Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 03-28-2010, 08:37 PM
70 net440 70 net440 is offline
Inactive User
 
Join Date: Feb 2003
Location: Yreka, CA
Age: 59
Posts: 178
Default Rad hose?

Picked up a Dart bracket car with a 440. The lower rad hose was a flex type that was collapsing when the rpm's were raised up. I replaced it with a good preformed hose with a spring inside. It still collapses. Any ideas?
Reply With Quote
  #2  
Old 03-28-2010, 10:18 PM
Dirt Driver Dirt Driver is offline
Inactive User
 
Join Date: Mar 2010
Location: Washington, D.C.
Posts: 145
Default

It may just have too sharp a bend in it or may be too weak and soft. Once it starts to collapse even a spring may not help it later. I'd try a new hose with a spring and see how it does.
Reply With Quote
  #3  
Old 03-28-2010, 11:34 PM
djswwg djswwg is offline
Inactive User
 
Join Date: Apr 2000
Location: in my garage
Posts: 1,401
Default

be sure the rad cap is working properly, it has to hold pressure and vent when necessary......djs
Reply With Quote
  #4  
Old 03-29-2010, 10:40 AM
70 net440 70 net440 is offline
Inactive User
 
Join Date: Feb 2003
Location: Yreka, CA
Age: 59
Posts: 178
Default

The molded hose is brand new. I'll try a new cap.
Reply With Quote
  #5  
Old 03-30-2010, 03:56 AM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

if radiator is plugged up, then water pump suction pressure may cause hose to collapse. Hard to believe a new hose with spring would collapse otherwise.
Does the water pump have a thermostat in it?
Reply With Quote
  #6  
Old 03-30-2010, 03:59 AM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

From another website:

"The second part of the story that has led to the "I need a spring" myth is that some people have observed their lower hose collapsing when they rev the engine. This is the result of a clogged radiator or a cooling system that has not been brought up to standard operating temperature. If an engine is revved up while still cool, there is only atmospheric pressure in the system. It is possible for the lower hose to collapse slightly due to the water pump drawing water out of the lower hose faster than the gravity-fed water from the radiator replaces it. Once the engine has been warmed up, the coolant system operates under pressure and this condition doesn't exist in a properly maintained cooling system. However, if the radiator tubes have restrictions, as the engine is revved, the water pump pulls coolant from the lower hose faster than water can trickle past the clogged tubes. This can result in a reduction in internal pressure that would cause the hose to collapse."
Reply With Quote
  #7  
Old 03-30-2010, 11:14 AM
Ray Bell's Avatar
Ray Bell Ray Bell is offline
Registered User
 
Join Date: May 2005
Location: Dalveen, Queensland
Posts: 3,236
Default

The other problem with that is that if a pump is sucking in a circular system, there must be pressure going somewhere...

A closed thermostat would prevent flow, of course, but pressures should be equalised to at least some degree.
Reply With Quote
  #8  
Old 03-31-2010, 03:17 AM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

if there is no thermostat, then it may allow the waterpump to push more water, and draw a larger suction pressure, to help collapse the hose.

also, may need to make sure system is vented of the air. I drilled a tiny 1/16 inch hole in my TS, which allows the air to vent from beneath the TS
when filling with water. Car ran cooler quicker when I hit the street.
Reply With Quote
  #9  
Old 03-31-2010, 08:26 AM
Ray Bell's Avatar
Ray Bell Ray Bell is offline
Registered User
 
Join Date: May 2005
Location: Dalveen, Queensland
Posts: 3,236
Default

I don't understand that...
Reply With Quote
  #10  
Old 04-01-2010, 02:49 PM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

Quote:
Originally Posted by Ray Bell View Post
I don't understand that...
don't understand what?
Reply With Quote
  #11  
Old 04-01-2010, 03:57 PM
bulldog426's Avatar
bulldog426 bulldog426 is offline
Registered User
 
Join Date: Apr 2008
Location: sippi
Age: 37
Posts: 868
Default

i usually run a gutted thermostat in alot of my modded up cars, try that.
Reply With Quote
  #12  
Old 04-01-2010, 11:26 PM
70 net440 70 net440 is offline
Inactive User
 
Join Date: Feb 2003
Location: Yreka, CA
Age: 59
Posts: 178
Default

T-stat was gutted by P.O. I flushed the system when I first got the car. Not a lot of crud came out. I took the car out for a bit of a drive, it didn't get hot. Hmmm.
Reply With Quote
  #13  
Old 04-02-2010, 01:16 AM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

Quote:
Originally Posted by 70 net440 View Post
T-stat was gutted by P.O. I flushed the system when I first got the car. Not a lot of crud came out. I took the car out for a bit of a drive, it didn't get hot. Hmmm.
Maybe when warms up, the increase in coolant pressure keeps the hose from collapsing.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Heater Hose George G. Leverette Restoring your MoPar (Tricks & techniques) 0 08-08-2005 05:10 PM
upper hose help!!!! macke Slant Six Chat 0 03-13-2004 05:45 AM
Lower rad hose Marvin S Performance Talk 7 07-30-2003 08:01 PM
hose help BlindsdeLebaron Performance Talk 2 11-27-2002 11:15 PM
Ram Air Hose- BilltheCat Ram Truck Chat 5 11-08-2001 10:45 PM




All times are GMT -4. The time now is 07:55 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .