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cooling at high rpm ? |
Post Reply | Page 123 11> |
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1730 |
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Posted: Jul/04/2021 at 9:26am |
so i went to Good Guys in Des Moines Saturday on the way home car ran 190-200 at 2600-3000 rpm when i would speed up for a bit it ran cooler but crept back up when i slowed down i have a 3 core aluminum rad and stock fan should i go electric as a add on ? or just totally do away with the stock fan set up and go full electric ? car is a 72 Matador 401 727 trans 355 rear end thanks in advance
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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Is it water flow or air flow that is causing it to warm up? Is the issue speed related, ie air flow, or water related, ie rpm's? If you are doing a steady cruise at 60 mph but 2500 rpm's, does it heat up?
Chris
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Are you using a shroud with the stock fan? 190/200 is hot????
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1730 |
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190-200 is not hot and no shroud even 2500 about the same temp i did wind it up a bit maybe 4500 then let out of it and the temp came down to 188 or so but slowly crept back up to the 200 range water pump was new in 2017 and the radiator
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Fans are useless with a shroud
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Assuming your fan is pushing a good amount of volocity, engine should be doing well with water pump. My electric fans have integral shroud, that is done like the Contour fans, so if you do an electric fan setup, that would be your best option.
With a 3 row core radiator it should cool well enough. Though, you have less air flow (CFM capabilities through the core). It probably is a concern if thermostat is staying closed until above normal temps. Nobody asked what thermostat your running. Try bumping down a wee bit. I think stock is 160°... you may have a 180° one. Its a balance thing. Not enough air flow with late opening thermostat will make your hot and normalized temp fluctuate. After making my reply, I noticed the reply before mine... Wha! No shroud? You need a shroud... the 3 row core needs some pull for air to flow. A 2 row core, can run without fan shroud on a maintained driving speed around 40 on up, with an oem grill. Also an air pocket can do the same. I think someone had put their upper radiator hose on backwards, and had an air pocket issue. It will fit, but it keeps a high point, that bends down, to trap air, midway from engine. Edited by 304-dude - Jul/04/2021 at 10:34am |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Since when is a 160 thermostat stock? Try 195.
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gtoman_us
Moderator Group Joined: Jul/10/2007 Location: E. Nebraska Status: Offline Points: 3859 |
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Hey, I was there at GG Des Moines as well. Total AMC count was 21.
Now at 22 since I did not see your Matador. 200 is well within operational range on a 90* day at highway speed. No concerns. And shrouds do work.
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Moderator - Emeritus
Used to collect trophies, now I collect gas receipts and put on miles 1964 Rambler Ambassador Cross Country Wagon 1965 GTO 1931 Model A original survivor "Flat Roofs are Cool" |
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Online Points: 2713 |
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With a 50/50 coolant/water mix and a 15-pound radiator cap, the boiling point is 268 degrees F. [Not allowing for the 15-pound cap, the boiling point of a 50/50 mix is 223 degrees F.]
So what was your initial question, again? Remember, a 160-degree stat doesn't mean your engine will run at 160 degrees. It only means that the stat BEGINS TO OPEN at 160 degrees. And what is the AMBIENT temperature? Delta T [differences in temperature] determine how easily the heat is extracted from the engine via the radiator. Higher ambient temp means that it's more difficult to shed the heat. It's all about Flo[w]... coolant flow, air flow. [Flo does more then sell insurance in stupid commercials, y'know.]
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6754 |
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Your temperature is not unreasonable. Fan shroud for sure would be a minimum. Fan shroud, high flow thermostat, 3/32" hole drilled in the flange area of the thermostat to relieve any possible air trappings would be the list if your concerned. |
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