[Vwdiesel] Fwd: TDI Vanagon +'Q' talk
Hayden Chasteen
dieseltdi at verizon.net
Thu Jun 25 19:26:59 PDT 2009
The TDI inject directly into the injection chamber, they do not have a
precombustion chamber. There is a rather large indentation in the top
of the piston however. Hayden
On Jun 25, 2009, at 8:34 PM, brian gochnauer wrote:
> -
> - Are you guy's getting your knickers in a twist!!
> - That is an 86 to 94 set up It's not a TDI But a TD. Saying TDI
> stands for
> - turbo direct injector 'pump' is meaningless. You're quoting the
> name of
> the
> - pump. Like further down the page you have for the AAZ engine, a
> turbodiesel
> - direct injection injector pump or TDII
> - An n/a pump is a DI....
>
>
> I've been working on all kinds of diesels for 25 yrs, and I think VW
> marketing screwed up.
> All commercial diesels inject fuel "directly" into the cylinder.
> Old Caterpillar engines (70's), I worked on, are all 'pre-combustion
> chamber', or "pre-cup" engines, the fuel was injected into and
> ignited there
> and through a small hole was released into the cylinder, EXACTLY
> like ALL
> the early VW diesels, AAZ?, ALH and all the TD engines and most of
> the TDI.
> The only difference I can see is the CAT diesel has removable pre-
> cups and
> VW there cast into the head.
> CAT did come out with what they called a direct-injection engine
> because the
> tip of the fuel injector sits IN the cylinder.
> All CAT engines are DI now for fuel efficiency.
>
> The rub for me is that TD is for turbo-diesel and TDI is for
> Turbo-diesel-intercooler, I KNOW even the VW sales literature says
> TDI is
> turbo-direct-injection.
> marketing morons, if you ask me.
>
> The only true TDI, if you assume "di" means direct injection, for
> me, is the
> BEW which uses a unit injector (Pump-Duse) PD off of the camshaft lobe
> AND the end of the injectors is really "in the cylinder" , not using a
> pre-combustion chamber.
>
> The question I have is do any of the engines they called "TD" have
> intercoolers ?
>
> brian
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