S UPERCHARGER I
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JET SKI SUPERCHARGER How it Works

jetski Unlike turbochargers, which use the exhaust gases created by combustion to power the compressor,Jet Ski superchargers draw their power directly from the crankshaft.

jetski 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.

jetski 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).

jetski 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.

jetskiAs 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.

jetski 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 process.

jetski 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.

jetski 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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