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During the compression stroke of an internal combustion engine, the temperature of the air-fuel mix rises as it is compressed, in accordance with the ideal gas law. Higher compression ratios necessarily add parasitic load to the engine, and are only necessary if the engine is being specifically designed to run on high-octane fuel.
Fuel type: 87 octane rating gasoline; ... Compression ratio: 7:1; Power-to-weight ratio: 0.64 hp/lb (1.05 kW/kg) See also
For example, motorcycle racing engines can use compression ratios as high as 14.7:1, and it is common to find motorcycles with compression ratios above 12.0:1 designed for 95 or higher octane fuel. Ethanol and methanol can take significantly higher compression ratios than gasoline.
Fuel type: Gasoline 87 Octane; Oil system: pressure; Cooling system: Liquid/water; ... Compression ratio: 5.6:1; Specific fuel consumption: 0.295 kg/kWh (0.485 lb/(hp ...
Fuel type: 87 octane rating gasoline; ... Compression ratio: 6.5:1; Specific fuel consumption: 0.24 kg/PSh (0.536 lb/(hp⋅h); 0.326 kg/kWh) at 2,100 rpm;
An engine tuned for LPG fuel via higher compression ratios (typically 12:1) improves the power output. This is because higher-octane fuels allow for a higher compression ratio without knocking, resulting in a higher cylinder temperature, which improves efficiency. Also, increased mechanical efficiency is created by a higher compression ratio ...
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For RWD based applications, the 2.0L turbo MPI in the 2009–2012 Genesis Coupe, compression ratio is 9.5:1 and it produces 210–213 PS (154–157 kW; 207–210 hp) at 6,000 rpm and on 91 RON/87 octane gasoline, and 226 PS (166 kW; 223 hp) at 6,000 rpm on 98 RON/93 octane . Torque remains the same at 30.5 kg⋅m (221 lb⋅ft; 299 N⋅m) at ...
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