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  351C running hot--radiator problems?

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Author Topic:   351C running hot--radiator problems?
Greg Pettit
Journeyman

Posts: 67
From: Dallas, TX
Registered: Nov 2001

posted 07-29-2002 05:00 PM     Click Here to See the Profile for Greg Pettit   Click Here to Email Greg Pettit     Edit/Delete Message   Reply w/Quote
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

posted 07-29-2002 05:43 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 07-29-2002 10:35 PM     Click Here to See the Profile for Greg Pettit   Click Here to Email Greg Pettit     Edit/Delete Message   Reply w/Quote
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

posted 07-29-2002 10:41 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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

posted 07-30-2002 07:26 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
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

posted 07-30-2002 09:51 AM     Click Here to See the Profile for Greg Pettit   Click Here to Email Greg Pettit     Edit/Delete Message   Reply w/Quote
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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