They always keep their machines so spotless. It looks like it just rolled off the lot ! . With many municipalities going to the Loader-attach blowers, its nice to see these larger truck style blowers still in use.
Neat that the driver let you see the engine. That engine is a 6-71 exclusively for driving the blower impeller and augers, while the prime mover has a 4-53 (under the cab) for propulsion forward. You can tell the rear engine is a -71 by the racetrack-shaped airbox access covers on the exhaust side. Appears to be blower-scavenged only, no turbo. A turbocharger is still used on some Detroit two-strokes to improve the efficiency of air scavenging under power, and this provides colder and cleaner air for combustion which enables the making of more power, although turbocharging is still not as efficient in terms of power boost as it is on a 4-stroke engine. The Detroit two-stroke diesels are perfect for driving rotating machinery like a snowblower, where the objective is not maximum torque but high RPMs. As I wrote on another thread, it is the RPMs that get the work done, and torque is just a necessary evil to prevent stalling under load, but excessive torque tends to be what breaks things (in the drivetrain).
