After adding ________, you improve the VE of the engine well over 100%.

After adding ________, you improve the VE of the engine well over 100%.

• A. turbocharger
• B. forced induction
• C. supercharger
• D. nitrous oxide

Answer: (B)

Volumetric efficiency is about how effectively the engine fills its cylinders with air. Under natural breathing, the piston and intake limitations keep this around, or just above, the displacement amount. When you introduce a method that forces more air into the cylinders, the air density in the charge increases and the engine can fill more than its nominal displacement would suggest. That pushes VE well above 100%. Forced induction is the mechanism that does this by compressing and pushing more air into each intake cycle. A turbocharger or a supercharger are both ways to achieve forced induction, leading to higher air mass per cycle and thus higher VE. Nitrous oxide, on the other hand, adds extra oxygen to the combustion mixture, enabling more fuel to burn, which boosts power. But it doesn’t mechanically increase the amount of air drawn into the cylinder on each cycle in the same way as boosting the intake pressure does, so it’s not the direct way to raise VE above 100% on its own. That’s why the broad concept of forced induction is the best fit for the idea of VE exceeding the 100% mark.

Volumetric efficiency is about how effectively the engine fills its cylinders with air. Under natural breathing, the piston and intake limitations keep this around, or just above, the displacement amount. When you introduce a method that forces more air into the cylinders, the air density in the charge increases and the engine can fill more than its nominal displacement would suggest. That pushes VE well above 100%.

Forced induction is the mechanism that does this by compressing and pushing more air into each intake cycle. A turbocharger or a supercharger are both ways to achieve forced induction, leading to higher air mass per cycle and thus higher VE.

Nitrous oxide, on the other hand, adds extra oxygen to the combustion mixture, enabling more fuel to burn, which boosts power. But it doesn’t mechanically increase the amount of air drawn into the cylinder on each cycle in the same way as boosting the intake pressure does, so it’s not the direct way to raise VE above 100% on its own. That’s why the broad concept of forced induction is the best fit for the idea of VE exceeding the 100% mark.