During the last 20 years, progressively smaller diesel engines have been turbocharged, so that units of 50-60 hp are produced today. Spark-ignition engines remain normally aspirated for most applications, although this picture may change.
Progress followed the adoption of radial flow turbines using lost-wax cast rotors. Other developments included:raising component efficiencies; dealing with bearing and seal design problems, and with vane vibration; and in devising manufacturing methods for quantities approaching 3000 weekly, in mixed and rapidly changing batch sizes.
Various control systems are available to match the turbocharger to the demands of variable speed engines.
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