Kysor polymer fans have more than 80% of the heavy-duty market. In addition, Kysor fan clutches, while standard only on Peterbilt 387 models and Sterling trucks, they enjoy more than 40% of the market, thanks to fleet spec'ing.
Kysor polymer fans were first produced in 1980, and demand has steadily increased since. Polymer fans are 70% lighter than metal ones and cause less damage and injury if they break. Today, you'll only find metal truck fans standard on some Macks and International medium-duty trucks.
Borg-Warner Automotive Turbo Systems, based in Chicago, includes two former Schwietzer Group divisions, Schwitzer Engine Components and Kysor Cooling Systems. The Schwitzer merger with Borg-Warner has allowed the companies to share technologies such as the constantly variable torque transmission, which uses series of belts in place of the traditional gear set.
Truck and engine manufacturers are looking to their suppliers to put together entire cooling system packages, rather than single components such as fans, fan clutches and radiators. Borg-Warner is working closely with Modine to develop packages for 2002 engines, which will require up to 30% more cooling to meet tougher emissions standards. They may have to go to 34-inch fans, up from current 30-inch and 32-inch sizes. That will mean bigger horsepower draw and more noise.