Technical reasons for running em hard to clean out combustion chambers?

Consider this: According to the chart below w115 220D's develop a piddling 32hp at 2000rpm yet produce 60hp at 3500rpm. Obviously complete combustion is directly related to engine output efficiency which itself is related to torque and HP SAE. Hence operating at bottom end performance level of the power band, lugging the engine around town will eventually foul pistons, valves and pre-comb chambers through incomplete combustion. Could be stressing internal engine parts too as it struggles to maintain speed while developing less then 50% of its rated horsepower at/near 40% output efficiency.



Politically incorrect "Italian Tune-Ups? "

My first on the books summer job was helping out at a Fiat dealership circa 1971. I made $2.25 per hour or roughly $78 per week after taxes, saved all Summer to buy my first vehicle - 5 yr old Triumph Spitfire mk2 that somebody traded in. The dealership let me have it for $650. Brand new cars in those days sold for about $29-3200 or so.

Anyhow the 124 Fiat Spyder was built like a baby Ferrari, souped up stock w/ twincam engine, 5-spd and Webers. And I swear to god have seen this with my own eyes - factory trained Italian mechanics would take em out and rev the hell out of em as part of the tune-up process. Could hear the engines racing more then a block from the dealership on return from test drives. And who can blame em? Look at the race cars Italians build. You will find Lomborgini police cars at Italy today. And they've gotta have em to catch Ferraris and Bugattis. These guys have earned a reputation as speed demons that goes back nearly a century. So why should naming high-speed tuneups after em be "politically incorrect" or construed as offensive? There really is no better phrase then Italian tune-up to describe this tried and true method of thrashing the bugs out of an engine.