Cam Duration Calculator

Calculate camshaft duration from valve events

Valve Events

Lobe Type

Opens Before TDC (degrees)

Closes After BDC (degrees)

Checking Lift (inches)

Formula

Duration = Opening + 180 + Closing

Duration @ 0.050" Lift

260 degrees

Aggressive Street/Race

Duration Comparisons

Duration @ 0.050"260 degrees

Est. Duration @ 0.006"270 degrees

Est. Advertised Duration290 degrees

Lobe Centerline105.0 degrees

Expected Performance

RPM Range3500-7000 RPM

Idle QualityRough, lopey idle