Please see the details of Orbital Engine's fuel injection technology here:
http://www.orbeng.com.au/orbital/orbitalTechnology/combustProcess_lowpressure.htm
The Orbital injection system uses a puff of low pressure air to atomise the fuel via a direct cylinder injector. According to a fellow I've been chatting with at Orbital, the air compressor pump driving the injector has a volume of 3cc. The engine's primary source of combustion air comes via conventional piston ports from atmospheric pressure air.
Because the Orbital system does introduce 3cc of air per rev to the combustion chamber, would the rules treat this fuel injection system as though it were a supercharger?
thanks,
-Brian
Orbital Engine's fuel injection: Is it a supercharger?
Moderator: DLRA
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garth04
Orbital Technologies
Air compressor
A small compressor, typically a belt driven single cylinder 20cc to 40cc reciprocating unit for automotive applications, supplies the low-pressure air required for the direct injection process. Motorcycle applications use a smaller compressor, mounted on the crankcase and driven from an eccentric cam on the crankshaft.
yes it is classed as supercharged
Garth
A small compressor, typically a belt driven single cylinder 20cc to 40cc reciprocating unit for automotive applications, supplies the low-pressure air required for the direct injection process. Motorcycle applications use a smaller compressor, mounted on the crankcase and driven from an eccentric cam on the crankshaft.
yes it is classed as supercharged
Garth
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weezilco
Well, looking rather narrowly at the system, based only upon the fact that a very small amount of air is used to atomise the fuel, I can see that the system might be viewed as a supercharger- but it would indeed be a very narrow definition.
The amount of air injected, by itself is insufficient to support combustion. In both the automotive & motorcycle applications of the Orbital system, air for combustion is drawn into the cylinder via conventional piston ports from atmospheric pressure air.
The 20-40cc puff figure is for automobile engines. The injection system for the 50cc engines uses only a 3cc puff per intake stroke. A normally aspirated 50cc 2-stroke can draw about 80cc of air per rev just from the atmosphere.
So, considering that a supercharger is intended to increase the amount of air molecules available to support the combustion process, the Orbital system- to me- would be hard to categorise as such as it introduces so little air compared to the needs of the combustion process.
With this extra detail, does the Orbital system still look like it could be called a supercharger?
seeya,
-Brian
The amount of air injected, by itself is insufficient to support combustion. In both the automotive & motorcycle applications of the Orbital system, air for combustion is drawn into the cylinder via conventional piston ports from atmospheric pressure air.
The 20-40cc puff figure is for automobile engines. The injection system for the 50cc engines uses only a 3cc puff per intake stroke. A normally aspirated 50cc 2-stroke can draw about 80cc of air per rev just from the atmosphere.
So, considering that a supercharger is intended to increase the amount of air molecules available to support the combustion process, the Orbital system- to me- would be hard to categorise as such as it introduces so little air compared to the needs of the combustion process.
With this extra detail, does the Orbital system still look like it could be called a supercharger?
seeya,
-Brian
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garth04
supercharged
Yes
Even if it is putting in 1cc of air it still is a driven compressor
Garth
Even if it is putting in 1cc of air it still is a driven compressor
Garth