Direct injection
A system in which fuel is introduced directly into the engine’s combustion chamber.
Reviewed 05.10.2026 · Version 2 · Scope: General
How to interpret it
The term describes where the fuel is injected. Petrol and diesel designs differ, and those differences should be preserved when interpreting documentation for a specific model.
Example
A hypothetical specification stating direct injection describes the engine’s fuel-delivery system; it does not by itself identify its fuel or power.
Why it matters to you
It makes it possible to understand the engine architecture and distinguish concepts that are often grouped under marketing acronyms.
Common points of confusion
It is not equivalent to a turbo or common rail: one describes forced induction, and the other a fuel-supply system for the injectors.
Documentary sources
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