Visit The Dirt Forum for More Information

Author Topic:   Cooling HELP
Dirt Full Roller

Total posts: 36
posted May 10, 2005 12:50 PM  
I was wondering what kind of radiator every one runs and which is the best rad out there to run. I have ran afco's and griffins but cant get any of them to cool the car down. If any body has any tricks for cooling the car plz post them.

Dirt Maniac

Total posts: 149
posted May 10, 2005 01:06 PM  
go to the speedway website and look at this part number ,#91015920, it honeslt killed about 20 or 25 degrees for us

Dirt Maniac

Total posts: 136
posted May 10, 2005 02:09 PM  
Mine is a worn out old Griffin. We had tons of heating problems last year.

A few things we did that made a big difference.

1. built a new shroud.
2. change from the racing 6 blade fan to an old truck 4 blade steel fan.

These two things made the biggest difference.

A few other things that effected our temps.

1. changed from running a mix of coolant and tap water to running all distilled water.
2. bought a new radiator cap.
3. worked on the timing of the car a little.

Dirt Full Roller

Total posts: 36
posted May 10, 2005 02:29 PM  
i have a small 5 blade fan should i look into changing this and i also run no thermastate or nothing it is just ran wide open should i look into running a reducer

Dirt Maniac

Total posts: 136
posted May 10, 2005 02:52 PM  
We ran with two different size restrictors and without a thermostat and didn't notice a significant difference either way.

Dirt Roller

Total posts: 25
posted May 10, 2005 04:05 PM  
1. Don't have any open holes in your grille or nose screened or not.
2. Screen / hardware cloth the bottom of your car from the front bumper to where the radiator mount is. Make sure no mud can get directly to you radiator without passing through that screen.
3. Run the coolant additive and a restrictor.
4.Most important. Have your shroud as sealed around the radiator as much as poss. and make sure the fan sits inside the shroud at least halfway.

If you have mud in the radiator soak it in a 55 gal drum for a few days then spray it from the back with a hose.

The four blade fan is not bad but yours should work as long as it is not a flex fan

Dirt Full Roller

Total posts: 36
posted May 10, 2005 04:23 PM  
We have a very good shroud but we have holes in are nose cone so we should run distilled water with water wetter and what size restrictor do you think we should run

redneck racing
Dirt Forum Champ
Total posts: 860
posted May 10, 2005 11:53 PM  
Same here 5e, I took a thermostat and gutted it out and use it as a restricter was thimking about getting restricters but the t-stat worked fine. Eddie

Dirt Freak

Total posts: 428
posted May 11, 2005 02:49 AM  
a proper shroud is very important, also go to a 1-1 pulley arrangement, and a good solid blade fan 15" is ok 18"is better. and I run a robertshaw high flow t stat from stewart components and their cast iron water pump cannot be beat! any alum rad in good shape should work fine

Dirt Maniac

Total posts: 195
posted May 11, 2005 02:13 PM  
Another very very important item to ensure is that the rad cap is the high point in the system. If your rad is mounted low and the cap is below the top of the cylinder head you will never keep that thing cool.

Dirt Newbie

Total posts: 2
posted May 12, 2005 11:47 AM  
Make sure the springs in your hoses are keeping the hose open.
Fan should be half in and half out on the shroud.
Run the intake divider as your water restrictor.

Shawn Kammerud

Dirt Full Roller

Total posts: 56
posted May 12, 2005 11:56 AM  
Call Ron Davis Racing Rads there number is 623 877 5000 ex 5 talk to Doug he is a ball of knowledge he will give you plenty of does and donts that will keep your car cooler than any backyard knowledge on here will ever lead you.

Dirt Forum Champ
Total posts: 5390
posted May 12, 2005 05:00 PM  
Do the following:
1) Build a good shroud that will not allow air to bypass the fan and have half of the fan blade sticking behind the opening of the shroud.
2) run a thermostat - 180 degree - stock will work. you have to slow down the coolant enough to allow it to both absorb heat from the engine and to allow it to dissapate via the radiator!
3) use a 22 to 25 lb pressure cap!
4) do not make the mistake of over filling the radiator. Leave at least 1 inch of clearance from the top when filling it to allow for expansion!
5) use distilled water and put a bottle of water wetter in to help lubricate your water pump.
6) Every week - soak you radiator with water and let is sit wet to soften up the dirt - flush out the fins really well until all water is clear. I use compressed air to blow the water and dirt out afterwards.
6) During hot laps if mud is allowed to reach your radiator try covering up the openings with tape or what ever to keep it clean until your heat race.
7) If your car has gotten really hot you might have expanded the tubes in the radiator and they could be pinched shut or restricted from the swelling. In which case you would have to replace it.
8) As far as pulleys are concerned I have run 1 to 1 and am now running a 30 percent reduction pulley on the pump with a stock pump. I ran at one track here a few weeks ago and ran 7400 rpm and never got over 200 degrees so it can be done!
I think if you do all of the above you should eliminate any of your over heating problems! Make sure your timing is set correctly too! Good luck!

Dirt Full Roller

Total posts: 36
posted May 13, 2005 02:10 PM  
Would be making a plat in between the motor and the rad help restrict the heat coming off the motor.

Dirt Maniac

Total posts: 102
posted May 13, 2005 05:24 PM  
If your car is running the fan will pull the air twards the motor not the other way around. A good shroud is the key here and keeping the radiator flushed out between the fins! Ya might have to have some holes in the nose peice as well. If ya do what I have mentioned above you will not or should not have any problems! Good luck! It is the little things that will get ya frustrated! Don't make it any more complicated! Good luck!

02 Blewbyu
Dirt Full Roller

Total posts: 48
posted May 15, 2005 12:21 AM  
Check your carb jetting especially if you have to use a restrictor plate. I fried a new motor today in hot laps because the restrictor plate caused a lean condition.

Stomp and steer racing


Back to the Archives