440/6 runs warmer than I'd like
#2358477
08/23/17 10:47 AM
08/23/17 10:47 AM
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Joined: Sep 2007
Posts: 196 Riyadh, Saudi Arabia
Merlin45
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OP
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Posts: 196
Riyadh, Saudi Arabia
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I have a restored 74 Challenger with 440/6, the engine was rebuilt due to a cam bearing issue. The engine is a mild build, 10 to 1 compression, 3"TTI headers, 3" exhaust, aluminum heads, mild cam, new radiator(4 row, 26 inch), 727 3 speed auto, MSD ignition box, 3:23 ratio. The engine runs great, starts right up every time however when in city driving it runs warm, warmer than I'd like to see on the temp gauge. It also seems to run rich to me (slight smell of gas when idling). If the center carb is set to rich will this cause the engine to run hotter? If so, can I make small adjustments to the carb to lean it out? What screw do I turn, which direction? I'm no carb expert so any pointers and pictures would be great. The car is currently in storage as I work overseas but I want to have information available for when I get home so I can make the correct adjustments. Thanks for the help.
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Re: 440/6 runs warmer than I'd like
[Re: Merlin45]
#2358492
08/23/17 11:25 AM
08/23/17 11:25 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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there is a 6 pack tuning manifesto on here. Assuming your pulley ratio is not way too slow, then you need more airflow: MP thermal clutch fan or a basic rigid fan (with the most blades) spaced properly into a schroud (~1/2 way in). EDIT what temp is it running at & I would confirm that the gauge is showing a true reading.
Last edited by RapidRobert; 08/23/17 11:29 AM.
live every 24 hour block of time like it's your last day on earth
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Re: 440/6 runs warmer than I'd like
[Re: Merlin45]
#2358495
08/23/17 11:33 AM
08/23/17 11:33 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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Before we go running off into the wild blue yonder, other than the not so accurate stock gauge reading "warmer than I like to see", what makes you think there is a problem with the vehicle?
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: 440/6 runs warmer than I'd like
[Re: Supercuda]
#2358546
08/23/17 12:57 PM
08/23/17 12:57 PM
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Joined: Jan 2003
Posts: 5,394 Pikes Peak Country
TC@HP2
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Before we go running off into the wild blue yonder, other than the not so accurate stock gauge reading "warmer than I like to see", what makes you think there is a problem with the vehicle? Exactly. every big block mopar I've had felt like they radiated A LOT of heat, but they all ran fine on the temp range.
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Re: 440/6 runs warmer than I'd like
[Re: Supercuda]
#2358575
08/23/17 02:00 PM
08/23/17 02:00 PM
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Joined: Jan 2003
Posts: 15,383 Omaha Ne
TJP
I Live Here
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Before we go running off into the wild blue yonder, other than the not so accurate stock gauge reading "warmer than I like to see", what makes you think there is a problem with the vehicle?
SC, I was just going to settle in for another episode of " moparts chase your tail" and you had to ruin it And to Merlin, unfortunately with your being overseas there is little we will be able to help with until you are stateside with the car. I would suggest tackling the issues one at a time unless one likes running off into the wild blue yonder The most accurate method of temperature measurement is achieved with a digital meter and thermocouple probe. possibly you can obtain one while waiting
Last edited by TJP; 08/23/17 02:50 PM.
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Re: 440/6 runs warmer than I'd like
[Re: Merlin45]
#2358577
08/23/17 02:08 PM
08/23/17 02:08 PM
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Joined: Jun 2004
Posts: 3,380 St. Charles, MO
wingman
Uncreative Title
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St. Charles, MO
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I agree--before you do ANYTHING else get a good mechanical temp gauge (or IR thermometer). The factory gauges don't tell you anything meaningful.
Nothing is worse than working to solve a problem that you aren't even sure you have.
And if you DO have a high temp problem, you will need a good gauge to track your improvements as you make changes.
1969 Dodge Coronet Super Bee 383 A4 1970 Plymouth Road Runner 440 FC7 (sold)
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Re: 440/6 runs warmer than I'd like
[Re: 71birdJ68]
#2358579
08/23/17 02:12 PM
08/23/17 02:12 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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I bet it'd run hotter in Riyadh!
Seriously, it sounds like guys are discounting your issue but they are mostly speaking from experience. Factory gauges can be quite a ways off. It sounds like you have a big enough radiator if you can get air to flow through it. Blazin' Bob doesn't know how to spell shroud, but he is right that a too-slow water pump can reduce cooling capacity. Chrysler engineers did not take a one-size-fits-all approach to engine cooling. The pulley ratio for a car originally equipped with 4.10s is different from the fan ratio for 3.23s, at least it has seemed that way to me.
Look at the fans used. Some had quite a few blades, some had five. I'm thinking that for traffic many blades are better, while at highway speeds they may act as a roadblock to airflow. A shroud makes the fan more efficient, it should be there unless there is a compelling reason for it not to be.
The factory took pains to make sure that the air striking the front of the car actually went through the radiator and not around it. Many cars had rubber seals in the hood region, or around the radiator opening. You may want to check what your car came with and if they're in place.
There are no manifold heat risers on 440Source, Edelbrock, and Trick Flow heads. I would doubt that the higher performance heads have them either. Your car should not smell like gasoline when idling or sitting. I do not believe 6-pack tuning is for the novice, although the Manifesto is pretty complete. I'm sure the experts here will amplify my statement.
Retarded timing can cause overheating.
RB engines are physically large and can stifle airflow through the engine compartment.
But first you have to measure the situation and see if it is a real problem.
Good Luck! And don't let the Religion Police get you!
R.
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Re: 440/6 runs warmer than I'd like
[Re: 62maxwgn]
#2358713
08/23/17 07:17 PM
08/23/17 07:17 PM
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Joined: Aug 2012
Posts: 1,574 Lakeland FL
floridian
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pro stock
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Ever wonder how much heat a set of 3" headers generate ? What I noticed most ( on the last street car I had with headers) was how quickly it cooled down after shutting off, vs the stock exhaust manifolds..
Last edited by floridian; 08/23/17 07:17 PM.
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Re: 440/6 runs warmer than I'd like
[Re: Sxrxrnr]
#2358823
08/23/17 10:58 PM
08/23/17 10:58 PM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
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Rich usually runs cool(er). Don't think that is your issue.
Hot at slow speed and cool running at higher speed usually means inadequate air flow. Fan + shroud (hopefully shroud!) not enough.
Can you share some detail on your current fan/shroud setup?
PS: some heating at a stop or low speed is expected. 210 F I think is fine, 220 F some concern and 230F getting too hot for my taste. An after market mechanical temp gauge may help figure it out.
Last edited by ahy; 08/23/17 11:02 PM.
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Re: 440/6 runs warmer than I'd like
[Re: Merlin45]
#2358824
08/23/17 11:02 PM
08/23/17 11:02 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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A stock 440/6 installation (this one isn't stock)uses the non-AC water pump with corresponding pulley. So verifying what you have has merit
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: 440/6 runs warmer than I'd like
[Re: 62maxwgn]
#2358874
08/24/17 12:38 AM
08/24/17 12:38 AM
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Joined: Jan 2003
Posts: 15,383 Omaha Ne
TJP
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Ever wonder how much heat a set of 3" headers generate ? SC, I was just going to settle in for another episode of " moparts chase your tail" and you had to ruin it Sorry, I'll put myself in timeout here we go
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Re: 440/6 runs warmer than I'd like
[Re: TJP]
#2358941
08/24/17 01:48 AM
08/24/17 01:48 AM
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Joined: Feb 2004
Posts: 7,196 Harrisburg, Pa.
screamindriver
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Ever wonder how much heat a set of 3" headers generate ? SC, I was just going to settle in for another episode of " moparts chase your tail" and you had to ruin it Sorry, I'll put myself in timeout here we go 440/6 ? ! Did someone say 440/6 ????? That alone will start the ..You'd think the same ones would be sore from trying to pile on to each other every thread but it never ends...
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