Project: Tow Tool
Thread Starter
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Senior User
Joined: Sep 2011
Posts: 442
Likes: 1
From: Roanoke, VA
It's not about raising the temperature.
More pressure (to a point) will keep coolant from boiling and leaving hot spots in the heads.
It can't do it's job as a vapor.
IIRC my 460 calls for a 14 Psi cap.
But you're not even sure that you have an overheating problem without measuring.
The fan isn't really needed on the highway. There should be enough air flow at those speeds regardless of engine rpm.
What are the ambient temps right now where you live?
More pressure (to a point) will keep coolant from boiling and leaving hot spots in the heads.
It can't do it's job as a vapor.
IIRC my 460 calls for a 14 Psi cap.
But you're not even sure that you have an overheating problem without measuring.
The fan isn't really needed on the highway. There should be enough air flow at those speeds regardless of engine rpm.
What are the ambient temps right now where you live?
Thread Starter
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Senior User
Joined: Sep 2011
Posts: 442
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From: Roanoke, VA
OK at idle warmed up. These numbers are takem about 1 inch form the exhaust flange.by cylinder Number
1 - 494
2 - 350
3 - 650
4 - 300
5 - 320
6 - 600
7 - 470
8 - 542
t stat housing 170 deg
inlet to water pump on bottom 140 deg
this was after the truck sat for 30 minutes then warmed back up.
13lb radiator cap
1 - 494
2 - 350
3 - 650
4 - 300
5 - 320
6 - 600
7 - 470
8 - 542
t stat housing 170 deg
inlet to water pump on bottom 140 deg
this was after the truck sat for 30 minutes then warmed back up.
13lb radiator cap
Thread Starter
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Senior User
Joined: Sep 2011
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From: Roanoke, VA
It did cool down I warmed it back up. So you wouldn't be scared about the 650.
I did have a header leak so I'm letting it cool to tighten the bolts.
And again it is 100 deg out.
I did have a header leak so I'm letting it cool to tighten the bolts.
And again it is 100 deg out.
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Senior User
Joined: Sep 2011
Posts: 442
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From: Roanoke, VA
Yes the engine was running. I drove it all morning. Got home cooled for 30 minutes while I started my son staining our shed. went back to the truck and started it up. brought it up to temp and took the readings while running.
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Senior User
Joined: Sep 2011
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From: Roanoke, VA
I've only done it while driving. I'll do it in the driveway.
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Senior User
Joined: Sep 2011
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From: Roanoke, VA
So I just drove it for a while. Here's the kicker. I had a 6" section of radiator shroud missing. I riveted some aluminum into it. I couldn't hardly get it above half.
I climbed the biggest hill around in 3rd at 3000 rpms
then came home and took my readings again.
1 - 480
2 - 500
3 - 700
4 - 664
5 - 640
6 - 660
7 - 507
8 - 655
T stat housing 191
inlet to water pump 178
again ambient is 103
I climbed the biggest hill around in 3rd at 3000 rpms
then came home and took my readings again.
1 - 480
2 - 500
3 - 700
4 - 664
5 - 640
6 - 660
7 - 507
8 - 655
T stat housing 191
inlet to water pump 178
again ambient is 103
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
Sounds like you may have found your cooling problem. Unfortunately headers cool rapidly at idle, you don't want to see what they look like at speed. My 66 Shelby would heat them red hot or more for about 6" from the port at 60mph (3000rpm). I discovered this when I exploded a heater core then had to drive a bit with the heater out of the car.
Cargo Master
Joined: Aug 2007
Posts: 2,561
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From: New Zealand
My T19 also whines more than I like in 3rd, under load. The gears themselves don't show wear.
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Senior User
Joined: Sep 2011
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From: Roanoke, VA
I got a kit from novak. It did not include the gears.
Mine was so bad I couldn't talk over 3rd gear. So it's fixed now and is fine.
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Senior User
Joined: Sep 2011
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From: Roanoke, VA
Guys I really appreciate your help with this. I did a 600 mile round trip yesterday in 103 deg heat. At one point my floor boards were 130. I love my new infrared thermometer. We were taking temps of everything.
Anyway more on the heating up issue.
It did great when I was floggin it like a rented mule. Secondaries open etc.
Or at 70 turning 3000.
With my heavy load going down 6500lbs it did very good. With the lighter load it was worse, becasue the engine wasn't working so hard.
It heats up at all the wrong times when you think about motors heating up.
So here is what I've been able to narrow it down to. Over 2500 rpms when I am barely on the throttle not giving it alot of fuel it gets warm. If I let is slow down then punch it and open the secondaries it cools down in less than a minute or so.
I know my motorcycle when it's lean it'll over heat. Cna the same be said for a big block? Should I play with my jetting? As a refresher I have a 600cfm holley 4160 with 68 main jets.
What are your thoughts?
Anyway more on the heating up issue.
It did great when I was floggin it like a rented mule. Secondaries open etc.
Or at 70 turning 3000.
With my heavy load going down 6500lbs it did very good. With the lighter load it was worse, becasue the engine wasn't working so hard.
It heats up at all the wrong times when you think about motors heating up.
So here is what I've been able to narrow it down to. Over 2500 rpms when I am barely on the throttle not giving it alot of fuel it gets warm. If I let is slow down then punch it and open the secondaries it cools down in less than a minute or so.
I know my motorcycle when it's lean it'll over heat. Cna the same be said for a big block? Should I play with my jetting? As a refresher I have a 600cfm holley 4160 with 68 main jets.
What are your thoughts?