Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
Steel lower rad hose, Big Block #2464531
03/11/18 12:26 AM
03/11/18 12:26 AM
Joined: Mar 2005
Posts: 2,060
Pendleton NY
T
terzmo Offline OP
top fuel
terzmo  Offline OP
top fuel
T

Joined: Mar 2005
Posts: 2,060
Pendleton NY
I have a 472 hemi in a 67 R/T that runs cool in hot weather in traffic and down the road for what I say are short high speed runs. At 65 to 70 mph the temp will rise over 200 (slowly) if kept at the speed. Slow to 50-55 and the temp will go down. Alum rad with stock waterpump. I'm thinking a problem "could" be the lower hose collapsing at higher RPM. Does anyone use a non stock rigid or flex metal lower hose ?

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464533
03/11/18 12:33 AM
03/11/18 12:33 AM
Joined: Jan 2003
Posts: 5,442
Indiana
Y
YO7_A66 Offline
master
YO7_A66  Offline
master
Y

Joined: Jan 2003
Posts: 5,442
Indiana
Is there a chance that this might be a carb tuning issue when the primary circuit transitions in?

I recently asked a local parts store why the newer lower hoses did not come with a wire. They said that the manufacturers are using better rubber materials that no longer require the wire insert which prevents collapse.
How old is your lower hose?


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Steel lower rad hose, Big Block [Re: terzmo] #2464541
03/11/18 01:12 AM
03/11/18 01:12 AM
Joined: Apr 2010
Posts: 43
Liberty, NC
D
djenkins83 Offline
member
djenkins83  Offline
member
D

Joined: Apr 2010
Posts: 43
Liberty, NC
Here is what we purchased for both our big block cars. It's for a Ford hose but it works just fine.

https://www.cjponyparts.com/lower-radiat...5-1973/p/HW769/

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464566
03/11/18 02:36 AM
03/11/18 02:36 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
You may need more radiator


live every 24 hour block of time like it's your last day on earth
Re: Steel lower rad hose, Big Block [Re: terzmo] #2464568
03/11/18 02:41 AM
03/11/18 02:41 AM
Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
topside Online content
Too Many Posts
topside  Online Content
Too Many Posts

Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
Problem could also be the coolant isn't spending enough time in the radiator due to the thermostat being too low a temp setting.

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464569
03/11/18 02:46 AM
03/11/18 02:46 AM
Joined: Jan 2003
Posts: 32,883
Grand Prairie,Texas
stumpy Online content
I Win
stumpy  Online Content
I Win

Joined: Jan 2003
Posts: 32,883
Grand Prairie,Texas
That's an old wives tale.

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464587
03/11/18 03:46 AM
03/11/18 03:46 AM
Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
topside Online content
Too Many Posts
topside  Online Content
Too Many Posts

Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
Oh, OK. Never mind, then.

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464588
03/11/18 03:48 AM
03/11/18 03:48 AM
Joined: Jul 2011
Posts: 953
Chicago
PurpleBeeper Offline
super stock
PurpleBeeper  Offline
super stock

Joined: Jul 2011
Posts: 953
Chicago
Overheating at highway speed is a sign that you're either not getting enough air flow...like electric fans blocking the radiator...or the radiator is too small. Another possibility is that someone accidentally used 100% antifreeze instead of 50/50


70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"
Re: Steel lower rad hose, Big Block [Re: PurpleBeeper] #2464601
03/11/18 04:22 AM
03/11/18 04:22 AM
Joined: Jan 2003
Posts: 17,507
Las Vegas, NV
6bblgt Offline
I Live Here
6bblgt  Offline
I Live Here

Joined: Jan 2003
Posts: 17,507
Las Vegas, NV
I believe a couple responses are confused taken out of order

the coil spring inside the lower hose is an aid on the assembly line where the cooling system is filled under vacuum

& if your cooling system is developing proper pressure, the hose is not going to collapse

Re: Steel lower rad hose, Big Block [Re: 6bblgt] #2464602
03/11/18 04:26 AM
03/11/18 04:26 AM
Joined: Jan 2003
Posts: 17,507
Las Vegas, NV
6bblgt Offline
I Live Here
6bblgt  Offline
I Live Here

Joined: Jan 2003
Posts: 17,507
Las Vegas, NV
if you can't maintain temperature & it is exceeding your thermostat rating - the excellent flow & open thermostat may not allow the fluid to spend enough time in the radiator to cool

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464606
03/11/18 04:49 AM
03/11/18 04:49 AM
Joined: Feb 2003
Posts: 8,658
A
Andrewh Offline
master
Andrewh  Offline
master
A

Joined: Feb 2003
Posts: 8,658
you do not mention what fan or shroud you are using.

I agree, if it can keep up in town, air restrictions are hurting you on the freeway.

The fact it is coming back down at 55 tells me you have enough radiator and it is spending enough time there.

Something is blocking air flow.

It might still be possible that your lower hose is collapsing, and you could test that by staying in a lower gear at 55 so your rpm is higher.
if it starts creeping up, then I would use the steel hose with the rubber ends.
http://www.jegs.com/i/JEGS/555/511241/10...DYaAl-yEALw_wcB

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464736
03/11/18 02:08 PM
03/11/18 02:08 PM
Joined: Mar 2005
Posts: 2,060
Pendleton NY
T
terzmo Offline OP
top fuel
terzmo  Offline OP
top fuel
T

Joined: Mar 2005
Posts: 2,060
Pendleton NY
mechanical fan with schroud...no blockage. Now....IF the engine is working harder at high speed, it may be generating too much heat for the Alum rad I have in now. The motor has a nice cam/stroked and stock bore. It's also a waterblock. It's got to be the hose or rad and the hose is easier and cheaper to try.Thanks to all. (the coolant is newer and 50/50)(stat is not a player unless not opening and it opens)

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464850
03/11/18 06:32 PM
03/11/18 06:32 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
You might be able to coil a welding rod in the hose to confirm/elim that potential without any expenditure. Post what it ends up being. EDIT with more thought, you could (in your driveway) run it up to the RPM that it is acting up at on the highway & see if the hose starts to suck shut. water flow is the same at a given RPM so it it is doing it at speed it will do it in your driveway at rest. this will quickly resolve that potential.

Last edited by RapidRobert; 03/12/18 09:46 AM.

live every 24 hour block of time like it's your last day on earth
Re: Steel lower rad hose, Big Block [Re: terzmo] #2464876
03/11/18 07:34 PM
03/11/18 07:34 PM
Joined: Jan 2003
Posts: 27,444
So Cal
autoxcuda Offline
Too Many Posts
autoxcuda  Offline
Too Many Posts

Joined: Jan 2003
Posts: 27,444
So Cal
Are you running a hood to radiator support seal?

Is it an aftermarket radiator. Many of the aluminum radiators don’t seal well on the slides to the radiator support. So air spills right around the radiator.

Re: Steel lower rad hose, Big Block [Re: terzmo] #2464884
03/11/18 07:48 PM
03/11/18 07:48 PM
Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar Offline
master
BigBlockMopar  Offline
master

Joined: Jan 2003
Posts: 3,575
The Netherlands
The shroud could actually act as a limiter when too much air tries to enter through the radiator.
Some shrouds have rubber flaps that open up when enough airflow is there.

Also most likely that underhood air can't escape the engine bay fast enough causing lower airflow through the radiator and engine heat is building up.

A front spoiler can create some lower pressure behind it which could in turn help evacuate hot underhood air and aid overal cooling.

Re: Steel lower rad hose, Big Block [Re: BigBlockMopar] #2464969
03/11/18 10:38 PM
03/11/18 10:38 PM
Joined: Mar 2005
Posts: 2,060
Pendleton NY
T
terzmo Offline OP
top fuel
terzmo  Offline OP
top fuel
T

Joined: Mar 2005
Posts: 2,060
Pendleton NY
Originally Posted By BigBlockMopar
The shroud could actually act as a limiter when too much air tries to enter through the radiator.
Some shrouds have rubber flaps that open up when enough airflow is there.

Also most likely that underhood air can't escape the engine bay fast enough causing lower airflow through the radiator and engine heat is building up.

A front spoiler can create some lower pressure behind it which could in turn help evacuate hot underhood air and aid overal cooling.


I don't see the shroud as suggested is an issue at high speed

Re: Steel lower rad hose, Big Block [Re: terzmo] #2465035
03/12/18 12:29 AM
03/12/18 12:29 AM
Joined: Aug 2003
Posts: 1,144
ontario calif
N
ns1aar Offline
super stock
ns1aar  Offline
super stock
N

Joined: Aug 2003
Posts: 1,144
ontario calif
Had that with bad head gaskets


NS1AAR
Re: Steel lower rad hose, Big Block [Re: ns1aar] #2465111
03/12/18 10:10 AM
03/12/18 10:10 AM
Joined: Mar 2005
Posts: 2,060
Pendleton NY
T
terzmo Offline OP
top fuel
terzmo  Offline OP
top fuel
T

Joined: Mar 2005
Posts: 2,060
Pendleton NY
not having any coolant issues or performance

Re: Steel lower rad hose, Big Block [Re: ns1aar] #2465154
03/12/18 12:11 PM
03/12/18 12:11 PM
Joined: Aug 2003
Posts: 1,144
ontario calif
N
ns1aar Offline
super stock
ns1aar  Offline
super stock
N

Joined: Aug 2003
Posts: 1,144
ontario calif
Performance, car would run fine until up to 65-70MPH and the temp would climb but ran fine at slower speeds. Head gaskets were bad

Last edited by ns1aar; 03/12/18 12:12 PM.

NS1AAR
Re: Steel lower rad hose, Big Block [Re: terzmo] #2465329
03/12/18 06:22 PM
03/12/18 06:22 PM
Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar Offline
master
BigBlockMopar  Offline
master

Joined: Jan 2003
Posts: 3,575
The Netherlands
Don't rule out air backing up under the hood at high speeds just yet.
One way to make sure/rule out is to install mbar manometers in front and rear of radiator support and run lines into the cabin to view them.

Unlikely, but headgasket issues would also show up after shutting the engine off and restarting it shortly after when coolant pressure is injecting coolant into a cylinder. But it's more likely engine combustion pressure is making its way into the cooling system when the engine is running hard.
Hard radiator hoses would be a result of that until pressure drops again.

Where's your timing at at higher speeds?
Fast/Slow curve?
Vacuum advance hooked up?
Late timing will cause warmer running engine.

Page 1 of 2 1 2






Powered by UBB.threads™ PHP Forum Software 7.7.1