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  #37  
Old 10-02-2011, 12:15 PM
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Re: WK2 GC - Reducing Hemi Engine temp

Yes Mr. Hasan, I believe it is the most cost effective path. The ULTIMATE solution is what we're talking about PLUS a larger capacity radiator. The fact that the temp needle starts to rise with harder use indicates that radiator capacity might be a bit on the marginal side. When I'm in stop and go traffic on a 100 degree day with the air blasting and towing a 23 ft boat, I don't want to see that damn needle doing ANYTHING but staying nice and low on the scale.
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  #38  
Old 10-03-2011, 07:56 AM
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Re: WK2 GC - Reducing Hemi Engine temp

Be sure to report back here next August when the temp hits 55C, I'm quite curious what will happen. That's some intense heat, I hope the Jeep can handle it in stride.
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  #39  
Old 10-05-2011, 09:13 AM
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Re: WK2 GC - Reducing Hemi Engine temp

to be honest Gents, this would be the 1st time to go through 55C+ in American car , I used to do that allot in Japanese cars , seeing from inside my car too many cars on the roads from different makes hoods up & radiator green water all over the asphalt is not a pleasant site & people sweating like ....... so to save myself the agony I am going ultra cool from now & will update you , man at that time you can even touch the cars doors from the out side or any chrome or chrome plated buttons coz it will burn your fingers so lets see I cant wait
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Old 10-18-2011, 01:01 PM
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Re: WK2 GC - Reducing Hemi Engine temp

Quote:
Originally Posted by Crestwood1001 View Post
Wouldn't cold water on hot metal cause it to crack?

Sent from my BlackBerry 9650 using Tapatalk
Does cold rain water hitting a 200* radiator cause it to crack? If so we would be in a world of trouble.
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  #41  
Old 11-26-2011, 11:01 AM
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Re: WK2 GC - Reducing Hemi Engine temp

Hi all,

I have installed the JET 180 thermostat yesterday with positive results.


Before:
Engine radiator temp. 94C 112C
Engine Oil temp. 92C 108C
Gear temp. 74C 89C

After:
Engine radiator temp. 81C 97C
Engine Oil temp. 78C 95C
Gear temp. 65C 81C



One more good news Hasan. No need to order it there is a local shop that sells it
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  #42  
Old 12-12-2011, 01:44 PM
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Re: WK2 GC - Reducing Hemi Engine temp

Quote:
Originally Posted by faisal View Post
Hi all,

I have installed the JET 180 thermostat yesterday with positive results.


Before:
Engine radiator temp. 94C 112C
Engine Oil temp. 92C 108C
Gear temp. 74C 89C

After:
Engine radiator temp. 81C 97C
Engine Oil temp. 78C 95C
Gear temp. 65C 81C



One more good news Hasan. No need to order it there is a local shop that sells it

I'm curious about this. Are you saying that the transmission cooler is part of the radiator? I thought it was separate?

Honestly, having a lower temp thermostat will do nothing for you if the actual cooling aspects of the car are not upgraded. Namely radiator, fans, oil cooler, trans cooler.

Hasan, if you really want to help prevent an overheated motor, your best bet would be to start with a large engine oil cooler. Oil retains heat a lot better than water and if you can cool your oil you will reduce your radiator load by a lot.

Also what ratio are you running for coolant to water? Simply put the best cooling agent is water, the reason we use coolant/antifreeze mixtures is to keep water in its liquid state and corrosion resistance. I'm assuming you don't have freezing issues, so lets get to boiling issues. Keep a higher water ratio to aid in cooling your vehicle. To keep water from boiling and vaporizing, you would need to swap to a slightly higher rated radiator cap. Considering our vehicles are new and in a maintained shape the increased system pressure should be ok.

If you are not towing, then I really wouldn't worry about trans temps
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  #43  
Old 12-12-2011, 02:24 PM
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Re: WK2 GC - Reducing Hemi Engine temp

I too would like to lower the engine temp. Mine constiantly wanders between 195 and 225. Not so much on the freeway but mostly in the city. Apparently this isn't due to the thermostat but the electric cooling fan. The fan won't even begin to turn on until the temps reach 220. This is not confidence building. I would like to see the temp hit 195 and lock in solid after that. I don't see how putting a lower rated thermostat is going to help when the electric fan is going to let it heat up to 220 anyway. Now if I can figure out how to fool the sensor voltage by putting a resistor in parallel and have the fan turn on sooner. I have noticed that the fan will come on sooner when running the AC. So there must be something in the programming also.
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  #44  
Old 12-12-2011, 02:49 PM
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Re: WK2 GC - Reducing Hemi Engine temp

so here's a question to you folks that are going with the "cooler is better" thinking, what temp range would you want the motor to run at and why? I think the Chrysler engineers did a fine job at asking this question and implementing solutions for these problems. 99% of climates in the US would work fine under OE conditions. I've driven through the Mojave dessert up a mountain range in 115F (46C) heat with A/C and 5 passengers/gear and the car didn't skip a beat

We have an internal combustion motor in our cars, creating hundreds of explosions every second. There will be heat - you just need to understand, how much is too much? Exhaust temps are about 1000F max 1400F, so water at a measly 225F is quite a feat no? chew on that.
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  #45  
Old 12-12-2011, 05:18 PM
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Re: WK2 GC - Reducing Hemi Engine temp

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what temp range would you want the motor to run at and why?
this.
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  #46  
Old 12-12-2011, 06:29 PM
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Re: WK2 GC - Reducing Hemi Engine temp

The idea in this case is to lower coolant temp to reduce the PCM's likelyhood/urge to retard timing due to knock. The engine is designed to run presumably on 89, you'd be surprised how much timing the PCM pulls even running on 89 octane.

Efficiency goes up with heat, but the threshold to detonation goes down. In this case, whatever allows the PCM to run with the least amount of KR possible.
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Old 12-12-2011, 07:51 PM
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Re: WK2 GC - Reducing Hemi Engine temp

The late, great Smokey Yunick:

"It is easy to see how overheating can be a problem, but I think some racers overlook the fact that it is possible to 'overcool' the engine. Some guys go to great lengths to keep the engine temperature down to 180 degrees. And, though the engine doesn't overheat, they don't realize that they're putting energy (heat) into the cooling system that could be used to produce power at the crankshaft. Running the engine at 180 degrees will drop the overall horsepower by 2%-3%. For max power the cooling temp should be at least 200 degrees...."
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  #48  
Old 12-12-2011, 08:26 PM
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Re: WK2 GC - Reducing Hemi Engine temp

Quote:
Originally Posted by andyh View Post
The late, great Smokey Yunick:

"It is easy to see how overheating can be a problem, but I think some racers overlook the fact that it is possible to 'overcool' the engine. Some guys go to great lengths to keep the engine temperature down to 180 degrees. And, though the engine doesn't overheat, they don't realize that they're putting energy (heat) into the cooling system that could be used to produce power at the crankshaft. Running the engine at 180 degrees will drop the overall horsepower by 2%-3%. For max power the cooling temp should be at least 200 degrees...."
Mr. Yunick was and still is considered a genius, but he was racing and building in a time that didnt have fancy-pants technology like knock sensors. at least outside of a engine dyno lab. He also had complete control of the fuel/spark curve. Apples to Oranges comparison.

Given the excessively sensitive nature of the PCM to retard timing (example: if it senses .5-1 degree's worth of knock, it will pull 3-5 degrees as a precaution), the above paragraph, while still valid, is made *somewhat* irrelavent because of the nature of the sensors to pull timing due to either suspected detonation, pre-ignition, or excessive IATs. And the fact that as of right now, there is no way to remove or reduce these power-robbing functions.

Engines all follow the same principles/laws , unfortunately PCM control does not.
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