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overheating
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Jun 16, 2011 1:07 am    Post subject: overheating Reply with quote

we have a Willis at work that we just cant seem to get to stay cool. its a new engine. 430 (ish) cubic inch Hemi. it dynoed at 650 HP at the flywheel. it has a factory water pump with a V-belt. timing is 10 to 14 base (sorry i dont remember exactly where i put it the last time). radiator is aluminum and supposed to be good for 800 HP. it has dual electric fans. any other details i left out please ask.

it runs at about 210-220 when driving. get it down to low speeds (such as stop & go traffic) it gets over 230. once its hot it doesnt want to cool down. if you keep driving it on the highway, it never really goes past 220. i took the thermostat out and you can guess what effect that had. tried letting it idle with the hood open, thinking maybe it wasnt flowing enough air through that tiny engine compartment, and its still hot. even tried driving with the heater on and it made no difference. belt doesnt seem to be slipping but we are thinking of trying a Mizere (sp) electric water pump. the thought did cross my mind that that radiator just is not getting the job done. problem is that theres no room for anything physically bigger. any thoughts or suggestions ?

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af2
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1933 Willys Coupe

PostPosted: Thu Jun 16, 2011 12:13 pm    Post subject: Reply with quote

What year Willys?
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Thu Jun 16, 2011 12:24 pm    Post subject: Reply with quote

Thermostat Temp or restrictor washer?

Pressure cap rating might need to be higher sounds like air pockets are forming once it gets hot.

Ribbed flex hoses have poor flow characteristics too. Get rid of them if they are on there.

Redline water wetter and anti freeze to -10F is a good combo for max heat capacity too.

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Last edited by Paul P on Thu Jun 16, 2011 12:31 pm; edited 1 time in total
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Jun 16, 2011 12:27 pm    Post subject: Reply with quote

willis is a 41. no ribbed hoses. it got to the same temps without the t-stat. it just took longer to get there. you can see the car if you go to our website and watch the video.... www.dooleyandsons.com
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Thu Jun 16, 2011 1:08 pm    Post subject: Reply with quote

Can't find the video but that radiator is short/small and airflow is not that good. Tough problem when the body just won't allow for the proper size radiator for the power plant or airflow through it. Thicker or double stack radiator possible? Capacity is what you need in the radiator/radiators.

Higher pressure and the water wetter/coolant ratio will help too.

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af2
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1933 Willys Coupe

PostPosted: Thu Jun 16, 2011 7:49 pm    Post subject: Reply with quote

The car is nice!!! But customers don't want to see the radiator and that is too bad. You/he needs double the area of what is in there.
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af2
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1933 Willys Coupe

PostPosted: Thu Jun 16, 2011 7:51 pm    Post subject: Reply with quote

10sec.et wrote:
willis is a 41

You keep calling it a Camero! Shocked
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Jun 16, 2011 8:58 pm    Post subject: Reply with quote

af2 wrote:
10sec.et wrote:
willis is a 41

You keep calling it a Camero! Shocked


Confused Camaro?????

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William Jones
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1971 Ford Mustang

PostPosted: Thu Jun 16, 2011 9:11 pm    Post subject: Reply with quote

What psi cap are you running. I had a Clevleand we had this problem with. I went from a 8lb cap to a 12-14lb cap and it drop the temps 20 degrees. Higher pressure helps heat transfer but slows water movement.

Bam

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Jun 16, 2011 11:05 pm    Post subject: Reply with quote

the radiator cap that was on it was junk. we robbed one off of another car but it could be crap too. tomorrow ill get them to order a 16# cap. i think they are going to want to try the Mizere water pump next. looking at the one that flows 55 gph. other than that, only thing i can think to do is add a small supplemental radiator underneath in the back of the car.
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Big Dave
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PostPosted: Thu Jun 16, 2011 11:12 pm    Post subject: Reply with quote

Air flow could be an issue. That nose area was fairly small and it may be slicing through the air instead of building pressure in front of the radiator the way a fenderless car dose with a six foot wide by three foot tall radiator core support to act as an air dam. Any chance of putting a chin spoiler on it to force more air to pile up in front of the car?

Big Dave
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Fri Jun 17, 2011 12:51 am    Post subject: Reply with quote

Big Dave wrote:
Air flow could be an issue. That nose area was fairly small and it may be slicing through the air instead of building pressure in front of the radiator the way a fenderless car dose with a six foot wide by three foot tall radiator core support to act as an air dam. Any chance of putting a chin spoiler on it to force more air to pile up in front of the car?

Big Dave


wouldnt be able to put anything obvious on the front but i wonder if an air dam under the front (like the corvettes and f-bodies have) would help.

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Knarley Darley
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PostPosted: Fri Jun 17, 2011 3:16 am    Post subject: Reply with quote

16 pound cap will at least keep it sealed longer at temp, and keep a little more coolant in the radiator instead of puked into the over flow bottle. May be why it never recovers once it is hot. I dont think it will do much to lower the temp. The electric pump is probably not going to make any difference either. I have added heater cores mounted remotely and the temp drops 10 to 20 degrees for each one added, especially if you can get it away from the engine compartment. The Aluminum ones work best.
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Skunkworkx
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1968 Chevrolet Camaro

PostPosted: Fri Jun 17, 2011 8:58 am    Post subject: Reply with quote

these dual electric fans.... are they the open type with no shroud ?

like this...http://static.summitracing.com/global/images/prod/small/sum-g4904_cp_s.jpg


Then try a model with a shroud....made a big difference on my car

like this....http://static.summitracing.com/global/images/prod/small/SUM-G4852_s.jpg

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1979 Chevrolet Camaro

PostPosted: Fri Jun 17, 2011 1:39 pm    Post subject: Reply with quote

Water Wetter worked for me, I'd give it a shot.
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