Running hotter on highway !
#339726
06/06/09 04:01 PM
06/06/09 04:01 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
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IL, Aurora
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in traffic it will stay around 180, expressway it will slowly creap to 190 - 195 never took it on the expressway for more than about 30 min so don't know how hi it will climb. it a 360 with 11.0 cr blocked heat risers single plane, j heads, 14 initial, 33 total msd ignition no vacuum advance, tti headers 2 1/2" exhaust, jetting looks good already played with timing and jetting with no diff, has 4 core 22" stock style rad thats clean, has stock shroud, 5 blade mopar 18.5" clutch fan out of 70's car, stock replacement water pump, belts tight, 160 t-stat, had 180 hi flow same problem. ??? I have a 7 blade "215" fan thats for my demon will this make a diff, even though my problem seems to be at 65 MPH?
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Re: Running hotter on highway !
[Re: ahy]
#339732
06/06/09 08:55 PM
06/06/09 08:55 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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I Live Here
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Mass
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Quote:
Agree 190-195 isn't overheating but running hotter on the highway is unusual.
not if your running 3:91/4:10 gear or small diameter tires with high gears, and pulling down some healthy RPM, temps going to rise in that case
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Re: Running hotter on highway !
[Re: RobX4406]
#339734
06/08/09 01:32 AM
06/08/09 01:32 AM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
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Ya, sealed to carb, 3.55 gear 25.3" tires, pulls around 3 to 3200 rpm's 65, 70mph. I know 195 is not overheating just kind of odd with the thick 4 core, shroud, 5 blade clutch fan, ect.. ect.. that it would still climb, just wondering what if i go on a 1 or 3 hour expressway trip.
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Re: Running hotter on highway !
[Re: 318 Stroker]
#339738
06/08/09 12:34 PM
06/08/09 12:34 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
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I Live Here
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Florida
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 could be sucking the lower hose closed check for a spring in it add one if its not in there also check flow of rad a/c or non-a/c ? right pulleys with the right # of vanes on the pump? I bump all my 5 blade fans up to 7 blades on a themo fan clutch changing the anti freeze yearly is good but does not mean it will not have settament in the core of the rad do you back flush it when changing the freeze? does not sound bad right now..but it could be heading that way on the temp rizing up at speed 
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Re: Running hotter on highway !
[Re: scratchnfotraction]
#339739
06/08/09 01:15 PM
06/08/09 01:15 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
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I Live Here
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Quote:
could be sucking the lower hose closed
check for a spring in it
add one if its not in there
also check flow of rad
a/c or non-a/c ?
right pulleys with the right # of vanes on the pump?
I bump all my 5 blade fans up to 7 blades on a themo fan clutch
changing the anti freeze yearly is good but does not mean it will not have settament in the core of the rad
do you back flush it when changing the freeze?
does not sound bad right now..but it could be heading that way on the temp rizing up at speed
I never understood the bottom hose collapsing theory.
Coolant heats up and pressure BUILDS in the system. My hoses are pumped up from the pressure. To think that a water pump could cause a vacuum where there was once 8-15 psi pressure seems unrealistic to me. I bet you had a bad cap or low fluid.
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Re: Running hotter on highway !
[Re: aarcuda]
#339741
06/08/09 01:29 PM
06/08/09 01:29 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
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I Live Here
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Florida
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no, a rubber hose gets weak over time
they all used to have a spring in them,but todays rubber is more stiffer,heat,oil,ozone resistant and last longer,there for will not suck flat as often...but they can and do...even a new one can,IMO
the pressure cap help build presssure and combind with anti freeze raise the boiling point, the pressure helps force the water into the small passages to keep hot spots/steam pockets from forming in the heads
the pump does move a good bit of water at idle,but when the revs go up,its sucking harder than it can push the mass of water through the restrictions in the engine cooling sytem
the sucktion build up and sucks the hose closed
I use a sainless wire so it does not rust my self and wrap it around something a little smaller that the ID of the lower rad hose,I make it long as the hose
I have dug a many of rusted up pieces of spring from out of the pumps and even had some wraped around the impellers over the yrs
with a weak hose you can stand there and rev the engine by hand and watch it suck closed
seen this on ferds,chibbys,and mopars
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Re: Running hotter on highway !
[Re: scratchnfotraction]
#339742
06/08/09 05:08 PM
06/08/09 05:08 PM
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Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
Magnum
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Posts: 5,791
Hamilton, Ontario Canada
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I suspect the radiator. It's not the fan. At 65mph the fan is of no importance.
While I also would not worry about 15 deg over my thermostat temperature. A proper cooling system should ALWAYS stay at thermostat temperature unless you have an electric fan and you are stopped, waiting for it to come on.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Running hotter on highway !
[Re: scratchnfotraction]
#339744
06/08/09 06:02 PM
06/08/09 06:02 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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Quote:
no, a rubber hose gets weak over time
they all used to have a spring in them,but todays rubber is more stiffer,heat,oil,ozone resistant and last longer,there for will not suck flat as often...but they can and do...even a new one can,IMO
the pressure cap help build presssure and combind with anti freeze raise the boiling point, the pressure helps force the water into the small passages to keep hot spots/steam pockets from forming in the heads
the pump does move a good bit of water at idle,but when the revs go up,its sucking harder than it can push the mass of water through the restrictions in the engine cooling sytem
the sucktion build up and sucks the hose closed
I use a sainless wire so it does not rust my self and wrap it around something a little smaller that the ID of the lower rad hose,I make it long as the hose
I have dug a many of rusted up pieces of spring from out of the pumps and even had some wraped around the impellers over the yrs
with a weak hose you can stand there and rev the engine by hand and watch it suck closed
seen this on ferds,chibbys,and mopars
i agree that the hoses today seem sturdier but if you have a weak hose, why geta spring for it. the spring may keep it from collapsing but the right fix is a new BETTER hose.
Plus, for suction to happen in a closed system, you need a restriction. if the bottom hose is collapsing and the top hose is pressurized, then I'd say your radiator is clogged all to heck and coolants not flowing.
here the guy is running normal temps but he's worried. theres no need to worry about the temps he posted so theres no real reason to suspect a problem with anything in his system- even the springless bottom hose
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.....the 190-195 is fine, just the engine being worked!
