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| Design Exhausts That Work | Design Engine Porting |
| Full Cycle Simulation | Display HP & Torque Curves |
| Accepts 3.5cc To 500cc Engines | Runs 500 to 30000 RPM |
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Additions to the Expansion Chamber Construction
Utilities
The Expansion Chamber Construction utilities
have been extended considerably and are now accessed under
a separate item on the Main MOTA Menu. A sub-menu offers
the two selections "Constructing the Development Pattern
of a Cone" and "Printing the Development Pattern of a
Cone". It is the options provided under the second
selection which have been added to MOTA. You can now print
the development pattern of a cone and this may extend over
several A4 pages. Of particular note, you can produce the
pattern of a cone having either end or both ends angled to
the cone axis. A set of explanatory diagrams with text can
be displayed. 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.
The number of pieces and the overall bend angle are
entered through the keyboard. A MOTA engine data file may
also be accessed and the pattern of each section of the
expansion chamber printed. Alternatively, any one section
may be selected and patterns suitable for the construction
of an equivalent bend section printed This new feature allowing creation and
printing of Expansion Chamber sections
We now have a simple 2 stroke expansion chamber
design program.FREE download here
This program is not a part of MOTA, but it
has been put together by the same engineers as a starting
point for those wishing to begin from scratch. It
calculates the dimensions for both double and triple stage
diffuser expansion chambers from a few basic engine
dimensions. The information used in the program's
calculations was taken from the books The Basic Design of
the Two Stroke Engine and the book Design and Simulation
of Two Stroke Engines; both books are written by Professor
G.P. Blair of Queens University Belfast, and published by
the Society of Automotive Engineers. You are well
advised to read at least one of the books mentioned above,
since they contain the authors academic lifetime of
knowledge on the two-stroke engine.
There are several coefficients used in the
design of the expansion chamber these are a function of
the engines state of tune. Those used in this
program have been chosen for petrol engines, and are
in the range 50cc up to about 500cc per cylinder. It is
doubtful these formulae would work on small capacity
glowplug engines, since the exhaust gas temperature is
much lower, and the engine speed is much higher.
How it all began.......
MOTA ® is the brainchild of Dr Julian Van
Leersum, mathematics graduate from Monash University in
Melbourne, Victoria. He is of Dutch/Swiss parentage,
but now permanently resident in Australia.
With the successful MOTA ® software, Dr Van Leersum has managed to combine his professional interests in computing & mathematics with his enthusiasm for karting and motorcycle racing.
"It occurred to me that most home tuners cannot afford the expense of hiring time on a dynamometer to check the viability of adjustments or special parts" said Julian, "yet many people these days have a home computer which could easily run a suitably designed tuning programme."
"Although there is really no shortage of books on the subject of 2-stroke tuning and preparation, I knew that an active software programme would be able to offer so much more." So, this is how MOTA was conceived.
MOTA is an engine simulation program suitable for everyone from the enthusiast to the university researcher - from the beginner racer to the professional tuner. See testimonials. You can test your own engine and then re-test and compare your modifications - or build your ultimate engine right on the screen. Millions of fluid and thermo-dynamic calculations are made by MOTA representing the conditions inside your two-stroke engine throughout it's complete operating cycle.
No previous knowledge of the two-stroke cycle engine is required - just input the required data and then run MOTA to set in motion this powerful process. Test your own theories on porting and exhaust pipe design; explore the limits of various intake methods; or just look for the highest power output from your own engine.
MOTA will accept a single-cylinder design, which will also cater for many multi's where 2, 3 or more cylinders of the same basic layout are repeated. Easy-to-operate, accurate and hours of fascinating results to enjoy! Excellent graphics you can analyse and compare. MOTA's "Two-stroke Dyno" will give you and your PC the equivalent of many experts knowledge.
MOTA and it's related set of programs have been developed to simulate the performance of high-output single cylinder two-stroke engines. It will simulate one of the cylinders of a multi-cylinder two-stroke engine provided that the cylinders are identical in layout and dimensions and each cylinder has a seperate exhaust and induction system. It allows simulation of engines with reed-valve, rotary-valve and piston port timed induction systems. Simulation of engines with either a box-silencer or an expansion chamber is also possible.
Because MOTA solves the equations describing the conservation of fluid and thermodynamic properties throughout an engine, it requires specification of the full engine geometry. This is accomplished through a menu driven environment, which prompts you for the required dimensions which are easily entered via the keyboard.
The output from MOTA is provided in two forms; a file, which summarises the engine geometry and performance, and a graphical interface which allows you to plot the various performance variables. The output file and these plots can be printed if you have a printer connected to your computer.
How MOTA works for you
The strength in MOTA lies not so much in it's
ability to predict accurately the performance of an
engine, but in it's ability to allow evaluation of two
different engine configurations. For example, if you have
the MOTA produced power curve for an engine, and you want
to see if modifying one of the exhaust pipe dimensions
will increase or decrease power, then you can change the
particular dimension and re-run the MOTA simulator.
Comparison of the new power curve with the old will allow
you to determine whether or not the change will be worth
making.
Where is MOTA different to other computer programs and tuning manuals - and what can it do?
Some karting race results
with MOTA.
The current IWT "MR1" pipe for long circuit
karting in the 100cc Non-gearbox class was designed using
MOTA. -- and it won the 2001 National Superkart
Championship for our own team member Michael Rogers. It is
an evolution of all of our earlier designs, that for the
past 5 years have seen multiple state championships come
our way, and at most meetings qualify at the front of the
pack !!
The Mallala lap record for the 100cc Yamaha heavy class is now in the possession of Ian Williams, using this pipe as designed with the aid of MOTA.
The late model crankcase reed induction Yamaha YZ80 engine was "tuned" for Superkart racing using MOTA. to redesign the porting and design a new reed and exhaust system -- before the first engine had even been run !! From the first time these engines hit the track they have been winning right across Australia.
The exhaust design for this has been used to win multiple State and National Championships, as well as the reed design now being used as "the" setup for all karts run in this class across Australia today.
FOR MORE INFORMATION REFER
TO THE USER MANUAL
FOR ALL MOTA PROGRAMS A
PDF FILE
MOTA Operating
System Requirements
MOTA
IS A Microsoft Windows Program
System Requirements
Here is the hard part , determining if your computer will run MOTA v8.0
MOTA v8.0 requires a CPU which supports the AVX or AVX2 instruction set extensions. MOTA uses these extensions in order to execute its code quickly.
Most Intel CPU model numbers i3, i5, i7 and i9 manufactured after 2013 do support these extensions, whereas many Intel processors manufactured before 2013 do not. Even current Pentium and Celeron processors do not support these extensions. Only a few relatively recent AMD Ryzen processors will support the instruction set extensions.
You need your processor model number before you can determine what instruction sets it supports. To find the model number of your processor, press the windows symbol key, generally located at the bottom left of your keyboard. Depending on your windows version, the resultant screen will show a "settings" or "control panel" button. Press whichever button you can find and select the "system" option. You may have to scroll down and select the "About" option, or the information regarding the processor model number might be on the screen if "control panel" was selected. Note the processor model number.
The simplest method of determining if your INTEL processor will run MOTA v8.0 is to visit the web page: http://ark.intel.com/content/www/us/en/ark.html and in the search box provided in the top right hand box, type in the model number of your CPU, eg I7-8750H.
The Intel database may or may not identify your processor. If the Intel database does recognise your processor model, you will be presented with a scrollable list of its properties once you click on the model number. Go down to find the heading "Advanced Technologies", and look for the sub-heading "Instruction set extensions". If supported, one or both of AVX and AVX2 will be listed here.
Once you have carried out the above, please advise IWT of the result. We may be able to make a copy of MOTA for you if neither AVX nor AVX2 is supported by your processor, or perhaps if your processor does not appear in the Intel database. We will definitely be able to make a copy of MOTA for you if either AVX or AVX2 is supported.
Another way of determining if your computer will support the AVX or AVX2 is to download from the web https://www.hwinfo.com/download/ and download with the LIGHT GREEN (bottom) button on the left pane (Installer for Win32 and win64). Install and run the utility hwinfo – it might install as hwinfo32 or hwinfo64. When you run it, you will see in the left hand window under "FEATURES" a list of CPU properties. Those coloured green are supported by your CPU. If either or both of AVX or AVX2 is coloured green, then you can run MOTA v8.0. Please advise IWT of these properties, even if AVX2 and AVX are greyed out. In the latter event, we might still be able to make a version of MOTA for you.
DOES MOTA WORK ON A MAC ? MOTA will not run on Macintosh computers,
Tablets, Smartphones or Unix (Linux) based computers or
singlecore Pentium or celero n processor
computers. It will run only on Windows..
Special features include
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