TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - over heating
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

over heating

 Post Reply Post Reply
Author
Message
javelin mike View Drop Down
AMC Fan
AMC Fan


Joined: Apr/19/2018
Location: covington,la.
Status: Offline
Points: 2
Post Options Post Options   Thanks (0) Thanks(0)   Quote javelin mike Quote  Post ReplyReply Direct Link To This Post Topic: over heating
    Posted: May/16/2018 at 5:28pm
1970 javelin 390 4spd runs hot at low speeds and stop and go traffic. does not run hot at hwy. speed. have new 3 row alum. rad., 3 new elect. fans {2- 12in. pushers and 1- 16in. pulling}, new water pump, can see water flowing good looking into rad. fill neck, can feel air flow good through rad.. fans are rated at 4500 cfm's collectively, have good shrouding around fans. can someone help?
Back to Top
turbo View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Oct/26/2008
Location: chicago area
Status: Offline
Points: 1789
Post Options Post Options   Thanks (0) Thanks(0)   Quote turbo Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2018 at 5:40pm
Check actual temps with heat gun first 
they call me Capt Fun.......!
Back to Top
Rebel Machine View Drop Down
AMC Addicted
AMC Addicted


Joined: Jul/03/2007
Location: Western Il
Status: Offline
Points: 3676
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2018 at 6:16pm
I had trouble with the 12" electric, wouldn't keep my AMX cool. Changed to flex mechanical 18" and fan shroud. Stays 190 degrees now.

-Steve-
Back to Top
Trader View Drop Down
AMC Fan
AMC Fan


Joined: May/15/2018
Location: North America
Status: Offline
Points: 11
Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2018 at 7:23pm
The math says your only using 58% of your radiator.
Stock rad 24"x 16"= 384 sqin
2 x 12" = 226 sqin
1 x 16" = 201 sqin
Old school was "it is always better to pull then push through a rad", but that may not be current.
Still your overheating is likely because your not using a big chunk of rad area.
I'd think putting the 2 x 12" on the back and leaving the whole front area open would give better cooling.  
Back to Top
mixed up View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jun/16/2015
Location: Monroe mich
Status: Offline
Points: 728
Post Options Post Options   Thanks (0) Thanks(0)   Quote mixed up Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2018 at 1:14am
do you have a thermostat in it and what temp is it you mustrun a thermostat or a restrictor the trick is to slow the flow thru the rad and make sure to shroud the fans to get max draw
69 amx 290 auto
65 220 290 4spd
80 ford fairmont
Back to Top
billd View Drop Down
Moderator Group
Moderator Group
Avatar
Forum Administrator

Joined: Jun/27/2007
Location: Iowa
Status: Offline
Points: 27747
Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2018 at 7:54pm
Originally posted by Trader Trader wrote:

The math says your only using 58% of your radiator.
Stock rad 24"x 16"= 384 sqin
2 x 12" = 226 sqin
1 x 16" = 201 sqin
Old school was "it is always better to pull then push through a rad", but that may not be current.
Still your overheating is likely because your not using a big chunk of rad area.
I'd think putting the 2 x 12" on the back and leaving the whole front area open would give better cooling.  


You may be onto something....... shrouds cover so much of the radiator now they are possibly having a NEGATIVE impact as not enough air can flow through the REST of the radiator. In effect, it's like cutting that radiator in half and using only half of it. (exaggeration, but you may see my point)
Small fans and that much shroud means much of the radiator isn't doing anything.

My 73 used to over-heat in town on a day over about 85 or 90 degrees. 
Funny thing - I put a THERMOSTAT in it and guess what........
Yeah, the PO didn't have a stat in it. 
It had a newly rebuilt two row core radiator that was spotless clean inside. I mean it looked like brand new inside that radiator.
Now it runs in the normal range pretty much all the time.

(I did get my hands on a non-dated radiator with a three row core and swapped that in just because I had it and the history of the car but the stat actually did help it)
Back to Top
73hornut View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/03/2007
Location: Southern Oregon
Status: Offline
Points: 2678
Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2018 at 8:45pm
If you like electric fans, then you really should check into the contour dual 2spd fans and shroud, much better over the 3 you're currently using. Been running this in my 401 daily driver Gremlin, for about 8months, fully automated hi and low speeds, with A/C.


71 Javelin
74 Gremlin
86 Eagle wagon
Rogue Valley Rumblers
Like Us on FB
https://www.facebook.com/groups/1602825606650796
Back to Top
mixed up View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jun/16/2015
Location: Monroe mich
Status: Offline
Points: 728
Post Options Post Options   Thanks (0) Thanks(0)   Quote mixed up Quote  Post ReplyReply Direct Link To This Post Posted: May/18/2018 at 1:15am
my rambler with a 290 would run 200-210 with a 190 t-stat I put a 3 row rad in it then put a restrictor in it put a 5 blade fan as close as possible to the rad then got I running 195 -200 its the best I could get
69 amx 290 auto
65 220 290 4spd
80 ford fairmont
Back to Top
Bandana View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Jul/26/2016
Location: NC
Status: Offline
Points: 322
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bandana Quote  Post ReplyReply Direct Link To This Post Posted: May/18/2018 at 9:10am
Am I understanding that you have one fan on the opposite side pushing against the other 2??? This seems counter intuitive?



Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.063 seconds.
All content of this site Copyright © 2012 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or