WhiskyLassie
Well-Known Member
hey and welcome, don't be afraid of asking silly questions.
Colthebrummie
Well-Known Member
I always assumed TDI stood for turbo diesel injection. Since all diesel engines are fuel injected, any of them with a turbo must be a tdi
Col
Col
Turboman
Mab An Gov
Interceptorxj
Well-Known Member
Yes there is.
Colthebrummie
Well-Known Member
This is where I get confuddled. If fuel is fed into a combustion chamber via an injector, it is injected. Im not sure when manufacturers started using the description tdi but my earliest memory of it was the vw golf.
Col
Rotherham Rover
Active Member
Welcome to the forum
Turboman
Mab An Gov
Exactly. Direct injection, the atomised fuel is injected into a combustion chamber.
Indirect injection, the atomised fuel is injected into a pre-combustion chamber, or swirl chamber.
The vapour swirls around in that chamber, also gaining some heat from this, and is then sucked into the cylinder, where it is compressed by the piston until it ignites.
Colthebrummie
Well-Known Member
Thanks for your explanation, I keep hearing about swirl chambers on here but didnt really know what they where. I just imagined they were part of the combustion chamber design that agitated the atomised fuel.
Col
Turboman
Mab An Gov
They are a separate chamber, connected to the cylinder by a small port, through which the mixture enters the cylinder.
A lot of people are confused by them. It doesn't help that there are several names for them. We always called them swirl chambers, but some manuals use the term pre-combustion chambers, and Land Rover used the term hotspots in their manuals.
