Spray a full can into the inlet side of the expansion chamber and let it sit and soak into the baked on carbon. Amazon's Choice for 2 stroke expansion chamber. The books I have are: The High Performance Two Stroke Engine, DR. Aug 11, 2023 · How to build a 2 stroke expansion chamber? new updatePlatinum stroke pipe two aftermarket larger click. There are a number of resonances that occur inside 2 stroke expansion chamber performance exhausts. In addition, they force unburned fuel/air back into the combustion chamber on the compression stroke. This video explains why that is and how the timing of both c Dec 9, 2017 · How the diffuser and baffle cone taper angles are calculated for straight or multi tapers. Let it sit for at least a full 10 minutes while you keep moving the pipe around in new positions. 166 x 2. NOTE:Chambers might slightly interefere with bike's frame caused by indivisual frame difference. The expansion chamber doesn't need to be straight. Feb 6, 2014 · heavy load 12-13. 2 into 1 system listed will not fit for sure. Cm = 0. This video covers the intro to the proc Expansion chambers were invented and successfully manufactured by Limbach, a German engineer, in 1938, to economize fuel in two stroke engines. The main action of an expansion chamber is the creation of reverse waves (returning to the cylinder) that happen from the main pressure wave in it expanding and then contracting at the diffuser and baffle cones. Some additional degradation of the peak pressure at the shock front occurs as the front expands into the chamber and reflects from the walls Sep 17, 2009 · Posted September 18, 2009. Start by cutting the tire valve out of the tube and leave about a nickel sized worth of rubber on it. Hopefully some of you find this video i put together interesting, cheers and thanks for looking! Animation of a two-stroke engine. Two stroke bikes have been a passion for me from an Nov 11, 2017 · I attempt to clean the gunk and crap out of my trials bike expansion chamber. odf are probably best), or, if you're signed in to your Google account, save a copy to your Google Drive. Millions of fluid and thermo In the 2 stroke engine animation you can see the gases moving out of the exhaust at the same time new mixture is entering the cylinder. Jennings explains how to set stinger inside the chamber as Vannik says to quiet without losing power. In light of helping you , I'll provide you with the same formulae that I used to create tuned pipes for my 74 T500 (with a 72 top end and a whopping 60 horsepower!) Blair's Expansion Chamber Theory. John Dixon. May 24, 2018 · JDoidge92. Material: 19-gauge carbon 2-Stroke expansion chambers are designed and developed for each individual requirement and application, with the aid of our bespoke exhaust design Software and in-house load cell Dynamometer. Sep 9, 2017 · The way to calculate the return timing and length of the negative wave in a 2 stroke expansion chamber is by this formula: WRT1=(D1x2)/SW where WRT1 is the wave return time for the first part of the wave, D1 is the distance from cylinder port to beginning of diffuser, and SW is the speed of the wave which is determined by the temperature and Two Stroke Expansion Chamber Design. html Dec 13, 2018 · Less Noise, More Power - Expertly designed with a rear expansion chamber, this 2-stroke 47/49cc pocket bike exhaust can help lower noise while at the same time giving pocket bikes a power boost. An unexpected bonus was that the two stroke engines using tuned exhausts produced far more Primary Action. be/BGLsk0GZX8EThe program I use for the cone templates is Mota, ho The expansion chamber design software is used to design the tuned pipe for the exhaust system of the micro-car engine. Putting a divergent cone on the end of a straight pipe lengthens the returning wave, broadening the power band and creating a rudimentary expansion chamber. The expansion chamber in this position will give good all round performance. When you use an AFR in a 2 stroke you will work off the averages rather than the exact. 68. Do not do this indoors. . It’s a vulnerable component on every two-stroke dirt bike, and even reasonably small dents will significantly affect power. This section details the various parameters and design formulae, which have been implemented in the software You should see the math to build pipes. 2T Exhaust Calc is a Freeware program created to design a 2 Stroke engine performance exhaust system generally referred to as an "Expansion Chamber". Mar 9, 2022 · After every combustion stroke, the expansion chamber would suck the cylinder clean of spent exhaust gases. Buy It Now. So, to sum up, when the negative wave reaches the exhaust port at the correct MOTA is an engine simulation program suitable for everyone from the enthusiast to the university researcher – from the beginner racer to the professional tuner. Jun 17, 2011 · You start the engine and let it warm up, then set it at a high idle. dragonfly75. Jan 28, 2011 · Omicron Persei 8. I know that 2-1 pipes suck on shees, but that's cuz shee motors are all top end. May 27, 2024 · 25. Then you can test the pipe (s) with different lengths of center section. Cm = 4000 ft/min. The exhaust gas rushes out into the header pipe and a pressure wave is created. Mar 18, 2016 · The volume and shape of a two stroke expansion chamber are designed to reflect back and keep the intake air charge from blowing straight through the cylinder and out the exhaust port. com NOTE Software is now available for downloadDownload it here http://birdcagesoft. Jul 25, 2007 · Got this link from Andy pointing to a software program called, amazingly enough, “Cone Layout. The wave is first created when the exhaust blasts into the exhaust port. Shake it like hell for about 10 minutes and then let it sit for about 30 minutes. If you can fix them while you have other work done on the pipe I Apr 15, 2017 · The first video in probably 2 or 3. Finally, as the can nears empty, you spray it all in and if it kills the engine that's OK, if not just as it sprays out shut the engine down. Amazon. Expansion chambers can be easily tuned and customized to suit different engine specifications and applications, by changing the shape and the size of the pipe. Here are a few of the very basics regarding pipe design: Longer and larger head pipe (the 1st section) gives more low end. 0 / 6th April 2019. Barrel porting is a favored method of tuning pit bike engines. However, it is also likely that you don't fully understand how your bi Like a traditional expansion chamber, they also build back pressure to ensure engines get the boost of power you're looking. My preferred method was to heat a section of the pipe with oxy-acetylene when it starts to glow red turn off the acetylene and blow pure oxygen down the pipe and it will burn the crud out. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston in one revolution of the crankshaft. Aug 24, 2016 · Step 2. When combustion occurs in a two stroke, the piston is pushed down by the expanding gases uncovering the exhaust port. The first cone on the pipe helps scavenge the air mixture out of the crank case on top of the piston. Pressurizing the tank (to around 40-50 Psi) and applying heat to the dents pops them out quite nicely, I was really surprised! Seal off one end of the pipe. 4%. Custom 2 stroke pipesTwo-stroke pipe building information Restoring a 2 stroke pipe part 1Stroke two pipe motorcycle gp metal engine exhaust exhausts bike scooter work choose board models motorcycles bmw. cymotor2017 (8,963) 97. Slide the lower section about 20 mm over the end of the header pipe. Ezin Hobeki also has a program you can download as a demo that can create a FOS design chamber. com/T-shirts, hoodies, st Feb 8, 2011 · The bike is fitted with a two-stroke, 772cc parallel-twin (taken off a Polaris snowmobile!) that produces a massive 183 horsepower at 8,700rpm. Professor Blair's tests proved that the return waves timing can be calculated fairly closely using the straight distances and the pressure wave speed in the pipe for that distance. This is episode eleven of a series of videos documenting my experience building a performance oriented motorized bike using the standard 80cc 2-stroke eBay m A 2 stroke pipe guard protects the expansion chamber in 2 stroke dirt bikes from direct impact damage. 2 Stroke Exhaust Pipe Muffler with Expansion Chamber 47/49cc Engine Pocket Bike. You need to keep repositioning the pipe to get good coverage inside. Two Stroke Performance Tuning, A. Below is a drawing for the design to use. 1. Location: Denver 'Burbs, Colorado, USA. Sep 9, 2017 · extremeodd pretty much nailed it. Take about two or three cans of EasyOff and fill er' up, throw a few rocks in there and seal off the other end. The discussion is not complete. Then weld the cones to the middle cylinder, etc. Raising the exhaust port and transfer ports on a 2 stroke motor will typically raise the RPM at which peak engine power is produced. L is stroke, in inches. This wave can be either positive or negative in pressure. For my design software go to www. So now that you know how upgrading will improve the speed, sound, and performance of your engine, let's talk about the advantages of upgrading your 2-stroke motorized bike's exhaust. Apr 22, 2018 · This is a new series that provides step by step instructions for designing a tuned 2 stroke expansion chamber exhaust. The 2 stroke engine animation demonstration has an added device commonly known as an expansion chamber attached Nov 9, 2013 · DT200-2-THE-MAX. USA didn't get these bikes, but they are closely related to the WR200. html and to read May 15, 2019 · The wait is overIn a follow-up to the original video we posted about how to design and calculate an expansion chamber for a two-stroke motorcycle, we show Mar 17, 2014 · Instead of rolling the big straight section of the pipe according to the dimensions you got from a software program, fabricate it as a 2-piece straight section with snug-fitting but moveable inner and outer pieces. Expansion chambers are so named because of the volume they provide for the expansion of detonation gases behind the shock front as it enters the chamber from a connecting tunnel. These can be made interchangeable and used to Jun 14, 2021 · The 2-stroke exhaust system uses an expansion chamber - the prominent bulge in the exhaust pipe - to increase the engine's horsepower. Pre mix it first and use a potato as a plug. Alot of it's just simple math, measuring and pounding out the pipe shape. 5". Been out of print for many years. This video includes everything you need to know. The new R 1300 GS promises improvements across the board, and Akrapovič’s new exhaust system follows suit. 166 x L x N. 0mm for the stroke. https://www. On a 2 stroke, the way the exhaust works, the air in the expansion chamber can be very turbulant at certain rpm and throttle ranges. 5” Rubber stopper. In this article, we will explain why and when it makes sense to add extra Aug 22, 2018 · Deacrbinizing 2 stroke exhaust Jul 20, 2010 · I want to build a 3 into 1 chamber, but I can't find any theroy on it. Apr 1, 2009 · Building on its years of experience producing exhausts for the previous GS models, the company is able to exceed the expectations of the discerning BMW adventure rider. Many videos don’t show the process of buildi Jan 15, 2005 · Exhaust builders are messing with some really interesting ideas now that I haven't seen any theory on, liked stepped pipes and the use of internal rings or small expansion chambers in the header, so it gets deeper. It creates a vacuum pulling the air out of the case and through the transfers. That completes the chain of events for the basic two-stroke cycle. A simple, quick and cheap method is to remove pipe from bike (and muffler) and place a length of cable wire (old clutch or speedo) or the metal shroud that surrounds it 13. the 750 is all bottom and mid, plus it's not a good platform for 150 hp. 3mm for the bore and 39. 2 stroke wizard pro version 5 released!! To edit a copy of this document, go to File at the top left of the page, and either download a copy (. The effect of angles on the amplitude and wave length of the reflec of two main cylinders for combustion implementing a two-stroke cycle operation and a single help cylinder running at twice the engine speed. Jan 26, 2017 · Jimroid To the on ramp Posts: 309 Joined: Sun Feb 21, 2016 8:32 pm Country: USA Suzuki 2-Strokes: GT500 T500 GT750 Location: Pisgah Forest, N. C m = 0. com/motorbike/portsMS. He also proved that the return waves are generated all along the length of the diffuser and baffle cones. Then, before the next combustion cycle, it would draw fresh air and send it back into the Dec 17, 2017 · Now it's time to use the information and get into measuring up your 2 stroke expansion chamber to see if its right. As soon as you add 1 or 2 more cylinders to the mix, the soundwaves (for lack of a better explaination) begin to collide in a way that disrupts the The diameter is the internal diameter of the exhaust flange. 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. With a measured 161bhp at the rear wheel and a dry weight of 119 kilos, you can probably imagine what the performance is going to be like…. 68-inches and N given as 9000, we find that. First we look at how the initial sonic compre part of the two stroke pipe building process by www. Includes equations by Professor Gordon P Blair. These pipes are pretty chocked up and quiet, this mod fixes that and improves sound. The downside of raising the port height is that it narrows the effective power band. I put together a "how to" video showing how to build a clamp system that bolts to your expansion chamber and allows you to pressurize the tank. In this video I will demonstrate how you can easily remove dents from a 2 stroke pipe, if you want to remove dents from 2 stroke expansion chamber I would re the official home page of the 2 stroke wizard tuned pipe & 4t exhaust header wizard software. Sorry bro, gotta agree with the above. Get it as soon as Tue, Oct 1. Thus, using again the Kawasaki F-5 engine as an example, with L being 2. 1. On a four stroke, you can rely 100% on the afr for tuning. Below shows the pipe dimensions given by the 2 Stroke Wizard that you can use if you want it to be just right. If some one wants to start out building pipes themselves, buy some books or buy TSR software. The spring fastening, together with the o-ring (s) or crush gasket is sufficient to contain the very small amount of exhaust pressure in a 2 stroke exhaust, plus it also helps isolate vibration. At the end of combustion, the Using the Plot Cone dimensions from the Two Stroke Freeware Expansion Chamber Calculator I show how to draw a cone plot on to flat papers to be traced on to Jul 10, 2014 · They are on the rubber mounted to the frame to keep the vibration from fatigue cracking the pipe over time, and to help isolate the sound waves. This will quieten up your exhaust noise, although the chamber does look a bit odd. You feed in the dimensions needed for your pipe, diameter, angles and length and the software creates your pattern which can be output in AutoCAD DXF files or encapsulated postscript. PORT TIMING. Using Tuned Length and Port Area from previous vidoes to dimension the 3 stage diffuser 2 stroke expansion chamber. If it is a positive wave and hits a change in May 17, 2018 · Part 4 detail how to measure 2 stroke exhasut port window area to convert to a diameterto be then used to dimension the diameters of the Expansion Chamber Ex About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Apr 24, 2022 · Find a copy of Two Stroke Tuner's Handbook by Gordon Jennings. For Pocket Rockets & Mini Dirt Bikes - This mini bike muffler is crafted to perfectly fit 2-stroke 47cc/49cc engine pocket bikes. kpmotosolutions. C. Step 3. It is a fairly inexpensive way to avoid getting your dirt bike expansion chamber dented beyond repair. com: 2 stroke expansion chamberSo, what is an expansion chamber, and how do they work? The problem with such a simple design as the 2-stroke is that it is relatively hard to improve. USA Expansion chambers are also a perfect match for 2-stroke engines because they are simple, lightweight, and cheap to produce, which fits well with the 2-stroke design philosophy. Longer center section (non-tapered section, typically the second or third section) gives more low end. A four-stroke engine requires four strokes of the piston to complete a power cycle in two crankshaft revolutions. There are 2 tuned lengths in a 2 stroke expansion chamber not only the port to baffle cone taper. My page on pipe making resources: www. Graham Bell. Posted December 25, 2018. This Bill’s 2 stroke pipe was mounted on our GasGas MC250 build which turned out looking great. Mar 20, 2011 · The pipe is so important in a two stroke, it's been said 1/2 of your power is in the pipe. With a tuned exhaust pipe, the pressure wave from the exhaust bounces back from the end of the pipe and reaches the port again just in time to cram some of that charge back into the cylinder, which creates a bit Apr 10, 2020 · In this informative YouTube video, we delve into the world of 2-stroke engines and explore how you can enhance their performance with the help of an expansio Apr 21, 2018 · Here is a list of supplies: old tire tube (Or tire valve) 3” x 12” x 1/2” project wood (oak) Rubber air compressor “foot”. xlsx or . That made sense to me, especially comparing it to a trials bike which has pretty much a straight header and rides like a four stroke as far as power curve goes. When you change that shape and volume it will affect things, but how much depends on the damage. If you ride a dirt bike, you most likely have a 2-stroke, especially if you do Enduro. 68 x 9000. $39. $59. U bolt 5/16” or 1/4”. Started off as a lovely sunny day, It soon got bloody cold! Overall I'd say it Part 5 is second part of calculating 2 stroke exhaust port area accounting for the radius corners of the port. 7%. ”. $5 off every $500 with coupon. But a pipe isn't going to give a four-stroke the massive, off-ON-off kind of hit a two-stroke has, and really, you wouldn't want it to. Chambers on above link will fit on your 1975 RD350B AC, but might require some modification. http://dragonfly75. Expansion Chamber Muffler Pipe Fit 80cc 2 Stroke Motorized Bike Gas Engine. The video covers how to measure up and wha If you’ve ever ridden a two-stroke in the bush, chances are you’ve dented, damaged or completely destroyed the bike’s expansion chamber. 6. See testimonials. In this video we look at the very basic concept of how back pressure works in 2 stroke expansion pipes. (wide-ratio 5-speed trans, weak crank, ect. While flattening out the pipe doesn't change the power much, the flatter you go the more likely it will have a negative affect. Feb 22, 2017 · How to build your own expansion chamber without any special tools. Fit the lower part of the expansion chamber over the header pipe. Apr 26, 2021 · Chambers are build to order and lead time is about 4 weeks from the date of order to ready to ship. Firstly I talk ab Dec 7, 2011 · In a 2 stroke engine a little bit of the fresh fuel-air charge always flies right out the exhaust port before the compression stroke. Thus the need for the first cone getting bigger to the expansion chamber. "Best" pipe will depend on your engine. com/motorbike/resources. Really,a lot of math is involved. 2-stroke exhaust systems work in harmony with the combustion cycle, providing two benefits. Supported units are meter, inch, foot, yard, radians, degrees Bend the outer sides of the sheet metal to have a curve, then pull the side ends together, then clamp them in place, then weld the side ends together. 95. Its MX2 Works pipe is made from 19-gauge carbon steel, features broad-based power gains, is hand-welded for a proper fit, and is made in the USA. For example, a smaller, more gradual expansion chamber yields a smoother power curve. 2 strokes will always make the most horsepower with ONE individual expansion chamber per cylinder. For a 500cc engine I probably wouldn't go thinner than say 2. 4 x 5/16 or 1/4”x at least 5” eye bolts or J bolts. ) Apr 27, 2023 · Finally complete my 2-stroke exhaust for my old abandoned motorcycle MX restoration ProjectCurrently I'm quitting my everyday job to do YouTube full time. Finally, enter the exhaust duration of 184deg and the peak power speed of 12500 revs/min and click the Design Now button. Oddometer: 7,187. Germany was running short of petrol, which was at that stage produced using coal and sewage transformation. Good info on ins-and-outs of expansion chambers. calculate high torque expansion chambers! using twin convergent cones with exactly calculated resonance to make any two stroke engine making power 2000 to 3500 rpm earlier compared to the conventional expansion chamber. Pipes can be manufactured in Mild Steel, Stainless Steel, Inconel and even Titanium to give the customer every possible option of the finest materials Apr 23, 1996 · Adding Divergent Tubes, which used to be called "Megaphones," to Two-Stroke Pipes Helped Make Useful Power. 49. In this example the dimensions are 45mm and 27mm respectively. You can test your own engine and then re-test and compare your modifications – or build your ultimate engine right on the screen. 2. Jan 10, 2017 · Underdogs racing has developed an easy online calculator that will spit out the design for you. May 4, 2010 · Cleaning (de-coke, de-carbon) an exhaust header, expansion chamber and pipe is a periodical must to reap full advantage of the engines capabilities, that is often overlooked. Dec 30, 2020 · Its size and shape is matched specifically for your engine. Currently $175 on Ebay though. Next enter the cylinder bore and stroke which are 40. scrambler73 said: ↑. 6 Expansion Chambers. Be sure to protect your exhaust and add a protective plate if you plan on doing serious off-roading. Restoring a 2 stroke pipe part 1Make a 2 stroke expansion chamber pipe for the rs-100 Melodramatic i wash my clothes merchandiser cleaning 2 stroke exhaustExhaust stroke pipes work. Free shipping. One can choose to design a single-stage, two-stage or three-stage diffuser chamber according to their requirements. MZ65 is the best "bolt-on" pipe. Mar 20, 2014 · I have found that it's best to run the outlet ( stinger ) off the side of the mid section of the chamber, with a flare ( bell mouth ) from the chamber into the stinger pipe. How to measure and calculate odd shaped ports a 2T Exhaust Calc - Ver 1. comGo to the 2T Exhaust Calc menu itemComplete calculations for Professor Gor Fit the engine header pipe leaving the exhaust nuts slightly loose. Expansion chambers help to pull gasses through the engine during the exhaust stroke. Still many choose not to install pipe guards on their dirt bikes. There are three sections to a tuned 2 stroke motorized bicycle Nov 17, 2017 · This is the first video in a series looking at the science and mysteries of 2 stroke expansion chamber exhausts. FREE Shipping by Amazon. NOTE: This is sponsored content produced in partnership with Akrapovič Apr 5, 2020 · In this video we show the work on how to make a two stroke expansion chamber for our Bultaco drag bike project. Brand New. Bikers make great organ donors, get 115 on your licence today. Feb 27, 2024 · Two-stroke pipe building information. 2 stroke wizard dual power add-on. $50. The software equations used are derived from the work of Professor Gordon P Blair who carried out the most comprehensive scientic study of 2 stroke The expansion chamber is the most tunable component on the modern two cycle engine and dramatic gains in power can be achieved with the correct design. Remember to include the "restrictor" at the end of the rear cone. Cap off stock pipe helps power some, but a 2stroke needs a chamber for proper scavenging and control of the AF mixture - a properly sized pipe for your motor will not only help make power, but extend your RPM range. The arrangement of the intake and exhaust ports in a two cycle engine affords a unique opportunity to use the exhaust system to influence the intake sequence. 5:1. You start spraying the stuff in each carb, one after the other and you spray until the engine starts to miss. Your expansion chamber works to basically supercharge your dirt bike. Some of those serve no function at all while others do wit Apr 27, 2016 · I ran quite a few calculations for different tuned results and compared the results. While you may not have realized it, the chamber actually “supercharges” your engine. Shake it again, dump all of the EasyOff & rocks finish with flushing with high pressure water . Two strokes are all about the exhaust. I made expansion chambers for a living back in the early 70's. motorsykkelpodden. Bill’s Pipes has been building expansion chambers for over three decades. It works. He Making progress towards dynoing the PiP engine, trying to convey some kind of a message along the way. It's taken a while but the pipe is done Part 1 of the pipe build is here: https://youtu. Where: C m is mean piston speed, in feet per minute. Outlining how Gordon Blairs ratios given a the official home page of our 2 stroke wizard tuned pipe calculator & 4stroke header wizard calculator software Apr 24, 2022 · Everything with a two stroke is a compromise. Nov 29, 2018 · Easy steps to design your own 2 stroke expansion chamber power pipe exhaust to get more power. I will tune pretty much anything 2 stroke, and when it comes to pipes, for the most part I build expansion chambers for Yamaha bikes – mainly 250 LCs, TZ and TZRs, and TDRs. a very wide powerband and more “usable power” Jan 18, 2021 · This shows how I "roll" a section of a pipe with just a few tools. N is crankshaft speed, in revolutions per minute. Benham custom fabrication: 2 stroke pipe repairStroke pipe two works raw tuesday motocross mxa dream How cleaning your 2 cdhpower2012 (775) 96. Aug 25, 2005 · Jun 13, 2007. I use advanced engine modelling software to formulate my designs, as well as years of tried and tested expertise. tp lc jx et uo ke op aq rh aj