News
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17 Jan 2012
Size matters?
07 Dec 2011
£1¼m investment in 5 axis Machining Capability
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
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Our objective with the 5-stroke engine is to develop a gasoline engine with fuel consumption and emission levels comparable to that of current diesel engines, without the serious problem of particulate and NOx emissions that plague diesels.
The engine concept, which was invented by Gerhard Schmitz, has been developed by Ilmor into a working engine using a rapid prototype cast cylinder head, a machined from solid cylinder block and separate electrically powered oil and water pumps. Two overhead camshafts operate the conventional coil spring valvegear with the HP camshaft running at 0.5 x crank speed and the LP camshaft running at 1 x crank speed. The engine is also turbocharged to increase the engine rating.
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5-stroke performance figures
- Engine capacity 700cc (turbocharged)
- Peak power 130 bhp @ 7000 rpm
- Peak torque 166 Nm @ 5000 rpm
- Fuel consumption of only 226 g/kWh
Advantages of the 5-stroke concept
- A secondary cylinder provides an additional expansion process enabling extra work to be extracted, hence increasing thermodynamic efficiency.
- The engine runs an overall expansion ratio approaching that of a diesel engine – in the region of 14.5:1
- Minimised pumping work due to the downsizing effect from highly rated firing cylinders.
- The compression ratio can be reduced to delay knock onset without a reduction in performance.
- Because the firing cylinders can be very highly rated, the engine is relatively compact.
- The fuel consumption does not rise as rapidly with increasing BMEP, as retarding rejects more energy into the expansion cylinder.
- The engine uses 100% conventional technology and so requires no new manufacturing techniques.
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