Overheating issues in 508
#1833699
05/25/15 09:21 AM
05/25/15 09:21 AM
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Joined: Jul 2004
Posts: 4,732 Watertown, WI
MikeyT
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Hi guys,
Finally got the 508 in the road runner and am now trying to determine a slight over heating issue.. I have a 26" 3 core champion radiators with 440source pump, housing on front and 185 stat..
Car keeps cool at first start up and while on cruising on highway, will keep cool, but when doing stop and go traffic, starts to heat up and will overheat ( has not yet) A few and questions
Engine is breaking in has about 75 miles on it ( just a baby) I will check heat with heat gun at spots I suspect 440source pump, will my old cast iron one work better?
Thanks guys,
1969 Dodge Dart Swinger
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Re: Overheating issues in 508
[Re: MikeyT]
#1833761
05/25/15 11:40 AM
05/25/15 11:40 AM
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Joined: Jul 2004
Posts: 4,732 Watertown, WI
MikeyT
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Thanks Ahy,
You are a 100% right.. So it is stock location fan, but the champion radiator doesn't have a shroud on it, and previously my old 440 cooled fine without, I plan on adding it going forward..
I will check the plugs and see if they appear leaned out.. I will also bump up initial.
My concern is the 440source pump, I got it before I read some grumbling on here, thought it might be the culprit and thought maybe I should toss it and put the old iron one on from my 440 instead of using it as a paperweight:)
Do you think the lack of a shrould and tuning issues could be the more likely culprit?
Mikey
Last edited by MikeyT; 05/25/15 11:41 AM.
1969 Dodge Dart Swinger
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Re: Overheating issues in 508
[Re: MikeyT]
#1833769
05/25/15 11:52 AM
05/25/15 11:52 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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the 440 cooled OK with the same rad/fan distance/no shroud? did the 440 have the 'source alum pump? If no on the pump Q reportedly iirc there was a run of restricted 'source pumps way back which has been resolved. a quick pump housing swao including the pump itself if it is a scroll type would ans that. What Ahy said #1-air. I'm assuming same pulley ratio. If it ain't the pump/housing I'm not grasping what is different unless it is the eng but OK at speed pretty much elims the eng & points to air or water speed unless the timing is too retarded at the RPM's it is running hot at
live every 24 hour block of time like it's your last day on earth
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Re: Overheating issues in 508
[Re: MikeyT]
#1833778
05/25/15 12:03 PM
05/25/15 12:03 PM
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Posts: 4,732 Watertown, WI
MikeyT
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Thanks guys
The old mild 440 had cast iron everything on it, again with no shroud which I will add. The engine has a quickfuel HR 850 mechanical secondary on it..so if it is flow, would that mean bigger Rad? All things being equal.
Mikey
1969 Dodge Dart Swinger
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Re: Overheating issues in 508
[Re: MikeyT]
#1833784
05/25/15 12:10 PM
05/25/15 12:10 PM
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RapidRobert
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the rad was fine with the 440 so its OK with the 508, it's something else
live every 24 hour block of time like it's your last day on earth
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Re: Overheating issues in 508
[Re: MikeyT]
#1833792
05/25/15 12:19 PM
05/25/15 12:19 PM
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MikeyT
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Good to know... Thanks Robert, well we will fiddle with tune and add shroud... I also will take a few temp readings and get back to you with those as well.
Mikey
1969 Dodge Dart Swinger
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Re: Overheating issues in 508
[Re: MikeyT]
#1833814
05/25/15 01:02 PM
05/25/15 01:02 PM
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RapidRobert
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before I get rolling for the day tell me what is different other than the mtrs? same rad same fan distance same hoses same pulleys. Me I'd change out the pump/pump housing first, before I touched the eng, temp gun is OK but you already know it is hot
live every 24 hour block of time like it's your last day on earth
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Re: Overheating issues in 508
[Re: MikeyT]
#1833818
05/25/15 01:13 PM
05/25/15 01:13 PM
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Joined: Jan 2003
Posts: 28,068 Irving, TX
feets
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Forget the pump. There is rarely an appreciable real world difference.
Get a shroud on there and watch your problems go away.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Overheating issues in 508
[Re: feets]
#1833827
05/25/15 01:21 PM
05/25/15 01:21 PM
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RapidRobert
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some of the alum housings are restricted/defective (I have one). iirc someone mentioned the scroll type vanes might not flow enough. Plus that'd be easy stuff to check/change. if it was Ok wo the shroud before its OK with it now unless something is fubared in the new eng making it produce way more heat which means the eng is the prob not the shroud
live every 24 hour block of time like it's your last day on earth
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Re: Overheating issues in 508
[Re: MikeyT]
#1833837
05/25/15 01:33 PM
05/25/15 01:33 PM
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The restrictive housings were corrected 7 or 8 years ago. There shouldn't be many (if any) of those in new stock.
I remember that highly detailed water pump test done on the FMC motorhome with a 440. There was not much difference in water pump volume. All of them moved enough to cool a motor at any regular engine speed.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Overheating issues in 508
[Re: ahy]
#1833885
05/25/15 02:29 PM
05/25/15 02:29 PM
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Generally cool when rolling and hot at a stop is air flow related. Pay attention folks, this is a key point. If you have overheating issues at idle the problem is not likely water flow related. Heat generated is a factor of HP, period. You might only have 60 more cubes, but how many more HP than the "cooled just fine 440"? I had a 413 that ran just fine temp wise, then I rebuilt it and warmed it up some. It would overheat at idle and low road speeds, but before the rebuild it didn't do that. I did a bunch of stuff to fix it, even put in a bigger radiator. Nothing helped till I got a shroud then no more issues.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Overheating issues in 508
[Re: MikeyT]
#1833909
05/25/15 02:57 PM
05/25/15 02:57 PM
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Joined: Jul 2004
Posts: 4,732 Watertown, WI
MikeyT
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yeah this 508, hopefully makes HP in bunches compared to my nice modest and decent but lower compression 440. here is the info same pulleys, same distance from the fan, no shroud, different carb, same headers, same smart ass driver too! Mikey
1969 Dodge Dart Swinger
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Re: Overheating issues in 508
[Re: Hemi ragtop]
#1834527
05/26/15 01:53 PM
05/26/15 01:53 PM
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Joined: Jan 2003
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dogdays
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Heat isn't related to horsepower POTENTIAL, it's related to horsepower USED. So unless you are dragging a trailer now, and weren't with your original setup, the horsepower used in steady-state driving is the same, therefore heat should be the same.
Doesn,t matter if the engine has 80 hp or 8,000,000 hp, if it takes 35 hp to move the car, that's what the engine will make.
R.
Last edited by dogdays; 05/26/15 01:54 PM.
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Re: Overheating issues in 508
[Re: MikeyT]
#1839567
06/02/15 10:31 AM
06/02/15 10:31 AM
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Joined: Jul 2004
Posts: 4,732 Watertown, WI
MikeyT
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Ok, fan shroud is on, took it for a cruise last night. It seems somewhat better but was still warming up to about right in middle of my factory gau. I think it would of kept going Ok, so shroud helped but did not fix it Mikey Ok so parts Champion 26 radiator 4 core Fan shroud 17 inch mechanical blade 440souce housing passenger side outlet 440source water pump Timing 24* initial 34* total J
1969 Dodge Dart Swinger
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