Maximum injector duty cycle (IDC) (In order to be conservative, Fuel Injector Clinic recommends a maximum duty cycle of 90%.) The inputs are, in order of FuelTech also offers the option to determine the maximum horsepower rating of fuel injectors by working backwards, using fuel injector sizing and other parameters. The result is a far more accurate estimation, which allows you to pick the right injector the first time. The amount of time available between injector pulses is based on engine RPM, or more specifically, on engine cycles. Receive our latest updates Check with your injector builder on where he thinks the maximum duty cycle is for you specific injectors. Here is a simple calculator that will do that. Explanations of each input are below the calculator. Fuel Pressure Modification. Specific to fuel injectors as stated by Russ Collins: You can enter numbers in the white boxes. Want to calculate your injector duty cycle? Armed with the information from steps one through three above, you can now calculate the optimum fuel injector size using the following formula: injector size in lbs./hr. Step 4: Calculate Your Optimum Injector Size. So, your injector is open all the time and this lead to a 100% duty cycle. Consider : stock 280cc/min injectors at 100% duty cycle with a BSFC of 0.5 can produce a theoretical maximum of ~213-220bhp. Your Installed Injector size (lb/hr): Number of injections per cycle (batch 2, sequential 1): How many strokes per cycle (four stroke = 4): Results Injector Size @ 80% recommended duty cycle (lb/hr): Max Hp with recommended injectors @ 85% duty cycle: Max Pulse Width Permitted @ 85% duty at peak rpm: (Ms): cc/min. Here are the basic formulas for how total ignition advance is calculated: Total Ignition Timing (all 2.5L): Primary Ignition + (Dynamic Advance * DAM) + Feedback Knock Correction + Fine Knock Learning + Compensations 90% of that is ~192-198bhp. If you are runing over this it's time to look for a larger injector. Rather, it pulses the injector on and off. Part 1 Part 1 of 2: Using a Fuel Injector Cleaning KitPurchase a fuel injector cleaner kit with a PEA cleaning fluid. Look for a cleaning kit that is suitable for your type of vehicle.Review your vehicle's engine layout to locate the fuel injectors. Different types of engines have different layouts, so your fuel injectors may be difficult to find.Disconnect the fuel pump from the fuel injectors. More items You can enter numbers in the white boxes. So: IDC = IPW / (120 / RPM) That can be rewritten as: You can use the calculator below to determine injector duty cycle when engine speed and injector pulse width are known. Here is a simple calculator that will do that. This calculator will do it for both 2 Stroke and 4 stroke engines. While fuel injector cleaners have been in the market for decades, we couldnt find any published study by a scientific research institute. However, its safe to say that the fuel system cleaner does actually work. But, only if used correctly. If the deposit buildup is too much then sure, regular pour-in injector cleaner solvents wont be effective. At 5000 RPM, a complete cycle (720) is 24ms. Maximum injector duty cycle (IDC) (In order to be conservative, Fuel Injector Clinic recommends a maximum duty cycle of 90%.) Industry-Leading Technical Support. The Injector Dynamics fuel flow calculator is not based on efficiency. Professional Fuel Injector Pulsewidth Calculator. Variations such as Natural Aspirated, Turbo or supercharged, or specific type of gasoline, can be used. Estimate the required Note: Calculation is based on fuel pressure of 43.5 psi = 300 kpa = 3 Bar Injector Size HP x Note that this is at 100% duty cycle and 43.5 psi; raising the fuel pressure will increase the maximum horsepower. = The following one is for displacement in CI. Armed with the information from steps one through three above, you can now calculate the optimum fuel injector size using the following formula: injector size in lbs./hr. This calculator will generate pulsewidth values for specific rpms, from idle to peak speeds. You can use the calculator below to determine injector duty cycle when engine speed and injector pulse width are known. *The formula for this is : lb/hr per injector / .90 (90%, .8 is 80%, etc etc) = injector size needed to flow that fuel amount with a 90% duty cycle. : Idle in Inches of Mercury (In Hg.) The ratio would be 1/1+9 = 1/10 = 10% duty cycle. To calculate the minimum injector size each of our engines will need, its as simple as taking our total pounds per hour fuel requirement from above and divide that value by the *EX: If we use our 56.67, it would look like this to calculate what size injector we need if we wanted it to flow that at 90% duty cycle : 56.67 / .90 = 62.97lb/hr Join in Our Mailing List. RPM / 60 = revs per second RPM / 120 = cycles per second (by cycle I mean four strokes) 120 / RPM = seconds per cycle = maximum time available for injectors to squirt Fuel injector duty cycle is the actual time the injector is open, divided by the total time available. Armed with the information from steps one through three above, you can now calculate the optimum fuel injector size using the following formula: injector size in lbs./hr. Typical injector limits for duty cycle is 80-85%. VAF = (CI/1728) x (RPM/2) x VE, where, VE equals the natural capacity (NC) times the overall density ratio (DR). It is correctly calculated as you are opening the injector for about 25ms at 5000 RPM. Actual injector pulse width time / total cycle time duration available at those RPM = Injectors Duty cycle % Example: 6000 RPM, actual injector pulse width is 15 ms. 6000 RPM / 2 ( Otto cycle engine) = 3000 cycles per minute 3000 cycles per minute / 60 seconds = 50 cycles per second 1 second / 50 cycles = 20 ms total time available for each cycle. = (Max. The yellow box shows the You can determine what size fuel injectors you will need by entering a few simple details into our calculator. Using a BSFC of 0.5 and a max duty cycle of 100%, your 38 lb/hr injectors should be delivering about 600 crank HP in fuel. Want to calculate your injector duty cycle? If Idle in Kilopascals (kpa): Then kpa / 3.3864 = In Hg. Check with your injector builder on VAF = (L/28.317) x (RPM/2) x VE. At 100% duty cycle, the injector would be on constantly. Here is a simple calculator that will do that. BSFC is the amount of fuel consumed for each horsepower made. It works by estimating airflow based on a few known parameters, and then calculating fuel flow directly from exhaust lambda. These additives will restore the lubricants missing from modern ultra low sulfur diesel and prolong the life of your injectors. While there is addition cost, some of these additives will boost the cetane rating of your fuel and pay for themselves with improved fuel mileage and performance. Fuel Injection Calculations Use this page to estimate fuel injector size. The grey box will If an injector is powered for 15 ms. at 6000 RPM, then the duty cycle is 75% (15 = (Max. The amount of time an injector is turned on to delivering fuel is known as injector duty cycle. At 50% duty cycle, the injector is on 50% of the time. # of Cylinders Fuel Pressure (psi) Injector full flow value (size) Brake Specific Fuel Consumption (.5 for 2 Valve, .45 or less for 4 valve) B.S.F.C. This calculator will do it for both 2 Stroke and 4 stroke engines. Product Questions? Number of injectors (No) maximum duty cycle (%) Fuel Type / Application (BSFC) target horsepower (bhp) cc per min (cc) liters per hour (L) If the displacement is in liters then use the following formula. Example : an injector is on for 1ms and off for 9ms. This is measured as a percent, so 50% duty cycle indicates that the injector is held open and held closed for an equal amount of time. In general, duty cycle is the amount of time a device is active during a specified amount of time expressed as a percentage. This calculator provides the required injector sizing in cc/min for your engine combination as well as the total flow in liters per hour for pump sizing. # of Cylinders Fuel Pressure (psi) Injector full flow value (size) in CC/Min Engine Aspiration Duty Cycle Fuel Used Injector size = (600 HP) x (0.57 BSFC) = 47.5 lb/hr (8 injectors) x (0.9) The following chart provides maximum horsepower levels based on injector size and various BSFC values. HP at given BSFC (100% duty cycle, 43.5 PSI) Check with your injector builder on The constants used are 160 CFM per 100 HP, and The calculation for duty cycle is very simple; it's just the pulse width divided by the period, which gives the percentage of time that the coil is being energized, compared to the Now that we know the IPW, we can calculate our IDC in a much simpler formula: IPW = injector pulse width in milliseconds (ms) RPM = engine speed in rotations per minute Octane Booster Mixing Calculator. The next two formulas calculate VAF in CFM. If a fuel injector is activated for 15 ms. at 3,000 RPM the duty cycle is 37.5% (15 ms. / 40 ms.). The safe duty cycle is 0.80 for most OE engines and 0.85 for modified and road racing engines. on time / total time measured = duty cycle. Fuel Injector Calculator Crankshaft Horsepower (BHP): Number of Injectors: Brake Specific Fuel Consumption Desired: .45 to .50 for N/A Engines, .55 TO .60 for Supercharged engines, .60 to RF Pulse Train DUTY CYCLE Duty cycle (or duty fact or) is a measure of the fraction of the time a radar is transmitting. It is important because it relates to peak and average power in the determination of total e nergy output. This, in turn, ultimately effects the strength Negative input values are not allowed. Fuel Injector Size Calculator; BSFC See Notes: Max Duty Cycle in % Required Injector Static Flow Rate @ 43.5 psi: lb/hr. This calculator will do it for both 2 Stroke and 4 stroke engines. Injector Duty Cycle. To control the amount of fuel that enters the engine the injectors are turned on and off or pulsed very quickly. Expected Peak Fuel Injector Calculators. The longer the pulse, the more fuel the injector sprays. Max. 405-217-0701. 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