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Cajun Timing Calculator Two-stroke port timing from depth micrometer readings

Take every depth-mic reading from the top of the flange with the piston at bottom dead centre, and enter them on the drawing. Exhaust and transfer durations and blowdown appear in red; deck height, port heights, opening angles and inlet timing are listed below.

piston at BDC piston crown at TDC transfer T exhaust E inlet bore flange top: all depth-mic readings start here stroke A C B D shim

Swipe sideways to see the whole drawing.

EExhaust duration (°)—
TTransfer duration (°)—
BDBlowdown (°)—

Press Calculate to show the results on the drawing and in the table below.

Note 1: Jacking shim raises the sleeve for rotation. Enter 0 if not used.

Note 2: Enter both exhaust and transfer readings for blowdown calculations.

All results

Press Calculate to fill this table.

Every value the calculator produces, in the original order. Tinted, bold rows are the key results also shown on the drawing.

Original reference

Original timing measurement diagram: A top of flange to BDC, B top of flange to top of exhaust port, C top of flange to top of transfer port, D thickness of jacking shim

The original sketch of the four readings.

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