| Diesel tuning is more important than we
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| | too little is low power with absolutely
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| think. Lets get down to the basics.
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| | NO smoke and just right is in the middle
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| Diesel is distilled crude oil
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| | of smoke and no smoke! There are a few
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| (Distillate). Unlike what most
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| | more complex settings on the pump that
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| 'Hollywood' movies promote of a diesel
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| | are checked and adjusted but these are
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| truck hitting a wall and exploding like a
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| | the main ones.
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| small nuclear bomb, oil does not readily
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| | Well, there are 6 injectors supplying
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| ignite, particularly a liquid form. If we
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| | fuel to the engine (Imagining it being a
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| atomise it though, it will burn readily.
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| | 6 cylinder diesel). Looks like it has no
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| The diesel principle relies on air being
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| | problems getting fuel, but what about the
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| compressed to approx. 500PSI. This in
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| | important part that we forgot about, AIR?
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| turn heats the air, turning it into the
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| | Well...it has to draw the air through a
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| igniter (diesels don't have igniters such
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| | maze. Filter, pipes, inlet manifold and a
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| as spark plugs). Heard of a glow plug?
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| | tiny inlet valve. This has to happen in a
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| Glow plug only glow on cold start-up to
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| | split second and the piston going down
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| help warm up the air in the combustion
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| | has to do all the sucking. That's the
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| chamber. A bit like when you are pumping
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| | governing part of a diesel engines
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| up a push bike tyre, the pump gets warm.
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| | performance. Remember more fuel for more
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| Ok, so you now have very hot air and you
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| | power is just more smoke! So we have to
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| inject diesel in through an atomising
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| | do something about the air to keep things
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| injector. As soon as the diesel leaves
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| | clean. This is where a Turbo system comes
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| the injector and enters the extremely hot
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| | into its' own with Diesel engines. With a
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| air the diesel ignites and combustion
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| | huge amount of air now available due to
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| begins. Put a poor atomising injector in
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| | the turbo supplying air right to the
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| the picture and you have a different
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| | inlet valve, the piston only has to suck
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| story. Because it is not atomising the
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| | air from there. Lets not forget that 1
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| diesel enough, the fuel volume burns
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| | cylinder has a suction stroke many times
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| erratically and slowly as the flame burns
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| | a second, so these fallacies of air being
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| through the large droplets of oily fuel.
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| | forced into the engine and blowing heads
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| If you were to light up a drum of oil,
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| | off with a turbo are only that! Now that
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| you would see a similar effect of slow
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| | we have more air, the fuel system can be
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| burning and smoke. You can imagine that
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| | set up according for more power.
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| by now the timing of the combustion
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| | [WARNING- This is where the whole
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| process is also upset. Add lower injector
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| | equation can come adrift with overheating
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| pressure than normal, due to age, and you
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| | etc. Things have to be set up by a
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| have the timing of the fuel ignition
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| | professional and a professional that
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| point changing even more (injector
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| | knows his JOB!]
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| opening too early). The injectors doing
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| | One last note; the diesel system that is
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| this alone can make a diesel smoky and
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| | on all 4WD diesels was designed to run on
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| sluggish. On a cold morning, the
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| | a fuel with certain burning
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| combustion is even further retarded due
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| | characteristics. We don't seem to be
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| to cold cylinders and cool combustion and
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| | getting fuel in Australia meeting all
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| you also get hard starting.
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| | these requirements. We have new vehicles
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| This scenario changes completely with
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| | smoking that obviously are not designed
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| correctly set up injectors. Remember the
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| | to smoke when running on real diesel. So
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| drum of oil? Well, if you could fill the
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| | when setting up a fuel injection system
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| drum with a misty vapour of oil and light
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| | for tuning we have to take the burning
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| it up, you would not only get a large
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| | characteristics of this poor diesel into
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| bang but it would be over within a flash.
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| | consideration. Try to get your fuel from
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| A good injector sprays fuel out as a mist
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| | a reputable and 'known brand' garage and
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| and the fuel burns rapidly and relatively
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| | keep your receipts. If you have problems,
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| clean as the droplets are so small that
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| | you then have as much 'come-back' on the
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| they burn with a puff! A correctly set
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| | fuel garage as you have with a faulty
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| injector pressure also means the fuel is
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| | product from a shop.
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| being injected at the correct time.
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| | Safe 4WDriving,
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| Now, the injectors are perfect but the
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| | The Diesel Experts
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| injection pump could be slightly out of
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| | Footnote: The modern diesel has come a
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| tune. Timing has to be set. If it is too
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| | long way from its beginnings!! Well...so
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| early the vehicle can smoke and become
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| | we are all lead to believe!! That's where
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| quite 'diesel noisy' and if it is too
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| | it all stops. In fact about the only
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| late, the vehicle can feel sluggish.
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| | thing that could compare is reinventing
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| Imagine the spray of fuel as a fist about
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| | the round wheel!! That's right. Nothing
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| to hit the piston. If it is hit too far
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| | has really changed. A diesel still needs
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| before top dead centre it would not only
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| | fuel and air. Even though we now have
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| hurt your fist and the piston but it
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| | trendy things like 'Common-rail High
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| would make a louder than normal bang as
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| | Pressure Injection and Electronics
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| the two things hit head on. If the piston
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| | controlling everything, it is still the
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| had gone past top dead centre and was
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| | same old principle. The only major change
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| hit, the force of the hit would be going
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| | appears to be the repair costs... as
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| down with the piston so you would have
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| | usual. Most 'high tech' injectors now
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| too little impact on it. So you can see
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| | cost over $2000 each and are 'throw
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| why timing is critical for maximum hit
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| | away'. Most Injector pumps are becoming
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| effect! Other things need to be checked
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| | 'throw away' at around $6500. Where will
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| like the fuel volume delivered by the
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| | it end??
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| pump. Too much is power but with smoke,
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