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Variable Piston Compression Tech Could Improve Fuel Economy by 6%

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  • Variable Piston Compression Tech Could Improve Fuel Economy by 6%

    by NGT Staff, Apr 14, 2016
    FEV North America is working on a variable cylinder compression that reduces emissions and improves fuel economy by up to 6%, reports Wards Auto. The technology could allow bi-fuel vehicles to switch from gasoline to compressed natural gas without any [Read More]

  • siai47
    replied
    Right on Cowboy--either a VNT (variable nozzle) or regular wastegate controlled turbocharger. One boost pressure for CNG, one for gasoline with a knock sensor to cover the gambit of different octane levels when running on RUG. Turbocharging also helps make up for intake system losses. Any port injected CNG engine looses power because the actual volume of air entering the cylinder is constrained by the volume of methane mixed into it effectively reducing the intake runner size which results in lower power output. Plus you are recapturing waste heat from the exhaust and doing something useful with it---instead of melting the catalytic converter.

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  • cowboy
    replied
    sounds much simpler to use a variable turbo

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