Original H-O's
Otto Cycle
Compression Stroke Calculator

This calculator isolates the "Compression Stroke" phase of the Otto Cycle. It computes values from BDC to TDC at 10 crankshaft degrees increments. Select an engine and camshaft intake profile or enter your own values. Then click on the Calculate button.

The results table has the following meanings:

NOTE 1:

NOTE 2: Avg TQ is "anti-torque" in the sense that it is subtracted from the Avg TQ calculated in the "Power Stroke" calculator as a component of the net torque in the Otto Cycle. See "Friction Calculator" for the other "anti-torque" component.

NOTE 3: Effects due to intake tract resonance, Volumetric Efficiency, spark timing changes, piston ring leakage, etc. are ignored by this calculator.



Avg TQ:
Crank
Angle
|Piston
Pressure
|Rod
|Angle
|Side
|Thrust
|Rod
|Force
|Effect
|Lever
|Effect
|Torque
BDC
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
TDC