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#505349 - 04/26/08 10:18 PM
Running High Temp On Highway???
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fred
Member
Registered: 07/02/05
Posts: 116
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Hi all, I have a 47 Chrysler Club Coupe with a 218 Canadian 6 cyl engine, 3 spd trans and 3.73 rearend.
Work to date on cooling system, remove freeze plugs and flush block, remove water distribution tube and clean out, new water pump (it works well), good t/stat 160, new coolant 25 % Prestone 75 % deionized water, and 1 bottle of redline Water Wetter, timing set at 2 ATDC.
My heater siser is in the seized positon of cold, which of course is directing all the hot exhaust to the base of the carb, this will be fixed ASAP.
When the outside ambient temps are around 65 and over, and driving on the highway at 50 plus mph, the engine will rise up to the 200 range,in a short time, few miles, I usually pullover, never let her boil over. It never does this at cooler temps 60 and lower.
The bottom rad hoses are in great shape, the rad is a honey comb, but has good flow,was boled out once, it will empty in 10 to 15 seconds in a flow test.
Will the heatriser if it is running hot exhaust through the intake help this engine overheat on wrm to hot summer days.
No brakes are dragging, the engine runs great at highway speed.
Any ideas, what point am I missing on solving this problem................Thanx Fred
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#505387 - 04/27/08 03:01 AM
Re: Running High Temp On Highway???
[Re: fred]
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elmo39
Member
Registered: 08/16/06
Posts: 229
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have you checked your themostat , a good way to test it is place it in a pot and slowly bring it to the boil and checking to see what temp it opens
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#505392 - 04/27/08 07:07 AM
Re: Running High Temp On Highway???
[Re: elmo39]
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fred
Member
Registered: 07/02/05
Posts: 116
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have you checked your themostat , a good way to test it is place it in a pot and slowly bring it to the boil and checking to see what temp it opens
Hi, yes I have tested the t/stat it appears to be working fine, and you can see when it opens in-car, that there is good flow across the top of the rad......................Fred
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#505467 - 04/27/08 01:00 PM
Re: Running High Temp On Highway???
[Re: fred]
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simplyconnected
Member
Registered: 11/06/07
Posts: 147
Loc: Detroit (Royal Oak), Michigan
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...My heater siser is in the seized positon of cold, which of course is directing all the hot exhaust to the base of the carb, this will be fixed ASAP.
When the outside ambient temps are around 65 and over, and driving on the highway at 50 plus mph, the engine will rise up to the 200 range,in a short time,
Your cooling system can only disipate btu's based on two things, outside temp and the amount of heat your engine generates. I will assume air and water flow are good.
Exhaust is so hot, it will turn your manifold cherry red, running properly (open the hood at night, on a long trip and you will see the glow). With the condition of your heat riser, you are asking the coolant to get rid of that heat, but your cooling system doesn't have the capacity.
Free-up the heat riser, your radiator can't compete with exhaust heat. Fixing this will solve your problem.
Install a new (recommended) radiator cap. A 16 pound cap will raise the boiling point of plain water to over 250-deg. F. Using antifreeze, the boiling point will be even higher. - Dave Dare
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#505526 - 04/27/08 05:33 PM
Re: Running High Temp On Highway???
[Re: simplyconnected]
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hwellens
Member
Registered: 04/14/03
Posts: 162
Loc: Maryland
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Do not agree with putting a 16 pound cap on because if the radiator sees that much pressure it will blow it apart.
Make sure you have the correct water pump. They changed around 1950. Also, if it is for a Dodge truck, they are different.
Check your vacuum advance diaphram at the distributor. If this is not working to advance the spark at high speed, the engine will run at a higher temperature.
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#505584 - 04/27/08 09:11 PM
Re: Running High Temp On Highway???
[Re: Bob Kinker]
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fred
Member
Registered: 07/02/05
Posts: 116
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How about the radiater itself? They can get plugged up but still flow water. (just not enough) I've had this happen on a couple of my old cars.
Hi Bob, thanx for the reply, I agree, you can have flow and still be partially plugged or have poor heat transfer.
The rad was boiled out last summer in a shop, tested, it was deemed to be good, not excellent but good.
I just did a flow test, this is a big 1948 Chrylser rad, it empties between 10 and 15 seconds, has about a 4 inch geyser going ou the botom outlet, there is no crap in the rad.
A recore would dtill be better, but I don't have money to burn right now, so I am trying to figure out the root cause of my heating first before spendin the money on a re-core...Fred
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#505585 - 04/27/08 09:15 PM
Re: Running High Temp On Highway???
[Re: simplyconnected]
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fred
Member
Registered: 07/02/05
Posts: 116
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...My heater siser is in the seized positon of cold, which of course is directing all the hot exhaust to the base of the carb, this will be fixed ASAP.
When the outside ambient temps are around 65 and over, and driving on the highway at 50 plus mph, the engine will rise up to the 200 range,in a short time,
Fred, this is exactly what the heat riser is supposed to do, and it appears to be doing it well. But this point, the theromostat and heat riser should open. One diverts heat out the exhaust, the other diverts heat to the radiator. Your cooling system can only disipate btu's based on two things, outside temp and the amount of heat your engine generates. I will assume air and water flow are good. Exhaust is so hot, it will turn your manifold cherry red, running properly (open the hood at night, on a long trip and you will see the glow). With the condition of your heat riser, you are asking the coolant to get rid of that heat, but your cooling system doesn't have the capacity. Free-up the heat riser, your radiator can't compete with exhaust heat. Fixing this will solve your problem. Install a new (recommended) radiator cap. A 16 pound cap will raise the boiling point of plain water to over 250-deg. F. Using antifreeze, the boiling point will be even higher. - Dave Dare
Hi dave, there is good flow, cleaned out water jackets, t/stat isverified, the heatriser is seized, it does not allow the exhaust to flow out freely but is diverting it under the base of the carb first, adding to the heat in warm weather.
The rad i a 1948 non-pressuire design, it is a honey comb core, it cannot be pressurized, no matter what cap is put on, as the overflow tube is at the top of the rad, not in the filler neck, it si designed this way, as the Mopar rads all were till 1950 or 1951.....thanx Fred
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#505625 - 04/27/08 10:35 PM
Re: Running High Temp On Highway???
[Re: fred]
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simplyconnected
Member
Registered: 11/06/07
Posts: 147
Loc: Detroit (Royal Oak), Michigan
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[quote=hwellens]Do not agree with putting a 16 pound cap on because if the radiator sees that much pressure it will blow it apart.
In any case, install a "RECOMMENDED" cap.
The rad is a 1948 non-pressuire design, it is a honey comb core, it cannot be pressurized, no matter what cap is put on, as the overflow tube is at the top of the rad, not in the filler neck, it is designed this way, as the Mopar rads all were till 1950 or 1951.....thanx Fred
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#505628 - 04/27/08 10:56 PM
Re: Running High Temp On Highway???
[Re: simplyconnected]
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fred
Member
Registered: 07/02/05
Posts: 116
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[quote=simplyconnected
Install a new (recommended) radiator cap.
Do not agree with putting a 16 pound cap on because if the radiator sees that much pressure it will blow it apart.
In any case, install a "RECOMMENDED" cap.
The rad is a 1948 non-pressuire design, it is a honey comb core, it cannot be pressurized, no matter what cap is put on, as the overflow tube is at the top of the rad, not in the filler neck, it is designed this way, as the Mopar rads all were till 1950 or 1951.....thanx Fred
To tell you the truth, the Chrsler falthead 6 was no known to run super hot like the Ford flathead V/8, so folks probably used 160 t/stat and in summer the engine temps were probably running between 160 and 180, a 20 to 40 degree margin of error in higher altitudes. No doubt thats hwy a number of old highways throughout the USA and Canada, would have barrels of water along the highways in the Mountain regions for this very reason, not sure though, because I was not born till 1961.
The Heatriser I plan to place it permanently in the warm position, allowing the exhaust to flow out, this I can change back with a heatriser kit, if I feel so inclined at some future point, but idoubt it, as I want to go to dual carbs and split exhaust at some point..........Fred
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#505630 - 04/27/08 11:08 PM
Re: Running High Temp On Highway???
[Re: fred]
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fred
Member
Registered: 07/02/05
Posts: 116
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Okay, I went for a drive tonight, it is cold here tonight around 38.
I went for about a 15 mile ride doing speeds of 45 to 55 mph on an old 2 laned highway, temp was dead on at 160, so because the outside ambient temp is cool, I cold not get an accurate test for the engien running a high temp, I will need to wait for temps in the high 60s or low 70s to test it again.........Thanx Fred
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#505850 - 04/28/08 07:40 PM
Re: Running High Temp On Highway???
[Re: simplyconnected]
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hwellens
Member
Registered: 04/14/03
Posts: 162
Loc: Maryland
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New car radiators and associated equipment are designed to take higher pressure. Your argument is like the one the radiator shop used when they tested my radiator to 16 lbs to check for leaks. They blew a 1 inch hole in it.
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#505857 - 04/28/08 08:22 PM
Re: Running High Temp On Highway???
[Re: simplyconnected]
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hwellens
Member
Registered: 04/14/03
Posts: 162
Loc: Maryland
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I did since they knew nothing about early radiators.
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#505932 - 04/29/08 01:55 AM
Re: Running High Temp On Highway???
[Re: fred]
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elmo39
Member
Registered: 08/16/06
Posts: 229
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Okay it seems your water flow is good , have you checked your timing, if it is not right it can cause your car to run hot
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