2 stroke exhaust silencer design software

Direct comparison between different types of exhausts for the twostroke engine, on the left you can see the engine and its exhaust, in the. Ten things you need to know about mufflers motocross action. Follow the link to my software site and go to the 2t exhaust calc menu item and download either the stand alone program or a installer package. Split your calculated 2 stroke exhaust up to 42 sections with regular length or even more with irregular lengths. Two stroke tuned pipe theory as applied to model boats. Dans motorcycle two stroke motorcycle exhaust pipes. These characteristics impose severe limitations on what can be done to silence the engine exhaust noise. Pit posse pp2572 motorcycle dirt bike atv 2 stroke muffler. In his design and simulation of two stroke engines, in chapter two entitled gas. Computer software can help you with the design, but dont expect super design from the software. There are many ways to boost the power, one of which is by installing a tuned pipe.

Home ktm store ktm offroad powerparts exhaust 2 stroke. Small values of kh are best suited to grand prix engines with narrow power bands, larger. 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. In the early days of 2 stroke diesel development a number of cute tricks were invented to address both issues and theyve been used by hot rodders on 2 stroke and 4 stroke gas and diesel ever since. The exhaust pipe of a two stroke engine attempts to. Mota will accept a singlecylinder design, which will also cater for many multis where 2, 3 or more cylinders of the same basic layout are repeated. It endeavors to provide the products that you want, offering the best bang for your buck. I found most other software work on outdated blair and jennings formulas.

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. Plot two concentric circles having the same center using the two radii r. This means that to run motax, you will need a post 2010 computer which is preferably a desktop, driven by an intel i7 4core processor. Many rc 4stroke engines arent bothered as much by mufflers or not usually the muffler only kills power by 200400rpm unlike a 2stroke as was mentioned previously. The present paper deals with an automotive muffler that is modeled based on practical dimensions of a 4 stroke 2 cylinder mahindra maximo plus c. Plus it was nice and quiet, but still maintained a good bark. Freeware 2 stroke expansion chamber exhaust calculator program. Dec 11, 2018 freeware 2 stroke expansion chamber exhaust calculator program. Reactive silencer design is based either on the principle of a helmholtz resonator or an expansion chamber, and requires the use of acoustic transmission line theory.

It is the 250cc to 500cc sized bikes that have seen a marked increase in second hand values. Performance fabrications is dedicated to manufacturing the finest bespoke hand crafted exhaust systems available. Flow restriction from the silencer, if not a completely flow through design. They are so simple and fun that ive always enjoyed tinkering with them. 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. A one cylinder water cooled kx80 kawasaki dirt bike motor being used in a fun scooter project. Gnarly pipe and turbinecore 2 silencer restoring a 2006 suzuki rm 250, the pipe and exhaust make it look track ready. A two stroke pipe uses its reflective pressure wave to keep the fuelair mixture inside. A practical approach towards muffler design, development. Thermal zero mpk1 ceramic muffler packing material kit for 2stroke 4stroke atv motorcycle dirt bike exhaust silencer spark arrestor muffler packing repack universal wrap. Jul 28, 2018 making a simple packingbased muffler for an older two stroke motorcycle. Reactive silencer design is based either on the principle of a helmholtz resonator or an expansion chamber, and. When i bought my 250 from the previous owner, it came with a procircuit woods exhaust, 296, and the bike was very smooth and was very easy to ride in the woods at my house. On a twostroke engine, an expansion chamber or tuned pipe is a tuned exhaust system used to enhance its power output by improving its volumetric efficiency.

Two stroke engines have different exhaust systems, but the basic muffler design is similar. Two stroke engine and exhaust design software north. 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. There are pipes and silencers for racing, recreation, quiet riding and even usfs approved spark arrestors. Ktm, husaberg, husqvarna 2stroke silencer spark arrestor end cap.

My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. Ten things you need to know about mufflers motocross. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you. Ktm, husqvarna tpi 2 stroke silencer spark arrestor end cap. Near the end you will be presented with the latest and best software for design and analysis of 2 stroke pipes. Shorty vs longer silencer honda 2 stroke thumpertalk. Bigger carburetors, higher compression ratios, altered port timings and expansion. New feature of racingsm software, the 2 stroke exhaust segment splitter. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. Flow restriction from the silencer, if not a completely flowthrough design, contributes to total exhaust restriction and to back pressure which restricts the engine a bit. Engineering acousticssonic supercharging of 2 stroke engines. He reportedly said youll know when you have the design right, because the chamber will then be impossible to fit on the motorcycle without having it drag the ground, burn. The way to calculate the return timing and length of the negative wave in a 2 stroke.

As indicated in an earlier post, proper exhaust design is critical for 2stroke engines, and not unimportant for 4 strokes. This is not a howto video, but a video here for entertainment only. Engineering acousticssonic supercharging of 2 stroke. How twostroke expansion chambers work, and why you should. Read my expansion chamber theory page to get a full understanding of how expansion chambers work and click here to read more of the details of this spreadsheet calculator. Split your calculated 2stroke exhaust up to 42 sections with regular length or even more with irregular lengths. Jan 19, 2008 i use tsr hemihead, squish and degreeit. Simulation of engines with either a box silencer or an expansion chamber is also. I think mota is a good program for the money, but dont think the results from any engine modeling program are carved in stone.

We shall send you a pdf document with the templates for manufacturing your exhaust. Free 2 stroke exhaust expansion chamber calculator youtube. We offer twostroke exhaust for all of the popular motorcycles and atvs. The basics are assumed, such as port matching and radiused flow paths. In this video series premiere, we start the process of building a two stroke expansion chamber from parts. However there is no direction connection between the inlet and the outlet so back pressure is generated that can effect engine performance. The present paper deals with an automotive muffler that is modeled based on practical dimensions of a 4stroke 2cylinder mahindra maximo plus c. Many rc 4 stroke engines arent bothered as much by mufflers or not usually the muffler only kills power by 200400rpm unlike a 2 stroke as was mentioned previously.

Excessive exhaust restriction also adds to engine heat. May 25, 2012 in the early days of 2 stroke diesel development a number of cute tricks were invented to address both issues and theyve been used by hot rodders on 2 stroke and 4 stroke gas and diesel ever since. This involves careful planning out of the design of the pipe. That is because the pressure wave created when the exhaust suddenly enters the. The way a two stroke motor works causes them to be f. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at the end of the converging section. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly. Pro circuit has built a reputation around our exhaust systems. Torqsoft twostroke exhaust system designer programme. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine. Test your own theories on porting and exhaust pipe design. Two stroke engine and exhaust design software post by oldjohnno. Contrary to reducing performance, a certain amount of restriction in exhaust systems can enhance power curves.

Enter your email address to receive special offers and promotions. In the design form first select the water cooled and reed induction options from the dropdown menus. Hence, more people are now looking at restoring and tuning these bikes. Ktm, husqvarna tpi 2stroke silencer spark arrestor end cap. Processors with a lower number of cores will run the motax expansion chamber optimiser, as will the latest. For example my suzuki 100 gained 10kph more top speed when the silencer was removed. This coefficient kh is called the horn coefficient, with typical values between one and two.

This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. Two stroke engine and exhaust design software post by oldjohnno sat jan 16, 2016 8. You can also save and load the data by using the provided functions. If the op wants to copy a good aftermarket type exhaust, try making your own version of the turboheader mufflers. How to design a two stroke expansion chamber performance. 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. Making a simple packingbased muffler for an older two stroke motorcycle. If you want to buy cheap 2 stroke muffler, choose 2 stroke muffler from. Whatever 2 stroke muffler styles you want, can be easily bought here.

A leader in our industry, we know youll be satisfied with your 2stroke silencers when you buy from us. A complete two stroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. A practical approach towards muffler design, development and. An investigation into formula sae performance exhaust design and analysis. 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. 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. The exhaust designer programme enables the user to design a twostroke 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 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. The sst is meant for top end power but your shorty silencer is meant for bottom end power we suggest changing your silencer to a powercore 2 which makes great power through the. Thermal zero mpk12 ceramic muffler packing material kit for 2 stroke 4 stroke atv motorcycle dirt bike exhaust silencer spark arrestor muffler packing repack universal wrap 3.

Nov 02, 2019 for introductory material on 2 stroke engines please see the following links. We offer two stroke exhaust for all of the popular motorcycles and atvs. Improve the performance of your two stroke engine with a torqsoft designed exhaust system. This is sometimes referred to as a baffled muffler design. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at. New feature of racingsm software, the 2stroke exhaust segment splitter. As indicated in an earlier post, proper exhaust design is critical for 2 stroke engines, and not unimportant for 4 strokes. For introductory material on 2 stroke engines please see the following links. Simulation of engines with either a boxsilencer or an expansion chamber is.