Re: [T3] Dual 40 DCNF Carbs

[Jens Vagelpohl <jens@dataflake.org>]

<x-flowed>the only failure modes i have seen with l-jetronics so far is 
backfiring into the intake tract, which can possibly bend the airflow 
meter's flap. that's it. i never had any other fuel injection problem 
in the 9 years/30,000 miles i had my 412 wagon so far.

a vacuum control unit that seems much more dependent on close 
tolerances to work correctly seems more brittle to me. not to mention 
the mechanics i have spoken to who told me of cars being sent from vw 
shops to bosch shops and back because no one wanted to work on 
d-jetronic cars...

besides, just like keith mentioned, very similar air-flow controlled FI 
systems were used until a few years ago when air-mass metering 
supplanted air-flow metering.

jens


On Thursday, Sep 19, 2002, at 22:07 US/Eastern, Keith Park wrote:

> Uh Oh... one of those rare moments that I differ from Jim..
>
> I have the L Jet on my Opel... and for the first 170K or so it was 
> flawless,
> although my father tweeked things a bit when it was new.  The air 
> meter,
> with the vane, was used well into the 90's at least and is quite well
> designed and seems to have a very long service life, there is very 
> little
> issue with wear if nobody messes it up.  There is no pressure sensor 
> with
> brass bellows to have the solder seam fail on.
>
> Fragile wiring?  the connectors are MUCH improved with a positive snap 
> lock
> and better sheilding against water and dirt, and the rubber covers 
> seem to
> hold up better.
>
> Perhaps the biggest plus is the lack of trigger contacts to get dirty 
> and go
> intermittant.
> I may well use L jet on my Notch when I convert it.
> Kjet?  I cant get the idle smooth on my Golf... there is only one 
> mixture
> adjustment... boy I wish there were some electronics I could fiddle 
> with ...
> :-)
>
> Keith
>
>
> > The 74 type 4 came with L-Jetronic which was the same family as used 
> > on
> > Beetles. I don't agree that this system is more robust. This has a
> pivoting air
> > flap and potentiometer which I find to make this system quite 
> > fragile. In
> my
> > opinion the L-Jetronic systems are the worst of all FI worlds: They 
> > have
> all
> > the fragile wiring of the D plus the constantly moving and wearing air
> flap.
> > The later K-Jetronic FI as use on Rabbits, etc got almost completely 
> > rid
> of
> > the electronics which scares off so many people. It's really a pretty 
> > good
> > system.
> >
> > I still like the D, but it takes some getting used to.
> >
> > -
> > *******************************
> > Jim Adney, jadney@vwtype3.org
> > Madison, Wisconsin, USA
> > *******************************
> >
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>
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