[Diy_efi] direct injection

[Avery Nisbet]

I have heard from VAG mechanics that they still have trouble with
this. This is with the current TSFI engines found in the audi's and VW
in the US.

Though TDI engines have been around for years I only hear of them
clogging up the EGR system not the intake ports.

I think most of this is due to EGR issues and dirty air.  Where else
would any substance that would/could coke on the intake port/valve
come from if you have DI.  The washing action of Port injection
probably helped with badly designed EGR systems in the past.

For DIY at home "testing" of DI, EGR systems could probably be avoided.

-Avery

On Thu, Sep 8, 2011 at 1:00 PM, Fred Cooke <fred.cooke at gmail.com> wrote:
> Early examples, from at least 1998, perhaps earlier, are to be avoided as
> they are usually prone to coking of the intake manifolds. Very bad coking -
> to the point of blockage! The earlier cars had a lot of trouble in many
> areas and were not reliable at all. If we're talking about DI. if we're
> talking about BMW Piezo DI, I have no idea.
>
> On Fri, Sep 9, 2011 at 7:18 AM, Avery Nisbet <anisbet at gmail.com> wrote:
>>
>> A lot the current car have these.
>>
>> GM has been using them in the eco-tec(FWD 4 cylinder) engine for a
>> while. ?Im sure there a few different injector styles.
>> The prices should come down in a few years. ?You may be able to find
>> specs by looking up after market replacements.
>>
>> The cruze should have these depending on market. ? The later model
>> year US market cobalts had them too.
>>
>> -Avery
>>
>> 2011/9/8 Mike <niche at iinet.net.au>:
>> > All I know its pretty high pressure, the latest bmw twin turbos use this
>> > with piezo driven
>> > injectors that cost $2200+ (AUD) each !? But they do get pretty
>> > reasonable
>> > fuel consumption of
>> > around 6L/100Kms with sizable power on demand - straight six 2 to 3L,
>> > seems like the next tech step but geesh does it cost !
>> > regards
>> > Mike
>> >
>> > At 02:48 AM 9/9/2011, ScottyGrover at aol.com wrote:
>> >
>> > Has anyone done any work on this type of fuel injection? I can't get any
>> > data from Delphi, even as to the physical size (length, stem diameter.)
>> >
>> > Scotty from Hollyweird
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