Blairs the basic design of twostroke engines software showing 17 of 7 messages. New feature of racingsm software, the 2stroke exhaust segment splitter. This is superb detail to accompany campus lecture by dr. They are so simple and fun that ive always enjoyed tinkering with them. This requires the same type of equipment and software option pack as combustion chamber pressuring mapping. There are many ways to boost the power, one of which is by installing a tuned pipe. The basic design of the two stroke enginea and the book a. In addition, this comprehensive publication features a computer program appendix of 28 design programs, allowing the reader to recreate the applications described in the book.
The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Two years before finishing school i started racing 50cc motorbikes and started tuning 2 stroke engines. I have heard trs software is similar, but gp blair s is cheaper plus it comes with a book explaining all of the engineering behind it. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. Design and simulation of twostroke engines gordon p. His work has been so extensive in this area that it became necessary to. Gordon purves blair was born in larne co antrim in 1937 and educated at larne grammar school. Bimotion 2stroke software has been commercially available and in professional use since 1991. You can also save and load the data by using the provided. The official home page of our 2 stroke wizard tuned pipe.
The way to calculate the return timing and length of the negative wave in a 2 stroke expansion chamber is by this formula. An accurate engine simulation software package virtual 2stroke is employed to model the entire twostroke engine and to demonstrate not only its effectiveness as a design tool in this area but also that it can accurately predict the abovementioned performance and emission characteristics. Design and simulation of two stroke engines is a unique handson information source. The website does not intend to compeed with any other website dealing with 2 stroke tuning, and the information shared is not at all as thorough as what you can get from reading the books.
The information used in the programs calculations was taken from the books a. Im porting the software from the back of the book and ive found some errors in the listings. Split your calculated 2stroke exhaust up to 42 sections with regular length or even more with irregular lengths. The website does not intend to compeed with any other website dealing with 2stroke tuning, and the information shared is not at all as thorough as what you can get from reading the books. Technology to commercialise the engine design software he had developed. Advanced twostroke tuned exhaust system the challenge the society of automotive engineers clean snowmobile challenge 2002 sae csc 2002 is an engineering. My first attempt at pipe design was a miserable failure. Small values of kh are best suited to grand prix engines with narrow power bands, larger. It was written in 1990 before blair really got hooked on unsteady gas dynamics.
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube. However, gordon knew that the future of gp racing was 2stroke engines and. With the traditional lubrication technique of mixing oil into the fuel, they also have the advantage of working in any orientation, as there is no oil reservoir dependent on gravity. Since that time, professor blair has developed substantive new theories related to the two stroke engine. His work has been so extensive in this area that it became necessary to publish a greatly expanded book on the topic. The basic design of two stroke engines internet archive. The basic design of two stroke engines offers practical assistance in improving both the mechanical and performance design of this intriguing engine. Asking for expressions of interest in a free 2 stroke pipe calculator software. It is less helpful for those with a more casual interest. This is a module for 2 stroke exhaust calculation based on famous g. I have the software that comes with blair s second book, design and. Apr 08, 2007 if you are just getting started get g.
This simulation program deals with many aspects of engine design related to the cylinder head. The basic design of two stroke engines by gordon p. However, gordon knew that the future of gp racing was 2stroke engines and his 2stroke engine designs went on to power queens rider ray mccullough to many victories over the ensuing years, including seven ulster grand prix victories to equal the greats such as giacomo agostini, mike hailwood and stanley woods. He will be fondly remembered, but greatly missed by all his family, friends and colleagues.
Blair s the basic design of two stroke engines software showing 17 of 7 messages. The complete engine geometry together with these two exhaust systems is simulated using an engine simulation software package virtual 4stroke and the experimentallyrecorded exhaust pressure diagrams and performance characteristics of power, torque, etc. A simple 3 stage two stroke exhaust calculator based on formulas of g. Twostroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. Two stroke tuners handbook 2 another mistake commonly made, sometimes even by those who have enjoyed some success in modifying twostroke engines, is to believe in a kind of mechanistic magic. The information used in the programs calculations was taken from the books the basic design of the two stroke engine and the book design and simulation of two stroke engines. The author, having designed and developed many two stroke engines, offers practical and empirical assistance to the engine designer on many topics ranging from porting layout, to combustion chamber profile, to tuned exhaust pipes. Jun 29, 2018 complete calculations for professor gordon blair 3 stage diffuser expansion chamber. The 500 cc 2stroke racing motorcycles that used to be popular in the 500gp races would produce peak power output of around 180 hp, but in a very narrow rpm range. The complete engine geometry together with these two exhaust systems is simulated using an engine simulation software package virtual 4 stroke and the experimentallyrecorded exhaust pressure diagrams and performance characteristics of power, torque, etc.
If you build things today, and you want to build two stroke engines tomorrow, this book will tell you how. Calculates required ranges of jennings or blair angle areas, mean areas and time. Two stroke engine and exhaust design software post by gerrit. Wrt1d1x2sw where wrt1 is the wave return time for the first part of the wave, d1 is the distance from cylinder port to beginning of diffuser, and sw is the speed of the wave which is determined by the temperature and. Two stroke engine and exhaust design software post by gerrit sun jan 17, 2016 10. Design and simulation of twostroke engines book osti. For instance pipe calculators would determine the belly diameter based on blair s maximum size 2. I have heard trs software is similar, but gp blairs is cheaper plus it comes with a book explaining all of the engineering behind it. Blairs the basic design of twostroke engines software. Design and simulation of twostroke engines r161 gordon p.
If you build things today, and you want to build twostroke engines tomorrow, this book will tell you how. Unfortunately this is executable code, no source code. The basic principle of the tuned pipe is making use of the moving air masses in the exhaust to assist in the scavenging the process whereby the exhaust gases are removed and replaced with unburnt mixture of a 2stroke engine. Blair, 9781560910084, available at book depository with free delivery worldwide. Bimotion 2 stroke software has been commercially available and in professional use since 1991.
Great tool for those who are building exquisite format exhausts, one of the largest benefits of this module is that it can be used with any exhaust formula results. Amazon used the first of two books by gordon blair on the theory of two stroke behaviour. This coefficient kh is called the horn coefficient, with typical values between one and two. You can also save and mota software, 2 stroke engine simulation software, 2 stroke exhaust. The basic principle of the tuned pipe is making use of the moving air masses in the exhaust to assist in the scavenging the process whereby the exhaust gases are removed and replaced with unburnt mixture of a 2 stroke engine. Since that time, professor blair has developed substantive new theories related to the twostroke engine. We design, modify, and race hi perf 2 stroke rc marine engines on heavy nitromethane percentages. Design and simulation of twostroke engines is a unique handson information source. The way a two stroke motor works causes them to be f.
It is a fabulous guide for those with engineering backgrounds. Two stroke engine and exhaust design software north. For instance pipe calculators would determine the belly diameter based on blairs maximum size 2. You can also save and load the data by using the provided functions. The physics of a 2stroke engine is very complex compared to that of a 4stroke when we are trying to optimize horsepower, reliability, and reasonable width of the power band. Blair died on october 21st 2010 after battling cancer for several years. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly. Amazon used the first of two books by gordon blair on the theory of twostroke behaviour. The author, having designed and developed many twostroke engines, offers practical and empirical assistance to the engine designer on many topics ranging from porting layout, to combustion chamber profile, to tuned exhaust pipes. Racingsm software has features for many different areas 2 stroke exhausts development, drag racing features, simulators, carburetor tuning, connectingrod analysis etc with all this knowhow along with lufo racing heritage, we believe this is a very fair price. Blair of queens university belfast, and published by the society of automotive engineers. I have the software that comes with blair s second book, design and simulation of two stroke engines. Each intake port can be locked to a fixed timing relation with the exhaust port. In the design form first select the water cooled and reed induction options from the dropdown menus.
Complete calculations for professor gordon blair 3 stage diffuser expansion chamber. They are time area targets, piston controlled intake, exhaust, transfer, expansion chamber, cylinder head, piston load. Blair, professor emeritus at the queens university of belfast, have entered into a technical and consulting agreement for the exclusive worldwide license to use gpb engine simulation software source code for optimums two and fourstroke product development and for professor blairs. Bigger carburetors, higher compression ratios, altered port timings and expansion. Velosolex s 3800 2stroke tuning and engine design books. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. One other old way of calculating the dimensions of an expansion chamber relied on generic formulas that put the emphasis on the wrong things. I have the software that comes with blairs second book, design and simulation of two stroke engines. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine.
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