News
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05 May 2013
Chevrolet IndyCar V6 Drivers Score Three Top-Five and Five Top-10 Finishes in Fourth Race of 2013 Season
04 May 2013
Defending IZOD IndyCar Series Champion Sets New Track Record
07 Apr 2013
With Strong Run, Helio Castroneves Takes the Points Lead
06 Apr 2013
Defending IZOD IndyCar Series champion Ryan Hunter-Reay will start the No. 1 DHL Andretti Autosport Chevrolet from the pole of tomorrow’s Grand Prix of Alabama at Barber Motorsports Park
24 Mar 2013
Team Chevy Drivers Capture Top-Four Finishing Positions and Six of Top-Seven
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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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