? What size radiator? Is that weiand water pump electric? Is your temp guage known to be good?

http://www.novak-adapt.com/knowledge/cooling.htm

This link is for cooling issues for engine swaps in jeeps but it may point you in the right direction.

Last edited by 56Maynard; 05-24-2006 at 01:43 PM.
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Old 05-24-2006, 02:07 PM
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Novak seems to present some misinformation about the physics of heat transfer as in the following statement:
Faster is seldom better in terms of coolant flow and heat transfer. The coolant needs enough time in the engine to pull the heat out of the block and heads. Likewise, coolant needs enough time in the radiator to shed its accumulated heat before returning to the engine.

You will find better info at the Arrowhead Radiator Service site:

http://www.arrowheadradiator.com/14_...utomobiles.htm

Stewart Components also has some sound info on cooling:

http://www.stewartcomponents.com/Tech_Tips.htm
http://www.stewartcomponents.com/tec...ech_Tips_6.htm
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