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Several auto makers from around the world showed great interest in the engine, however it was realised that there was still at least $ 100 million of development work required to commercialise the engine and the funding sources decided this was not a sound investment. Instead it was realised the same
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In the patent, the engine is described as two stroke internal combustion engine, but the patent claims that with a different valve mechanism it could be used as a four stroke engine. However most of the development work was done on four stroke versions with both poppet and disk valve arrangements. A
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The engine promised to be about one third the size and weight of conventional piston engines due to the compact arrangement of the combustion chambers. Another advantage is that there is no high-speed contact area with the engine walls, unlike in the Wankel engine in which edge wear is a problem.
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and
Federal Government R&D grants, worked on the concept from 1972 until 1983 and had a 3.5L four stroke engine performing as well as the similar petrol car engines of the day at typical road load conditions. A technical paper was presented to the
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in
Australia, dubbed Festiva EcoSport, and the verdict is that while the car is somewhat more powerful than the Ford Festiva 1.3, it failed in to deliver emission compliance, efficiency, and NVH (noise, vibration, harshness) reduction at same time.
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While the Wankel engine rotor has line contact with the internal surface of the housing, the concentric rotary vane internal combustion engine rotor has plane contact with the cylinder. Wankel engine is basically an orbital engine because its
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Direct
Injection: The Orbital Combustion Process An Australian company named Orbital Engine started working on cleaner burning two-stroke engines in the 1980s. The company developed a unique pump for direct injection systems, and at
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Another disaster was the
Federal Government doling out funds to assist Ralph Sarich develop his revolutionary orbital engine. In 1972, he won an inventors' competition and a few years later he floated the company on the stock
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Interestingly, in his seminal book researching and documenting all the possible ways to create a rotary piston displacer, Felix Wankel shows the orbiting piston and reciprocating vane mechanism used in the orbital engine.
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A major reason for the good performance of this engine was the development of a unique and patented injection system directed into the combustion chamber which created a stratified charge combustion process.
120:. (2 cylinder unit), installed by Sangeet Hari Kapoor when he was working in PT Wahana Perkasa Auto Jaya, which is a company under the Texmaco group. The 3 cylinder unit is also installed to 100 units of
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However, the combustion chambers are divided by vanes which do have contact with both the walls and the orbiting piston and are more difficult to seal due to the eight corners of the combustion chamber.
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injection and combustion system could be adapted onto existing two and four stroke petrol engines and this work become the future of the company, being called the
Orbital Combustion Process.
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Large surface to volume ratio combustion chamber which leads to larger combustion chamber heat losses and so loss of power, which can be greatly reduced using
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by using a generally prismatic shaped piston that orbits the axis of the engine, without rotation, rather than the rotating trilobular rotor of the Wankel.
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Long sealing paths and multiple corner seals which mean it is harder to contain the chamber gases and so there is some loss of pressure and thus power.
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supercharger is required if operated in two stroke mode since crankcase pumping can't be used to charge the combustion chamber.
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The orbital engine has two of fundamental design issues, which also plague the Wankel engine:
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448:"Engine History: The Sarich Orbital Engine - Sometimes A Dead End Can Lead Somewhere"
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229:. Vol. 22–23. Science and Technology Information Institute. 1997. p. 17.
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473:"Second generation Ford Festiva / Aspire | Science Museum Group Collection"
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perspective view with the exhaust end cover and chamber end plates removed
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During prototyping process, the engine has been installed in 3 vehicles:
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Engine incorporating OCP (Orbital
Combustion Process), on display in
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in 1982, and is now part of their historic transaction collection.
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421:"Why the Australian Orbital two-stroke engine never took off"
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as before but with the vane and cam member also removed
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The
Orbital Engine Company, with funding from partner
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27:Type of internal combustion engine
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317:Ewing, Peter (1 February 1982).
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380:"How the Sarich vision stalled"
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226:Philippine Technology Journal
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292:. Pascal Press. p. 59.
265:. London: Iliffe Books Ltd.
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348:John Ettlie (7 June 2007).
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354:. Routledge. p. 204.
323:SAE Technical Paper Series
289:Excel HSC Business Studies
49:internal combustion engine
446:Roverdog (29 July 2020).
509:Pistonless rotary engine
88:Research and Development
286:Louise Fleming (2004).
116:(3 cylinder unit), and
263:Rotary Piston Machines
261:Wankel, Felix (1965).
194:Powerplus supercharger
51:, invented in 1972 by
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514:Australian inventions
407:"Vehicle Integration"
405:Kapoor, Sanget Hari.
139:stratified combustion
45:Sarich orbital engine
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319:"The Orbital Engine"
386:. 27 September 1996
351:Managing Innovation
189:Orbital Corporation
55:, an engineer from
129:Technical problems
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519:Engine technology
361:978-1-136-38386-1
299:978-1-74125-071-8
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482:18 February
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503:Categories
272:0592006166
211:References
305:exchange.
61:Australia
425:WhichCar
183:See also
149:Drawings
71:Overview
38:Jakarta
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205:Hughes
203:Cecil
57:Perth
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