Evans Cooling Systems, Inc. has expanded their product line with the release of a high flow pump and pulley combinations for the GM LS1/LS6. Evans EP30913 Pump and Large Pulley (E3919) is now available for demanding engine RPM applications. The pump has been designed to increase flow 20% more than the OEM style replacement pumps, and maintains equal flow to both cylinder banks at any engine RPM. Evans improved design includes an engineered impeller, a billet pulley hub, heavy duty roller bearing and ceramic shaft seal. The 8 vane scrolled impeller design reduces parasitic horsepower loss at high RPM. Evans pumps are machined for correct clearance to accommodate Evans Small LS1 pulley, Evans Large LS1 pulley is a direct bolt on to an Evans pump. Evans has also applied this technology to the GEN III truck pump. (EP30914)

Evans Small pulley (E3910) is designed to work with the OEM crank pulley. This Pulley design maximizes cooling capacity by increasing coolant flow on factory applications more effectively then stock pulley combinations. Evans Large pulley (E3915) increases performance when using an under-drive crank pulley. Evans Small and Large pulleys are 8-rib compatible. Optimal Pump RPM range is 2500 - 6500. Pump flow (gpm) is maximized at 5500 pump RPM. For sustained high RPM applications our suggested combination is Evans Large Pulley and a 25% under-drive crank pulley. The pulleys are available as billet aluminum or anodized hard coat.Refer to LS1 Pump RPM vs. engine RPM to compare pulley drive ratios.

Evans also recommends the use of their modified thermostats, available in 160ºF and 180ºF temperature settings. The modification increases the flow up to 55% more coolant than other after market thermostats and maximizing the cooling advantage of the Evans EP30913 Pump. Evans LS1 Thermostats can also be used on all OEM LS1 pumps.

Pump pulley and thermostat may be purchased separately or may be assembled for your specific application.

Corrosion-free ceramic coating is available on the pump and thermostat housing for show quality. Power coating in custom colors is also available, call for quote.

Right click to Download our latest LS1 / LS6 Product brochure, left click to view in your Adobe Reader. This PDF file is the exact printed flyer we distribute and is complete with product descriptions and pricing.

Evans and Darton Sleeves Darton Sleeves Requires NPG+ or NPGR for use with its MID LS1 sleeve conversions
The Darton kit effectively converts the block to a wet sleeve configuration as used on diesel engines. One cannot expect the original cooling system to effectively cool an engine producing two or more times the power of the original engine, along with a modified cylinder arrangement. We require “Evans NPG+™ coolant” be used as well as Evans LS-1 reworked water pump utilizing a relocated thermostat. High output applications may also require a larger radiator and coolant fan. Evans coolant is recommended because of the potential for hot spots and cavitation around wet style sleeves. We realize that most engines built will produce well in access of the stock rated horsepower making cooling system enhancements a must.
The above taken from Darton Sleeves Technical papers. For more information on Darton, please visit http://www.darton-international.com