Re: Steel lower rad hose, Big Block
[Re: terzmo]
#2464533
03/11/18 12:33 AM
03/11/18 12:33 AM
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Joined: Jan 2003
Posts: 5,446 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,446
Indiana
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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.)
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Re: Steel lower rad hose, Big Block
[Re: terzmo]
#2464566
03/11/18 02:36 AM
03/11/18 02:36 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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You may need more radiator
live every 24 hour block of time like it's your last day on earth
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Re: Steel lower rad hose, Big Block
[Re: terzmo]
#2464588
03/11/18 03:48 AM
03/11/18 03:48 AM
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Joined: Jul 2011
Posts: 972 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 972
Chicago
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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"
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Re: Steel lower rad hose, Big Block
[Re: PurpleBeeper]
#2464601
03/11/18 04:22 AM
03/11/18 04:22 AM
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Joined: Jan 2003
Posts: 17,546 Las Vegas, NV
6bblgt
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,546
Las Vegas, NV
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I believe a couple responses are 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
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Re: Steel lower rad hose, Big Block
[Re: terzmo]
#2464606
03/11/18 04:49 AM
03/11/18 04:49 AM
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Joined: Feb 2003
Posts: 8,757
Andrewh
master
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master
Joined: Feb 2003
Posts: 8,757
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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
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Re: Steel lower rad hose, Big Block
[Re: terzmo]
#2464850
03/11/18 06:32 PM
03/11/18 06:32 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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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
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Re: Steel lower rad hose, Big Block
[Re: BigBlockMopar]
#2464969
03/11/18 10:38 PM
03/11/18 10:38 PM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
OP
top fuel
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OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
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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
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Re: Steel lower rad hose, Big Block
[Re: ns1aar]
#2465154
03/12/18 12:11 PM
03/12/18 12:11 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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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
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