If an injector is powered for 15 ms. at 6000 RPM, then the duty cycle is 75% (15 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. Consider : stock 280cc/min injectors at 100% duty cycle with a BSFC of 0.5 can produce a theoretical maximum of ~213-220bhp. 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 The constants used are 160 CFM per 100 HP, and 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. 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. Join in Our Mailing List. Check with your injector builder on where he thinks the maximum duty cycle is for you specific injectors. So: IDC = IPW / (120 / RPM) That can be rewritten as: At 100% duty cycle, the injector would be on constantly. 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 Negative input values are not allowed. The yellow box shows the It is correctly calculated as you are opening the injector for about 25ms at 5000 RPM. You can use the calculator below to determine injector duty cycle when engine speed and injector pulse width are known. Number of injectors (No) maximum duty cycle (%) Fuel Type / Application (BSFC) target horsepower (bhp) cc per min (cc) liters per hour (L) Fuel Pressure Modification. HP at given BSFC (100% duty cycle, 43.5 PSI) The amount of time available between injector pulses is based on engine RPM, or more specifically, on engine cycles. 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 # of Cylinders Fuel Pressure (psi) Injector full flow value (size) The following one is for displacement in CI. Variations such as Natural Aspirated, Turbo or supercharged, or specific type of gasoline, can be used. You can determine what size fuel injectors you will need by entering a few simple details into our calculator. 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 405-217-0701. 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 Note: Calculation is based on fuel pressure of 43.5 psi = 300 kpa = 3 Bar Injector Size *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 If a fuel injector is activated for 15 ms. at 3,000 RPM the duty cycle is 37.5% (15 ms. / 40 ms.). Fuel Injector Size Calculator; BSFC See Notes: Max Duty Cycle in % Required Injector Static Flow Rate @ 43.5 psi: lb/hr. Explanations of each input are below the calculator. Estimate the required 90% of that is ~192-198bhp. Maximum injector duty cycle (IDC) (In order to be conservative, Fuel Injector Clinic recommends a maximum duty cycle of 90%.) *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. If the displacement is in liters then use the following formula. 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. So, your injector is open all the time and this lead to a 100% duty cycle. Product Questions? Want to calculate your injector duty cycle? on time / total time measured = duty cycle. VAF = (CI/1728) x (RPM/2) x VE, where, VE equals the natural capacity (NC) times the overall density ratio (DR). Check with your injector builder on If you are runing over this it's time to look for a larger injector. Want to calculate your injector duty cycle? = (Max. At 5000 RPM, a complete cycle (720) is 24ms. Example : an injector is on for 1ms and off for 9ms. The safe duty cycle is 0.80 for most OE engines and 0.85 for modified and road racing engines. = (Max. cc/min. Here is a simple calculator that will do that. The grey box will Check with your injector builder on Fuel Injection Calculations Use this page to estimate fuel injector size. 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 You can enter numbers in the white boxes. To control the amount of fuel that enters the engine the injectors are turned on and off or pulsed very quickly. 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. You can use the calculator below to determine injector duty cycle when engine speed and injector pulse width are known. HP x In general, duty cycle is the amount of time a device is active during a specified amount of time expressed as a percentage. Typical injector limits for duty cycle is 80-85%. Rather, it pulses the injector on and off. Octane Booster Mixing Calculator. Professional Fuel Injector Pulsewidth Calculator. The inputs are, in order of The next two formulas calculate VAF in CFM. 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. BSFC is the amount of fuel consumed for each horsepower made. If Idle in Kilopascals (kpa): Then kpa / 3.3864 = In Hg. VAF = (L/28.317) x (RPM/2) x VE. Here is a simple calculator that will do that. It works by estimating airflow based on a few known parameters, and then calculating fuel flow directly from exhaust lambda. Note that this is at 100% duty cycle and 43.5 psi; raising the fuel pressure will increase the maximum horsepower. The result is a far more accurate estimation, which allows you to pick the right injector the first time. Here is a simple calculator that will do that. Receive our latest updates Step 4: Calculate Your Optimum Injector Size. FuelTech also offers the option to determine the maximum horsepower rating of fuel injectors by working backwards, using fuel injector sizing and other parameters. Injector Duty Cycle. Expected Peak This calculator will do it for both 2 Stroke and 4 stroke engines. 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 Industry-Leading Technical Support. The longer the pulse, the more fuel the injector sprays. 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. The Injector Dynamics fuel flow calculator is not based on efficiency. You can enter numbers in the white boxes. This calculator will do it for both 2 Stroke and 4 stroke engines. The ratio would be 1/1+9 = 1/10 = 10% duty cycle. : Idle in Inches of Mercury (In Hg.) At 50% duty cycle, the injector is on 50% of the time. = Specific to fuel injectors as stated by Russ Collins: 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. This calculator will do it for both 2 Stroke and 4 stroke engines. This calculator will generate pulsewidth values for specific rpms, from idle to peak speeds. 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. Fuel Injector Calculators. 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. The amount of time an injector is turned on to delivering fuel is known as injector duty cycle. # of Cylinders Fuel Pressure (psi) Injector full flow value (size) in CC/Min Engine Aspiration Duty Cycle Fuel Used 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): 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. Brake Specific Fuel Consumption (.5 for 2 Valve, .45 or less for 4 valve) B.S.F.C. Max. Maximum injector duty cycle (IDC) (In order to be conservative, Fuel Injector Clinic recommends a maximum duty cycle of 90%.)

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