Raceteam25 Posted June 20, 2016 Report Share Posted June 20, 2016 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? Link to comment Share on other sites More sharing options...
Wayne Walker Posted June 20, 2016 Report Share Posted June 20, 2016 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. Link to comment Share on other sites More sharing options...
CC57 Posted June 21, 2016 Report Share Posted June 21, 2016 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 Link to comment Share on other sites More sharing options...
HiTech Posted June 21, 2016 Report Share Posted June 21, 2016 and only let bout half the fan blades inside the shroud ... Link to comment Share on other sites More sharing options...
WaerRacing00 Posted June 21, 2016 Report Share Posted June 21, 2016 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. Link to comment Share on other sites More sharing options...
Racer26 Posted June 21, 2016 Report Share Posted June 21, 2016 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. Link to comment Share on other sites More sharing options...
CC57 Posted June 22, 2016 Report Share Posted June 22, 2016 Raceteam25, if you can (or want) take a picture of you radiator/fan area and post it here. Link to comment Share on other sites More sharing options...
Raceteam25 Posted June 22, 2016 Author Report Share Posted June 22, 2016 I ordered the GM four bladed fan yesterday. And the way my fan is right now it sits 3/4 of an inch off the radiator. Link to comment Share on other sites More sharing options...
CC57 Posted June 22, 2016 Report Share Posted June 22, 2016 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 Link to comment Share on other sites More sharing options...
HiTech Posted June 23, 2016 Report Share Posted June 23, 2016 being that close a shroud should help . Link to comment Share on other sites More sharing options...
CC57 Posted June 23, 2016 Report Share Posted June 23, 2016 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. Link to comment Share on other sites More sharing options...
HiTech Posted June 23, 2016 Report Share Posted June 23, 2016 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 .. Link to comment Share on other sites More sharing options...
Raceteam25 Posted June 24, 2016 Author Report Share Posted June 24, 2016 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. Link to comment Share on other sites More sharing options...
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