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Author Topic:   ANOTHER OVERHEATING PROBLEM
acerace
Dirt Roller

Total posts: 6
posted April 12, 2004 06:27 PM  
A buddy of mine has a sportsman. Last year he had overheating problems. This year I built his GM 350. Still has same problem. As it stands now he hae 4 core radiator, stock water pump, 160 thermostat, and twin electic fans. Overheats only at 3500-7000 rpm's.
ANY IDEAS?????

waltonjr1
Dirt Forum Champ
Total posts: 516
posted April 12, 2004 06:38 PM  
To start get rid of the t- stat, if rules require stock pump, use a 5/8 restrictor, get a 4 blade solid fan and make sure your fan shroud is in good shape with your fan half in in and half out. You will probally get alot of different suggestions, the fact is there is a few combos that will work, you just gotta find the best one for you.


speedyd1
Dirt Maniac

Total posts: 170
posted April 12, 2004 06:41 PM  
i would try a set of underdrive pullies to try and slow down the flow. check the jetting on your carb - fatten it up a little will help some.

waltonjr1
Dirt Forum Champ
Total posts: 516
posted April 12, 2004 07:17 PM  
Underdrive pullys are to slow the pump down b/c a stock pump will cavitate at high rpm's.You want as much flow as your pump can put out, thats why 1 to one pullys are recommended if your using a high flow pump.With a stock pump you need the reduction pullys.


Driver67R
Dirt Roller

Total posts: 21
posted April 13, 2004 07:34 AM  
it might be the electric fan giving you the problems we had the same problems with an emod 2 years ago got rid of the electric fan and it hasn't overheated since.

juliaferrell
Dirt Freak

Total posts: 370
posted April 13, 2004 10:19 AM  
Throw the electric fans in the junk!

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 13, 2004 10:37 AM  
junk the t stat and the electric fans and get a good steep pitch solid 4 blade fan with a good shroud setup and good belts. Make sure the radiator is in good shape clean inside and out and fins are good. Also check jetting and make sure hes not running on the lean side or has a intake leak somewhere.

akadirtracer7
Dirt Freak

Total posts: 217
posted April 13, 2004 12:31 PM  
Get rid of the elec fans.good shrouds both sides and clean the radiator out every week I mean dirt from inbetween the fins.

redneck racing
Dirt Forum Champ
Total posts: 860
posted April 17, 2004 04:29 PM  
Get rid of the t-stat and use the restrictors also try using the water wetter or the hyper-lube. I personally use the hyper-lube and have had no overheating problems since. Eddie

acerace
Dirt Roller

Total posts: 6
posted April 18, 2004 05:59 PM  
Thanks for the replies. I had an idea the electric fans where part of the problem. I took the advice and ditched the electric and got a good four blade with shroud and it helped. Now just have to wait for August!

Wind Walker
Dirt Full Roller

Total posts: 37
posted April 20, 2004 09:36 AM  
Getting rid of the T-Stat & the electric fans were good responses, as well as changing the pullys. If your rules allow, you might also want to change over to an aluminum pump as well, try different restrictors (1/2 5/8) also, until you find which benefits your situation. If you're using anti-freeze (some tracks don't allow it anyway), remove it from the radiator & replace it with clean water. DO NOT RUN ANTI-FREEZE!

Have A Great Day,
Wind Walker

    

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