Although each Fuel Consumption Kit consists of the same items, the size of the meter and the process connections change depending on the rate of flow, which is a direct correlation to the size of the engine. By applying even more power, these hulls ride more on top of the water. But in practical it will be around 3.8 to 4.1 unit/Kg of fuel or per unit electricity generation DG will consume 256 to 260 gm of fuel. It is the idle condition of the Diesel Generator Set. IT CAN BE CALCULATED THEORETICALLY & PRACTICALLY:- 1. theoretically--- For this you must know the SFC(specific fuel consumption) of the engine at … One important factor for me when I am looking for a new boat is the fuel economy. For stationary application the equiva-lent term "heat rate" is used, which is normally expressed in kJ/kWh. Weather and sea conditions vary more than road conditions, the time it takes to cover a distance varies more, so fuel consumption is measured in gallons per hour rather than miles per gallon. In order to achieve accuracy, the fuel consumption and power developed is always measured over a suitable time period on a good weather. I have read your superb articles on the zen of QSM-11 engines, and based on the “Propping the Cummins Marine QSM11 to Prevent Exhaust Issues” article, am about to haul my new (to me) boat to have it re … It is an informative blog post on brake specific fuel oil consumption of a marine diesel engine. The marine engine efficiency is usually determined using the SFOC.. So I have decided to create a user-submitted database of boats and their fuel economy. The biggest factor is fuel consumption related to cooling fans and water pumps of various generator sets. Thanks for sharing this with us! Some might argue that if you have to ask you can’t afford it and while that might be true with the cost of marine fuel and the low fuel economy of boating that can add up quickly.. There is an old formula that is near enough for sizing fuel tanks in smaller vessels to, say 60 feet, powered by modern high speed diesels. Many of today’s marine engines have fuel flow readouts. diesel engine’s power at any RPM is controlled by how much fuel is metered into the injectors. Hence specfic fuel consumption will be 4.2units/kg of fuel. 2. Brake Specific Fuel Oil Consumption of a Marine Diesel Engine (SFOC) ... Usually Torque is measured by using the formula . Specific Fuel Oil Consumption (SFOC): Specific fuel oil consumption is the measure of the mass of fuel consumed per unit time to produce per KW. Ship owners would find it useful. or in other words for one unit of electricity generation fuel consumption will be 238 gms. The bow comes down, speed increases, and fuel burn levels off. This engine could produce 380 HP at 2,300 RPM, but since the propeller is only ab-sorbing 250 HP, less fuel is being injected into the cylinders and less fuel means less power—even at the same RPMs. Heat rate versus specific fuel-oil consumption In some industries fuel consumption is typically stated in terms of g/kWh, based upon a standard fuel with a low-er calorific value (LCV) of 42.7 MJ/kg. In this phase the bow rides awkwardly high and fuel economy plummets. Gallons & Liters per hour : MerCruiser Fuel Consumption twin engine - 3.0 - 4.3 - 5.0 - 5.7 - 6.2 - 7.4 - 8.1 - 8.2 - Mercury 496 - 502 0.357 pounds of fuel per hour per horse power. Why do some engines burn more fuel than others at the same load? Additional re-prop questions for QSM11. A typical diesel fuel loop system would on average have 3.5 times more fuel in its line than what the engine consumes at full load. For that reason, a 100kW generator will burn more fuel at 10kW than a 10kW generator set. All boats maximize fuel economy at the slower speeds, but the penalty for higher speeds varies substantially between hull types. Reply Delete. Calculating fuel consumption on a boat is much different than your own car.