1. What is Crank Radius?

Crank Radius of Engine is the length of the crank of an engine, it is the distance between crank center and crank pin, i.e. half stroke.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( r_c \) — Crank Radius (m)
• \( l_s \) — Stroke Length (m)

Explanation: The crank radius is exactly half of the stroke length since the piston travels twice the crank radius distance from bottom dead center to top dead center.

3. Importance of Crank Radius Calculation

Details: Accurate crank radius calculation is crucial for engine design, performance analysis, and understanding the mechanical relationships in internal combustion engines.

4. Using the Calculator

Tips: Enter stroke length in meters. The value must be valid (stroke length > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is crank radius half of stroke length?
A: Because the piston moves from bottom dead center to top dead center, covering a distance equal to twice the crank radius.

Q2: What are typical crank radius values for automotive engines?
A: Typical values range from 40-60mm for passenger car engines, depending on engine size and design.

Q3: How does crank radius affect engine performance?
A: Larger crank radius increases piston stroke, which can improve torque but may reduce maximum RPM capability.

Q4: Can this formula be used for all types of engines?
A: Yes, this fundamental relationship applies to all reciprocating piston engines regardless of fuel type or configuration.

Q5: What units should be used for input values?
A: The calculator accepts meters as input, but you can convert from other units (mm, cm, inches) as needed.