SKI SUPERCHARGER How it Works
Unlike turbochargers, which use the exhaust gases created by combustion
to power the compressor,Jet Ski superchargers draw their power
directly from the crankshaft.
Most are driven by an accessory belt or gearing connected to a
drive gear. The drive gear, in turn, rotates the compressor gear.
The rotor of the compressor can come in various designs, but its
job is to draw air in, squeeze the air into a smaller space and
discharge it into the intake manifold.
To pressurize the air, a Jet Ski supercharger must spin rapidly
-- more rapidly than the engine itself. Making the drive gear
larger than the compressor gear causes the compressor to spin
faster. Jet Ski Superchargers can spin at speeds as high as 50,000
to 65,000 rotations per minute (RPM).
A compressor spinning at 50,000 RPM translates to a boost of about
six to nine pounds per square inch (psi). That's six to nine additional
psi over the atmospheric pressure at a particular elevation. Atmospheric
pressure at sea level is 14.7 psi, so a typical boost from a supercharger
places about 50 percent more air into the Jet Ski engine.
the air is compressed, it gets hotter, which means that it loses
its density and can not expand as much during the explosion. This
means that it can't create as much power when it's ignited by
the spark plug.
For a Jet Ski supercharger to work at peak efficiency, the compressed
air exiting the discharge unit must be cooled before it enters
the intake manifold. The intercooler is responsible for this cooling
Intercoolers come in two basic designs: air-to-air intercoolers
and air-to-water intercoolers. Both work just like a radiator,
with cooler air or water sent through a system of pipes or tubes.
As the hot air exiting the supercharger encounters the cooler
pipes, it also cools down. The reduction in air temperature increases
the density of the air, which makes for a denser charge entering
the combustion chamber.
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