Faster isn’t always better, at least when it comes to over-the-road truck engines. Manufacturers said more fleets are requesting downsped engines that run at about 1,100 rpm at highway speeds, ...

Gearing has always been important for all types of trucks, but it's even more important nowadays for those powered by EPA '07-spec diesels. Builders have extensively re-engineered them to meet the new ...

The Detroit Diesel DD13 is a 12.8L inline-six engine designed to put out 470 hp at 1,800 rpm, along with a steady 1,650 lb-ft of torque that starts at just 1,100 rpm. This level of performance from an ...