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Author Topic:   Cooling tips, anyone????
Blind Barney
Dirt Maniac

Total posts: 120
posted August 02, 2005 08:31 PM  
I run a hobby stock. I come in at 235 at the end of a race. I run the premixed 50/50 stuff, added a bottle of water wetter just cause it was sitting there and I have a 3 core rad. I have a later model Grand Prix nose with the bottom cut out as well as the 2 bigger holes above that are the Grand Prix signature sort of trademark. I run a 6 blade flex fan (just switched from a steel 4 blade). I also have no schrowd(spX) between the rad and the nose. The lack of a schrowd is probably a big part of it but the later model nose sticks out so far in front the shrowd it would be goofy long. Any tips, tricks or advice?

wrenchturner10
Dirt Forum Racer

Total posts: 80
posted August 02, 2005 08:36 PM  
Drain the cooling system and get rid of the antifreeze, use distilled water and a bottle of water wetter or purple ice. The anti freeze dosen't help you cool, it keeps the water from freezing.

sc1 racing
Dirt Freak

Total posts: 419
posted August 02, 2005 09:09 PM  
exactly get rid of the antifreeze. i run faucet watter and the 40 below coolant treat ment..but i would sugest you get a goo shroad....

Tire Killer
Dirt Full Roller

Total posts: 47
posted August 02, 2005 09:56 PM  
Definatly get a good shroud that will have the fan 1/2 in and 1/2 out. Also in my opinion I would get a 5 blade steel fan and get rid of the flex fan, it might be flatening out at the higher rpm's and not doing its job. Thats just been my experiance with one. And like everyone else so far I agree with getting rid of the 50/50 and just using the 2 mentioned addatives with water.

Tire Killer
Dirt Full Roller

Total posts: 47
posted August 02, 2005 10:01 PM  
1 more thing, not sure I understand your reasoning about not having a shroud! It goes between the radiator and fan, not radiator and nose?

nice_guy_wi
Dirt Maniac

Total posts: 120
posted August 02, 2005 10:23 PM  
He is talking about the air dam out front. Goofy long or not I would build one. Make it out of plastic, weighs almost nothing and does the job just fine. Make sure you leave some sticking out the bottom to force the air up as you are running. We like the steep pitched 4 blade steel fan. A big aluminum radiator helps as well.

marshalr
Dirt Maniac

Total posts: 148
posted August 03, 2005 10:13 AM  
About 30% antifreeze will RAISE the boiling point of the water. That is the key benefit of antifreeze, corrision resistance and lubrication of the water pump are secondary, but important.
Your car may run 10 degrees hotter with antifreeze, but the the water won't boil until 230 or 240. Without antifreeze you risk boiling the water....creating steam pockets....ruining your engine at 215 on the gauge.
Water Wetter, softeners.....blah blah blah. They might help. Get air out of the system, fill it with water when cold. Get lots of air through the radiator and the thing will cool.
Radiator is a heat exchanger, water to air, if you have a poor flow through the radiator, there is no air to carry away the heat, all the mumbo jumbo chemistry in the universe won't fix it.

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Some People Race For A Living; I Live To Race

backwoodsracer
Dirt Forum Racer

Total posts: 88
posted August 03, 2005 03:40 PM  
Lose the anti-freeze use an aluminum radiator and a racing water pump with 1-1 pulleys.Build a good shroud and I suggest a high pitch 4-blade steel fan.The 4-blade seems to pull a lot more air than anything else I have used even a 6-blade fan.Whith this setup my car only goes to 200 on the hot/humid nights and about 180-190 other cooler nights.

racer17j
Dirt Forum Champ
Total posts: 5390
posted August 03, 2005 04:22 PM  
Yes, a shroud would help big time. We made ours out of body aluminium and it works fine, might take a little engineering to get it right but well worth the effort.

racer17j
Dirt Forum Champ
Total posts: 5390
posted August 03, 2005 07:40 PM  
The fan I run now which is a 4 blade with square ends on it and is really pitched.

keeps all my 406s at 180-190 all night. I have never gotten above that.

I run 1-1 straight water noghing else.

All my motors are 12-14-1 compression.

I got the fan from total performance parts in omaha, its 18.5 inches and pitched more and squarer than the afco. which I overheated with.

ARMallardSlayer
Dirt Maniac

Total posts: 175
posted August 04, 2005 05:56 AM  
We run a afco aluminum radiator, billet pulleys, a good shroud, and water....no antifreeze........and we have never had any type of overheating problem.....we also run a plastic fan blade.

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If you can't work em in close & git em in your face with their orange landing gear down, don't bother taking the safety off......

Mikey14
Dirt Freak

Total posts: 265
posted August 04, 2005 10:33 AM  
get rid of your flex fan and put the four blade back on. GM also makes a good four blade 19 inch fan that pulls air like crazy.

Build a good shroud between the motor and the radiator around that four blade and you wont need an air box on the front.

tin cup
Dirt Full Roller

Total posts: 40
posted August 04, 2005 03:17 PM  
I usually run anti-freeze,but i'm looking to try something new. I'm in the middle of an engine change. How much water wetter should I put in a dry system? And is purple ice better?

The Flash32
Dirt Maniac

Total posts: 120
posted August 04, 2005 04:00 PM  
Kevin, I just use one bottle in mine with a 50-50 mix. Getting ready to go to the distilled w/water wetter though.

wrenchturner10
Dirt Forum Racer

Total posts: 80
posted August 04, 2005 05:34 PM  
A good source of distilled water is out of your home dehumidifier. It is pulled from the air and you can't get much more distilled than that. Tin Cup, I've used both water wetter and purple ice and I don't see any noticeable differance to say one is better than the other. Also another home source of distilled water is the drain from a whole-house ac unit where it drains from the a-coil in the furnace plenum. Why throw it out when it has other good uses.

[This message has been edited by wrenchturner10 (edited August 04, 2005).]

MiPinto6
Dirt Maniac

Total posts: 118
posted August 04, 2005 08:05 PM  
One other thing to consider is the radiator height. We chased our tails for half a season on a mod because the highest point of the cooling system was inside the head. The radiator needs to be highest or get a gooseneck that has the radiator cap on it and fill from there.

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Thanks, Rob
(Cold Blooded Racing)

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted August 05, 2005 08:34 AM  
The air box between the nose and the radiator is the best kept secret in racing. Back when the nose and box was new on my car, I ran electric fans and didn't even need them to be on under green. The best fan/shroud in the world can't duplicate that 50 mile an hour wind if you harness it and force it thru the radiator fins.

frenchtech
Dirt Roller

Total posts: 6
posted August 05, 2005 09:54 AM  
If all else fails, you can try putting a couple drops of dawn dish soap in your cooling system. This works well and actually brought our temp down 30 to 40 degrees. Alot cheaper than water wetter and purple ice. You also might want to make sure your shroud fits closly around the fan. 1/2 in and 1/2 out.

Blind Barney
Dirt Maniac

Total posts: 120
posted August 07, 2005 08:48 PM  
I put the steel 4 blade fan back on and it helped some, not lots but I did notice a difference. Every little bit helps.

    

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