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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