| distorting upper radiator hose??? [message #200424] |
Sun, 03 March 2013 04:07  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
|
Senior Member |
|
|
I was noticing that the factory shaped upper radiator hose would get seriously distorted under higher rpm. Well primarily when I would goose the throttle up to about 3000rpm. The hose will flatten out and then go back toward normal a bit. All this was while parked. There are no external wires and it does not feel like there are any internal wires to help it maintain its round shape.
Is this normal or do I have the wrong hose?
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
[Updated on: Sun, 03 March 2013 04:09] Report message to a moderator |
|
|
|
| Re: distorting upper radiator hose??? [message #200431 is a reply to message #200424] |
Sun, 03 March 2013 06:50  |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
|
Senior Member |
|
|
| Kerry Pinkerton wrote on Sun, 03 March 2013 05:07 |
I was noticing that the factory shaped upper radiator hose would get seriously distorted under higher rpm. Well primarily when I would goose the throttle up to about 3000rpm. The hose will flatten out and then go back toward normal a bit. All this was while parked. There are no external wires and it does not feel like there are any internal wires to help it maintain its round shape.
Is this normal or do I have the wrong hose?
|
Kerry,
Something is wrong if the upper hose flattens. That is the pressure side of the water pump and should never flatten. The lower hose is the suction side and will flatten if you do not put the spring inside it. I use a hose on the bottom of the radiator to the water pump that has the spring inside the rubber. I get it from NAPA. It is 1 3/4 inch inside diameter and 23 inches long. You have to be careful to get the right one since they also have the hose with larger opening on the water pump side and it will leak. The only thing I can think of that would cause the upper hose to flatten would be in the bend if you had too much coolant flow and make it try to straighten out. If the hose is old and weak I suppose that could happen.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
|
|
|
|
| Re: distorting upper radiator hose??? [message #200433 is a reply to message #200431] |
Sun, 03 March 2013 07:12 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
|
Senior Member |
|
|
| shawnee wrote on Sun, 03 March 2013 06:50 |
| Kerry Pinkerton wrote on Sun, 03 March 2013 05:07 |
I was noticing that the factory shaped upper radiator hose would get seriously distorted under higher rpm. Well primarily when I would goose the throttle up to about 3000rpm. The hose will flatten out and then go back toward normal a bit. All this was while parked. There are no external wires and it does not feel like there are any internal wires to help it maintain its round shape.
Is this normal or do I have the wrong hose?
|
Kerry,
Something is wrong if the upper hose flattens. That is the pressure side of the water pump and should never flatten. The lower hose is the suction side and will flatten if you do not put the spring inside it. I use a hose on the bottom of the radiator to the water pump that has the spring inside the rubber. I get it from NAPA. It is 1 3/4 inch inside diameter and 23 inches long. You have to be careful to get the right one since they also have the hose with larger opening on the water pump side and it will leak. The only thing I can think of that would cause the upper hose to flatten would be in the bend if you had too much coolant flow and make it try to straighten out. If the hose is old and weak I suppose that could happen.
|
Gene,
I think that the upper hose could collapse if the lower had a wire in it and the thermostat was closed. Correct me if I am wrong, but if the thermostate was closed, coudn't the water pump could create a (for lack of a better word) "vacuum" in the lower hose, which would transfer through the radiator to the upper hose...the upper hose being the weak link, and cause it to collapse if it did not have a wire in it? Just seems to me that it could do that. Bet a wired upper hose would cure that...JWIT
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
|
|
|
|
| Re: [GMCnet] distorting upper radiator hose??? [message #200437 is a reply to message #200433] |
Sun, 03 March 2013 07:35 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Larry,
Makes sense, however, the "snout" (IIRC about 1/2" ID) on the thermostat housing allows water flow to bypass the thermostat when it
is closed so for the large upper hose to flatten the engine RPM would have to be high enough to have water flow greater than what
the "snout" could flow.
Regards,
Rob M.
-----Original Message-----
From: Larry
Gene,
I think that the upper hose could collapse if the lower had a wire in it and the thermostat was closed. Correct me if I am wrong,
but if the thermostate was closed, coudn't the water pump could create a (for lack of a better word) "vacuum" in the lower hose,
which would transfer through the radiator to the upper hose...the upper hose being the weak link, and cause it to collapse if it did
not have a wire in it? Just seems to me that it could do that. Bet a wired upper hose would cure that...JWIT
Larry :)
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: distorting upper radiator hose??? [message #200439 is a reply to message #200433] |
Sun, 03 March 2013 08:24 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
|
Senior Member |
|
|
| Larry wrote on Sun, 03 March 2013 08:12 |
| shawnee wrote on Sun, 03 March 2013 06:50 |
| Kerry Pinkerton wrote on Sun, 03 March 2013 05:07 |
I was noticing that the factory shaped upper radiator hose would get seriously distorted under higher rpm. Well primarily when I would goose the throttle up to about 3000rpm. The hose will flatten out and then go back toward normal a bit. All this was while parked. There are no external wires and it does not feel like there are any internal wires to help it maintain its round shape.
Is this normal or do I have the wrong hose?
|
Kerry,
Something is wrong if the upper hose flattens. That is the pressure side of the water pump and should never flatten. The lower hose is the suction side and will flatten if you do not put the spring inside it. I use a hose on the bottom of the radiator to the water pump that has the spring inside the rubber. I get it from NAPA. It is 1 3/4 inch inside diameter and 23 inches long. You have to be careful to get the right one since they also have the hose with larger opening on the water pump side and it will leak. The only thing I can think of that would cause the upper hose to flatten would be in the bend if you had too much coolant flow and make it try to straighten out. If the hose is old and weak I suppose that could happen.
|
Gene,
I think that the upper hose could collapse if the lower had a wire in it and the thermostat was closed. Correct me if I am wrong, but if the thermostate was closed, coudn't the water pump could create a (for lack of a better word) "vacuum" in the lower hose, which would transfer through the radiator to the upper hose...the upper hose being the weak link, and cause it to collapse if it did not have a wire in it? Just seems to me that it could do that. Bet a wired upper hose would cure that...JWIT
|
Larry,
I guess it could be possible if the hose is old and lost its resilience. I have never seen it happen, but that doesn't mean it can't. Kerry mentioned it did straighten out a little and he mentioned he had it up to 300rpm so I guess it could happen that way.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
|
|
|
|
| Re: distorting upper radiator hose??? [message #200452 is a reply to message #200424] |
Sun, 03 March 2013 10:15 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
Is the upper hose slightly too long? Those hose cutters make a nice square finished cut. Replacements often allow user final trim. Once system is pressurized to 9 lbs the pressure is everywhere. Was it still cold? Also FWIW, I heard from someone in the auto hose business that the lower spring was there only to aid with assembly line coolant fill and is not needed. Most are corroded. Anyone else heard this theory?
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
|
|
| Re: [GMCnet] distorting upper radiator hose??? [message #200466 is a reply to message #200452] |
Sun, 03 March 2013 10:51 |
John Wright
Messages: 118
Registered: September 2008
Karma: 0
|
Senior Member |
|
|
The spring in the lower hose known as the suction side of the pump hose is there to prevent the hose from collapsing when the rpm increase or when the thermostat opens increasing the flow out of the pump. The suction side is also at a slight negative pressure most of the time and increases more negative during higher flow rates.
J.R. Wright
30' Buskirk Stretch
Michigan
On Location in Florida
On Mar 3, 2013, at 11:15 AM, John R. Lebetski <gransport@aol.com> wrote:
>
>
> Is the upper hose slightly too long? Those hose cutters make a nice square finished cut. Replacements often allow user final trim. Once system is pressurized to 9 lbs the pressure is everywhere. Was it still cold? Also FWIW, I heard from someone in the auto hose business that the lower spring was there only to aid with assembly line coolant fill and is not needed. Most are corroded. Anyone else heard this theory?
> --
> John Lebetski
> Chicago, IL
> 77 Eleganza II
> Source America First
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
