The story goes, his brother in law and family were all over his house this past weekend. We will include automatic pipe squelton and cad support in order to have. You can also save and load the data by using the provided functions. Bimotion 2 stroke software has been commercially available and in professional use since 1991. 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. Expansion chamber exhaust design software i have just bought and installed this 2 stroke wizard tuned pipe expansion chamber design software package.
Kaaden understood that there was power in the sound waves coming from the exhaust system, and opened up a whole new field in two stroke theory and tuning. Calculate the needed exhaust and transfer port durations to match the desired peak power rpm. It was nice outside, so the bil and my coworker decided to go out and do. Using apkpure app to upgrade 2 stroke exhaust calculator, fast, free and save your internet data.
North american twostrokes general two stroke discussion. We now have a simple 2 stroke expansion chamber design program. This is not a rehash of the old outdated port timearea formulas but rather it relies on the true blowdown time the time it takes for the exhaust pulse to go. Two stroke engine and exhaust design software page 2. It is designed to make it easy to test different approaches of tuning degrees and usage of bimotions input editor for the simulation program modelno2. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at. This coefficient kh is called the horn coefficient, with typical values between one and two. An engines exhaust port can be thought of as a sound generator. The description of 2 stroke exhaust calculator a simple 3 stage two stroke exhaust calculator based on formulas of g. How to bend a conetwo stroke pipe model solidworks forums. This program calculates the dimensions for both double and triple stage diffuser expansion chambers from a few basic engine dimensions. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. 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. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2 stage or 3stage diffuser.
A simple 3 stage two stroke exhaust calculator based on formulas of g. In short, the expansion chamber creates a pump, by using the momentum and pressure of the exhaust gases, and squeezes more air and fuel into the cylinder during the intake stroke. Two 2 stroke exhaust expansion chamber calculator using 3 methods. Our example has an after market 50cc performance cylinder with a bridged exhaust port. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. Two stroke design software the following are spreadsheets for different aspects of 2 stroke design modification. The measurement required is the vertical distance from the crankshaft axis to the top edge of the exhaust port. The inputs will be engine specification and the outputs will be pipe dimensions. Method 1 and method 2 two and three stage diffuser. In a 2 stroke, we want to maximize the retention of that finite fuel charge. There are many ways to boost the power, one of which is by installing a tuned pipe. This small java applet uses design rules according to, and, to size a tuned pipe for a 2 stroke piston engine.
Two stroke cylinder porting tips watch this before you start cutting. Free 2 stroke expansion chamber calculator software update. Split your calculated 2 stroke exhaust up to 42 sections with regular length or even more with irregular lengths. The expansion chamber program will guide you to design a basic well working pipe. How a 2 stroke works your 2 stroke motor is an air pump. Type in the duration eg 180, and the program calculates all the other variables. Design and simulation of two stroke engines gordon p. Top of exhaust port location entering a value for this parameter will produce exhaust timing figures. Look very good and i understand this program gave excellent performing pipes to others.
New feature of racingsm software, the 2 stroke exhaust segment splitter. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. The objectives of this project are to study, develop and maybe sell a software for pipe designing. 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. They are so simple and fun that ive always enjoyed tinkering with them. Here is the official description for 2 stroke wizard tuned pipe.
The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. It requires values for stroke, piston height, conrod length, and wrist pin offset. Assign fixed relationships between transfers and exhaust port. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design mota and the new motax. How to pick the best 2stroke exhaust for your dirt bike. The worlds leading 2stroke engine simulation software for 3.
Just a quick update on the progress of the freeware 2 stroke expansion chamber calculator software. Four 4 stroke exhaust pipe calculator download apk free. This phenomenon was first discovered in the 1950s by walter kaaden, who was working at the east german company mz. This app can be use for finding inside diameter and length of four 4 stroke exhaust pipe with specifictype of an engine e. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. In a two stroke 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. Twostroke waveaction engine simulation motion software. The revisions were to be so extensive on the authors the basic design of two stroke engines that what was to be a second edition evolved into a new book. Two stroke engines often have a high powertoweight ratio, power being available in a narrow range of rotational speeds called the power. Dirt bike home dirt bike parts exhaust 2 stroke exhausts due to the covid19 virus shipping may be delayed and some shipping methods are not available 2 stroke dirt bike exhausts. In the design form first select the water cooled and reed induction options from the dropdown menus.
A 2 stroke is different of course since there is only a finite amount of fresh mixture available in the crankcase to be transferred up into the cylinder. Pro circuits clearance corner holds many products from 2 stroke exhaust, graphic kits, engine parts to apparel, all at discounted prices. After our trial and test, the software was found to be official, secure and free. Dedicated to the free exchange of information among two stroke road racing motorcycle enthusiasts around the world. Two 2 stroke exhaust expansion chamber calculator apps on. Improve the performance of your two stroke engine with a torqsoft designed exhaust system. I know the less exhaust pipe curves the better and where it does curve try and make them long and flowing. Calculates port heights from durations, or durations from port heights. So, i got a gas powered 2 stroke craftsman leaf blower for free from a coworker. Performance fabrications is dedicated to manufacturing the finest bespoke hand crafted exhaust systems available. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly.
Torqsoft twostroke exhaust system designer programme. Two stroke engine and exhaust design software north. My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. This is the place to talk about anything related to two stroke road race bikes. We shall send you a pdf document with the templates for manufacturing your exhaust. The way a two stroke motor works causes them to be f. Exhaust designer programme 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 2 stroke exhaust system uses an expansion chamber the prominent bulge in the exhaust pipe to increase the engines horsepower. Two stroke tuners handbook 2 another mistake commonly made, sometimes even by those who have enjoyed some success in modifying two stroke engines, is to believe in a kind of mechanistic magic. How twostroke expansion chambers work, and why you should. These bikes has been known to punch out big hp with twin carbs and exhaust.
The software does complete cycle simulation of the whole internal combustion process including the gasdynamics in the pipesducts, ports and plenums air boxes, boost bottles, exhaust boxes etc. I tried a few free ones, but the first attempt at making a pipe from those didnt. Engineering acousticssonic supercharging of 2 stroke. For 4t the free lotus singlecylinder engine simulation is supposed to be quite good but like engmod it wants a lot of data to be gathered and entered. Bigger carburetors, higher compression ratios, altered port timings and expansion. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users.
Free 2 stroke exhaust expansion chamber calculator youtube. Good evening folks, i have been trying to make a two stroke exhaust, and would like to use solidworks to curve all the conic sections, because doing this. Free 2 stroke exhaust expansion chamber calculator. For introductory material on 2 stroke engines please see the following links. For a 2 stroke with expansion chamber and no boost bottle then everywhere. The official home page of our 2 stroke wizard tuned pipe. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you.
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