Direct Injection
Direct injection sprays fuel straight into the combustion chamber instead of into the intake port.
What is Direct Injection?
All modern diesels and most modern petrol engines use direct injection. Petrol versions are often called GDI, TSI, TFSI or similar. It allows precise fuel control, higher compression and better efficiency. A high-pressure pump driven by the camshaft supplies the fuel rail.
How it works
The injector opens for very short times, sometimes several times per cycle, at high pressure.
Why it matters for your car
Because fuel no longer washes the intake valves, carbon deposits can build up on them. Direct injection petrol engines also produce more fine particles, which is why many now use particulate filters.
Other terms
- 800-Volt Architecture
- Alternator Pulley (Overrunning Pulley)
- Body Filler
- Brake Booster
- Defensive Driving
- Dielectric Grease
- Drive-by-wire (Electronic Throttle)
- Exhaust Leak
- Fuel Level Sensor
- Fuel Tank
- Lead Loading (Body Solder)
- Malfunction Indicator Lamp (MIL)
- Oil Viscosity (Grade)
- SCR (Selective Catalytic Reduction)
- Seatbelt Height Adjuster
- Seatbelt Reminder
- Sequential Indicators (Dynamic Turn Signals)
- Transverse Engine
- Ultrasonic Parking Sensor
- Valve Cover Gasket (Rocker Cover Gasket)