• Piston blow-by and the resulting crankcase/sump pressure if not vented off adequately is the most common cause of turbocharger oil leakage.
• The most common contaminants found in the oil are 'free floating' carbon deposits, fuel and the by-products of combustion.
• A typical diesel turbocharger with rotor speeds in excess of 200,000 R. P.M. will have a blade speed on the compressor wheel of 850 miles per hour.
• Many operators assume, quite wrongly, that if they run an engine with dirty or contaminated oil, the oil filter will remove any foreign matter before it reaches the engine and more importantly the turbocharger.
• Oil delay of a mere four seconds will start to cause journal and thrust bearing wear. Delay of just eight seconds can cause irreparable damage. This damage will not necessarily manifest itself immediately, the final failure may occur after several days.
• By integrating a turbocharger with a downsized engine, automakers can improve fuel efficiency by as much as 40 percent in diesel applications and 20 percent in gas applications as compared to a larger naturally-aspirated gas engine with similar output performance.
• The turbocharger rotor will accelerate from 20,000 revs per minute to over 150,000 revs per minute in less than one second.
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