Camshaft Duration
Calculate Camshaft Duration instantly with the exact formula and a worked example.
Camshaft Duration
Intake opens BTDC°
Intake closes ABDC°
Exhaust opens BBDC°
Exhaust closes ATDC°
Intake duration
250°
Exhaust duration
250°
Intake centerline ATDC
105°
Lobe separation angle (LSA)
107.5°
Valve overlap
35°
More about: Camshaft Duration
What it calculates
The “Camshaft Duration” calculator computes Intake duration in ° from 4 parameters: intake opens btdc (°), intake closes abdc (°), exhaust opens bbdc (°), exhaust closes atdc (°).
Helps estimate the cost of car ownership, pick parameters, and compare options.
Example calculation
With parameters Intake opens BTDC = 20 °, Intake closes ABDC = 50 °, Exhaust opens BBDC = 55 °, Exhaust closes ATDC = 15 ° the result is 250 ° (Compare timing measured at the same lift (0.050" or 1 mm)).
How to use
- Enter intake opens btdc, intake closes abdc, exhaust opens bbdc and exhaust closes atdc — each field above is adjustable with a slider.
- Intake duration (°) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Camshaft Duration calculated?
The Camshaft Duration calculator computes Intake duration (in °) from intake opens btdc, intake closes abdc, exhaust opens bbdc, exhaust closes atdc. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Camshaft Duration calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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