8/25/2023 0 Comments Airflow performance fuel pump gpmOne-half pound of fuel per horsepower per hour (0.50 BSFC) is the default norm for most calculations, but we can be more specific in many cases.īSFC = observed HP ÷ observed fuel flow in pounds/hour Guidelines for evaluating BSFC are well established and are frequently used to predict engine performance. In the performance world, we use it to judge the efficiency contribution of various engine combinations and to predict certain requirements such as fuel injector flow rate.Ī particular cylinder head may be found to make more power with less fuel, and that’s an indicator of higher efficiency, probably due to improved cylinder filling and a more efficient combustion chamber that extracts more energy from a given fuel mass. BSFC figures are typically quoted for wide-open-throttle conditions, but it is also a measurable quantity that relates to fuel economy at part throttle operation. There is a range of optimum efficiency for most engines, and BSFC defines that range.Īs you may have already surmised, the term “brake” precedes it because BSFC is usually measured with an engine running on a dyno. More specifically, it is the rate in pounds of fuel per horsepower per hour that a given engine consumes to make power. ![]() ![]() Many people mistakenly believe that it is an indicator of rich or lean fuel mixtures, but it is actually a measure of efficiency that indicates how well the engine uses the fuel it burns. Brake specific fuel consumption (BSFC) is frequently misunderstood.
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