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Auto Mod Engine Displacement Calculator

Calculate engine displacement from bore, stroke, and cylinder count. Convert cubic inches to liters and compare stroker or overbore combinations.

Use this result well

Inputs that matter
Bore Diameter, Stroke Length, Cylinders
Output to expect
Engine Displacement Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Single Cylinder Volume

Cylinder volume equals pi times bore radius squared times stroke length. Bore and stroke must be in the same units (inches or mm).

V = π × (Bore/2)² × Stroke

Total Displacement

Multiply single cylinder volume by number of cylinders. For V engines, each bank contributes half the total cylinders.

Total = V × Number of cylinders

Unit Conversions

1 liter = 61.024 cubic inches. 1 cubic inch = 16.387 cc. Common conversions: 350 CI = 5.7L, 302 CI = 4.95L, 454 CI = 7.4L.

Liters = CI / 61.024

Updated: July 2026

Example Scenarios

4.000" bore × 3.480" stroke × 8 cylinders = 349.85 CI (5.73L). The iconic SBC 350 displacement.

Overbore and stroker: 4.125" × 4.000" × 8 = 427.65 CI (7.01L). Common LS stroker combination for big-block power in small-block package.

86mm bore × 86mm stroke × 4 = 1,996 cc (2.0L). Square bore/stroke ratio common in modern 4-cylinder performance engines.

Common Mistakes to Avoid

Using bore diameter instead of radius in the formula

The formula uses bore radius (bore ÷ 2), not diameter. Using full bore diameter overestimates displacement by 4×.

Mixing metric and imperial units without conversion

Convert all measurements to the same unit before calculating. 86mm bore with 3.48-inch stroke requires converting one unit — 86mm = 3.386 inches.

FAQ

Displacement = π × (bore/2)² × stroke × number of cylinders. For a 4.000" bore, 3.480" stroke, 8-cylinder: π × 2² × 3.480 × 8 = 349.8 cubic inches.

Bore is cylinder diameter; stroke is piston travel distance. Oversquare engines (bore > stroke) rev higher; undersquare (stroke > bore) produce more low-end torque.

Divide cubic inches by 61.024. Example: 350 CI ÷ 61.024 = 5.74 liters. Multiply liters by 61.024 to get cubic inches.

No. Displacement sets airflow potential, but horsepower depends on RPM, VE, boost, fuel, and tuning. A 2.0L turbo can exceed a 5.0L NA engine in horsepower.

A stroker uses a crankshaft with longer throw than stock, increasing stroke and displacement without changing bore. A 5.3L LS stroked to 6.0L+ adds torque and power from increased air volume.

About Auto Mod Engine Displacement Calculator

Engine displacement determines airflow potential, power capacity, and classification for racing classes and insurance. Calculate total displacement in cubic inches and liters from bore diameter, stroke length, and number of cylinders.