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Dr. D. Y. PATIL SCHOOL OF ENGINEERING&TECHNOLOGY
Under the guidance of,
A supercharger is an air compressor that increase the
pressure or density of air supplied to an internal
The higher concentration of oxygen provided by a super-
charger is matched with a larger amount of fuel from the
fuel injectors thus boosting the power of the engine.
Principle of working
More fuel + More air = Bigger explosion = Greater horsepower
But we cannot simply pump more fuel into the engine.
The chemically correct mixture – (14 : 1 :: air : fuel) – is
essential for an engine to operate perfectly.
Thus superchargers provides more air by compressing air
above atmospheric pressure , hence providing more fuel into
the charge & would make for a more powerful explosion .
Thus: Increased Power , Torque and Speed is achieved.
BASICLY THREE MAIN TYPES OF THE
1. Roots Types
2. Centrifugal Type
3. Screw Type
It consists two cylindrically shaped lobes in opposite direction in a
Air enters the space in between the rotor lobes at inlet and is carried
around the rotor to discharge port.
A standard engine with the addition of a supercharger
It consists an impeller which is rotates in
The air enters the hub of the impeller
axially and is turned radially by radial
The air leaves the impeller at high speed,
but low pressure.
A diffuser converts the high-speed , low-
pressure air to low-speed , high-pressure air.
It contains a set of worm gears.
Air enters in supercharger through the top rear and
it’s compressed between the rotors.
The male rotor is rotates in clock-wise while female
rotor rotates counter clock-wise and compressed air
Once the air is screwed and compressed the full
length of the rotors it remains in compressed state
between the rotors until the engine demands the
Drives used in supercharger
Advantages of Supercharger
No lag – Consistent power delivery
Generally better throttle response
No Special Procedures or extra maintenance
Easier to install than turbochargers
Disadvantages of Supercharger
Consumes a lot of power from the engine (therefore not very
Increases the strain on the engine
Automotive Mechanics by “William H Crouse”
IC Engine by “M.L.Mathur”