Per-cylinder displacement for the engine with bore 3.78 inches and stroke 4.5 inches is approximately

Per-cylinder displacement for the engine with bore 3.78 inches and stroke 4.5 inches is approximately

• A. 50.5
• B. 40.0
• C. 60.0
• D. 70.0

Answer: (A)

Displacement per cylinder is the volume the piston moves through in one complete sweep, found with V = π r^2 s. Use the bore to get the radius: r = 3.78 / 2 = 1.89 inches. The cross-sectional area is πr^2 ≈ π × (1.89)^2 ≈ π × 3.5721 ≈ 11.22 square inches. Multiply by the stroke, s = 4.5 inches: V ≈ 11.22 × 4.5 ≈ 50.5 cubic inches. So the per-cylinder displacement is about 50.5 in^3.

Displacement per cylinder is the volume the piston moves through in one complete sweep, found with V = π r^2 s. Use the bore to get the radius: r = 3.78 / 2 = 1.89 inches. The cross-sectional area is πr^2 ≈ π × (1.89)^2 ≈ π × 3.5721 ≈ 11.22 square inches. Multiply by the stroke, s = 4.5 inches: V ≈ 11.22 × 4.5 ≈ 50.5 cubic inches. So the per-cylinder displacement is about 50.5 in^3.