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26 Mar 08 12:10
4car.co.uk
Engineering consultancy Ricardo has completed initial testing of its innovative 2/4-stroke engine prototype.
This innovative 2/4Sight petrol engine, first reported here two years ago, has a direct-injection system with modified intake/exhaust ports, valve timing, boost supply and ignition which enables running in both two- and four-stroke modes, and seamless switching between the two modes.
The engine also incorporates a turbocharger and supercharger; a 2.1-litre V6, it is said to offer performance equivalent to that of a 3.4 V8, as well as fuel savings and much-reduced carbon dioxide emissions. Tested in a simulation of a 1,800kg large family car, it returned fuel economy improved by 27% compared to that car's usual 3.5 V6, and carbon dioxide emissions reduced from 260g/km to 190g/km, yet maintained its performance.
Ricardo has also developed a patented mechanical cam switching system to be used in the 2/4Sight engine. This 'represents a highly cost-effective means of implementation of this highly efficient combustion concept', says the company, and 'opens the way for packaging and integration of the 2/4Sight engine into a production vehicle'.
Ricardo spokesman Neville Jackson added: 'While significant further research and development challenges remain, not least in the vehicle demonstration of this advanced engine concept, the initial prototype development project has demonstrated the potential of 2/4Sight to offer improved gasoline fuel economy and reduced CO2 emissions, while also maintaining or improving vehicle performance. In addition to validating the 2/4Sight concept, the research project is also delivering significant benefits in terms of its many constituent technologies which are likely to see application in the more immediate term.'
4car.co.uk
Engineering consultancy Ricardo has completed initial testing of its innovative 2/4-stroke engine prototype.
This innovative 2/4Sight petrol engine, first reported here two years ago, has a direct-injection system with modified intake/exhaust ports, valve timing, boost supply and ignition which enables running in both two- and four-stroke modes, and seamless switching between the two modes.
The engine also incorporates a turbocharger and supercharger; a 2.1-litre V6, it is said to offer performance equivalent to that of a 3.4 V8, as well as fuel savings and much-reduced carbon dioxide emissions. Tested in a simulation of a 1,800kg large family car, it returned fuel economy improved by 27% compared to that car's usual 3.5 V6, and carbon dioxide emissions reduced from 260g/km to 190g/km, yet maintained its performance.
Ricardo has also developed a patented mechanical cam switching system to be used in the 2/4Sight engine. This 'represents a highly cost-effective means of implementation of this highly efficient combustion concept', says the company, and 'opens the way for packaging and integration of the 2/4Sight engine into a production vehicle'.
Ricardo spokesman Neville Jackson added: 'While significant further research and development challenges remain, not least in the vehicle demonstration of this advanced engine concept, the initial prototype development project has demonstrated the potential of 2/4Sight to offer improved gasoline fuel economy and reduced CO2 emissions, while also maintaining or improving vehicle performance. In addition to validating the 2/4Sight concept, the research project is also delivering significant benefits in terms of its many constituent technologies which are likely to see application in the more immediate term.'
