Bore Stroke Horsepower Calculator

Bore Stroke Horsepower Formula:

\[ HP_{bs} = \frac{Disp_{bs} \times RPM_{bs} \times BMEP}{792000} \]

Displacement (Disp_bs):

cubic inches

Revolutions Per Minute (RPM_bs):

RPM

Brake Mean Effective Pressure (BMEP):

psi

Calculated Horsepower (HP_bs_calc):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Bore Stroke Horsepower Formula?

The Bore Stroke Horsepower Formula calculates engine horsepower based on displacement, revolutions per minute, and brake mean effective pressure. It provides a theoretical estimation of engine power output based on fundamental engine parameters.

2. How Does the Calculator Work?

The calculator uses the bore stroke horsepower formula:

\[ HP_{bs} = \frac{Disp_{bs} \times RPM_{bs} \times BMEP}{792000} \]

Where:

\( HP_{bs} \) — Calculated horsepower
\( Disp_{bs} \) — Engine displacement in cubic inches
\( RPM_{bs} \) — Engine revolutions per minute
\( BMEP \) — Brake mean effective pressure in psi

Explanation: The formula calculates theoretical horsepower by multiplying displacement, RPM, and BMEP, then dividing by the constant 792000 to convert to horsepower units.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation is crucial for engine design, performance analysis, and comparing different engine configurations. It helps engineers optimize engine parameters for specific performance requirements.

4. Using the Calculator

Tips: Enter displacement in cubic inches, RPM as revolutions per minute, and BMEP in psi. All values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is BMEP and how is it determined?
A: Brake Mean Effective Pressure is the average pressure that, if acting on the piston during the power stroke, would produce the measured brake horsepower. It's typically measured through dynamometer testing.

Q2: How accurate is this formula compared to actual dyno results?
A: This formula provides a theoretical estimation. Actual dyno results may vary due to factors like mechanical efficiency, friction losses, and other real-world conditions.

Q3: Can this formula be used for all engine types?
A: The formula is primarily designed for four-stroke internal combustion engines. Different engine types may require modifications to the formula.

Q4: What's the significance of the constant 792000?
A: This constant converts the product of displacement, RPM, and pressure into horsepower units, accounting for unit conversions and the definition of horsepower.

Q5: How does displacement affect horsepower calculation?
A: Larger displacement generally results in higher horsepower, as it's directly proportional in the formula. However, other factors like BMEP and RPM also significantly influence the final result.