2 stroke exhaust design software

This is the place to talk about anything related to two stroke road race bikes. Near the end you will be presented with the latest and best software for design and analysis of 2 stroke pipes. 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. Exhaust pipe muffler for 2 stroke 47cc 49cc engine mini pocket bike condition. 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. Ten things you need to know about mufflers motocross action. Download it here go to the 2t exhaust calc menu item. 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. However, you shouldnt just pick any business that you can find anywhere. Pro circuit has built a reputation around our exhaust systems. Split your calculated 2 stroke exhaust up to 42 sections with regular length or even more with irregular lengths. North american two strokes general two stroke discussion. Those of us who have grown up in the japanese twostroke.

Improve the performance of your twostroke engine with a torqsoft designed exhaust system. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine. The one i have been using is call mota, from ian williams tuning. Crankcasecompression two stroke engines, such as common small gasolinepowered engines, are lubricated by a petroil mixture in a totalloss system. This program calculates the dimensions for both double and triple stage diffuser expansion chambers from a few basic engine dimensions. I found most other software work on outdated blair and jennings formulas. 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. 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.

Two stroke engine and exhaust design software post by oldjohnno. Yellow the exhaust duration, and blue the transfer port duration. Assign fixed relationships between transfers and exhaust port. The bmep value will provide an indication of the average exhaust gas temperature we need to calculate tuned length of the epxnasion chamber exhaust, as well as providing a guide to the pipe mid. The pipe builder would make a pipe as the program dictated and then chunk the.

The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. Free 2 stroke expansion chamber calculator software update. We offer twostroke exhaust for all of the popular motorcycles and atvs. The cylinder pressure drops, and the fresh charge transfers thru the transfer ports, over the top of the piston, and out the. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Mufflers free delivery possible on eligible purchases. Nov 05, 2011 a simple 3 stage two stroke exhaust calculator based on formulas of g. It is also very good for expansion chamber designs.

Design and create exhaust tubes around axles, mufflers, gas tanks, and etc. We use computer design software to maximize power and torque at any elevation. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. Two stroke engine and exhaust design software north. I bought this spark arrestor for my 2019 husqvarna te 250i and it fit perfectly and sounds great and its us forest service approved. Twostroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. 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. In order to linearize the engine power curve flatten the torque curve there has been widespread usage of the 4 2 1 design described above in the cup section. 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.

They are so simple and fun that ive always enjoyed tinkering with them. 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. But because of the limited worldwide activity in twostroke engine development, program. A two stroke pipe uses its reflective pressure wave to keep the fuelair mixture inside the combustion. We shall send you a pdf document with the templates for manufacturing your exhaust. Performance fabrications is dedicated to manufacturing the finest bespoke hand crafted exhaust systems available. Its ironic, but a single cylinder 2 stroke engine is actually wider than it is tall. A twostroke pipe uses its reflective pressure wave to keep the fuelair mixture inside. 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. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed.

Test your own theories on porting and exhaust pipe design. Any donations greatly appreciated, please use paypal link. A complete two stroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. Here is the official description for 2 stroke wizard tuned pipe. May 03, 2018 the bmep value will provide an indication of the average exhaust gas temperature we need to calculate tuned length of the epxnasion chamber exhaust, as well as providing a guide to the pipe mid. The main interface of bendtech exh gives you the ability to recreate the critical components of a vehicle axles, mufflers, gas tanks, etc and then properly route the tubing around them. 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. Then the software will provide necessary bending instructions such as length, rotation, and angles, of the tubes with accurate exhaust tube bending and fabricating. After our trial and test, the software was found to be official, secure and free. Jan 22, 20 two stroke engines have different exhaust systems, but the basic muffler design is similar. My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. North american twostrokes general two stroke discussion two stroke engine and exhaust design software 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. Two stroke engine expansion chamber design software unlocking the secrets of 2 stroke expansion chamber exhausts e1 this is the first video in a series looking at the science and mysteries of 2 stroke expansion chamber exhausts.

So overlap merely takes advantage of the inertia of the exhaust gases and the lowpressure region that it produces near the exhaust valve at the end of the exhaust stroke. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you. We also have a simple 2stroke expansion chamber design program. 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. Engineering acousticssonic supercharging of 2 stroke engines. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine. This coefficient kh is called the horn coefficient, with typical values between one and two. Then you can start reading kindle books on your smartphone, tablet. How to design a two stroke expansion chamber performance.

Bmep hp x 6500 l x rpm 2 stroke l engine size in liters. I do not like the ultralight designs that have the pipe just hanging in the breeze. Method 1 and method 2 two and three stage diffuser. The following are spreadsheets for different aspects of 2 stroke designmodification. New feature of racingsm software, the 2stroke exhaust segment splitter. 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. How 2stroke exhaust pipes work offroad engineered if you ride a dirt bike, you most likely.

Improve the performance of your two stroke engine with a torqsoft designed exhaust system. Dec 28, 2015 north american twostrokes general two stroke discussion two stroke engine and exhaust design software this is the place to talk about anything related to two stroke road race bikes. Exhaust and intake tuning building, tips and techniques. New feature of racingsm software, the 2 stroke exhaust segment splitter. I wanted to design the cheek cowls such that it would streamline the carburetor and air filter and the the exhaust. Two stroke engine expansion chamber design software. The official home page of our 2 stroke wizard tuned pipe. Dec 17, 2019 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. 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.

In a two stroke engine, the exhaust gasses transfer less heat to the cooling system than a four stroke, which means more energy to drive the piston and, if present, a turbocharger. You can also save and load the data by using the provided functions. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2stage or 3stage diffuser. Two stroke engine and exhaust design software post by ede. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly.

There are many ways to boost the power, one of which is by installing a tuned pipe. Twostroke engines have different exhaust systems, but the basic muffler design is similar. You can also save and mota software, 2 stroke engine simulation software, 2. There are a few software programs available for 2 stroke simulations. 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. Small values of kh are best suited to grand prix engines with narrow power bands, larger. Split your calculated 2stroke exhaust up to 42 sections with regular length or even more with irregular lengths. Computer software can help you with the design, but dont expect super design from the software.

Brakes, and other metalworking toolssafe work ethicunderstanding of 2 stroke enginesability to use expansion chamber design software. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. 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 back into the motor at low rpm shorter, but thats just my totally nonexpert opinion. The way a two stroke motor works causes them to be f. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy. Nov 02, 2019 for introductory material on 2 stroke engines please see the following links. For introductory material on 2 stroke engines please see the following links. Twostroke waveaction engine simulation motion software. Specificaly written for gokarts engines, but will do any 2 stroke. This small java applet uses design rules according to 22, 23, and 24, to size a tuned pipe for a 2 stroke piston engine. 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 businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. You should only rely on the experience of the very best.

Small values of kh are best suited to grand prix engines with. There are pipes and silencers for racing, recreation, quiet riding and even usfs approved spark arrestors. The exhaust system of a car is one of the most commonly modified areas when a. Two stroke engine and exhaust design software page 2. To achieve high bmep numbers, all parts of the 2stroke cycles must be optimized. As the forces in a twostroke 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. Varying 2stroke stinger diameter motorcycle engineering. Enter your mobile number or email address below and well send you a link to download the free kindle app. How twostroke expansion chambers work, and why you should care. How 2 stroke exhaust pipes work offroad engineered if you ride a dirt bike, you most likely. Racingsm software 2stroke exhaust calculator lufo youtube. A performance exhaust system is a characterizing element for any internal combustion conveyance. For port work, one company that will help you is 2strokeporting.

Apr 28, 2015 the uneven spacing of exhaust pulses requires some outofthebox thinking to gain benefit from exhaust tuning. Buy 47cc 49cc 2 stroke engine pocket bike mini quad exhaust pipe muffler with expansion chamber. Calculates port heights from durations, or durations from port heights. 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. A complete twostroke pipe has properly tuned header, convergent, belly, divergent and stinger sectionsa difficult process. This expansion chamber is not the product of simple correlations as for other products that abound on the web, but an automatic design created by mota which is a full wave action 2 stroke engine simulator. Engineering acousticssonic supercharging of 2 stroke. Design and simulation of two stroke engines gordon p.