The power-to-weight struggle is a relentless one. Since the dawn of engine swap history, would-be transplanters debated the value of more horsepower at the expense of added weight. But do you ...

Jason Johnson, Paccar’s director of aftermarket, said these engines offer peak torque down to 900 rpm, though the higher ratings only provide it down to 1,000 rpm to protect the drivetrain.

Years ago, I needed to educate myself on drivetrain losses while heading a rulebook committee for a local racing series that wanted to use dyno tests to measure engine output and then convert the ...