posted September 30, 2001 10:41 AM
Lose the electric fan first off.
Then go to the basics...
1 - Be sure you are not running too much timing, and the motor is jetted correctly.
2 - Be sure the radiator is not plugged full of mud. Use a hose and rinse thru from the backside until the water coming thru is clear. Add this to your maintenance schedule too.
3 - Be sure the cap is the highest point in the cooling system. If it is not you need to be able to bleed the air out at the highest point. You can get a radiator petcock and mount it in the thermostat housing. Or several companies offer really nice purge tanks that mount to the thermostat area (I sell stuff for Art's Radiator).
4 - Slow down the water pump, if you have A/c pulleys they are spinning the pump way too fast.
5 - Never run without a thermostat or restrictor. If you do water flows to fast and cannot transfer heat properly. Also a restrictor helps build pressure in the system and water under pressure has a higher boiling point.
6 - Make sure the water is circulating thru the rad by removing the cap while the system is cold and start engine.
7 - Check your hoses, and be sure you have a spring or reinforcement in the lower hose. A soft or older lower hose can suck shut at higher rpm and restrict the flow.
8 - Insure that about 1/3 of the fans blades are outside the fan shroud. The fan cannot be completely inside or outside the shroud or it will cavitate the air and not move it through the radiator.
9 - try a chemical solution, either water wetter (about $7-10) or a case of **** for you and the crew while you sit inthe pits and it cools off.
There are many other things you can do, some free some not so free. Check your basics then shout if none of this helps.