Volumetric Efficiency
Volumetric efficiency describes how well an engine fills its cylinders with air compared with their theoretical volume.
What is Volumetric Efficiency?
It is given as a percentage. Naturally aspirated engines usually stay below 100 percent. Turbocharged engines can exceed 100 percent. Engineers improve it with tuned intake runners, variable valve timing and multiple valves per cylinder. Speed-density fuel systems calculate air mass with a volumetric efficiency table and the MAP sensor.
How it works
Intake design, valve timing and engine speed decide how much air enters each cylinder.
Why it matters for your car
Blocked air filters or intake leaks reduce it. Engine control units use it to calculate fuel quantity.
Other terms
- 12-volt Battery In Electric Cars
- Ambient Temperature Sensor (Outside Temperature)
- Automatic Emergency Braking (AEB)
- B-Pillar
- Battery Registration (Battery Coding)
- Battery Warning Light (Charging Light)
- Brake Bedding-in
- Choke (Cold Start Enrichment)
- Degreaser (Engine Cleaner)
- Ethanol Fuel (E10, E85)
- Lane Change Assist
- Onboard Charger
- Positive Earth Electrical System
- Rear-View Mirror (Interior Mirror)
- Rear-wheel Steering (Four-wheel Steering)
- Regenerative Braking
- Spare Wheel
- Stabiliser Hitch
- Wheelbase
- Windscreen Demisting (Defrost)