Ford Cobra Motor Modifications - Kenne Bell Blower - Substantial Boost Solution-Tech
Kenne Bell Supercharged Early 4.6 Four-Valve (9 Psi Vs. 12 Psi)
While we decided that 9 psi was about the limit we'd feel safe to run without an intercooler on pump gas, we couldn't just run the motor at one boost level and call it good. After topping the tank with 100-octane race fuel (remember, our tired Cobra motor was running stock compression with cast pistons), we replaced the 3-inch blower pulley with one that measured just 2.75 inches in diameter. The drop in blower pulley size increased the blower speed relative to the motor, which in turn increased the boost pressure. Increasing the boost pressure to just over 12 psi resulted in a sizable jump in power. Despite minor belt slippage with the 2.75-inch blower pulley, we were able to exceed 500 hp with a peak reading of 506 hp at 6,400 rpm. The peak torque jumped by 31 lb-ft, from 433 lb-ft to 464 lb-ft. View Related Article
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