We now have a simple 2 stroke expansion chamber design program.
Alternatively, any one section may be selected and patterns suitable for the construction of an equivalent bend section printed. A MOTA engine data file may also be accessed and the pattern of each section of the expansion chamber printed. The number of pieces and the overall bend angle are entered through the keyboard. You may also define a single straight cone and print the patterns of each of the pieces which, when welded together, will provide an equivalent bend section. A set of explanatory diagrams with text can be displayed. Of particular note, you can produce the pattern of a cone having either end or both ends angled to the cone axis. You can now print the development pattern of a cone and this may extend over several A4 pages. It is the options provided under the second selection which have been added to MOTA. A sub-menu offers the two selections 'Constructing the Development Pattern of a Cone' and 'Printing the Development Pattern of a Cone'. The Expansion Chamber Construction utilities have been extended considerably and are now accessed under a separate item on the Main MOTA Menu. Where the bar intersects each curve a horizontal cursor is drawn and, to the right of the plotting area, the corresponding power and torque values and the engine speed are displayed.Īdditions to the Expansion Chamber Construction Utilities The display of Power/Torque curves has been enhanced by the inclusion of a vertical cursor bar which extends over the entire height of the plotting area and whose position can be controlled by the mouse. The earlier MOTA version 6.10 was an evolution of the v6.00 that includes some fabulous new tools. Of course the dimensions so provided could be inserted in a MOTA engine data file and MOTA-X then used to provide an optimum expansion chamber design for your engine over your choice of speed range. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2-stage or 3-stage diffuser. We also have a simple 2-stroke expansion chamber design program. However, MOTA 6.3 does not have the expansion chamber optimisation capability provided by MOTA-X. MOTA v6.3 does not require such high end machines to run, and, as always, will run on nearly any computer made after 2000.
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