performance · FF-0287

How close was Steve Coppock's horsepower prediction, and why did he stop at 300?

Steve used engine software to choose the parts, and its prediction was right around 295 horsepower; the engine made 290 as first set up. A smaller blower pulley, about 10 percent more overdrive, brought it to 300 horsepower at 5,300 rpm. He stopped there because more boost could have been tried but there is a point of diminishing returns, and he felt they had reached it.

Expert

Steve Coppock

Evidence

measured

Component

prediction and result

Applicable scope

Steve Coppock's supercharged 8BA-style Ford Flathead V8, about 290 cubic inches, on the engine dyno at Klein Engines