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440 running at high temp?? #1074579
09/13/11 09:24 PM
09/13/11 09:24 PM
Joined: Jan 2005
Posts: 167
edison, nj
challengeragtop Offline OP
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challengeragtop  Offline OP
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edison, nj
I have a primarily stock low compresion 440 In my 70 Challenger. It was a 74 motor. Stock bottom end. The only modifications are milled heads and a slightly hotter cam. Stock exhaust and intake. The car was an original 318 A/C 3 speed car with the heavy duty cooling system. I'm using the factory radiator that came with the car. It was boiled out and tested. Problem is I'm running the factory non ralley dash. On hot days the gauge runs just below the hot line. (within the normal range. But I meen it's right next to the line. It seems to be worse on the highway than around town. Since there are no numbers on the guages does anyone know about what temp I'm running at. Is this normal or do I need a larger radiator. I was tole this was the biggest one for the challenger. It's never overheated, but once in a while it will spit out a little coolant after being shut down. Any help would be greatly appreiciated

Re: 440 running at high temp?? [Re: challengeragtop] #1074580
09/13/11 09:33 PM
09/13/11 09:33 PM
Joined: Aug 2007
Posts: 2,754
Conway, SC
T2R9 Offline
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Conway, SC
Without a quality mechanical gauge or a temp gun it is hard to determine where your gauge reads. My mechanical gauge sits right at 180-185 but my factory gauge reads half way. It is normal for these to puke a little after shut down until the radiator finds its happy level.

Re: 440 running at high temp?? [Re: challengeragtop] #1074581
09/13/11 11:24 PM
09/13/11 11:24 PM
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WORSE on the hwy ? ..take the fan off ...and try it. It could be blocking air-flow at speed.

Re: 440 running at high temp?? [Re: dOc !] #1074582
09/13/11 11:54 PM
09/13/11 11:54 PM
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Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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Manitoba, Canada
The only way to do worse on the highway is a cooling system restriction somewhere like poor airflow, clogged rad, etc. Are you sure your lower rad hose isn't being sucked shut when at higher rpm? You're supposed to have a spring in there to prevent that.

I ran a low-cr smogger 440 on a 318 rad for years without problem. Heated up a little bit when sitting in traffic on a warm day, but not much past the 1/2 mark on the gauge. Without an accurate aftermarket gauge it's hard to tell what you're really doing for temp.

Re: 440 running at high temp?? [Re: DaytonaTurbo] #1074583
09/14/11 09:07 AM
09/14/11 09:07 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
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Quote:

The only way to do worse on the highway is a cooling system restriction somewhere like poor airflow, clogged rad, etc. Are you sure your lower rad hose isn't being sucked shut when at higher rpm? You're supposed to have a spring in there to prevent that.






If the spring is in the lower hose, then it's lean. That's why it get's hot under power. Lean and timing is why most guys have temp troubles.

And leave the fan on it, it's not blocking air flow. What's he supposed to do when he slows down without a fan?

Re: 440 running at high temp?? [Re: Challenger 1] #1074584
09/14/11 09:37 AM
09/14/11 09:37 AM
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Posts: 25,200
Upper Midwest
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MoparforLife Offline
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Upper Midwest
Check the actual temp. the factory gauges are not that accurate. Normal to burp after shut down as the temp & pressure rises do to heat soak. This is why burp tanks and coolant reserve systems were made. Do you have a shroud?

Re: 440 running at high temp?? [Re: MoparforLife] #1074585
09/14/11 09:52 AM
09/14/11 09:52 AM
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
As said check actual temp. Boiling out is not terribly effective in alot of cases. I say need to swap radiators. Can toss the stat for a 1 hour test as it may not b opening all the way which causes a restriction "at speed" but OK around town & it's easy to test but way less likely that it is a stat prob. If the sender in the wp housing is bad it'll give erratic/inconsistent readings but you said it's consistant but just showing too high on the gauge right?


live every 24 hour block of time like it's your last day on earth
Re: 440 running at high temp?? [Re: dOc !] #1074586
09/14/11 10:54 AM
09/14/11 10:54 AM
Joined: Mar 2007
Posts: 9,336
South-Central (Sebring), FL
Commando1 Offline
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Quote:

WORSE on the hwy ? ..take the fan off ...and try it. It could be blocking air-flow at speed.



Ummmm...
That's like drilling a hole in the boat to let the water out...

Re: 440 running at high temp?? [Re: Commando1] #1074587
09/14/11 11:35 AM
09/14/11 11:35 AM
Joined: Apr 2009
Posts: 683
Northern NJ
68 Sat Offline
mopar
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Northern NJ
I have a 440 that had the same problems. Wound up being the timing. When I switched to a Mallorey unit that adjusted it made all the difference..My dummy gauge on the dash reads the same as yours and I also have a mooneyes temp gauge that reads around 185...not a problem..


1963 Chrysler 300 Pace Setter Convertible 21K mile survivor 1969 Dodge Coronet 500 1956 Desoto Hemi 1955 Chrysler C300
Re: 440 running at high temp?? [Re: Commando1] #1074588
09/14/11 02:16 PM
09/14/11 02:16 PM
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Quote:

Quote:

WORSE on the hwy ? ..take the fan off ...and try it. It could be blocking air-flow at speed.



Ummmm...
That's like drilling a hole in the boat to let the water out...




OBVIOUSLY our good-buddy Goin'Commando has limited Xperience with boats ...

IF the boat is moving .... and you pull the plug out of the rear of the boat .. any water in the boat will flow-OUT very nicely.

And the same basic premise applies to a cooling system on a car. Past 12-15 mph(or so) .. the forward movement of the vehicle is enuff air-flow to cool the rad. I know a guy who ran a 4 banger Omni for years with a uNfunctional electric fan(due to some electrical issue he could never seem to track-down).

He wound-up putting the fan on a manual switch IF he ever got catch in bumper-to-bumper traffic.

Re: 440 running at high temp?? [Re: dOc !] #1074589
09/14/11 02:43 PM
09/14/11 02:43 PM
Joined: Jan 2007
Posts: 780
Woodinville, WA
Viol8r Offline
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Woodinville, WA
Quote:

Quote:

Quote:

WORSE on the hwy ? ..take the fan off ...and try it. It could be blocking air-flow at speed.



Ummmm...
That's like drilling a hole in the boat to let the water out...




OBVIOUSLY our good-buddy Goin'Commando has limited Xperience with boats ...

IF the boat is moving .... and you pull the plug out of the rear of the boat .. any water in the boat will flow-OUT very nicely.

And the same basic premise applies to a cooling system on a car. Past 12-15 mph(or so) .. the forward movement of the vehicle is enuff air-flow to cool the rad. I know a guy who ran a 4 banger Omni for years with a uNfunctional electric fan(due to some electrical issue he could never seem to track-down).

He wound-up putting the fan on a manual switch IF he ever got catch in bumper-to-bumper traffic.




You are assuming he has an electric puller fan on his stock set-up? Not sure he mentions that in his post. Unless you suggesting he remove his stock mechanical fan? That is not going resolve any issues.

I will agree with other posts and say you are either lean or you could use some more timing.


1968 Pro-Touring Dodge Charger
*2011 Optima Ultimate Street Car Challenge Invitee
http://www.popularhotrodding.com/features/1203phr_1968_dodge_charger/index.html
Re: 440 running at high temp?? [Re: Viol8r] #1074590
09/14/11 02:55 PM
09/14/11 02:55 PM
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Florida STAYcation
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Quote:



You are assuming he has an electric puller fan on his stock set-up? Not sure he mentions that in his post. Unless you suggesting he remove his stock mechanical fan? That is not going resolve any issues.

I will agree with other posts and say you are either lean or you could use some more timing.




NO I am not at all. I am assuming he has a stock mech fan on this ..of some sort. And to remove this fan(a EZ task in most cases) to do a quick test ... to see if this is the issue...?? ... and are you suggesting that a mech fan that is spinning around .. that is close to the rad ...CAN NOT block the flow of air through the rad ?



And if there is a LEAN ISSUE that is causing this ... it would have a major lean-surge during this over-heating.

Re: 440 running at high temp?? [Re: dOc !] #1074591
09/14/11 03:24 PM
09/14/11 03:24 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
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Cincinnati, Ohio
Quote:

Quote:



You are assuming he has an electric puller fan on his stock set-up? Not sure he mentions that in his post. Unless you suggesting he remove his stock mechanical fan? That is not going resolve any issues.

I will agree with other posts and say you are either lean or you could use some more timing.




NO I am not at all. I am assuming he has a stock mech fan on this ..of some sort. And to remove this fan(a EZ task in most cases) to do a quick test ... to see if this is the issue...?? ... and are you suggesting that a mech fan that is spinning around .. that is close to the rad ...CAN NOT block the flow of air through the rad ?



And if there is a LEAN ISSUE that is causing this ... it would have a major lean-surge during this over-heating.




wrong, it can be lean and not surge.

Re: 440 running at high temp?? [Re: dOc !] #1074592
09/14/11 03:28 PM
09/14/11 03:28 PM
Joined: Jan 2007
Posts: 780
Woodinville, WA
Viol8r Offline
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Posts: 780
Woodinville, WA
Quote:

Quote:



You are assuming he has an electric puller fan on his stock set-up? Not sure he mentions that in his post. Unless you suggesting he remove his stock mechanical fan? That is not going resolve any issues.

I will agree with other posts and say you are either lean or you could use some more timing.






NO I am not at all. I am assuming he has a stock mech fan on this ..of some sort. And to remove this fan(a EZ task in most cases) to do a quick test ... to see if this is the issue...?? ... and are you suggesting that a mech fan that is spinning around .. that is close to the rad ...CAN NOT block the flow of air through the rad ?



And if there is a LEAN ISSUE that is causing this ... it would have a major lean-surge during this over-heating.




I am not even really sure how to respond to those questions. Obviously I am not on the same wavelength with you. I guess he should remove his fan all together? Then what is the solution?

BTW, you can be lean and not surge......too much timing is usually what will cause the surge.


1968 Pro-Touring Dodge Charger
*2011 Optima Ultimate Street Car Challenge Invitee
http://www.popularhotrodding.com/features/1203phr_1968_dodge_charger/index.html
Re: 440 running at high temp?? [Re: Viol8r] #1074593
09/14/11 03:34 PM
09/14/11 03:34 PM
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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MoparforLife Offline
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Upper Midwest
If he weren't confused before - he is now.

Re: 440 running at high temp?? [Re: Viol8r] #1074594
09/14/11 03:48 PM
09/14/11 03:48 PM
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Quote:



I am not even really sure how to respond to those questions. Obviously I am not on the same wavelength with you. I guess he should remove his fan all together? Then what is the solution?

BTW, you can be lean and not surge......too much timing is usually what will cause the surge.




I am saying that he should try removing the fan .... on and for a temporary test only.

And YES it can be lean and not surge ... but if it is LEAN ENOUGH to cause a overheating issue ....it will in most cases be surging also.

Re: 440 running at high temp?? [Re: dOc !] #1074595
09/14/11 05:51 PM
09/14/11 05:51 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
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Cincinnati, Ohio
Quote:

Quote:



I am not even really sure how to respond to those questions. Obviously I am not on the same wavelength with you. I guess he should remove his fan all together? Then what is the solution?

BTW, you can be lean and not surge......too much timing is usually what will cause the surge.




I am saying that he should try removing the fan .... on and for a temporary test only.

And YES it can be lean and not surge ... but if it is LEAN ENOUGH to cause a overheating issue ....it will in most cases be surging also.




Get a clue...

Re: 440 running at high temp?? [Re: Challenger 1] #1074596
09/14/11 05:59 PM
09/14/11 05:59 PM
Joined: Jul 2008
Posts: 30,440
Florida STAYcation
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Quote:



Get a clue...




THIS .... from a guy who is totally CLUEless ?

Take a wiff.. ChallyNONE.

Re: 440 running at high temp?? [Re: dOc !] #1074597
09/14/11 06:32 PM
09/14/11 06:32 PM
Joined: Dec 2004
Posts: 5,278
San Jose, California
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DennisH Offline
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Fun read. No/little info from OP results in outstanding reading-fun.

Re: 440 running at high temp?? [Re: DennisH ] #1074598
09/14/11 06:37 PM
09/14/11 06:37 PM
Joined: Jan 2007
Posts: 780
Woodinville, WA
Viol8r Offline
super stock
Viol8r  Offline
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Posts: 780
Woodinville, WA
Quote:

Fun read. No/little info from OP results in outstanding reading-fun.




For all the overheating topics we have had in the past.......removing the stock fan is definetly one of the more well thought one's I have seen in a while.

Seriously though, there are a lot of past posts on overheating with some great information. Start with the simple things, like hoses, and T-stat, then start into the tune and the timing.


1968 Pro-Touring Dodge Charger
*2011 Optima Ultimate Street Car Challenge Invitee
http://www.popularhotrodding.com/features/1203phr_1968_dodge_charger/index.html
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