Possible Solutions to Lower Heat - JeepForum.com

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post #1 of 21 Old 06-11-2010, 03:11 PM Thread Starter
Keith
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Possible Solutions to Lower Heat

Besides a beefier radiator and electric fan are there any notable modifications or upgrades that make significant heat differences.


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post #2 of 21 Old 06-11-2010, 03:17 PM
Coiz
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Like you said, bigger radiator, bigger fan, air shrouds are important. You can also lower your coolant to water ratio as water transfers heat better than glycol. Just keep enough glycol in there to keep the freeze protection you will need for your area. If you have no threat of freezing you can actually run 100% water and just add some water wetter or purple ice to keep the corrosion protection and water pump lubrication intact. That's what we do for our race bikes.

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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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post #3 of 21 Old 06-11-2010, 03:28 PM
h2ojeep
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Just worked on my this week. It has been getting hot in this 100+ West Texas heat.

I put my fan shroud back on (left it off after a 1 in body lift this winter) and also went from a 4 blade fixed pitch fan to a 6 blade flex fan. It is pulling so much air at idle, I am afraid for small children to walk by for fear of having them sucked in.

Also, dumb me, check your coolant level. I drained less than I re-installed (recovered about 99% when draining) meaning my level was probably low and at least adding to the problem.
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post #4 of 21 Old 06-11-2010, 03:47 PM
mcmud
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Though generally not thought of as either a modification or upgrade an adequate amount of ignition advance timing along with a well tuned carb will help to hold the temp down.
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post #5 of 21 Old 06-11-2010, 04:46 PM
turbogus
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Just to relate a shroud story from my ill spent youth. Way back when I bought a well used '66 Econoline van to keep my junk in. It ran out okay and in fact was the first (and only) turn key vehicle I ever had. The thing always ran hot on the open road. From time to time the company I drove for would have me hold over in Portland, OR where there was one of the few wrecking yards that didn't send their old stuff to the crusher. I found a '65 and a '67 whose parts I occasionally scavenged. One time I saw at the top of a three car stack another econoline~with a belly pan. I recalled from my hot rod days with a '66 Malibu with a 30-30 cammed motor that ran hot~until I installed a shoud. I unbolted the thing and ran it back home to Toledo, OR and bolted it up-from then on it wouldn't come up to full operating temperature on account of all the other cooling mods I had made. (oversized radiator, high flow water pump, etc.)

The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
We cannot accurately judge the trajectory of a speeding critter (cat, dog, sasquatch)
Record heat waves and floods only occur when we visit that area
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post #6 of 21 Old 06-11-2010, 06:04 PM
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I've been wanting to post a question here on engine temp. My '77 AMC 360 has the stock radiator, and a 4 blade fan. I did not get a shroud when I bought the Jeep. With the high heat lately, I've kept an eye on my temp gauge. I must have a 180 degree thermostat, because it gets up to that heat pretty quickly, then stops there. I've not had it get much hotter than that, including tonight when I was on the highway in 90 degree weather for 30 minutes in stop and go traffic. Its only going to get hotter here though, so I wasn't sure if I should do any upgrades to help it stay cooler for longer. It hits 180 pretty quickly, even on 70 degree mornings.
I have drained and flushed the system, and added water wetter to it. Any other suggestions?
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post #7 of 21 Old 06-12-2010, 08:43 AM
turbogus
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That's a pretty good sign that your thermostat's working Dborns. 'Betty' goes the same way.

The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
We cannot accurately judge the trajectory of a speeding critter (cat, dog, sasquatch)
Record heat waves and floods only occur when we visit that area
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post #8 of 21 Old 06-12-2010, 12:55 PM
Bubba Ray
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Maybe try some hood vents.
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post #9 of 21 Old 06-12-2010, 09:55 PM
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At least a 3-core radiator, factory shroud, replace mechanical fan with a big 7-blade thermal clutch fan from a FSJ.

Beyond that, you can try to move all the air into the engine compartment you want, but its useless if you can't evacuate it. If the engine compartment is a significantly higher-pressure area, the air just won't move effectively. Hood louvers are an outstanding way to make that happen.

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post #10 of 21 Old 06-14-2010, 09:10 AM
Gunga
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Hood louvers. www.raceace.com

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post #11 of 21 Old 06-14-2010, 09:19 AM
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Try Royal Purple coolant!!

Purple Ice is a high performance, synthetic, radiator coolant additive. It reduces engine heat by reducing the surface tension of the radiator fluids for improved heat transfer.
Purple Ice fosters optimum coolant flow by helping to prevent formation of scale deposits in the radiator. It also lubricates the water pump seals.
Purple Ice should always be used in conjunction with antifreeze in regions where freezing temperatures occur. Purple Ice is recommended for any water / glycol pressurized cooling system, including those using the traditional green silicate based glycols or the newer OAT or HOAT based glycols.

Street Thunder magazine
endorses Purple Ice

read more

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post #12 of 21 Old 06-14-2010, 11:12 AM Thread Starter
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Anyone have any photographs of hood louvers installed?

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post #13 of 21 Old 06-14-2010, 11:52 AM
Coiz
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Oh, I can't miss the chance to show these off. I had mine directly stamped into the hood at a custom Hotrod shop. I wasn't to keen on the rivet on style although I'm sure they are fine. Once I get the Jeep running, I plan to check the under hood temps at extended idle then again at steady cruise with them opened up then check it again with them taped off to see the difference. You can see more louvers in this thread.

Mike
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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post #14 of 21 Old 06-15-2010, 04:10 PM
Bubba Ray
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Someone here has some neat hood vents that go on the sides of the hood. No worries about rain.
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post #15 of 21 Old 06-15-2010, 04:18 PM
kakai81
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Hood louvers

Quote:
Originally Posted by Bubba Ray View Post
Someone here has some neat hood vents that go on the sides of the hood. No worries about rain.
That was a guy from Bali, the vents looked like gills. He did just about everything cool that you could do to a jeep.

If you add better fans and coolant properties, and still can't get the temp down, try a new t-stat. One that opens at a lower temp. At least it'll get the water moving sooner.
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