Comparison Between Roots, Twin Screw and Centrifugal Supercharger

Increasing the engine horsepower is
not a simple work, yes there are several ways and one of them is forced
induction. In automobile world, there is a device called supercharger which is
specially developed and it can fulfill the requirement of extra horsepower from
the engine. Superchargers are used for the increase in air pressure or density
at inlet valve before sending it to combustion chamber. Adding the extra air
into the cylinder means more oxygen and it can burn more fuel which produces
more horsepower. All the superchargers powered by belt or chain drive from the
engine’s crankshaft. We have already seen the types of it and how they work. Now we will discuss here the comparison between them.

Comparison Between Roots, Twin Screw and Centrifugal Supercharger in Tabular Form:

S.no
1.
Powered
by a belt driven from the engine crankshaft.
It is
also powered by a belt driven from the engine crankshaft.
Centrifugal
supercharger also gets power via belt or chain drive from engine crankshaft.
2.
Working
principle: Positive displacement type.
Positive
displacement type.
Centrifugal type.
3.
Fixed
amount of air per rotation.
Fixed
amount of air per rotation.
Not
fixed amount of air per rotation.
4.
Working:
When two lobes turn in opposite direction, the air suction starts at fill
side and pushes the same quantity of air at discharge side.
Two
same spiral rotors turn in opposite direction and both sides of gear pocket
mesh together. Air flow at the inlet in auxiliary motion transported at
discharge port compress as radially.
Created force rotates the impeller at very high speed and it can suck the
low-pressure air at the inlet and delivers the high-pressure air at the
discharge port.
5.
It
makes much power in low rpm range.
It
also makes much power in low rpm range.
Unlike
root and screw supercharger it is good for high rpm range.
6.
Least
efficient.
More
efficient than the roots supercharger.
Very
much efficient. Almost same as turbocharger.
7.
Less
horsepower, Torque, and boost can be achieved.
More
horsepower, Torque and boost than the root but less than the centrifugal.
Great
horsepower, high torque, and more boost can be achieved.
8.
Parasitic
load: The device absorbs the crankshaft power to run themselves is more.
Less
parasitic load compared to roots type.
Very
less parasitic load is required.
9.
Creates
lot of noise.
Less
noisy than the roots type.
Creates
very less noise.
10.
Creates
lot of heat.
Creates
less heat compared to roots type.
No
Heating issue.
11.
The
construction is bulky and placed upon the top of the engine.
 Construction and design same as the roots
type. This is also bulky.
Small
and compact. Placed in front of the engine.
12.
Installation
is difficult and some modification required in the inlet manifold.
Installation
is difficult but does not require extra modification.
Easy
installation.
13.
Maintenance
is required.
Less
maintenance compared to roots type.
 Less maintenance required.

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