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Engine Bore Formula:
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Engine bore refers to the diameter of the cylinder in an internal combustion engine. It is a critical measurement that, along with stroke length and number of cylinders, determines the engine's displacement and overall performance characteristics.
The calculator uses the engine bore formula:
Where:
Explanation: This formula calculates the bore diameter based on the engine's total displacement, stroke length, and number of cylinders.
Details: Calculating engine bore is essential for engine design, performance tuning, and understanding engine characteristics. The bore-to-stroke ratio affects engine torque, power band, and efficiency.
Tips: Enter cubic inches (engine displacement), stroke length in inches, and number of cylinders. All values must be positive numbers.
Q1: What is the relationship between bore and engine performance?
A: Larger bore diameters generally allow for larger valves and better breathing, which can increase power output, but also affect combustion characteristics and engine longevity.
Q2: What is a typical bore-to-stroke ratio?
A: Most production engines have a bore-to-stroke ratio between 0.8 and 1.2. Over-square engines (bore > stroke) tend to rev higher, while under-square engines (stroke > bore) produce more torque.
Q3: How does bore size affect engine displacement?
A: Engine displacement is calculated as (π × bore² × stroke × cylinders) ÷ 4. Increasing bore size has a squared effect on displacement.
Q4: Are there limitations to increasing bore size?
A: Yes, increasing bore size is limited by cylinder wall thickness, cooling capacity, and the physical size of the engine block. Excessive boring can weaken the block and affect reliability.
Q5: How precise should bore measurements be?
A: Engine bore measurements are typically precise to 0.0001 inches (0.00254 mm) for performance applications, as even small variations can affect compression and performance.