News
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05 May 2010
Viper Motorcycle Company, a wholly owned subsidiary of Viper Powersports Inc., announced today delivery of the first re-designed production short stroke engines for the 2011 Viper build.
09 February 2010
Ilmor announced today they have successfully run the first prototype Ilmor - Viper Motorcycle Company engine on the dyno ahead of schedule and are already seeing promising results.
07 October 2009
Ilmor Engineering is pleased to announce that its presence at the Professional Motorsport World (PMW) Expo in Cologne, Germany from 3rd-5th November
26 August 2009
Ilmor Engineering Ltd has achieved ISO 9001:2008 certification through TUV UK, demonstrating our longstanding commitment to the quality of Ilmor’s products and customer satisfaction
12 August 2009
With its first prototype Five-Stroke having achieved an impressive fuel consumption figure of 226g/kWh, engine designer and manufacturer Ilmor Engineering is planning a second phase development engine...
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Principle of operation
The 5-stroke concept engine utilises two fired cylinders (High Pressure - HP) operating on a conventional 4-stroke cycle which alternately exhaust into a central expansion cylinder (Low Pressure - LP), whereupon the burnt gases perform further work. The LP cylinder decouples the expansion and compression processes and enables the optimum expansion ratio to be selected independently of the compression ratio.
Running of the concept engine has produced impressive fuel consumption readings over a very wide operating range. This is because at the onset of knock a greater percentage of work can be extracted in the LP cylinder, giving a degree of self compensation.
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Further development
Having run the proof of concept engine, Ilmor is now looking to produce a second phase development engine for in-vehicle testing. The performance targets for this engine are as follows:
- Brake Specific Fuel Consumption of 215 g/kWh
(10% improvement on current 4 stroke technology)
- 20% lighter than existing production engines
- Power density of 150 bhp/L
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5-stroke display engine
To showcase the exciting 5-stroke principle Ilmor have produced a cutaway display engine which allows the viewer to not only see directly into the cylinder head and combustion chamber but to also manually crank the engine.
This interaction allows the viewer to see and control the piston movement and to understand the timing of the inlet and exhaust valves which are used to achieve the 5-stroke operation.
The first public appearance of the new 5-stroke display engine was at the Engine Expo in Stuttgart in June 2009.
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