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Raceteam25

Over heating

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I am running a sport mod. When I run a 8 lap heat race the engine wil get up to 220. And when I run the feature it will stay at 230 until a caution or the race is over and it will get up to 245. I am running a six blade fan and have a 1" restrictor in it with a triple pass radiator. What do you think the problem might be?

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Go to a four blade, steel, high pitch fan. Make sure to wash the radiator from the engine side. Be careful using compressed air because the pressure can bend the fins. Also needs a good shroud around the fan.

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Agree with Wayne on ditching the 6 blade and go with the 4-blade.

 

I believe the part #s are GM # is 405442 or AC Delco 15-80752.

 

Hope this helps

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If ur running a v belt make sure your belt is not slipping on pulley...look inside the pulley if you can see thats its shinny its slipping.

Also make sure your fan is close to radiator or if you have shroud it half in and half out.

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Do not run a restrictor with the triple pass. Water spends to much time in the radiator with the restriction. Get the four blade GM fan, it solves lots of overheat problems.

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Raceteam25, if you can (or want) take a picture of you radiator/fan area and post it here.

Edited by CC57

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Definitely looks close enough

 

Based on when you're experiencing the problem sounds (obviously enough) like you're not getting enough air "pulled" through the radiator

 

The 4 blade is a good first step. And the shroud would probably seal the deal.

 

My opinion anyway

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Also, how many laps/races do you have on the radiator between cleaning it?

 

Have you taken the radiator out, dropped it, fins facing the ground, from a couple of inches off the ground. Knocks the dirt out from between the cooling fins.

 

Or soak it in a "tub" or something big enough to house the radiator. Softens and loosens the dirt between the fins. Then take a hose and clean it out.

 

Sorry if you already knew of these steps.

 

And I don't know if this would contribute to the specific issue you're experiencing, but it wouldn't hurt to perform either of the above.

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a question are you pushing water out ... how is your upper hose located curved upwords or is it level as can be .. rainbow over will hold an air pocket every time . and I found this a couple of weeks ago .one car was showing hot .so checked the temps around the radiator hoses and other areas .and found the temp guage is ten off to the hot ..

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Thank you for helping me on this. I am going to put a new radiator in and a four bladed fan on with a shroud on it and try it out this weekend. Thanks again.

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