These engines are far too expensive to test and risk without being absolutely sure of the actual values that keep the engine safe at all times. You can also figure out how much real HP any engine is making. Same can be said about cars that have real engines with real horsepower. Switch the formula around if the GPH is known to calculate the HP that could be made. Fuel flow (GPH) = 0.0226 x HP / TE . To start the calculations for fuel consumption we use the. Likewise, a well-maintained diesel engine burns about 0.40 pounds of fuel per hour per horsepower. Your email address will not be published. You can calculate how much fuel you will need to produce a certain amount of HP with these calculations. The above BSFC number tell us that our gasoline engine requires .50 lb of fuel per horsepower per hour. Also, remember that engines with direct and electronic fuel injection will yield higher fuel efficiency. When planning your fuel delivery system we recommend first starting with an estimate of the fuel consumption your engine will require. These are rough estimates of your fuel consumption and you should always refer to your engine’s manufacturer for more accurate fuel consumption. You need to know the fuel flow the engine consumes to calculate the thermal efficiency. This filter features OEM style Ford fuel fittings specifically found on the 4.6 modular motor Mustangs. Again we calculate Fuel Consumption for a 400 hp Gas engine. Listed below are the BSFC ranges for average efficiency Gas, E85 & Methanol engines at their peak hp output. We see some DI engines running very lean but not at full power. Between Imp. Fuel makes power. Keep in mind that these formulas apply when the engine is making peak rated horsepower, which usually is at wide-open throttle (WOT). You can used these BSFC values to calculate the fuel requirements for various horsepower levels. There is a saying that money talks and BS walks. You want to be sure that your components can deliverer the fuel needed to supply your thirsty engine. This is measure fuel flow by HP observed and expressed in Lbs/ hr/ HP. An engine's BSFC can vary depending on load and RPM, these rates aim to represent the peak horsepower environment. Heat energy is measured in BTU’s. On a turbo engine we may increase this upwards to 0.47- 0.52 BSFC, and that would be approx 0.82 – 0.79 lambda. This would calculate out to be around 0.85 – 0.87 lambda. Expressed as a formula it looks like this: Given Horsepower x .50 lb fuel/hp = lbs of fuel for given horsepower. Compare that to the long length of stock 3/8 fuel line running to and from the filter. Let’s plug in another more realistic BSFC number of 0.44 and use 300HP as the power figure and see what the GPH would be. by converting the BSFC you prefer for your fuel from the normal lbs/hp/hr unit of measure to a gal/hp/hr measure. gph unit? We are occasionally asked, what fuel flow do I need to support my application? Plug the given fuel flow and HP numbers into the BSFC formula and see what that number is. 400 hp x .0800 = 32 gph Remember, if you are running E85 or Methanol be sure to use those BSFC values in your formula as well as the appropriate lb/gal conversion value for your chosen fuel.. To calculate peak fuel consumption for an 800 hp E-85 engine we can use a BSFC of .70 and a lb/gal of 6.59. This way you will only need to multiply your horsepower by that figure to arrive at your GPH rate, without the need for converting from lbs to gallons after. If you take the engine example discussed earlier, and plug in the values to the BSFC formula you get. The long length and twist and turns in the fuel line mean resistance to flow is much greater. Performance Developments - 1643 Monrovia Ave. Costa Mesa CA 92627 - Tel: (949) 646-7461 Fax: (949) 646-7471 |, Porsche 996 and 997 Turbo Cylinder Head Sealing, 996 and 997 Turbo Crankshafts and Rod Bearings, Replacement CDI Ignition for Porsche 911 Carrera and Turbo Engines, Porsche 944-968 Engine Block Lower Member Upgrade, Porsche 911 Type Air-Cooled Cylinder Head Rebuilding. Constants | Gas | Diesel Or if we use the 24 GPH and a BSFC of 0.44 what a horsepower figure could be. In this application the stock line would not be able to flow much more then 60 GPH without significant pressure flow restriction accumulating. 1 Gallon of fuel weighs approx 5.92 lbs and for every 1 lb of fuel burned approx 19,000 BTU’s of energy is released. This can be calculated by the following. Calculating fuel consumption on a boat is much different than your own car. Our filter tests showed that in stock based applications with OE fittings and. Subscribe to The Canton Blog for ongoing access to: How to Estimate Your Engine's Required Fuel Flow. For any engine you can calculate the amount of fuel used, its thermal efficiency and its horsepower potential. To start the calculations for fuel consumption we use the BSFC (Brake-Specific Fuel Consumption) for the fuel being used. The long length and twist and turns in the fuel line mean resistance to flow is much greater. On average, a four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour per horsepower. It can be argued that the engine relies upon these inputs when it is running. Listed below are the BSFC ranges for average efficiency Gas, E85 & Methanol engines at their peak hp output. Another way we measure this is on an engine dyno we calculate Brake Specific Fuel Consumption BSFC. Unfortunately, many engines are tested and mapped relying upon the AFR/Lambda numbers and the knock values recorded by the factory ECU. 800 hp x .70 = 560 lbs/hr 560 lbs/hr / 6.59 lbs/gal = 84.98 gph, BSFC .70 / 6.59 = .106 gallons / horsepower / hour. Then determine the line size and pump to support that flow. BSFC .50 / 6.25 = .0800 gallons / horsepower / hour. This too can give an indication of the engines performance output. Our filter tests showed that in stock based applications with OE fittings and fuel lines in the 3/8 range the fitting and line size was the determining factor for flow. This tool converts gallons per minute to liters per minute (gal/m to lt/m) and vice versa. Keep in mind that these formulas apply when the engine is making peak rated horsepower, which usually is at wide-open throttle (WOT). GPH = (0.50 x 300)/ 6.2 = 150/6.2 = 21.8 GPH. To apply these formulas to your boat, just plug in its horsepower rating and multiply it by the specific fuel consumption average, then divide the product by the fuel specific weight. Required fields are marked *, You may use these HTML tags and attributes:
. Many of today’s marine engines have fuel flow readouts. Those that are doing it right will be. You can calculate how much fuel you will need to produce a certain amount of HP with these calculations. Regardless of what someone may tell you, most engines make in the region of 30% TE. Fuel consumption calculator - MerCruiser - Cummins MerCruiser - Crusader - Volvo Penta Diesel - Mercury - Evinrude - Honda Marine - Yamaha Marine - Suzuki Marine - Tohatsu - Johnson - Outboards | GPH MPG LPH KPL Let’s look at the mathematical calculation below for an explanation. Gasoline .45 - .50E85 .63 - .70Methanol .90 - 1.0. The unit of measure here is lbs / hp / hr. Liters per minute to Liters per hour (LPM to LPH) conversion calculator of Flow measurement, 1 liter per minute = 60 liters per hour.
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