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.
Specialist tool for Auto Mod1 documented formulaFocused single-task workflowPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Bore Diameter, Stroke Length, Cylinders
Output to expect
Engine Displacement Calculator
How it works
1 documented formula across 1 calculation mode
- Keep 1 bounded input within the limits shown beside the fields.
- Confirm that every value uses the unit and time basis shown before comparing scenarios.
- Change one input at a time to see which assumption materially changes the result.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Single 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 × StrokeTotal Displacement
Multiply single cylinder volume by number of cylinders. For V engines, each bank contributes half the total cylinders.
Total = V × Number of cylindersUnit 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 / 61.024Updated: 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
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.