Two stroke exhaust design software

This coefficient kh is called the horn coefficient, with typical values between one and two. Simply overlay the supplied pdf templates on mild steel sheet and cut the metal section using tin snips. Once again before i start thanks to the author of the website. Racingsm software 2stroke exhaust calculator lufo youtube. He is a master pipe welder and has software based on the engine parameters that will make a pipe that will work. The intent of the competition is to provide universities with an. The higher the rpm we design for, the greater the intake and exhaust overlap we build into the cam lobes. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine. It is also very good for expansion chamber designs. Improve the performance of your two stroke engine with a torqsoft designed exhaust system. Two stroke engine and exhaust design software page 2. 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. This small java applet uses design rules according to 22, 23, and 24, to size a tuned pipe for a 2 stroke piston engine.

For port work, one company that will help you is 2 stroke porting. Direct comparison between different types of exhausts for the two stroke engine, on the left you can see the engine and its exhaust, in the. Exhaust tuning theory and system design weve all heard the magazines talk about back pressure and most of what they say is utter cac so how do we ensure we have a good, efficient, exhaust system bearing in mind that back pressure, any back pressure, is a. Two stroke engines often have a high powertoweight ratio, power being available in a narrow range of rotational speeds called the power. Small values of kh are best suited to grand prix engines with narrow power bands, larger. Many had crankcases that were not part of the induction system and they had intake vales but the exhaust was a port in the cylinder wall, most required a blower to run. Two stroke design software the following are spreadsheets for different aspects of 2 stroke design modification. How to design a two stroke expansion chamber performance exhaust step 6 duration. How eccalc agrees with the real life exhaust pressure graphs from blair. I guess 2 stroke exhaust system design is all about tradeoffs, and i. This v4 576cc features a double counter rotating crankshaft, an electronic fuel injection, 56 x 58. New feature of racingsm software, the 2 stroke exhaust segment splitter. The chambers is the single most important thing when it comes to tuning the 2 stroke engine. The one i have been using is call mota, from ian williams tuning.

Aussie twostroke engine invention motorbike writer. This program calculates the dimensions for both double and triple stage diffuser expansion chambers from a few basic engine dimensions. 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. However, you shouldnt just pick any business that you can find anywhere. Twostroke waveaction engine simulation motion software. All this is mated to an srt six speed cassette gearbox. The cylinder pressure drops, and the fresh charge transfers thru the transfer ports, over the top of the piston, and out the. Advanced twostroke 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.

Assign fixed relationships between transfers and exhaust port. The worlds leading 2stroke engine simulation software for 3. There are pipes and silencers for racing, recreation, quiet riding and even usfs approved spark arrestors. In a twostroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust or scavenging functions occurring at the same time. Exhaust and intake tuning building, tips and techniques. Two stroke engine and exhaust design software north.

The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. This software covers the 3 stage diffuser type expansion chamber exhaust as per equations provided in his book entitled design and simulation of two stroke engines published in 1996. Here is the official description for 2 stroke wizard tuned pipe. Once i have that completed i would understand the geometry that i need and have an envelopescaffold defining the geometry. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at.

Everything2stroke forum since 2004 a forum community dedicated to all 2 stroke engine vehicle owners and enthusiasts. Improve the performance of your two stroke engine now with these pre designed exhaust plans. A complete two stroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. They are so simple and fun that ive always enjoyed tinkering with them. By rayivers, november 5, 2009 in motorcycle engineering. But the real star of the show is its heart, the high tech two stroke engine. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine.

North american two strokes general two stroke discussion. That part of the overlap design is common to all 4 stroke engines in order to gain additional charging of the cylinder with fuel mix at high rpm. How twostroke expansion chambers work, and why you should. On a two stroke engine, an expansion chamber or tuned pipe is a tuned exhaust system used to enhance its power output by improving its volumetric efficiency. I found most other software work on outdated blair and jennings formulas.

My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust. Thanks to the software 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. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you. How to design a two stroke expansion chamber performance exhaust step 2. For introductory material on 2 stroke engines please see the following links. A performance exhaust system is a characterizing element for any internal combustion conveyance. Specificaly written for gokarts engines, but will do any 2 stroke.

Split your calculated 2 stroke exhaust up to 42 sections with regular length or even more with irregular lengths. The official home page of our 2 stroke wizard tuned pipe. Without a pair of really good chambers you will never get much power from you rd 350 ypvs. How to design a two stroke expansion chamber performance. The suter mmx 500 racing motorcycle is an impressive beast. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust. Defining the acoustic profile and influencing the powerband exhaust design is a more dynamic science than stringing together a few pipes and tacking on some mufflers. Performance fabrications is dedicated to manufacturing the finest bespoke hand crafted exhaust systems available. Software for fine tuning and design of two stroke engine. For a 2 stroke engine the tuned pipe is the section of the exhaust system that 2 stroke wizard tuned pipe design software ian williams tuning 15 replies. There are a few software programs available for 2 stroke simulations.

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. Calculates port heights from durations, or durations from port heights. You should only rely on the experience of the very best. Near the end you will be presented with the latest and best software for design and analysis of 2 stroke pipes. This is the place to talk about anything related to two stroke road race bikes. A simple 3 stage two stroke exhaust calculator based on formulas of g. We shall send you a pdf document with the templates for manufacturing your exhaust. 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. The compromises in the 2 stroke design to be cleverly efficient in producing power pulses eliminates the opportunity to do the things. The way a two stroke motor works causes them to be f. Design and simulation of twostroke engines is a unique handson information source. 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. You can also save and load the data by using the provided functions.

Free 2 stroke expansion chamber calculator software update. Engineering acousticssonic supercharging of 2 stroke. We use computer design software to maximize power and torque at any elevation. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly.

Come join the discussion about your favorite engines performance, classifieds, troubleshooting, maintenance, and more. If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy. The pipe builder would make a pipe as the program dictated and then chunk the. There are many ways to boost the power, one of which is by installing a tuned pipe. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design.