Idle temp airflow or tuneup?
#2678873
07/18/19 09:47 PM
07/18/19 09:47 PM
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Joined: Aug 2009
Posts: 39 Springfield VA
GTXOnsfri
OP
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OP
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Joined: Aug 2009
Posts: 39
Springfield VA
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While I love this car, the engine temp at idle has been an issue for years. I thought it would go away when we rebuilt the engine but nope. I’m about to have the floor pans replaced and I though about changing the yoke to fit the 26” radiator at the same time but I thought I would try one last time to see if there is something I’m missing.
The issue is the same as always, when the car is moving it runs at 181 degrees. As soon as you stop and idle the temp starts heading up. If I’m stuck in traffic on the highway the temp can reach 230 and I’m already running the heater at full, putting the car in neutral when I can. I suspect it would keep climbing if I let it. I have the air dam on it. I’ve gone as far as trying to gauge the airflow with a meter. I added an electric 16” pusher fan and that did squat except sound like crap. I’ve tried clutch and no clutch.
So is it lack of airflow or am I missing something. A 440 with no ac and auto gets the 22” radiator. I’d hate move up to the 26 and still have the problem. Advice?
Details: 440 (.030), Stealth Aluminum Cylinder Head, Comp Cam Adjustable rockers (1-5), Edlebrock CamShaft 2192. MSD Digital 6A, 180 Thermostat, Edelbrock 8814 BB Mopar High Volume Aluminum water pump. 727 Auto trans (Bob Cope Racing), 3.23 gears Atomic EFI: Air/Fuel targets [Idle 13.9, Cruise 14.0, WOT 12.8, Boost 11.5]; Ignition timing [Idle 800, total RPM 2500, Idle advance 17.0, Total advance 34.0, Vacuum Advance 10.0] 22 Inch Aluminum Radiator (US Radiator), with shroud and stock fan with clutch. 50/50 antifreeze. The fan is about halfway into the shroud.
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Re: Idle temp airflow or tuneup?
[Re: GTXOnsfri]
#2678902
07/18/19 10:41 PM
07/18/19 10:41 PM
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Joined: Mar 2011
Posts: 3,069 Michigan
A727Tflite
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master
Joined: Mar 2011
Posts: 3,069
Michigan
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So the answer is no - you haven’t installed a larger crank pulley or smaller water pump pulley.
Try the seven blade fan with over driven water pump.
Make sure the timing is correct. That means start with checking the damper against true TDC.
Pretty car by the way.
Last edited by Transman; 07/18/19 10:44 PM.
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Re: Idle temp airflow or tuneup?
[Re: Mattax]
#2678988
07/19/19 09:29 AM
07/19/19 09:29 AM
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Joined: Aug 2006
Posts: 2,499 God's Country Maryland
GODSCOUNTRY340
top fuel
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top fuel
Joined: Aug 2006
Posts: 2,499
God's Country Maryland
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That's a very shallow shroud, the fan may be just pulling air from around it. Try mocking up a deeper one using cardboard around it (temporarily) to make the fan suck air through the radiator at idle. If it runs cooler you've found the problem.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: Idle temp airflow or tuneup?
[Re: Mattax]
#2682187
07/28/19 11:39 PM
07/28/19 11:39 PM
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Joined: Jan 2003
Posts: 5,789 Hamilton, Ontario Canada
Magnum
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Posts: 5,789
Hamilton, Ontario Canada
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For example my stock '85 AMC idles at 12* BTC, 650 rpm but when a temperature control switch (HD-CTO) sees the coolant is 220 F its lets manifold vavuum to the distributor advance.
I have always been a believer in manifold vacuum advance so an engine can idle and cruise above initial timing, which is typically a small number like 5 to 10 degress. This just confirms more is better. Although a few degrees of timing should NOT change an engine from overheating to normal. If it does, it was on the edge in the 1st place. As for GTXOsnfri, heat during idle generally is fan. Do you feel alot of heat being blown through the radiator by the fan?
69 Super Bee, 93 Mustang LX, 04 Allure Super
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