Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-VP) by Fleece Performance®. Fleece has designed coolant bypass kit with a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders. Kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation.
- Designed to deliver trouble-free, consistent performance
- Right for your vehicle and lifestyle
- Made from high-quality materials for ultimate durability
- Manufactured to meet or exceed strict quality requirements
The Cummins engine cooling system was designed to adequately cool a 300-350HP engine. When the horsepower is increased there is an increased demand on the cooling system. The rear cylinders suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the system, especially the rear of the block and possibly blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure.
Fleece Performance Engineering®, Inc. (FPE), a leading truck builder in the automotive aftermarket industry, was set up by Brayden Fleece, Chase Fleece, and Chad Huff in 2007. The company is famous for its innovative products such as TapShifter, Cheetah Turbochargers, and TurboBrake. It's also popular among competition drag racers thanks to custom tuning, transmission upgrades, and engine builds. Today Fleece provides a variety of reliable products as well as develops innovative ones following its principles of high quality and innovation.