There are many ways to boost the power, one of which is by installing a tuned pipe. The most basic form of a tune pipe is shown in the figure below with corresponding wave equations. Exhaust pipe design with cone layout software by paul crowe if you have ever tried to layout a conic section on sheet metal, cutting just the right piece, that when rolled over and joined on. I like the fact that i can see what pressurevacuum is present in the port at the different pistonport positions. As the forces in a twostroke pipe design have become more wellunderstood. Apr 28, 2015 this is a modified version of an article by jack kane which appeared in issue 036 of race engine technology magazine. There is no 2 stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 singlecylinder and our modules will work flawlessly. Dans motorcycle two stroke motorcycle exhaust pipes. The exhaust port opens and combustion gas starts down the pipe at.
Two stroke designmodification software the following are spreadsheets for different aspects of 2 stroke designmodification. Two stroke engine and exhaust design software post by ede. This small java applet uses design rules according to 22, 23, and 24, to size a tuned pipe for a 2 stroke piston engine. How to design a two stroke expansion chamber performance exhaust step 2. How to plot two stroke expansion chamber cones on paper from. Purchase with immediate download from digital river, shareit. The old adage of stuffing cases on every project just isnt true any more. The exhaust designer programme enables the user to design a two stroke exhaust system with ease, then with one click of the mouse, create a pdf document in any of the common paper sizes a4, a3, letter. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly.
Here is the official description for 2 stroke wizard tuned pipe. We test tirelessly to provide a head arrangement with the proper squish band width, clearance, bowl shape and volume to suit each individual combination. Small values of kh are best suited to grand prix engines with narrow power bands, larger. I guess 2stroke exhaust system design is all about tradeoffs, and i think for woods riding it may be better to lose unburnt charge out the tailpipe at high rpm longer pipe then push burnt gases. Software for fine tuning and design of two stroke engine. The information used in the programs calculations was taken from the books the basic design of the two stroke engine and design and simulation of two stroke engines. A complete two stroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. Free 2 stroke expansion chamber calculator software update. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. What was your initial experience 2 stroke wizard tuned pipe software download 2 stroke wizard tuned pipe pro version 2.
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. A performance exhaust system is a characterizing element for any internal combustion conveyance. Improve the performance of your twostroke engine with a torqsoft designed exhaust system. We shall send you a pdf document with the templates for manufacturing your exhaust. The calculations are assuming a speed of sound in the exhaust gas, which is not known. Blair of queens university belfast, and published by the society of automotive engineers. A triy collector arrangement utilizes three simple twointoone collectors pairing down to one outlet. The exhaust tuning of a 2stroke is designed to preserve the positive pulse going down the pipe and reflect that positive pulse back up the pipe. There are a multitude of designs and endless combinations that can be made to work well. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you. Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines.
When combustion occurs in a two stroke, the piston is pushed down by the expanding gases uncovering the exhaust port. A complete twostroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. A racing engine exhaust system uses an expansion chamber at the end of the pipe which is basically two cones that reverse themselves prior to the end stinger where the spent exhaust is allowed to. My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. This coefficient kh is called the horn coefficient, with typical values between one and two. Engineering acousticssonic supercharging of 2 stroke. This pipe design is then verified on our inhouse dynamometer, fit to your particular chassis using the method of sectioned cones, which results in a final product that has a unique works look. In the past a tuned pipe would have been tested on a stock engine but the length and shape of the pipe will differ on a tuned engine because of the way it is able to rev higher. The trend in high performance two strokes has continued towards more case volume, however each engine and application differ.
How exhaust port timing affects two stroke performance. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. The normal procedure for race engine design would be to keep the exhaust port as low and wide as possible and to match the blowdown target depending on pipe. Tom turner, master two stroke tuner, pipe builder, and the man that developed tsr two stroke racing software designed and built his 424cc yamaha rd400 dragbike to develop and prove his racing. Racingsm software 2stroke exhaust calculator lufo youtube. Npp neils power pipes handcrafted custom pipes and. Calculator mention in video sent to me by nico as called cone layout. With the traditional lubrication technique of mixing oil into the fuel. Defining the acoustic profile and influencing the powerband exhaust design is a more dynamic. Nov 02, 2019 in the past a tuned pipe would have been tested on a stock engine but the length and shape of the pipe will differ on a tuned engine because of the way it is able to rev higher. Two stroke engine and exhaust design software post by ede sun jan 17, 2016 5.
Torqsoft twostroke exhaust system designer programme. Varying 2stroke stinger diameter motorcycle engineering. I found most other software work on outdated blair and jennings formulas. There are many ways to boost the power, one of which is by. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer. How to design a two stroke expansion chamber performance exhaust step 7 duration. Two stroke design modification software the following are spreadsheets for different aspects of 2 stroke design modification. Improve the performance of your two stroke engine with a torqsoft designed exhaust system. Two stroke engine and exhaust design software page 2. From a 49cc racing engine, to a gp 125 engine, or a 1500 mercurial triple engine, or a 250 kart engine, racingsm software suits all. The pipe builder would make a pipe as the program dictated and then chunk the. Two stroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. Two stroke engine and exhaust design software post by dawid sat jan 16, 2016 7. There is a wealth of knowledge contained in this manual.
The exhaust system can be a vital tool for optimizing the performance of the engine, through the wa. How twostroke expansion chambers work, and why you should care. The way a two stroke motor works causes them to be f. Gordon jennings, two stroke tuners handbook is one of the few things id attempt to save from a total house fire. Most of the errors is to choose a less appropriate combination of.
As the forces in a two stroke pipe design have become more wellunderstood, designers have been able to create engines that take more advantage of them and in fact require an expansion chamber to run at all. How twostroke expansion chambers work, and why you should. This program calculates the dimensions for both double and triple stage diffuser expansion chambers from a few basic engine dimensions. The information used in the programs calculations was taken from the books a. Tom turner, master two stroke tuner, pipe builder, and the man that developed tsr two stroke racing software designed and built his 424cc yamaha rd400 dragbike to develop and prove his racing design software and prove it, it did. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. All too often the engine exhaust is an afterthought for the engine and chassis builders, yet its design and construction impacts significantly upon car performance. Bigger carburetors, higher compression ratios, altered port timings and expansion. Two stroke design instead you can enter the data of your cylinder with extreme facility and precision, and then analyze the port areas and the timing area in the engine cycle timing for each phase. Nov 05, 2009 i guess 2 stroke exhaust system design is all about tradeoffs, and i think for woods riding it may be better to lose unburnt charge out the tailpipe at high rpm longer pipe then push burnt gases back into the motor at low rpm shorter, but thats just my totally nonexpert opinion. How to design a two stroke expansion chamber performance. Advanced two stroke tuned exhaust system the challenge the society of automotive engineers clean snowmobile challenge 2002 sae csc 2002 is an engineering design competition for college and university student members of the society of automotive engineers sae.
The pipe will then help and pull out the gas from the crankcase, even manage to open the reed valve and pull more air through the engine. If you dont have excel or have a version of excel that doesnt work with. The basic design of the two stroke enginea and the book a. Freeware 2 stroke expansion chamber exhaust calculator program. Once i have that completed i would understand the geometry that i need and have an envelopescaffold defining the geometry. Jul 25, 2007 exhaust pipe design with cone layout software by paul crowe if you have ever tried to layout a conic section on sheet metal, cutting just the right piece, that when rolled over and joined on edge, you have a cone with the exact shape, size and angled openings desired, you know its not easy. You can also save and load the data by using the provided functions. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine. When the transfer ports are closed, a second returning wave in the pipe pushes back the fresh gas that was spilled out into the header, in the remaining blowdown window that is. Four strokes are the future of performance in motor sports. Racingsm software has features for many different areas 2stroke exhausts development, drag racing features, simulators, carburetor tuning, connectingrod analysis etc with all this knowhow along. This power delivery can be akin to a twostroke where the engine needs to be kept on the pipe, or in the narrow powerband to be driven effectively. We also have a simple 2stroke expansion chamber design program.
But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. Two stroke engine and exhaust design software north. There is a huge interest in vintage snowmobiles and their simple two stroke power plants of yesteryear. After our trial and test, the software was found to be official, secure and free. Software for fine tuning and design of two stroke engine by. Engineering acousticssonic supercharging of 2 stroke engines.
You should try contact wayne wobbly wright he is the master of engmod, he posted recently a dyno sheet of rd400 developed by him in engmod for land speed racing hp on petrol. Our heads cool the piston better, prevent detonation, and. A simple 3 stage two stroke exhaust calculator based on formulas of g. Two stroke exhaust pattern if i were doing this the first thing i would do is model the entire design as a single solid body no wall thickness, no separate components.
The exhaust tuning of a 2 stroke is designed to preserve the positive pulse going down the pipe and reflect that positive pulse back up the pipe. It is the holy grail of experimental tuning of more than just 2 cycle. I didnt like bimotions pipe design software so i bought and used yours. They are so simple and fun that ive always enjoyed tinkering with them. May 03, 2018 how to design a two stroke expansion chamber performance exhaust step 2. 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. Two stroke engine and exhaust design software post by dawid. The intent of the competition is to provide universities with an. You should try contact wayne wobbly wright he is the master of engmod, he posted. 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.