1999 Ford F-150 Lightning Kenne Bell Blower Swap
Eaton vs Autorotor (Max Boost vs. Max Boost)
Testing on the Lightning took a number of days and several long nights. The result was a wealth of information. During the testing, we swapped blower and crank pulleys (provided by Johnny Lightning) and tested just about every conceivable pulley and boost combination for both blowers. The Eaton was run with a combination of two different supercharger pulleys and four different crank pulleys. After cranking up the boost to the max with the smallest blower pulley (2.75 inches) and the largest crank pulley (9.00 inches), we decided to further improve the power output of the motor equipped with the Eaton supercharger. We installed a prototype single-blade throttle body from Accufab and a cone filter on the 90mm MAF to eliminate some of the inlet restriction. So equipped, the Eaton blower could only muster 15 psi of boost and produced 415 horsepower at the wheels. There was actually very little power gain by installing the smaller 2.75-inch blower pulley in place of the 3.00-inch pulley. All signs indicated that the Eaton M112 blower was about done at this power level. Installing the Autorotor with an identical set up (both pulleys and air inlet) resulted in a dramatic increase in power. With the same pulley ratios (2.75x9.0), the peak power jumped to 511 hp. Imagine that--over 500 hp at the wheels, and not just at some peak number. Equipped with the Autorotor, the Lightning motor exceeded 500 wheel horsepower for a full 1200 rpm. View Related Article
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