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cooling at high rpm ? |
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matty 401 
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Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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 Posted: Jul/06/2021 at 5:42am |
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i put the engine together in 2017 but it sits a lot more then it is driven solid drive 7 blade flex when i was trying to get my friend to roll race at about 55 after i lifter the temp came down to about 186 so maybe new water pump ? it was new in 2017 but just a stock replacement
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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
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Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Posted: Jul/06/2021 at 6:47am |
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Unless it's leaking, the water pump is just fine.
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Steve_P
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Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806 |
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Posted: Jul/06/2021 at 10:37am |
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you are fine, stop worrying, don't do a thing. Water temp should be a minimum of 180F. Modern vehicles typically run 190-200F operating.
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Posted: Jul/06/2021 at 10:45am |
There's good ones and there's bad ones of those aluminum radiators, too.... Some don't flow coolant well, some don't flow AIR well. I've seen some crappy ones. Pressure cap bad causes over-heating. I use a lot of distilled water for my plating processes so always have 10 or so gallons of it around. Also use a lot of "purified drinking water" for the coffee maker - for almost 2 years now there's been NO build-up in that machine. Our water isn't acidic - it's the opposite problem. Anyway, I use distilled in my SX4 - and last change the coolant came out looking almost as good as it did going in last time. I keep a perfect 50/50 mix as much as is possible, pure water, etc. We are on a well so no chlorine issues here. |
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: Jul/06/2021 at 10:56am |
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You may want to consider a stock clutch fan or new locking clutch fan. Besides not drawing as much HP, it will not block air flow at highway RPMs. That and the flex fan detonation issues, ripping through rads/hoods...
Not a fan of flex fans LOL!
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Mopar_guy
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Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4828 |
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Posted: Jul/06/2021 at 11:15am |
X2! I suspect the fan is your problem. Flex fans are cr@p IMO.
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Heavy 488
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Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Posted: Jul/06/2021 at 11:39am |
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I switched out my stock flex to a later thermal clutch since Ive already seen a stock blade flex toss a blade into a hood. If you're a paranoia stricken individual, then a thermal clutch may not be the answer. They start to engage around 170 degrees and never fully " lockup" unless the clutch took a dirtnap and seized.
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Jul/06/2021 at 11:54am |
I checked my original fan when disassembling my car. I noticed one blade was cracking at the front of the mounting flange. Because the car was a high milage daily driver, and never used performance wise, the long term stress eventually made a blade compromised. Even though the fan looked fine while mounted, it was through manipulation of flexing the blades, the crack became apparent. If daily driver, not a weekend driver... obtain a new replacement questioning long term dependability. |
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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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amcenthusiast
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Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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Posted: Jul/06/2021 at 9:09pm |
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First thing, IMO, eliminate the posibility of clogged radiator.
-The new school aluminum radiators weigh 7 lbs less and cool much better. (how else to remove 7 lbs from front of car?) -more rows is not necessarily better -more rows can impede air flow The new school two row units have large 1 inch wide tubes. and they're thinner to allow more air flow. If the new rad doesn't do it... Time to bring out the old Chilton's manual... (whats more expensive? $20 manual or fried 401?) Don't like saying it but you could be having a head gasket seal issue. Speed Daddy 2 row aluminum for about $150
Edited by amcenthusiast - Jul/06/2021 at 9:11pm |
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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amcenthusiast
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Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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Posted: Jul/06/2021 at 9:25pm |
Correct
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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Heavy 488 wrote:
