Increasing the engine horsepower is not a simple work, yes there are several ways and one of them is forced induction. In the automobile world, there is a device called a supercharger which is specially developed and can fulfill the requirement of extra horsepower from the engine. Superchargers are used for the increase in air pressure or density at the inlet valve before sending it to the 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 are powered by a 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 Roots, Twin Screw and Centrifugal Supercharger.
Comparison Between Roots, Twin Screw, and Centrifugal Supercharger in Tabular Form:
| S.no | Roots Supercharger | Twin-Screw supercharger | Centrifugal Supercharger |
| 1. | Powered by a belt driven from the engine crankshaft. | It is also powered by a belt driven from the engine crankshaft. | Not a fixed amount of air per rotation. |
| 2. | Working principle: Positive displacement type. | Positive displacement type. | Centrifugal type. |
| 3. | Fixed amount of air per rotation. | Fixed amount of air per rotation. | Working: When two lobes turn in opposite directions, the air suction starts at fill side and pushes the same quantity of air at discharge side. |
| 4. | It makes much power in the low rpm range. | Created force rotates the impeller at a very high speed and it can suck the low-pressure air at the inlet and delivers the high pressure air at the discharge port. | 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 also makes much power in the low rpm range. | It also makes much power in the low rpm range. | Unlike root and screw supercharger it is good for high rpm range. |
| 6. | Least efficient. | More efficient than the roots supercharger. | More horsepower, Torque, and boost than the root but less than the centrifugal. |
| 7. | Less horsepower, Torque, and boost can be achieved. | Very little parasitic load is required. | 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. | Creates a lot of noise. |
| 9. | Creates very little noise. | Less noisy than the roots type. | Creates a lot of heat. |
| 10. | Creates less heat compared to the roots type. | The construction is bulky and placed on the top of the engine. | No Heating issue. |
| 11. | Installation is difficult and some modification is required in the inlet manifold. | Construction and design same as the roots type. This is also bulky. | Small and compact. Placed in front of the engine. |
| 12. | Created force rotates the impeller at a very high speed and it can suck the low-pressure air at the inlet and delivers the high-pressure air at the discharge port. | Installation is difficult but does not require extra modification. | Easy installation. |
| 13. | Maintenance is required. | Less maintenance is required. | Less maintenance required. |
Conclusion
In this article, you have learned about the difference between Roots, Twin Screw and Centrifugal Supercharger. If you like this article then don’t forget to like and share it.
