Increase Horsepower and Torque
The Supercharged Engine
Boost - Charge - Power
are the most cost-effective way to increase engine power, adding
an average of 46% horsepower and 31% more torque. Easy installation
and maintenance make superchargers the most cost-effective way to
increase performance power. Add excitement to your driving experience…
What is a Supercharger?
A supercharger is a pump used to force more air into the combustion
chamber of an engine. It draws air in, squeezes the air into a smaller
space and discharges it into the intake manifold. It is combined
with fuel to form an explosion (charge) that is ignited by the spark
plug. The force of the charge drives the piston down creating motion
that is eventually transferred to the wheels. Superchargers spin
at speeds as high as 50,000 to 65,000 rotations per minute. A supercharged
engine can be powered mechanically by belt, gear, or chain-drive
from the engine's crankshaft. Superchargers can also be driven by
a gas turbine. A turbine-driven supercharger is powered by pressure
of exhaust gases forcing air into the engine.
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Why use Superchargers in High Altitudes?
Engine performance deteriorates in high-altitudes due to air’s
low density. Internal combustion engines of airplanes use superchargers
due to high altitudes because they deliver higher-pressure air to
engines for optimal operating. The boost from a supercharger places
about 50 percent more air into the engine.
use Positive Displacement Superchargers?
A positive displacement pump delivers a constant level of boost,
dividing air into parcels, mechanically moving air into engine bit
by bit. They absorb as much as a third of crankshaft power Positive
displacement pumps use either external or internal compression.
Why Use Dynamic Compressor Superchargers?
Dynamic Compressor Superchargers deliver increasing boost with increasing
engine speed. They rely on accelerating the air to high speed and
exchanging that velocity for pressure by slowing it down. Comprex
superchargers do not fit neatly into either dynamic or positive
displacement categories; they use the exhaust gas to directly compress
the incoming charge.
Keeping the air that enters the engine cool is an important part
of the design of both superchargers and turbochargers. an intercooler
between the pump and the engine to reduce the temperature of the
air. As compressed air increases in temperature it expands less
and loses density causing less power when ignited by the spark plug.
Superchargers cool compressed air before it enters the intake manifold.
The “intercooler” is a small radiator responsible for
this cooling process. Intercoolers come in two basic designs: air-to-air
intercoolers and air-to-water intercoolers. Cooler air or water
is 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.
About Internal Compression…
Internal compression air is compressed within the supercharger,
delivered to engine with little backflow. This is more efficient
than backflow compression and allows higher efficiency to be achieved.
Internal compression devices usually use a fixed internal compression
ratio. When the boost pressure is equal to the compression pressure
of the supercharger, the backflow is zero. If the boost pressure
exceeds that compression pressure, backflow can still occur as in
a roots blower. Internal compression blowers must be matched to
the expected boost pressure in order to achieve the higher efficiency
What are the Advantages of Supercharging?
External compression transfers air at ambient pressure into engine.
If the engine is running under boost conditions, the pressure in
the intake manifold is higher than that coming from the supercharger.
That causes a back flow from the engine into the supercharger until
the two reach equilibrium. It is the back flow that actually compresses
the incoming gas. This is a highly inefficient process and the main
factor in the lack of efficiency of roots superchargers when used
at high boost levels. The lower the boost level the smaller is this
loss and roots blowers are very efficient at moving air at low pressure
differentials, which is what they were first invented for Roots
and Twin-Screw Superchargers provide more power at lower RPM. Centrifugal
Superchargers provide more power at higher RPM
An inexpensive way to increase horsepower.
Power increases of 50 to 100 percent with no “lag”
Better gas mileage than engines of equal power
Bolted to top or side of engine for easier access
A Strong Engine & Transmission
High-Octane Premium Gas
Supercharged Engine Effects…
Drivetrain Warranty - may be voided
Life Expectancy of Engine - may be reduced
Additional Torque - may be a problem
Undersize Components - creates excessive heat
Boost: Boost is the ratio of revolutions before
and with air compression by a blower
Charge: a charge is a packet of potential energy
that can be turned into useful kinetic energy through a chemical
reaction known as combustion.
Lag: Lag refers to the time it takes an engine
to respond when a gas pedal is depressed
Positive Displacement Superchargers
And Dynamic Compressor Superchargers
Multi stage axial flow