ALL Diesels, turbo or naturally-aspirated, inject the fuel directly into
the combustion chamber. That's how their ignition is timed. No Diesel
injects into the intake manifold. VW might call it TDI because of the
direct injection, but that's not because it's special or unique to VW
engines.

Brian Running wrote:
Early VW 1.6 and 1.6 diesels do not inject directly into the combustion
chamber. Instead, the fuel is injected into a pre-combustion chamber where
combustion starts. The burning gasses then spread into the combustion
chamber. These engines are referred to as IDI for indirectly injected.
Non-turbo directly injected engines are referred to as DI and turbo directly
injected engines are referred to as TDI. Search IDI and VW and you can
learn about them.

Brian Running wrote:
The "Direct Injection" refers to the fuel being injected directly into
the combustion chamber instead of a *prechamber* not the intake
manifold. Most Diesels up until recently injected the fuel into a
prechamber.

http://en.wikipedia.org/wiki/Indirect_injection

nate

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That explains the TDI nomenclature -- but no Diesel injects into the
intake manifold. A pre-combustion chamber is part of the combustion
chamber.