Running Hot With Smaller WP Pulley?

Hi Evan,

My guess would be you still have air in the system... You cannot move the water too fast...

Since the speed varies with RPM, the current idle speed would be the same as the old minus approximately 80 rpm. For example, if the pulley speed was 800 before at idle, the new speed would be 880 approximately. Cavitation, if it were to occur, would happen at way higher speeds.

You have air still trapped in the system somewhere...

Scott

Scott, I tend to agree. Have the back end of the car in the air now running it to see if I can get more air out. Thanks for the response.

Scott,

Just to let you know it was air in the system, it is actually running cooler now with the smaller WP pulley. Thanks again for the help.

heat exchanger point of view, the more flow , the better ! more fluid velocity means better heat transfer,( water inside "Alpha" value increases ) so more capacity. Ofcourse more pressure drop ( square ! ) , but if the pump can do this, all is better !

The idea that the coolant flow rate of the Pantera's cooling system is too slow (especially at low rpm) is not new. John Taphorn has been advancing this for at least a decade. I've seen very old articles in Pantera International News also advancing this idea. I've held this opinion since long before I purchased mine.

Odoardo Govoni raced a group 4 Pantera (chassis 2873) for 11 seasons (1974 to 1984). He won 3 Italian championships and one European championship. He claimed Bertocchi made one improvement to his group 4 Pantera's cooling system, i.e. installation of a smaller water pump pulley. This is where Scott and I got the idea for this mod. That pulley is a mod that the Pantera has needed for 40 years, and I applaud Scott for bringing it to market. I am not exaggerating when I say every Pantera needs this pulley.

If you own the De Tomaso Racing Book by Olczyk you can find a short 2004 interview with Govoni on page 102 where the pulley is mentioned.

Air collecting in the radiator is another problem, the only way to resolve this is to install a header tank and plumb an "air-bleed" from the radiator to the header tank.