| Technical Information: DiTech Ins and
Outs - Learn how a DiTech Works |
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Many
people have asked me what exactly the difference is between a DiTech
scooter and a carbureted scooter. Well quite simply a DiTech
is a fuel injected scooter and doesn't have a carburetor. Most
people know this, but don't understand what that involves on a
2-stroke motor. So I am going to try and lay it out in
laymen's terms in hopes that everyone will understand. |
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Carbureted Motor |
| Well lets first start with a carbureted
scooter. In the picture to the right you can see that air and
fuel are mixed in the carb (red). Then the mixture goes toward
the reed valves and oil is added into the mix. Now the mixture
of air, gas and oil are dumped into the crank case through the reed
valves (blue). The spinning crank tosses and churns this
mixture around. This is not only your fuel, but it is also
your engines lubrication. Then the explosive mixture is drawn
into the ports of the cylinder where it will be compressed and
ignited (green). |
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| Direct Injected Motor |
| Now on a DiTech motor there is
obviously no carburetor. It has been replaced with what is
called a throttle body. All the throttle body does is regulate
how much air goes into the motor (red). In the photo to the
left, you can see that NO gas is put into the crank like a carb
scooter does. Only air and a very small amount of oil is
entering the crank through reed valves (blue). This is why you
CAN NOT use a premix oil in a DiTech. Since there is no gas
mixing with the oil, the oil remains much thicker and much less oil
is needed for proper lubrication. This is why a DiTech scooter
uses much less 2-cycle oil. Also since the oil is thicker much
less oil is pulled into the cylinder. This results in much
cleaner burning than a typical 2-stroke motor. In the top of
the motor, there is a mini air compressor. This compressor
pressurizes air from the crank to approximately 85PSI and pumps it
into the injection head (purple). The fuel is also pressurized
by a fuel pump and this pressurized gas goes to the fuel injector.
Then the compressed air is introduced to the gas by the air
injector. Then the pressurized mixture of air and gas is shot
into the cylinder (orange) which atomizes the gas into a very light
mist, which gives you faster burning, more horsepower, and less fuel
consumption. |
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| Now after understanding all
of that, you should understand some of the pros and cons of each.
The main pro of a DiTech is that it is much more fuel efficient and
much cleaner burning. The main con of a DiTech is it is much
harder to modify performance characteristics since it is all
controlled by an ECU (small computer), and there is currently no way
of making your injector larger to increase your fuel supply. Fuel
injected 2-stroke motors are relatively new technology. But I
personally feel that carbureted 2-strokes will fall by the wayside
much like carbureted cars have disappeared off the market.
When this happens, and as technology improves, there will also be a
much larger demand for performance parts like larger injectors.. |
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