Horsepower of 4-cylinder Engines ```Name: ben brizzee Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 ``` Question: How much horsepower can you have in a 4-cylinder engine. Replies: The power output for an engine depends on a number of factors. First, it depends on the efficiency, which in turn depends on the engine geometry, combustion effectiveness (which depends on fuel air mixing, etc.) and also on the compression ratio. The compression ratio should be as high as possible, but is limited by the type of fuel used because auto ignition will cause undesirable burn characteristics in a spark ignited engine for example. In addition to engine efficiency, the power output is dependent on the amount and energy content of the fuel that is burned. Therefore, to know or be able to estimate the power output of a 4-cylinder engine, you will have to provide a little more information. The Carnot cycle efficiency for any engine represents the maximum efficiency that can be approached theoretically. This efficiency is equal to one minus the ratio of the absolute temperature of the burning fuel and the absolute temperature of the surroundings. david r munoz The amount of horsepower an engine can produce is controlled by the volume of the cylinder (cylinder), i.e. how many liters of displacement. Some cars, like small K-cars, have 1.9 or 2.0 liter engines which have about 100 horsepower or so. Fuel injection can also play a large role in power. Overall though, horsepower is usually defined by or is proportional to the number of RPM's the engine can sustain. A typical bicycler can only maintain about 1/4 horsepower in comparison. wildman jackson Click here to return to the Engineering Archives

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