Presently we have the following 3 desktop applications that work on windows 98, XP, Vista and Seven. Note - these programmes do not work for windows 8.
This programme enables the user to calculate the piston position relative to tdc given the crank angle. Alternatively the crank angle can be calculated given the piston position relative to tdc. Hence it is possible to accurately measure the port timings for an engine.
It is worth noting that this programme allows the input of gudgeon/crank offset, an important requirement for the calculation of accurate piston position.
The image below shows the programme being used to calculate the piston position for an engine with a stroke of 54.5mm, rodlength 110mm and gudgeon pin offset of 10mm.
This programme enables the user to calculate piston position, velocity and acceleration for upto 3 engines simultaneously. The output is shown both graphically and numerically.
The programme will also calculate conrod obliquity parameters such as angle, velocity and acceleration for upto 3 engines simultaneously. The output is shown both graphically and numerically.
This is a full blown gas dynamics engine simulation programme for piston ported two-strokes using a box type exhaust system, such as those found on chainsaws, large scale RC aircraft etc. Engine dimensions such as port timings, port areas, inlet length etc plus the exhaust system parameters are input to the programme. At this point an engine simulation is performed.
Shown below is the results for a JLO372 industrial type engine with 3 different inlet lengths. It is evident that the longest length of 180mm gives a maximum power of 11.76 kW compared to 12.09 kW for the 125mm inlet. At speeds below 3500 revs/min however, the 180 mm inlet outperforms the 125mm inlet. The black line represents the standard inlet length of 155mm.
Making an adjustment to the inlet length for a JLO 372 engine.