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Author
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Topic: 351C running hot--radiator problems?
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Greg Pettit
Journeyman Posts: 67
From: Dallas, TX
Registered: Nov 2001
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posted 07-29-2002 05:00 PM
   
I have a mildly built 351C in my '71 Torino. It has A/C, original radiator, 7 blade clutch fan and full original shrouding. It has been running around 195-230 degrees, with or without the A/C on, and it stays hot whether or not I'm sitting or driving on the highway. It gets hot pretty quick if I run it hard, too. It had a 180 degree thermostat, I replaced it and went down to a 160. Also replaced the lower radiator hose. Then flushed the system with the prestone junk twice, and actually removed the radiator and gave it the water hose super flush. I was noticing today that the water temp was 195 at idle, and the water in the cool side of the radiator was around 180. Seems like there should be more cooling than that. Any ideas? Thanks, Greg
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SteveLaRiviere
Administrator Posts: 31026
From: Saco, Maine
Registered: May 99
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posted 07-29-2002 05:43 PM
I'd look hard at your original radiator. When you build in a little more power, you need to build in a little more cooling capacity too. Heat is a byproduct of power.------------------
My Wild Oats have turned to Shredded Wheat.
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Greg Pettit
Journeyman Posts: 67
From: Dallas, TX
Registered: Nov 2001
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posted 07-29-2002 10:35 PM
Well, this radiator has supported a couple of more radical 351's in the past, but maybe it's getting tired.I expected to see more than 15-20 degrees of water temp drop across the radiator. The flow looks OK, but several tubes are just trickling water. Looks like time for a 3-core setup. Had to do it sooner or later for the 460 anyway!
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kid vishus
Gearhead Posts: 3894
From: middle of NC
Registered: Oct 2000
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posted 07-29-2002 10:41 PM
If you are going to go to a 3 core, why not just go ahead and put a 4 core in it? That's what I have in my 70 and back when it had a pretty healthy 351C in it, it never got hot.
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Just Strokin
Gearhead Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001
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posted 07-30-2002 07:26 AM
By chance, did you remove the brass bypass plate under the thermostat? or notice if it was corroding away?if so, you could be bypassing too much hot water back into the engine.
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Greg Pettit
Journeyman Posts: 67
From: Dallas, TX
Registered: Nov 2001
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posted 07-30-2002 09:51 AM
Strokin, I did check the restrictor under the t-stat, it's there and looks like it hasn't moved since 1970! I put a home made deal on the upper radiator hose to gauge flow while the engine was running and the thermostat was open. Man, alot of water comes out of the engine, but I'd estimate 1/2 of the volume can get through the radiator. Must be clogged up pretty bad somewhere in there.
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