Cam Timing Calculator
This calculator will help you rapidly determine the perfect camshaft for your application.
In the upper area, calculate individual valve events and lobe centerlines by entering Intake and Exhaust Duration, Lobe Separation and Advance.
OR
In the middle area, change the centerlines and see what it does to the individual events and the resulting Lobe Separation and Advance.
OR
In the lower area, enter individual events to generate the cam's required Intake and Exhaust Duration, Centerlines, Lobe Separation and Advance numbers.
To learn how to use the calculator and find a cam based on results, watch How the Summit Racing Cam timing Calculator Works. For a step-by-step guide to choosing individual events, watch How a 4-Stroke Engine’s Piston Motion and Valve Events Interact.
For a written guide on choosing a cam from the Summit website using the calculator's outputs, read How To Purchase The Perfect Cam.
Notes:
1.) For accuracy in comparisons, always use figures measured @ .050 in. lift.
2.) If opening the intake Atdc or closing the exhaust Btdc, enter as a negative (-) number.
| Intake | Exhaust | |||
|---|---|---|---|---|
| Duration: | ||||
| Lobe Separation: | ||||
| Advance: | ||||
| Centerline: | ATDC | BTDC | ||
| Open: | BTDC | BBDC | ||
| Close: | ABDC | ATDC | ||
| Overlap: | ||||