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Joined: Dec 2010
Posts: 6
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2010
Posts: 6 |
Hey Guys,
I have a 57 chevy that overheats only at highway speeds. It has a 75 350 small block with new griffin radiator with 2 10" electric fans (no engine fan) 180hi flow thermostat..idles at 185/195 degrees on a 95 degree day for hours with the a/c on but when I hit the highway at 60/65 she overheats to 220,30,40 and higher until I turn off the a/c then goes to 220. Iam thinking to put a 16" pusher fan in front of the condensor to turn on when the a/c is on and cut some holes in the shroud and put rubber flaps in that open when with higher speeds.
please if anybody can solve this problem...let me know!!!!
thanks!!!
Johnny 57
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Jan 2006
Posts: 418
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2006
Posts: 418 |
I have a good friend who just finished up on a complete '55 re-do. Kept the 6 cyl., put a turbo on it and had all of the mechanical work done professionally. They put a big aluminum radiator in it, dual fans, etc. He had the same exact problem. He ended up taking the fans out and went back to a 7 blade fan with shroud and it eliminated any overheating, totally! His theory was that the electric fans were blocking the ram effect of the moving air at highway speeds. He tried it out and it solved his problem entirely. Just passing it on.
Bob
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Joined: Dec 2010
Posts: 6
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2010
Posts: 6 |
Thanks bobalouie but thats not an option now...no room for the engine fan...thats why I took it off...hits the power steering pump.
Johnny 57
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Joined: May 2004
Posts: 115
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: May 2004
Posts: 115 |
Can you put a longer belt on the p/s pump and notch the shroud. I had same problem without the p/s and used the 7 blade a/c fan.
Ken
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Joined: Mar 2011
Posts: 229
Backyard Mechanic
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Backyard Mechanic
Joined: Mar 2011
Posts: 229 |
I have had the same problem with my '57 that I recently purchased. It ended up being that the timing was off slightly. I had brought my car to a mechanic that tunes race cars. He used a vacuum gauge and a timing light with the advance on it. He tuned the car just right and it runs "sweet". All of the overheating problems went away. The engine in my car is a 355 cu. in. '69 Chevell SBC with a mild cam with a '69 Corvette quadrajet with a Turbo 400 trans with the shift kit. It has all the power I need and still gets 21mpg crusing on the highway. I have installed a new reproduction '57 4 core radiator with a 7 blade flex fan.
The car looks stock on the outside including the interior. I am a purist on my Chevy's but I couldn't pass this one up.
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