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Author Topic:   how to cool engine down w/ stock water pump
Dirt Maniac

Total posts: 119
posted September 08, 2005 05:43 PM  
Rules in my division say stock cast iron water pump, so I can't use the Stewart pumps.

I understand if you're allowed to use the Stewarts Stage 3 pump, that reduction pulleys and water restrictors don't make sense, but...

if I have to use a stock pump, would some combination of reduction pulleys and water restrictors be the best way to cool down?

I've been using distilled water with reduction pulleys and a 160 thermostat, but running a little hot by the end of the feature...around 230. Also have a 6 blade aluminum fan located 1/2 in the shroud.

Any suggestions appreciated!

[This message has been edited by rogracer2 (edited September 08, 2005).]

Dirt Forum Champ
Total posts: 5390
posted September 08, 2005 08:05 PM  
The reduction pulleys will make you run about 10-15 degrees hotter than running straight 1-1 pulleys. If you are running to hot, get rid of the reduction pulleys. Also, what kind of radiator do you have? If you don't have an aluminum (sp) one, get one.

Dirt Maniac

Total posts: 119
posted September 09, 2005 02:15 PM  
I do not have an aluminum radiator.

I've been thinking about the one to one pulley rule, and I want to make sure I know what everyone is saying. One to one means the pulley on the crank and water pump are the same size, right?

What is a good size for them to be - 5 inches, 7, 8 inch diamter? Is there only one standard size? A reduction pulley means the pulley is larger than normal (to make the pump turn slower)?

Just wanting to make sure I'm clear on everything!

Thanks for everyones input here!

Dirt Forum Champ
Total posts: 5390
posted September 09, 2005 03:08 PM  
Looking at my car, it looks like the water pump pulley is around 7 inches diameter, and the crank pulley is around 5 1/2 inches. Should I be trying to get a smaller pump pulley, or a larger crank pulley? Does it matter?

Dirt Forum Champ
Total posts: 5390
posted September 09, 2005 05:48 PM  
Are 1-1 pulleys larger or smaller than reduction pulleys?

Dirt Maniac

Total posts: 188
posted September 09, 2005 11:27 PM  
The crank pulley will be smaller than stock and the water pump pulley will be a little larger than stock.

Dirt Freak

Total posts: 402
posted September 11, 2005 08:30 PM  
I bought a serp setup this year and the guy at the shop talked me into the 35% reduction pulleys. He said that everybody that bought the 15% all came back and got the 35%. So I wnet with the 35% and ran 230+ for the first 3 nights while changing everything from the restrictor to the fan and cutting the grille out on the nose. Put a 15% crank pulley on and it stayed at 210. After talking to him later I found out that just about all of his other customers ran latemodels that were turning close to 8000, not 6000 like mine was. I would gladly run 1 to 1 fi they made a larger crank pulley for the KRC but I can live with it. If your not running really high RPM then you dont need the added reduction.
By the way mine is a 20$ carquest reman pump in a 400horse street stock.

Dirt Freak

Total posts: 374
posted September 12, 2005 04:54 AM  
The stewart cast iron water pumps are in a stock casting. So you can run one. These guys are right. 1-1, no restrictor or a guted T stat, 17" 6 blade fan or a big 4 blade and a good close fitting shroud. I had a wreck and changed my fan from a 17" to a 15" with a tight fitting shroud and water temp went up 25. I bought a new 17" and hammered the old shroud out and put it back on and water temp went right back down.

Dirt Roller

Total posts: 5
posted September 19, 2005 05:50 PM  
Have you tried Water Wetter?

Dirt Newbie

Total posts: 4
posted September 22, 2005 11:56 AM  
you should put in an air box to direct the air right into to rad and no holes because you dont want to give the air a place to get past . an air box is just metal or plastic board to flow the air hitting the grill into the rad .

Dirt Maniac

Total posts: 123
posted September 26, 2005 10:20 AM  
Make sure you run a shroud and seal the shroud to your radiator. Its the same pricipal with the airbox in front of the radiator. Seal the airbox and shroud to the radiator to make sure the air passes THROUGH that raditor, not around it. Hi-temp aluminum tape works great, duct-tape will melt on the radiator housing.

Dirt Forum Racer

Total posts: 81
posted September 28, 2005 08:20 PM  
a cap full of fabric softener will do the same thing as watter wetter, and it's cheaper. Seriously, It works

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