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Author Topic:   Engine Cooling Problems
Dirt Full Roller

Total posts: 39
posted March 21, 2000 06:59 AM
What's everybody's method of keeping cool? I was having problems of throwing belts, so I got a smaller crank pulley to slow things down. All I could find was a 50% reduction pulley which has eliminated the problem, but now I think the the water pump is turning too slow. It seems to be able to keep the engine cool initially, but if for any reason it gets hot, I don't think it will be able to cool down again. I believe it's either a water flow or air flow problem. I'm thinking of trying to find a smaller water pump pulley to speed it up to counteract the slow crank speed. Maybe one of those aluminum, high flow water pumps is also needed.

Any suggestions? I'm running out of time here!


Dirt Administrator

Total posts: 3279
posted March 21, 2000 09:20 AM UIN: 16262997
You running gas? If so, you need a 1 to 1 ratio on the pulleys. This will speed the fan up to cool the engine. Make sure you have a shroud that cuts the fan blades in half when you have everything together. Most guys start with a 1/2" or 5/8" restricter to thermostat housing to help keep the block pressurized and keep the flow of the water a little bit slower. Also, make sure your timing is correct, if you are leaning the motor out, it will overheat quickly. Same with the jets (check plugs). Just a few things we have learned. Hope this helps.

Dirt Freak

Total posts: 239
posted March 21, 2000 09:00 PM UIN: 25419780
I agree with jammin..I an over heating problem once.. rejeted carb and redid the pullys and now no more over heating

thanx john

X-1R Guy
Dirt Maniac

Total posts: 101
posted March 22, 2000 03:25 PM
Take a good look at your belts and hoses. If I had a nickle for every time I've seen a collapsed upper rad. hose. Those hoses with the wire inside are junk! I will only use belts and hoses from NAPA. These are the finest belts and hoses I have ever seen and used. Get the ones with the yellow stripe. Also make sure you take a light and shine it through your rad. If you cant see light shining through,get it replaced.I have a latemodel and remove my rad. every week to clean and straighten fins. The proper way to clean dirt from a rad. (this may sound weird but its true)is to get a board a little larger than the rad. itself, and holding the rad. about 6 to 8 inches above the board(make sure flat with connections facing towards you)drop the rad onto the board.This will dislodge any dirt and debris from the rad. fins. Repeat this action until no more debris will dislodge. Also take a look at the new 4 blade GM fan. Poske's has them available in their catalog. These are the same fans most of the Hav-A-Tampa guys run on gas with no shrouds and the frontend blocked off. These fans really draw some air. The trick is to get the fan from 1/2 to 3/4 of an inch away from the rad. I hope some of this info. has helped. Good luck!

[This message has been edited by X-1R Guy (edited 03-22-2000).]

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