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The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine at 600 rpm with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane. [8]
In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2". All states require gas pumps to be labeled with the correct octane level and nearly all states do regular testing to make sure gas stations are in compliance. A minimum 82 octane fuel is recommended for most vehicles produced since 1984.
Power-to-weight ratio: Supercharger: no Fuel system carburetor: Fuel type 80 octane gasoline (petrol) 80 octane gasoline 80 octane gasoline Ignition magneto: Compression ratio: 6.5:1 Dry weight 2332 lb (1058 kg) 2554 lb (1158 kg) 2647 lb (1200 kg)
180 hp (134 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the A1G except its crankcase has a propeller governor drive mounted on the left front instead of on the engine accessory housing. [1] [2] O-360-A1H6 180 hp (134 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1.
For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.
The two variants shared the same bore, stroke and compression ratio. The C85 produced ten extra horsepower by virtue of having a maximum permissible rpm of 2575 versus the 2275 of the C75. [1] The C75 was in production from 1943 to 1952 and the C85 from 1944 to 1970.
It includes iron cylinder liners, balancer shaft located within the vee, maximum compression ratio of 11.2:1, bore and stroke of 84.5 mm × 89 mm (3.33 in × 3.50 in
High percentage ethanol mixtures are used in some racing engine applications as the very high octane rating of ethanol is compatible with very high compression ratios. Ethanol fuel mixtures have "E" numbers which describe the percentage of ethanol fuel in the mixture by volume, for example, E85 is 85% anhydrous ethanol and 15% gasoline. Low ...