In the UK we have an annual test, the MOT, part of
this is a smoke test, common advice for cars that fail
the smoke test is to and give it the "itallian",
filling up with Bio is also useful as it cleans the
fuel system and burns cleaner. Just drive at highway
speeds (60mph, 100kph = 4.5kRPM) in third for a few
miles. This cleans out the combustion chambers by
burning up coked on deposits thus reducing particulate
emissions (smoke). If you just want a bit of a bigger
kick from the engine a bit of kerosene can be used as
injector cleaner, but always mix it with veg oil or
bio because its got poor lubricity. Having a
hydractive citroen I also have to 'exercise' the
suspension regularly which is another great excuse for
a Back-Road blast.
--- Erik Lane <[EMAIL PROTECTED]> wrote:
> i've never heard of this 'italian tune up' but i
> guess
> if an injector gets clogged then pushing more volume
> thru it could affect it. i don't know much of the
> theory at all.
>
> tho if i have an issue like this with a diesel that
> isn't being pushed you can bet i'll try it! it's too
> easy and cheap to not at least give it try. seems
> rather painless. (even too much so, kinda urban
> legend
> like, but still worth a try.)
>
> --- Keith Addison <[EMAIL PROTECTED]>
> wrote:
>
> > How about what Ed Beggs calls an Italian tune-up?
> > (Pardon me Ed.)
> > What's the general opinion of Italian tune-ups
> > anyway?
> >
> > >By the way, all, how many have heard of the
> > "Italian tuneup"? You see it
> > >mentioned a lot on the Merc discussion groups, as
> > at the terrific resource
> > >at www.mbz.org
> > >
> > >It is really indispensable on all these diesels -
> > basically it's take the
> > >thing out and floor it - often. Some say once a
> day
> > full power acceleration
> > >("floorboarding it") on a Merc is the best thing
> > for it.
> > >
> > >(Of course, on the old 240's and 300's this is
> how
> > you drive them anyway,
> > >just to get them moving!)
> > >
> > >We have seen it at least twice now, where
> injectors
> > were plugged up from
> > >long term "babying" and urban driving of the
> > diesel, and the car in one case
> > >was acquired for $500 - and promptly turned into
> a
> > $1500 car after a 10
> > >minute "tuneup" of this nature. It is of value
> > particularly for SVO users to
> > >know that diesels are meant to be worked, not
> > driven around easy at low rpm
> > >all the time!
> > >
> > >(In the second case, the engine knocked and ran
> so
> > poorly that even our
> > >local best, most honest and reliable VW shop
> owner
> > was convinced it needed
> > >an engine overhaul. A floorboarded trip a long
> hill
> > solved the problem and
> > >it ran wonderfully). Just be careful of not
> blowing
> > old coolant hoses,
> > >overheating, etc. Just a minute or two. And take
> > long highway trips, and
> > >don't run in overdrive around town.....keep those
> > rpm's up.
> >
> > How does that square with what Todd says about
> > giving it more fuel
> > than it can burn?
> >
>
> i think that a few parts of todd's post are in
> error,
> but i'll reply here to keep it down to one post from
> me rather than multiple. i hope that everything
> remains clear. if not let me know and i'll split it
> up
> next time.
>
> todd mentions that black smoke is a result of
> basically being too lead-footed. i don't believe
> that's true. a diesel in tune and good shape will
> only
> smoke a little, even when revving and at full
> throttle. if the injection system is working
> correctly
> then it will not put too much fuel into the
> cylinders.
> each cylinder is only so big and can hold so much
> air.
> there is a certain amount of fuel that can be burned
> efficiently in that much space and that is all.
> (talking about non turbo here. with a turbo the
> space
> can burn more, but there's still a limit - this time
> based on the amount of air shoved in there.) so each
> injection pulse should be limited to that much. i've
> heard that sometimes they're set to just a hair
> above
> so that there's excess diesel and every bit of o2 is
> used.
>
> but heavy black smoke in a diesel under load is most
> often worn or dirty injectors, in my experience.
> (although it could also be that the max fuel setting
> on the injection pump is too high. ) when they get
> worn the tiny injection holes lose their perfect
> shape
> and the fuel isn't atomized as well. so there are
> many
> larger drops. it's harder for the diesel to burn
> when
> it's not in contact with the air, as in the middle
> of
> a drop. so it's better, of course, to get the drops
> to
> be as small as possible. for that new or rebuilt
> injectors are in order. the better efficiency can
> give
> you more power and better fuel economy, all in one.
>
> good luck!
> erik
>
> > You can get good acceleration without being
> > leadfooted, just keep the
> > throttle ahead of the revs, no need to floorboard
> > it. What's required
> > for this effect, acceleration or high rpm or both?
> > Still no need to
> > pump too much fuel in, you can maintain high rpm
> > short of full
> > throttle too, on much less than with fast
> > acceleration.
> >
> > Best
> >
> > Keith
> >
> >
> >
> > >Yet another of my random and crazy questions,
> > >
> > >It bothers me that my diesel puts out black smoke
> > when it starts or
> > >is going up a steep hill.
> > >
> > >I recently discovered an oxygen tank in our
> > basement probably for my
> > >greatgrandfather.
> > >
> > >The black smoke means that there is an incomplete
> > reaction probably
> > >caused by insufficient oxygen. So what if I were
> to
> > feed some oxygen
> > >to the air filter of the engine?
> > >
> > >I know it will overheat because of more
> combustion,
> > but
> > >theoretically it shouldn't overheat too much
> since
> > I wont be using
> > >it all the time and I wont be playing with the
> > amount of fuel
> > >injected.
> > >
> > >Kinda like a NOS system without the cooling and
> > preassurising effect.
> > >
> > >
> > >Thanks for your time if you bother to answer
> > >
> > >Teoman
> >
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> >
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> > http://infoarchive.net/sgroup/biofuel/
> >
>
>
>
>
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