A turbocharger, or turbo from the Greek "τύρβη" (mixing/spinning) is a forced induction device used to allow more power to be produced for an
engine of a given size. A turbocharged engine can be more powerful and
efficient than a naturally
aspirated engine because
the turbine forces more air, and proportionately more fuel, into the combustion
chamber than atmospheric pressure alone.
a
turbocharger is driven by the engine's exhaust gas turbine. Compared to a mechanically-driven supercharger,
turbochargers tend to be more efficient but less responsive.
The turbocharger increases the density of the air resulting
in a denser mixture. The denser mixture raises the peak cylinder pressure,
therefore increasing the probability of knock. As the AFR is leaned out, the
temperature of the burning gases increases, which also increases the
probability of knock.
This is why it is imperative to run richer AFR on a
boosted engine at full load. Doing so will reduce the likelihood of knock, and
will also keep temperatures under control. The rpm of a turbocharger of
Waukesha VHP5904 is 20,000 to 2,000,00 depends on load.
There are actually three ways to reduce the probability of
knock at full load on a turbocharged engine: reduce boost, adjust the AFR to
richer mixture, and retard ignition timing. These three parameters need to be
optimized together to yield the highest reliable power.
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