Blair 2 stroke software

Though it was my intention to produce this article within 30 days from when I contacted everyone about this project it now seems clear that this will have to be extended a bit to accommodate everyone's needs.

I have received or it is on its way software from the following sources for evaluation. As it turns out there is some competition in that area too as I soon realized that another manufacturer TSR also provided software for this application. I will write specific sidebar articles about these programs. In time I may perform some modifications to the only nitro burning vehicle I have it's actually my sons , a boat which is driven by an airplane prop.

It is food for thought. In the following section I share my first impression experiences using each software package I have for evaluation - listed in alphabetical order. I will outline each software program using as much detail as possible in subsequent reports. Bimotion - Version 1. Programs - bimzip. This software package was received electronically. It was easily installed on my virtual PC which uses Windoz 95 as its operating system.

It will also install on earlier versions of the Windoz OS which would include version 3. Its main interface is DOS and it is menu driven.

If your machine only uses DOS only you will be fine. Though I'm no expert with DOS I understand that much earlier versions of it would be enough to run this software piece - exactly how much earlier is not specified. It is written using mostly the metric system for data input. The total time it took me to install the program and get it up and running was less than 5 minutes. The program is password protected easy to use and easy to read.

Bimotion comes with an 18 page electronic manual and includes instructions for installing the software. I printed it out for easy reference. The manual explains some fundamentals such as how to work with time area targets TA , piston controlled intake engines and how to determine piston parameters such as the height and width and distance from the crown to the top of the wrist pin hole. It includes information about the transfer ports.

Within the transfer port section is additional information about how to enter port shape data. Bimotion calls this the port height shape factor HSF. There is a section on expansion chambers.

It includes information which describes the different parts of the tuned pipe including its header, diffuser sections, its belly, baffle and stinger.

For the pipe manufacturing it explains how to transfer the data generated onto paper templates or sheet metal. There is information about compression, the compression ratio and the piston-connecting rod load and acceleration.

This allows for new calculations based upon lightening the piston and determining a new peak operating RPM. There is also information about gearing, rolling and air resistance. At the end of the manual is a section on the Y. Yamaha boost bottle. This manual describes the fundamentals of data entry - what the programs need in order to output useful information. The manual does not attempt to teach you about 2 stroke engines. It is assumed that the user knows enough about 2 stroke engines to understand engine design parameters.

Upon receipt of the software Mr. Alvarsson informed me that he is very willing to answer any and all questions I might come across using email.

Correspondence this way has been flawless to so far. Bimotion resides in Sweden so phone calls there might get a little pricey - from the US that is. I would consider email answers well within the range of acceptable performance from a software manufacturer. Alvarsson informed me that I am the first person to receive the updated version.

If you are the owner of an earlier version of the Bimotion software you should be receiving the new version very shortly. Alvarsson also informed me that he sends out free updates to Bimotion software programs to its owners. Once again I'm lucky enough to get the first look at a new version of a two-stroke software release for product review.

The update included 2 files. The tuning. It took about the same time to type this sentence as it takes to replace the files which in effect, installs the update. I noticed the new version of the program shows a few visual changes within its interface.

Nothing dramatic, but I did notice it had been improved - perhaps "refined" would be a better word to use to describe the change. The interface is still simple and straight forward. The instruction manual has been thoroughly overhauled. Though it's still about the same length as the version that ships with the earlier version it is much easier to follow since it uses actaul diagrams that look as though they have been cut from the actual program screen and pasted into the revised booklet.

This improvement allowed me to more easily understand the Bimotion programs and what they look like on the screen. This takes the version number all the way up to 2. This new version includes squish velocity calculations. I'll add information about this specific update in the near future. Alvarsson informed me that the 1. Instead a much more aggressive update was planned and included with this newest version release which was released to the public.

Click Here for home page and purchasing information. Programs - 1. This would include piston ported, spark ignited industrial engine and reed valve, spark-ignition engine with expansion chamber exhaust. They are available separately, however it looks as though they will not be evaluated as part of this report. If they do arrive I'll detail this software with a complete examination.

It is distributed on 2 high density diskettes. I installed this DOS based software on my Windoz 95 machine after thumbing through a very short installation manual. The manual states that the software will install on Windoz 3. It required inserting the diskette labeled "disk 1", and a simple double click to get things started. It took a couple of minutes for the data to transfer from the floppy to the hard drive before it asked for disk two.

There is less data on the second disk so it didn't take as long to unload its data. The whole process took about 12 minutes. There installation text is also available to read electronically after the programs are installed. Blair by faxing them to the provided number. The accompanying text asks you to provide your own fax number or address for a response, the serial number of the software diskette mine had none , the program number which is displaying problems, the exact nature of the problem, the computer model and the printer used with the computer.

It further states that if you do not comply precisely to the outline for submitting problems, you will not get a response. In addition it is stated that during periods of holiday responses could be as long as a month - this would include the summer months, June through September. The user manual to this software is the book Design and Simulation of Two-Stroke Engines which is pages in length.

This book is not a beginners manual for learning 2 stroke engines - it is more of a study of the intricacies of these type of engines. Though it starts out by telling the basics of 2 stroke spark ignited engines, it quickly gets deep into the processes needed to define engine parameters using mathematical formulas. Professor Blair has spent a great deal of time discovering, defining and determining boundaries to use when designing engines. The content of the book is very math intensive and would prove to be very difficult reading for all but the most highly interested individuals - I say "highly interested" but what I mean is "engineers" or those who have no difficulty reading this type of material.

For those who have not spent much time inside SAE books or other highly technical literature this book may be too much-too fast. It may be necessary for some readers to do a tremendous amount of research in order to understand all the units of measure, terminology and other nomenclature used within its pages. Blair does not assume the reader to be a "newbie" 2 stroker so it is easy to say that he provides ample information for those "in the know" to easily proceed and use the books opening pages to decode the rest of the book.

It may be easier to understand the text when the appropriate software program is running along with the chapter it pertains to. Engineering Inc. This software is classified as a two cycle wave action simulator - it will visually display the wave activity of a running two-stroke engine. It took a little longer than I anticipated to receive a copy of Dynomation 2 for this article but part of the delay was on my end - I took a long vacation a day or two after it arrived.

Rather than trying to hurry and post a review I decided to take the time to read the manual and evaluate the program when I had the time to properly dedicate to it.

It became clear to me after thumbing through the manual that it would take my full attention while operating the software to do the program justice. There is a large section of the manual which explains the functions of the program file systems, the F keys and other keyboard combinations. Additionally, there is a separate quick start card which outlines installation on one side and the function of the F keys and such on the other. There are a lot of shortcut keys with Dynomation 2 - I can remember thinking the card will come in handy when trying to familiarize myself with the program.

Turners Two Stroke Racing for his squish velocity program. I might add that Bimotion now has a squish velocity program which has just been released with its new 2. Dynomation 2 is supplied on a single high density diskette and requires the supplied dongle which is attached to the printer port in order to be able to use the program. It was running Windoz 98 as the operating system. The software installed quickly and easily when following the concise but brief instructions.

The data was transferred to my hard drive in a couple of minutes. Technical support is available through email, phone or fax using the numbers listed above. To be able to run the simulation it is necessary to enter a very tightly focused array of engine parameters which are clearly outlined and explained in the nicely designed 72 page loose leaf binder which serves as the instruction manual for operating the program.

The data is as common as the engine's bore and stroke but it dives in deeper when it asks for things like the total inlet track length, the crankcase compression ratio and the scavenging efficiency. There are specific easy to understand guidelines to follow when entering the scavenging data and inlet track length. It is stated that the BSFC brake specific fuel consumption may be the single most important piece of data for a realistic and reliable simulation so there is detailed advise about how to understand and interpret this function.

There are some pages dedicated to gas flow theory and some words about acoustic waves and their relationship to finite amplitude waves. The text is clearly written, explained well and seems to cover more ground than it contains. The last 10 pages contain information about connecting rods. Engineering has an interest in the Hot Rods brand of replacement connecting rods and spends a few of its pages explaining the elastic tendencies of these important pieces.

I found it to be interesting and entertaining reading. Inquires or requests for technical assistance may be directed by fax within Australia: 08 From overseas: 61 8 Programs - engine.

Included in this package is a series of formulas which are integrated into a complete engine analysis package. The pipe Design Program is now also integrated into this software package.

I thought I could use it to design the engine of my sons boat but it turns out the engine in the boat is quite a bit smaller than what's outlined above it's. To do justice to the makers of the software I will do my best to review it the best I can.

Support is available either by phone or Fax Support via email can be directed to: teturner tsrsoftware. The TSR programs may be better understood if their file name is explained in further detail. Check Volume - to calculate the compression ratio, shows final static compression. Compress - take a look at the effects of compression upon power output. Degree It - determine crank angle and height in millimeters from TDC as well as piston acceleration at a given rpm.

Engine Draw - design changes visually represented. Head Volume 1 - used to design a modern head using the squish radius. Head Volume 2 - used to design a modern head using the squish angle. Head Volume 3 - used to design a modern bathtub design head. Hemi Flat - used to design combustion chambers that have a flat top piston. Tub Head - used to design a modern round bathtub design head. I chose a trapped compression ratio of 7. I choose a squish clearance of 1.

The output data computer a maximum squish velocity of The squished kinetic energy comes out to 9. Programs 4. Program 6. The program asks for either the target power level from the swept volume at a specific engine RPM, or the target BMEP only, or the target BMEP level from a given swept volume at a specific engine speed.

In my case I choose the first option. I entered the target power in kW units The output showed the engine would need a total exhaust time area of. It then provides two total transfer port time area targets - an upper and a lower value.

The upper value is. The total inlet time was calculated at. The program gave me the following information. The intake ports will have to have their area calculated elsewhere since the data input was for degrees of crankshaft rotation only. In this reed valve engine the inlet ports are always open. There wasn't a way to enter the data of 5 transfer ports that had 3 different widths so I entered them all as 23 mm wide. That's a little on the high side. Note how the changes in the port timing also change the port area and time area.

In this case the modified engine shows port time area that's almost the same as the stock engine at RPM. By using the data entry parameters as outlined in Part 5 I was able to correctly represent the reed system. The program calculated the size of carburetor that could run through this cage at the specified target RPM as being 34 mm.

The reed natural frequency is Hz and the engine natural frequency is Hz. The reed tip ratio is 0. It didn't ask me for the actual reed stop plate radius so I wonder if this is an ideal radius for that piece. The change I made in the reed petal thickness from the original. In order to have it come close to matching at RPM Hz the petal thickness would have to be increased to only.

Engine Builds MacDizzy Update ! To get started the software asks "Are you running the program? Exhaust Port Data