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Re: tough one: overheating on the highway
[Re: TJP]
#1719525
01/04/15 08:38 PM
01/04/15 08:38 PM
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Joined: Jan 2003
Posts: 1,381
Youngsville, NC
dem440c
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,381
Youngsville, NC
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intake and carb are factory 2 bbl... I think the carb on it now is the factory correct Holley for an '85. At different times I've had a variety of factory carbs on it from 60's, 70's, and 80's vintage. As I mentioned, I have lots of cars/trucks/parts and am always swapping stuff around. The highway hot issue has been exactly the same regardless of what carb was on it. I can't recall ever changing the fuel pump, all I will say to argue that point is that by the seat of the pants dyno it runs good.
Ya know, that's another idea, I could book some dyno time to experiment with it. It would give me some other data points about how it is running and the A/F conditions etc.
I hope I don't get an internet lynching, please be patient with me as this truck is mainly just our beach cruiser and occasional knock around town rig. Updates may not be fast and furious as it is just one of many projects demanding my limited wrenching time. I would like to be able to drive to the beach at full speed so I continue working on it here and there.
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Re: tough one: overheating on the highway
[Re: roe]
#1719528
01/05/15 12:35 AM
01/05/15 12:35 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Dan you're doin fine & the lynchings ain't from an OP being too slow to respond to inquiries/suggestions etc but instead are from deleting whole threads and not reporting back when a final solution is finally realized/hit upon. Yes it's gonna be a blast when you discover what it as (assuming the gauge is correct & I'm inclined to think it is since it creeps up) cuz sumpin for sure is makin it reach 240F
live every 24 hour block of time like it's your last day on earth
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Re: tough one: overheating on the highway
[Re: dem440c]
#1719529
01/05/15 12:53 AM
01/05/15 12:53 AM
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Joined: Jan 2003
Posts: 8,392
Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,392
Highland, MI.
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Quote:
Quote:
I sure hope we find out what the cause is as the remedies are all over the map…. 
holy moly you aren't kidding... you guys have a LOT of great ideas. A lot of them I have tried already and I've been taking notes on some things to try that I haven't done yet.
- full length headers, 2-1/2" duals through Flowmasters exiting in front of the axle. I'm pretty confident there is no exhaust restriction.
- gonna try the idea to remove the fan and see what happens. Only problem there is I have to drive 25 minutes to get to a highway, guess I'll bring tools and see what happens.
- I haven't mapped the timing yet to see exactly what the distributor is doing as the RPMs increase, I can do that. It runs perfect so I haven't been thinking in that direction but it wouldn't hurt to see what it is doing.
- pulling freeze plugs is gonna be a sucky job but I agree that the symptoms would line up with that cause so it should be explored. Man, that is gonna take me a whole freakin' weekend to pull all that apart and then get new plugs back in... sigh
- changing the ignition module is easy, I have a box full of them. I'll try that just because it is quick and easy.
- someone mentioned air baffles, I have all the ones in place that cover the gap between the core support and the radiator. What else should be there?
Pop out one EASILY ACCESSIBLE freeze plug & see if there is a bunch of mud in that area. If it's clear, then it's probably not that issue. When I started popping out all the freeze plugs on my Super Coupe, there was lots of sediment at each of them - simply put - the cooling passages were really restricted. Sounds like you do not have an exhaust issue (headers & Flowmasters). If one of the mufflers was defective & really blocked, you would have no upper RPM's so you could feel & probably hear that. Good luck. Yeah - we are all anxious to hear what the issue really is - this is a GOOD one!
No Man With A Good Car Needs To Be Justified
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Re: tough one: overheating on the highway
[Re: stumpy]
#1719531
01/05/15 12:02 PM
01/05/15 12:02 PM
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Joined: Jan 2003
Posts: 1,381
Youngsville, NC
dem440c
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,381
Youngsville, NC
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Quote:
What torque converter are you running?
factory I assume... I haven't been inside the engine or trans, that would be the only parts of the truck I haven't worked on yet. I did replace the transfer case but that's as close as I got to the T/C. There are major parts from 5 different parts trucks in this thing so far, eventually to be 6 when I do a Cummins conversion but that is not planned for another couple of years. In the meantime I'd like for the 318 to be fully functional.
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Re: tough one: overheating on the highway
[Re: dem440c]
#1719532
01/05/15 06:27 PM
01/05/15 06:27 PM
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Joined: Jan 2003
Posts: 15,304
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,304
Omaha Ne
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Quote:
intake and carb are factory 2 bbl... I think the carb on it now is the factory correct Holley for an '85
Ok a stock 2 barrel with headers and flow masters coupled with todays awesome fuel could point to a lean condition especially when leaning on it IE: highway speeds. Bear in mind they were lean from the factory 
I would map the timing, verify the pulley sizing and then check the AF ratio 
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Re: tough one: overheating on the highway
[Re: TJP]
#1719533
01/05/15 06:33 PM
01/05/15 06:33 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
intake and carb are factory 2 bbl... I think the carb on it now is the factory correct Holley for an '85
Ok a stock 2 barrel with headers and flow masters coupled with todays awesome fuel could point to a lean condition especially when leaning on it IE: highway speeds. Bear in mind they were lean from the factory
I would map the timing, verify the pulley sizing and then check the AF ratio
I have installed at least 10 sets of headers for my self and friends over the years. Every time I jetted up the carb, you have to when you put on headers. That's called tuning your car, not just bolting on stuff.
Then add 10% ethanol and your lean as hell.
Can't believe the OP and most everyone else over looks that. 
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Re: tough one: overheating on the highway
[Re: Challenger 1]
#1719534
01/05/15 08:52 PM
01/05/15 08:52 PM
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Joined: Jan 2003
Posts: 1,381
Youngsville, NC
dem440c
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,381
Youngsville, NC
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Quote:
Quote:
Quote:
intake and carb are factory 2 bbl... I think the carb on it now is the factory correct Holley for an '85
Ok a stock 2 barrel with headers and flow masters coupled with todays awesome fuel could point to a lean condition especially when leaning on it IE: highway speeds. Bear in mind they were lean from the factory
I would map the timing, verify the pulley sizing and then check the AF ratio
I have installed at least 10 sets of headers for my self and friends over the years. Every time I jetted up the carb, you have to when you put on headers. That's called tuning your car, not just bolting on stuff.
Then add 10% ethanol and your lean as hell.
Can't believe the OP and most everyone else over looks that.
fair enough, you could be on to something there. I have it on my short list to book some dyno time and see what the data says. Never a bad idea anyhow to measure things on the dyno.
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Re: tough one: overheating on the highway
[Re: Challenger 1]
#1719537
01/06/15 04:23 PM
01/06/15 04:23 PM
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Joined: Aug 2005
Posts: 303
Staten Island, NY
RO23dave
enthusiast
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enthusiast
Joined: Aug 2005
Posts: 303
Staten Island, NY
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Been reading this post with interest, as i have been having overheating problems with my truck, pulling my trailer. On level streets or highways, no problem, soon as i hit a hill, as on PA turnpike going to Maple Grove, i can watch the temp climb rapidly. Got me thinking, and saturday nite, i started my truck, let it warm up and checked the flapper, inside the snorkle extension of the air cleaner. It was completely closed, wouldnt open up, so i flipped over the top lid. Air cleaner was new, and the truck stopped shaking and ran smoother. I wont know if this will cure my heating problem, until the spring, but, i was desperate. Everything that was mentioned here, i've done, radiator, hoses, waterpump, spring in lower hose, distributor, fan clutch, you name i've done it. I would think the motor would go super rich, with this problem, and computer is trying to compensate. Again, i won't know until spring. Dave ss/ea 1355 
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Re: tough one: overheating on the highway
[Re: dan9]
#1719539
01/07/15 04:10 PM
01/07/15 04:10 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,161
CT
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More air/fuel being burned = more heat from combustion
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: tough one: overheating on the highway
[Re: GTX MATT]
#1719540
01/11/15 06:39 PM
01/11/15 06:39 PM
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Joined: Jan 2008
Posts: 2,225
ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,225
ILLINOIS
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the "several carbs" he has had on there would rule out that, I'd think.
No 2 carbs I would think were jetted identical. especially that many carbs taken over that many model years. IDK if he tweaked them out and made all the adjustments possible on each carb while it was on this engine, but unless they were all Holley 2 barrels that came off of '85 Dodge trucks, I would have thought that he would have seen something different in how hot it ran between the various carbs if this was the issue. I have installed headers on more than 1 vehicle myself over the years and have never had it cause a lean condition or an overheat; headers release alot more heat than manifolds, if anything I would think things would run cooler with them especially at highway speeds, that was why so many motorhome guys would go to headers to dissipate the heat better;
Having said that, I used to maintain a '73 Dodge Van for an older couple in town, they'd bought it used and had sat more than not, before they got it; back in like '95 the thing had like 32K miles (over 20 years old "then") One time I got a call for a water leak, the back freeze plug on the pass side was trickling water; I went to replace it and that remains the most gunked up motor I have seen to date; I could not believe all teh rust and scale in the water jackets; it was so bad as to actually help slow down the leak at the freeze plug. They always only drove it in town and it wouldn't overheat but did seem to run a little warmer than it should; good thing they had not taken it out on the road.
Having discovered that, I popped every freeze plug I could and flushed the $#!t out of that block. It made a huge difference. Trucks and vans have plenty of room to get at most of the freeze plugs.
You don't need to pull them all but at least the easiest ones on each side and run a garden hose in one so the water can run out the next freeze plug hole.
Also; something I have seen more than once is casting sand remaining in the jackets after many years even with multiple "typical" coolant flush jobs over the years, sand collects in the very bottoms of the jackets and coolant just flows over. I just pulled a '76 360 apart 2 weeks ago, and sent to the machine shop for hot tank and bore/hone. I popped the freeze plugs from that block on the stand, and found it to have ALOT of sand in the jackets; this engine came out of a wreck 20-some years ago and put in a barn with a tarp over it and basically forgotten about.
I found the 4.0 block on my Wrangler to have had the same issue when I pulled it out to replace the frame 5 years ago.
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Re: tough one: overheating on the highway
[Re: volaredon]
#1719541
01/12/15 02:39 AM
01/12/15 02:39 AM
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Joined: Feb 2003
Posts: 4,793
Castlegar, BC, Canada
That AMC Guy
master
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master
Joined: Feb 2003
Posts: 4,793
Castlegar, BC, Canada
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Any thoughts on a blown head gasket? Water in the oil isn't always a sign of a bad head gasket. They can pop between combustion chamber and water jacket too and if light enough, don't always use coolant under this condition either.
Bloody Mary, Full of Vodka, Blessed art thou among cocktails....
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