FUEL INJECTION

Fuel Injection and Servicing

Fuel injection systems accurately mix fuel with air for optimal energy release in an internal combustion engine. Fuel Injection has replaced carburetors for mixing and delivering fuel accurately in modern road vehicles.

EFI - Electronic Fuel Injection
The fuel injection system is controlled by a mini-computer or Electronic Control Unit (ECU) that monitors a series of temperature sensors and oxygen or lambda sensors that provide feedback that can be used to optimise fuel efficiency and power under a variety of conditions

Engine Mapping

The ECU is pre-programmed with software that has data on engine performance under different engine speed and acceleration conditions. It refers to this Data Map when deciding the optimal fuel air mixture for power or fuel efficiency. The ECU can be replaced or re-mapped to electronically alter the engine performance characteristics

In principal, it's possible for the same EFI system to deliver optimal performance for different fuel types by monitoring feedback of the amount of oxygen and hence unburnt fuel in the exhaust gas

Fuel Pump and Fuel Atomisation

A fuel pump fitted inline between the fuel tank and engine; forces or injects fuel into the ignition chamber through a tiny aperture in a fuel injection nozzle under high pressure. The fuel atomises into tiny particles increasing the surface area of the fuel for efficient combustion with air

Diesel Fuel Injection

Diesel engines operate at much higher compression ratios than petrol engines. Also, diesel fuel has a much higer flashpoint or ignition point than petrol. When the engine first starts, ignition relies on a heated glow plug. Once the engine is running and warmed up there is sufficient energy available to cause auto-ignition of the fuel-air mixture in the ignition chamber.