2 stroke expansion chamber software

What will a two stroke run like without an expansion chamber. Fourstroke expansion chambers general dirt bike discussion. Performance fabrications is dedicated to manufacturing the finest bespoke hand crafted exhaust systems available. Everything2stroke forum since 2004 a forum community dedicated to all 2 stroke engine vehicle owners and enthusiasts. My professional 2 stroke expansion chamber design software is more sophisticated than other programs that only use a few basic formulas. Bigger carburetors, higher compression ratios, altered port timings and expansion. Engineering acousticssonic supercharging of 2 stroke engines. 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. You know that changing the exhaust pipes on your two stroke motorcycle can have a marked effect on the engines power characteristics, but do you know why. Courtesy of scott ilkes and the pat willey collection.

In a four stroke engine, there is only one working stroke against three negative strokes induction, compression, and discharge. Has anyone experimented with varying the diameter of the tailpipe section including silencer to dial in a 2 stroke pipe. Everything you always want to know about pipes but were afraid to ask. There are many ways to boost the power, one of which is by installing a tuned pipe. The bmep value will provide an indication of the average exhaust gas temperature we need to. In a two stroke engine, every stroke leaving top dead center is an expansion stroke i. Two stroke tuning by alexander graham bell excellent book. We also have a simple 2 stroke expansion chamber design program. But im curious as to how an expansion chamber would affect a four stroke engine. How to design a two stroke expansion chamber performance. Jan 28, 2011 i bought an expansion chamber design program, and it produced numbers more in line with what i though i should have from what ive been reading.

I got sick of the silly free programs and the expensive for sale programs and that wasteoftime 2 stroke wizard and so made my own expansion chamber calculator spreadsheet. They are so simple and fun that ive always enjoyed tinkering with them. Buy 47cc 49cc 2 stroke engine pocket bike mini quad exhaust pipe muffler with expansion chamber. The expansion chamber will give your 48cc or 6680cc 2 stroke motorized bike engine some bottom end torque and added top end speed by allowing the air to circulate better within the chamber, you exhaust will run more smoothly to give you better pull and faster speed. 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. Method 1 and method 2 two and three stage diffuser.

Enthusiasts, tuners, mechanics, gp, drag racing, mx, enduro. Ask our shadetree mechanics 2 stroke wizard pipe builder. Free 2 stroke exhaust expansion chamber calculator youtube. Just a quick update on the progress of the freeware 2 stroke expansion chamber calculator software. Just a quick update on the progress of the freeware 2 stroke. 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 2 stroke engine cycle the characteristic feature of the two stroke engine is its means of operation. Dec 17, 2019 the official home page of the 2 stroke wizard tuned pipe 4t exhaust header wizard software.

I have plans this winter to put my yz 125 motor in it but i would like to see how this little motor runs with a good pipe vs the stock one that i. Nov 02, 2019 for introductory material on 2 stroke engines please see the following links. Small values of kh are best suited to grand prix engines with narrow power bands, larger. Jan 23, 2019 2 stroke exhaust expansion chamber calculator using 3 methods. Free 2 stroke exhaust expansion chamber calculator duration. This coefficient kh is called the horn coefficient, with typical values between one and two. Mufflers free delivery possible on eligible purchases.

How twostroke expansion chambers work, and why you should care. Without a pair of really good chambers you will never get much power from you rd 350 ypvs. However, the wave may also suck fresh mixture out the exhaust port into the header of the expansion chamber. Here is the official description for 2 stroke wizard tuned pipe. Varying 2stroke stinger diameter motorcycle engineering. File type pdf two stroke engine expansion chamber design software 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. Do it right by doing it yourself this screenshot is sheet 1 of 4 sheets. This program calculates the dimensions for both double and triple stage diffuser expansion chambers from a few basic engine dimensions.

Two stroke engine expansion chamber design software. Free 2 stroke expansion chamber calculator software update. Alternatively, any one section may be selected and patterns suitable for the construction of an equivalent bend section printed this new feature allowing creation and printing of expansion chamber sections. After our trial and test, the software was found to be official, secure and free. The books ive read seem to indicate a tradeoff between enhanced pipe action and power output reducing diameter and motor overheating with a toosmall pipe has anyone fou. Twostroke waveaction engine simulation motion software. Im building a little street legal 30s style hillclimber out of a 73 dt1250. The program takes your info and spits out a sheet with lengths and diameters. The official home page of our 2 stroke wizard tuned pipe.

Developed by pedro, with more than 20 000 lines of code, all the knowhow applied to software comes from us and also a lot from the legendary portuguese 2 stroke tuner lufo racing, this software is directed for all 2 stroke. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2 stage or 3stage diffuser. Two stroke engine and exhaust design software north. Expansion chamber with muffler motorized bike, 66cc, 48cc 2.

Free 2 stroke expansion chamber calculator software update duration. Bimotion 2 stroke software has been commercially available and in professional use since 1991. As you can see, modern two stroke expansion chambers create a complex scenario and are quite difficult to tune. The chambers is the single most important thing when it comes to tuning the 2 stroke engine. 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. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Building your own racing expansion chambers rdrz 350 ypvs why should i even bother making them. The stock pipe is basically a straight pipe anyway but i want to pit a straight pipe on it with a new. Simply put, its because the twostroke exhaust system, commonly referred to as an expansion chamber uses pressure waves emanating from the combustion chamber to effectively supercharge your cylinder. Jan 15, 2005 ok, i had a question up a week or two ago about why two strokes have their expansion chambers in the pipes. When the transfer is complete, the piston is on the compression stroke but the exhaust port is still open, an unavoidable problem with the two stroke piston port design. The official home page of the 2 stroke wizard tuned pipe 4t exhaust header wizard software. Free expansion chamber design utility download expansion.

Simply put, its because the two stroke exhaust system, commonly referred to as an expansion chamber uses pressure. You can also save and load the data by using the provided functions. How twostroke expansion chambers work, and why you should. The way a two stroke motor works causes them to be f. We now have a simple 2 stroke expansion chamber design program. Unique, modern, user friendly and in depth programs very fast and efficient design tool educational with embedded recommendations covers from small scooter 50cc to big bore race 500cc. Come join the discussion about your favorite engines performance, classifieds, troubleshooting, maintenance, and more. A simple 3 stage two stroke exhaust calculator based on formulas of g.