How to calculate horsepower from cc

Converting CC to HP To determine the approximate horsepower (HP) for a conventional combustion engine based on its cubic centimeters (CC), you can use the given formula: HP = CC ÷ 15. In this formula: HP stands for horsepower. CC represents the engine’s cubic centimeters. Simply, to compute the horsepower from the engine’s CC, divide the ...

Oct 20, 2019 ... HOW TO CALCULATE CC OF A ENGINE. 18K views ... From Novice to Pro - Learn How to Calculate Engine CC, Like a Boss ! ... Cc और hp में क्या फर्क ...V = π/4 x (D)² x H x N. Where: V: Cylinder Volume or CC. π: 3.14. D: Bore’s Diameter. H: Stroke’s Length. N: Number of Cylinders. You can usually find the …To calculate the horsepower of an electric motor, you'll use a slightly different formula. Look at the manufacturer's information to find the voltage (V), current in amps (I), and efficiency (Eff) of the motor. Then, use the formula (V x I x Eff)/746 to find the horsepower. For example, a motor with a voltage of 240, a current of 100 amps ...Formula: V = π/4 x (D)² x H x N. Where: V: Cylinder Volume or cc. π: 3.142. D: Bore’s Diameter. H: Stroke’s Length. N: Number of Cylinders. Why is cc important? …724 cc is approximately equal to 48.27 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.This cc is used to calculate. horse power (hp). Cylinder formula. 3.14159 * (radius*radius) * length. Horsepower will vary. somewhat due to compression. differences and engine. physical construction.How to calculate hp to CC? Free online HP to CC calculator. Simply enter the engine displacement in HP or CC and get results instantly- formula use:- CC = HP * 15. A hp to cc calculator is a tool that can be used to estimate the engine displacement (in cubic centimeters or cc) of an internal combustion engine based on its horsepower (hp) output.One horsepower is equivalent to the amount of force needed to lift 550 lbs of weight within a period of 1 second. One horsepower is equal to 745.7 watts, watts being a unit of power that James Watt also came up with, and the same unit you see everyday associated with things like light bulbs and electrical devices.

679 cc is approximately equal to 45.27 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.708 cc is approximately equal to 47.2 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.This cc is used to calculate. horse power (hp). Cylinder formula. 3.14159 * (radius*radius) * length. Horsepower will vary. somewhat due to compression. differences and engine. physical construction.Calculated Form CC TO HP. Enter The CC. HP Result. Formula to convert 270 CC to HP horsepower Divide your vehicle engine's capacity by 15. HP = CC/ 15. HP= horsepower. cc=Cubic Centimeters. for this 270 CC exemple HP= 270 /15 = 18. 270 cc= 18 HP.Simply enter the engine displacement in HP or CC and get results instantly- formula use:- CC = HP * 15.A hp to cc calculator is a tool that can be used to estimate the engine displacement (in cubic centimeters or cc) of an internal combustion engine based on its horsepower (hp) output.you can use a general approximationCC = HP *15HP ...

500cc Motorcycles: The 500cc class tends to get up to 45 to 60 HP. Many of them still come with the standard 2-cylinder 4-stroke engine, so the difference isn’t exactly night and day. However, you can find some 500cc motorcycles with 2-stroke engines for as much as 150 to 200 HP.This calculator will help you estimate the potential of an engine. Roll your pointer to the left of the table to see typical values. There are tooltips over each input to tell you which values are affected by this input. For the theory behind the calculator see the engine page. Atmospheric air conditions: pressure * :Suppose an engine produces a torque of 250 lb-ft (340 Nm) and operates at 5000 RPM. Using the formula, we can determine the horsepower: Horsepower = (250 lb-ft x 5000 RPM) / 5252 = 238.68 hp. By applying this formula, you can calculate the horsepower output of various engines or motorized systems accurately.Calculated Form CC TO HP. Enter The CC. HP Result. Formula to convert 161 CC to HP horsepower Divide your vehicle engine's capacity by 15. HP = CC/ 15. HP= horsepower. cc=Cubic Centimeters. for this 161 CC exemple HP= 161 /15 = 10.73. 161 cc= 10.73 HP.Because a four-cycle engine with 32.2 cc will produce one horsepower, experts devised the following formula: cc 32.2 = hp; For example, a small, four-cycle engine with 200 cc can produce around 6.21 hp. For Other Engine Types. Because so many factors can affect horsepower, there’s no sure way to convert cc to hp.

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Calculate Horsepower with the RPM & Torque Method. It is possible to calculate the horsepower of an engine using the RPM and torque method. While horsepower can be defined as the sheer power output of the engine, torque is defined as the amount of twisting force that is created by the engine.. Engine horsepower typically peaks at a specific …The simple formula is horsepower times BSFC – or 500 horsepower x 0.5 = 250 lbs/hr of fuel. This is the amount of fuel we need to supply to the engine to achieve 500 hp. If we divide that volume by eight injectors (for a V8 engine), this comes to 31.25 lbs/hr necessary to feed the engine.This formula is commonly used in the automotive industry to calculate the horsepower of a vehicle’s engine based on its torque and rotational speed. How is Horsepower Calculated? Understanding the Equation: Horsepower, a measure of engine power, can be calculated precisely using the formula: Horsepower (HP) = (Torque x RPM) / 5252.To convert from CC to horsepower ( 200 CC TO HP) or vice versa. Type the amount below you want to transfer, then click the Transfer button in The calculator. Formula to convert 200 CC to HP horsepower Divide your vehicle engine’s capacity by 15.Wheel HP = Crank HP * (1 - Drivetrain Loss Percentage) By assuming a drivetrain loss of 15%, the formula becomes: Wheel HP = Crank HP * 0.85. This calculator is designed to be user-friendly and interactive. The user inputs the crank HP, and the calculator applies the formula to estimate the wheel HP. The result is displayed in a read-only field.

Step 4. Calculate the horsepower or CC by multiplying or dividing by 15. The general rule is for every 15 CC there is 1 HP. For example, for a 150 CC engine you would take 150 divided by 15, which equals 10 HP. The metric and English units of measurement have quite a bit of difference, but you may need to convert both measurements in order to ...Given torque in any unit, and speed in rpm, calculate power in watts or hp. Select language and country: ...Method 1. Firstly, divide the CC of the engine by 15. For example, the engine is noted to be 1.8 - liter or 1800 CC in equal. Taking 1800 CC divides for 15 yields 120 HP. Secondly, divide the CC of the engine by 17. For example, the same 1.8 - liter engine or 1800 CC in equal, taking 1800 divides for 17 yields 106.Horsepower tells how much work an engine can perform in time. The equation involves two essential components: torque and RPM. The twisting force of an engine is known as torque and is like when you twist the lid off a jar. Increased torque signifies the superiority of an engine. RPM is how quickly the engine is spinning.CC Definition. A cubic centimeter (CC) measures engine displacement volume in cubic centimeters. It is a critical factor in engine design, influencing power output and fuel efficiency. CC to HP Formula. The formula to convert CC to HP is remarkably simple: \[ HP = \frac{CC}{15} \] Where: HP is the horsepower; CC is the cubic …Step 1: Pick What To Convert. Step 2: Enter The CCs. Result: The calculator will give you the average ratio between horsepower and engine size but there are several other factors that contribute to the …This calculator will allow you to calculate injector size based on power requirement. You can select between horsepower (HP) or kilowatt (KW). It will also allow the input of various fuels such as gasoline, E85, E98 and Methanol.285 cc is approximately equal to 19 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.750 cc is approximately equal to 50 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.For example, let’s find the recommended carburetor size for an engine with a displacement of 302 cubic inches, a max speed of 7,500 RPM, and 80% volumetric efficiency. carburetor size = 302 × 7,500 × .8 ÷ 3,456. carburetor size = 524.31 CFM. Because carburetors typically come with CFM ratings that are rounded off to the nearest 50 or 100 ...Below is a list of three cars, we look at the RPM of the peak VE and see how much tuning potential these engines have (without increasing engine stress) Honda S2000, 2004: 237bhp at 8,300 rpm = 99% VE. Nissan Micra 1.2, 2009: 79bhp at 4000rpm = 110% VE. Ford Focus ST, 2014: 286bhp @ 5500 rpm = 180% VE.HP Result. Formula to convert 389 CC to HP horsepower Divide your vehicle engine’s capacity by 15. HP = CC/ 15. HP= horsepower. cc=Cubic Centimeters. for this 389 CC exemple HP= 389 /15 = 25.93. 389 cc= 25.93 HP.

Calculated Form CC TO HP. Enter The CC. HP Result. Formula to convert 636 CC to HP horsepower Divide your vehicle engine's capacity by 15. HP = CC/ 15. HP= horsepower. cc=Cubic Centimeters. for this 636 CC exemple HP= 636 /15 = 42.4. 636 cc= 42.4 HP.

My process was to convert RPM at the engine to RPM at the wheels (assuming no wheel slip and 100% efficiency of drive line). then converted RPM @wheels to m/s. then with constant acceleration assumption, the force to move the car is m * a and then converted the Newtons to power in watts then watts to HP (1 W = 745.7 HP).Jeff Smith, former editor of Car Craft and Hot Rod Magazines, takes us through his secret horsepower prediction formula that allows you to estimate engine po...725 cc is approximately equal to 48.33 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.Cc is used as the measure of displacement, whereas horsepower is the work measurement. The cc of an engine is constant, while the engine's horsepower is variable. The cc indicates the engine's capacity, while horsepower is the power measurement unit. Cc is measured in cubic centimetres while horsepower is measured in Kilowatt.Press ENTER or = to solve the equation. 2. Take the power of a number. In most cases, you'll do this by entering the first number, pressing the carrot ( ^) button, and entering the number to which you want to raise the first number. For example, to calculate 2 2, you would type in 2^2 and then press ENTER or =.Here are the steps: Determine the engine's displacement in cubic centimeters (CC). You can usually find this information in your vehicle's user manual or by checking the engine specifications online. Input the CC value into the calculator. The calculator will then estimate the engine's horsepower (HP) using the formula CC ≈ HP x 15.Horsepower Calculator. Choose to calculate. horsepower or torque. Horse. Power. Torque. (ft·lbs) Enter the following values. to calculate horsepower.First, determine the total engine size in cubic centimeters. For this example, the engine size is found to be 750CC's. Next, use the formula above to convert this value to horsepower. HP = CC/ 15 = 750 / 15 = 50 horsepower. Example #2: For this example, we will convert HP to CC. The horsepower in the problem is provided as 40 HP.CC = Cubic centimeters; How to Calculate CC to HP. Example:- if your car engine displacement is 2000 cc then find power in hp. HP = CC / 15. Horsepower = 2000 / 15 = 133.333 hp. The car engine power is 133.33 HP. CC to HP Table. Approximate constant value 15 to divide in cc for calculating hp. Centimeters Horsepower; 100 cc: 6.66667 HP: 110 cc:

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Because a four-cycle engine with 32.2 cc will produce one horsepower, experts devised the following formula: cc 32.2 = hp; For example, a small, four-cycle engine with 200 cc can produce around 6.21 hp. For Other Engine Types. Because so many factors can affect horsepower, there’s no sure way to convert cc to hp.125 cc is approximately equal to 8.33 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.Simply divide the horsepower by the clearing width to get the horsepower per inch ratio. You want a minimum of 0.3 horsepower per inch. So scenario one, you have a 5-horsepower snow blower with a 20-inch clearing width: 5 ÷ 20 = 0.25 horsepower per inch. That is a fairly weak ratio.The heart of the CC Converter HP Calculator lies in its formula: HP = (CC × (RPM ÷ 1000)) ÷ 22.13. Where: HP: Horsepower, the measure of an engine’s power output. CC: Engine displacement in cubic centimeters. RPM: Engine speed in revolutions per minute. 22.13: A constant factor crucial for the conversion formula.Compression Calculator. Get accurate compression without the guesswork! Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you're on your way to maximum performance. Use (-) for Dome and (+) for Dish.Horsepower Calculator. Choose to calculate. horsepower or torque. Horse. Power. Torque. (ft·lbs) Enter the following values. to calculate horsepower.The BASE* fuel pressure you will run (your fuel pressure at idle), *our calculator assumes a 1:1 rising rate fuel pressure regulator for turbo applications Injector flow size - make sure you select cc/min or lb/hr in the drop down, (The amount of fuel you can supply your engine directly affects the amount of power that engine is capable of ...306 cc is approximately equal to 20.4 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.To calculate the approximate HP of an engine based on its CC, you can use the following formula: CC ≈ HP x 15. This formula provides an estimate of the horsepower based on …Welcome to our video tutorial on calculating engine CC! Whether you're a car enthusiast or a mechanic, understanding how to calculate engine CC is an essenti... ….

Study the formula to convert horsepower between RPM. Work is equal to the torque multiplied by the time. The equation is therefore: \text {power}=\tau\times\frac {\text {RPM}} {5252} power = τ × 5252RPM. The constant 5252 is a result of converting RPM to radians per second, and of using the definition of horsepower.127 cc is approximately equal to 8.47 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.285 cc is approximately equal to 19 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.Monthly interest payment = 0.00041 × 450 × 30 = $5.54. Jon's interest payment for the month of June is $5.54. There are several other ways in which credit card issuers calculate the monthly interest payment, including the previous balance method and the adjusted balance method, though they aren't used all that often.How to Calculate CC to HP. Example:- if your car engine displacement is 2000 cc then find power in hp. HP = CC / 15. Horsepower = 2000 / 15 = 133.333 hp. The car engine power is 133.33 HP.Many people have asked for a relationship between horsepower and cc or how many cc in a hp. The short answer is about 14 to 17cc = 1 hp or about 1 cu.in. = 1 bhp for an ordinary, basic car. The full answer is complex - the power output of an engine depends on the state of tune as well as size, and the definition of horsepower must be considered, brake horsepower ( bhp ) or shaft horsepower ...656 cc is approximately equal to 43.73 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.344 cc is approximately equal to 22.93 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio.What is Horse Power? The power, in simple terms, is ' rate or speed of doing work '. The work is defined as a ' force operating thru' a distance '. The automotive engines use the term ' horse power' (hp) to measure its power. This term comes from the erstwhile practice of measuring the rate of work done by a horse which equals to 33,000 ft-lb of ' work done' per minute.140 cc is approximately equal to 9.33 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio. How to calculate horsepower from cc, 144 cc is approximately equal to 9.6 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., HP = CC ÷ 15. In this formula: HP stands for horsepower. CC represents the engine’s cubic centimeters. Simply, to compute the horsepower from the engine’s CC, divide the value …, Fluid Motor Torque from GPM, PSI and RPM. Gallons per Minute (GPM) Motor PSI. Motor RPM. Torque. inch pounds. Example: How much torque does a motor develop at 1,200 psi, 1500 rpm, with 10 gpm input? Formula: GPM x PSI x 36.77 ÷ RPM = torque in inch pounds. This company assumes no liability for errors in data nor in safe and/or satisfactory ..., Feb 23, 2024 · The heart of the CC Converter HP Calculator lies in its formula: HP = (CC × (RPM ÷ 1000)) ÷ 22.13. Where: HP: Horsepower, the measure of an engine’s power output. CC: Engine displacement in cubic centimeters. RPM: Engine speed in revolutions per minute. 22.13: A constant factor crucial for the conversion formula. , The following formula is used to calculate the torque from horsepower. T = HP / (RPM / 5252) T = H P /(RPM /5252) Where T is the torque (pound-feet) HP is the horsepower. RPM is the rotations per minute. To calculate torque from HP, divide the horsepower by the value of the RPM divided by 5252., One horsepower is equivalent to the amount of force needed to lift 550 lbs of weight within a period of 1 second. One horsepower is equal to 745.7 watts, watts being a unit of power that James Watt also came up with, and the same unit you see everyday associated with things like light bulbs and electrical devices., By default, you own every picture you take on Instagram, but once photos are on the service, they're kind of stuck there. If you want to licence your photos so anyone on the web ca..., The calculator above uses the computational method. This approach calculates the "factor" for your boat that is spelled out in the rules. The factor is simply the length multiplied by the width of your boat. Based on this value, you lookup the maximum horsepower in a table. If you have a flat bottom boat, you'll need to downsize the ..., 679 cc is approximately equal to 45.27 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., To convert from CC to horsepower ( 1200 CC TO HP) or vice versa. Type the amount below you want to transfer, then click the Transfer button in The calculator. Formula to convert 1200 CC to HP horsepower Divide your …, Converting cubic centimeters (CC) to horsepower (HP) is a useful calculation in automotive and mechanical engineering to understand the power output of an engine. This conversion helps bridge the gap between engine displacement (CC) and engine power output (HP), offering a straightforward way to estimate the potential performance of an engine., You can calculate the horsepower of an engine using several methods. Some common methods include the elapsed time method, the trap speed method, and the RPM and …, On pump gas, Kaase's 429-based 521ci stroker mule engine with a single four-barrel carb on pump-gas regularly makes 730 lb-ft at peak torque. That, friends, is 1.40 lb-ft of torque per cubic inch. Plus, this monster makes over 910 hp at 7,000, losing only 7-percent between peak torque and peak horsepower., 252 cc is approximately equal to 16.8 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., The formula to calculate horsepower (HP) from cubic centimeters (CC) is straightforward: HP = CC / 15. This formula assumes a general conversion factor of 15 CC per 1 HP. Usage Instructions. Enter the CC value in the input field. Click the "Calculate HP" button. The calculated horsepower (HP) will be displayed below the button. Conclusion, The 1976 Moto Guzzi V1000 Convert motorcycle performed as if it had an automatic transmission. See pictures and learn about this big Moto Guzzi. Advertisement The 1976 Moto Guzzi V..., Calculated Form CC TO HP. Enter The CC. HP Result. Formula to convert 760 CC to HP horsepower Divide your vehicle engine's capacity by 15. HP = CC/ 15. HP= horsepower. cc=Cubic Centimeters. for this 760 CC exemple HP= 760 /15 = 50.67. 760 cc= 50.67 HP., Formula. The formula for converting CC to HP is a simple and widely used equation in the world of engines. It can be expressed as: HP = CC / 15. Where: HP represents the horsepower of the engine. CC stands for cubic centimeters, which denotes the engine’s displacement., The formula to calculate horsepower (HP) from cubic centimeters (CC) is straightforward: HP = CC / 15. This formula assumes a general conversion factor of 15 CC per 1 HP. Usage Instructions. Enter the CC value in the input field. Click the "Calculate HP" button. The calculated horsepower (HP) will be displayed below the button. Conclusion, Divide the CC value by 15 to get the first part of the equation. Add 17.5 to the result of the previous step to get the approximate horsepower. For example, let’s assume you have a vehicle with a 2000 CC engine displacement. Using the formula, the calculation would be as follows: HP = (2000 / 15) + 17.5., 150 cc is approximately equal to 10 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., 49 cc is approximately equal to 3.27 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., Use the following formula to calculate the proper flow rate for your injectors. injector flow rate = horsepower × BSFC # cylinders × safe duty cycle. To find the ideal flow rate, simply plug in the values found in steps one, two, and three into the formula and solve. The result is the flow rate in lb/hr., Engine horsepower is a crucial metric used to measure the power output of an engine. It determines the engine’s ability to perform work, such as propelling a vehicle or operating machinery. Calculating engine horsepower involves various factors, including torque and engine speed. Torque is the rotational force produced by the engine, while ..., Wheel HP = Crank HP * (1 - Drivetrain Loss Percentage) By assuming a drivetrain loss of 15%, the formula becomes: Wheel HP = Crank HP * 0.85. This calculator is designed to be user-friendly and interactive. The user inputs the crank HP, and the calculator applies the formula to estimate the wheel HP. The result is displayed in a read-only field., Take the bore (width of the cylinders) Multiply by the stroke (piston travel distance) Multiply by the number of cylinders. That gives you the total volume in cubic inches. Then to convert to CC, just multiply by 16.387 since 1 cubic inch equals 16.387 CC. So for example, say we have a V8 engine with: 4 inch bore. 3 inch stroke., Let's consider an example to illustrate the Brake Horsepower calculation. Suppose a car's engine generates a torque of 300 lb-ft and operates at 5000 RPM. Applying the formula, we have: BHP = (300 * 5000) / 5252 = 285.89 BHP. In this example, the engine produces an estimated Brake Horsepower of approximately 285.89 BHP., The formula to convert cubic centimeters to cubic inches is cc x0.0610237. That means that the 5cc piston volume converts to 0.305, andthe 70cc combustion chamber converts to 4.272 cubic inches., Our first step is to determine the volume of the cylinder based on bore and stroke. If you recall from high school geometry, Volume of Cylinder = Pi x radius squared x height (in this case, stroke). With a 77mm bore and a 53.6mm stroke, this creates a cylinder with a volume of 249cc's. This is just the cylinder itself., 218 cc is approximately equal to 14.53 horsepower, according to the general rule that every 5-6 cc generates 1 HP for hypercars and high-performance powersport vehicles . However, the exact hp value can vary depending on multiple factors, such as the engine type, stroke, aspiration, and compression ratio., Horsepower = (3,000 x 6) / 63,025 = 0.286. 63,025 is a constant when using RPM for speed and in-lbf for torque units. 5,252 is another common constant if the speed is in RPM and torque is in ft-lbf. If the units are different then simply make the unit conversion. The derivation of these constants is done using the 33,000 ft-lbf /min = 1 horsepower., The quickest method to closely estimate motor horsepower is to use a digital clamp meter to measure current and voltage to the motor, and then perform a simple calculation. Use this formula to estimate motor horsepower. Horsepower (hp)= Voltage x Amperage x % EFF x power factor x 1.73/746., displacement = π 4 × 3.4″2 × 3.6″ × 8. displacement = 0.78539816339 × 11.56 × 3.6 × 8. displacement = 261.48 cu in. Engine displacement can be measured in liters, cubic centimeters, or cubic inches. If the bore and stroke measurements are in inches, then the result from the formula above will be in cubic inches.