Tech tune racing motorcross race winning performance 2. The good news is that replacing cylinders and pistons on most 2 strokes is fairly simple, if costly gaskets, etc too. Changing the power band of your dirt bike engine is simple when you know the basics. A bible for building a high speed and high power 2 stroke. The way a two stroke motor works causes them to be f. The calibration software allows you to tune in a 2 stroke parameters for the rpm trigger guess its just a tease. If you have a dirty old paper copy of this manual or a pdf copy of this manual on your computer and it crashed we can help.
Sometimes what you are in effect wanting, which in your case seems clearer to me now, was a. Reviewed in the united states on november 20, 2014. Feb 16, 2017 two stroke cylinder porting tips watch this before you start cutting. The durability of the design has been proven in scca road racing where the v4 engine has raced problem free for several seasons in our dsport race car. Tuning a yamaha rx carburattor plus some troubleshooting steps by yamakaze.
Get your kindle here, or download a free kindle reading app. Balancing the crank dynamically, getting correct piston to bore clearance, using good rings with correct end gap, matching piston weights. Those of us who have grown up in the japanese two stroke. Software for optimal setting and design of engines and.
Thank you for your interest in dynomationtwostroke designed for windows98xp. Most of my friends and i rode 2 stroke street bikes and welcomed the. A bible for building a high speed and high power 2 stroke machines. Detailing for any one interested in increasing the performance of their machines. 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 website does not intend to compeed with any other website dealing with 2 stroke tuning, and the information shared is not at all as thorough as what you can get from reading the books. Although there is really no shortage of books on the subject of 2 stroke tuning and preparation, i knew that an active software. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. Lectron install 2 stroke tuning, adjusting metering rod, and idle. Performance engineering 2 stroke tuning we specialise in honda 2 strokes, covering the cr range of motorcross bikes, the nsr250 street bikes, and hrc grand prix 125, 250, and 500s. Repost next we calculate the bmep brake mean effective pressure being the average cylinder pressure. The piston crown opens and closes the exhaust and transfer ports. The inlet port opens 30 after bdc and closes 79 after tdc.
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. Two stroke carburetors are perfect practice for novice mechanics. This is the unique supercharging effect of two stroke engines. Support racingsm by subscribing our youtube channel. Lectron install 2 stroke tuning, adjusting metering rod. Often youve been forced to use the reed petals proposals on the market, without being able to take significant action. An excellent academic book on the theory behind performance tuning for 2 stroke motorcycles. Small values of kh are best suited to grand prix engines with narrow power bands, larger. Just a quick update on the progress of the freeware 2 stroke expansion chamber calculator software. New version of 2 stroke expansion chamber software.
From the bellmouth of the carburetor, to the insert of the reed valve and the reed petals, at the studied of the cylinder ports, until to the balance of the crankshaft, thanks at our software you could optimize your engine and to develop new. Detune 2stroke for more torque yes sub, it will move the power around. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. Jun 25, 20 one of the most famous books on 2 stroke tuning. Most of my friends and i rode 2 stroke street bikes and welcomed the knowledge that. Mxa mixes vp110 with pump gas for use in slightly modified two stroke engines in. For sheer power for money and driveability the best setup would comprise of.
For manufacter and tuner of two stroke engine, ntproject has developed a series of software to help in the development of the engine and its components. Racingsm software 2stroke exhaust calculator lufo youtube. Jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer.
His port time equations dont even include rpm, you input the dime. Graham bell starts off by saying that he doesnt believe port time area and its all about the duration the ports are open. 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. Two stroke engine porting, head mods and pipes two stroke tuning advice from the experts at bimotion. This coefficient kh is called the horn coefficient, with typical values between one and two. The most powerful two stroke assembly part 2 primary intake. First rule of 2 stroke or any tuning is to make it like it should be, i. Enough to get you started and hopefully lead on to growing your own knowledge and skills.
Two stroke design instead you can enter the data of your cylinder with extreme facility and precision, and then analyze the port areas and the timing area in the engine cycle timing for each phase. You can also save and load the data by using the provided functions. How to install a lectron carburetor on a 2 stroke dirt. Bws125 tuning engine 205cc big bore kit with piston 65mm, and cylinder head ex21in23 valves.
Nov 05, 2009 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. In the 2 stroke engine with reed valve admission, the identification of petals more adapted to the reed valve and to the engine is essential to maximize the performance starting from the intake phase. Two stroke high performance engine design and tuning. It is important to us that you are happy with all the work that is carried out so you come back to us and share positive feedback with others about the service you received. We also offer the customer a complete bespoke tuning service so they to can feel that spine tingling rush only a two stroke can provide.
The only time that it will be clean is under constant high load situations such as an expert level rider on a sand track where the exhaust system can retain enough heat to burn off the oil residue. On a stroker things like matching the ports to the liner, crankcase to transfers etc. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a two stroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. The bmep value will provide an indication of the average exhaust gas temperature we need to. Vp110 is a good, allaround fuel for hoppedup two stroke engines. Outboard manuals suzuki service repair manuals free. Yamaha videos two stroke performance engine tuning. If the timing is close to tdc topdeadcenter it is possible to catch the piston just at the wrong time with the result that the engine runs backward. Two stroke performance tuning a disc partially cut away and attached to the end of the crankshaft opens and closes an inlet port in the side of the crankcase.
There are many ways to boost the power, one of which is by installing a tuned pipe. I have the book, but its nice to have as a pdf as well and a good reference for those who dont know about it. Geared specifically for gp and kart racers, this hardcover treasure has turned out to be a great reference source for questions on the logic and concepts that pertain to tuning a 2 stroke for maximum performance. Nov 05, 2011 a simple 3 stage two stroke exhaust calculator based on formulas of g. Bigger carburetors, higher compression ratios, altered port timings and expansion. How to tune your carb carburetor tuning tips and tricks. Two stroke cylinder porting tips watch this before you start cutting. Custom designed cylinder and head by two stroke performance fitted to a 2011 husaberg te250 to give 330cc. Two stroke performance uploaded a video 5 years ago 0. The description of 2 stroke toolkit this toolkit offers some basic two stroke engine calculators in hand but also extends to some advanced as well tuning menu. The power listed on this guide is from experience not claims. The unique v4 engine design combines light weight with the strength to take the punishment of the most demanding conditions. The high performance 2 stroke engine is a pulse resonance engine which means that the operation in general and the scavenging in particular is not only dependent upon the pulses created from piston pumping but also from combustion properties.
Although there is really no shortage of books on the subject of 2stroke tuning and preparation, i knew that an active software programme would be able to offer so much more. Mercury 2 stroke outboard boat motor service manuals are available for immediate download. Once you understand the basic functionality of one 2 stroke carburetor, you can apply that understanding to any carburetor. Mercury 2stroke outboard boat motor service manuals pdf. Free 2 stroke expansion chamber calculator software. Suzuki outboard service repair manual pdf free 4 stroke 2 stroke, df4 df5 df9. Dynomatontwostroke is a dosbased simulation that was originally released in the mid1990s. A 125cc four stroke engine combusts about 110cc of fa gasses but a 125cc two stroke engine combusts about 180cc of fa gasses. On 2 strokes use a quallity synthetic 2 stroke racing oil and jet the carb with the same oil that you will be using. Two stroke high performance engine design and tuning bossaglia, cesare on.
Software for fine tuning and design of two stroke engine. Freeware 2 stroke expansion chamber exhaust calculator program. Its a fine line to get everything just right, which is why racing and tuning 2 strokes is half science, and half black artvoodoo. Dec 17, 2019 download 2 stroke wizard tuned pipe free. A downloadable suzuki boat motor repair manual, also termed suzuki outboard online factory service manual fsm or suzuki engine workshop manual, is a digitally transmitted handbook giving instructions on how to overhaul, service or restore the motor back to working order the digital instruction book contains a wealth of howto guides. The secrets of resonance tuning in 2 stroke expansion. Turbo and even supercharger setups of various configurations can be very useful, however, they are often more complicated with 2 stroke tuning than with 4 stroke applications on a tangent, i did witness a 50cc turbo 2 stroke bike that would do over 150mph, but i digress. Improper tuning of your carb will definitely lead to lagging.
Not content with being one of the premier parts suppliers in the uk from world renowned companies, such as brembo, dymag, samco to name but a few. The basic principle of the tuned pipe is making use of the moving air masses in the exhaust to assist in the scavenging the process whereby the exhaust gases are removed and replaced with unburnt mixture of a 2 stroke engine. Although there is really no shortage of books on the subject of 2 stroke tuning and preparation, i knew that an active software programme would be able to offer so much more. Download mercury outboard repair manual, mercury outboard repair manuals online, mercury 115 hp outboard 2 stroke manual, mercury 40 hp 4 stroke outboard service manual pdf instantly. The only thing you need to do for breakin is not overheat or overrev the motor, wide open is ok for short periods, just normal riding. Contents chapter 1 introduction 9 chapter 2 the cylinder. I have a 02 sensor for my mustang wideband and also have thought many times of how easy it would be to tune. Thunder shark pro racing 66cc80cc bicycle engine kit 5.
Twostroke high performance engine design and tuning. Varying 2stroke stinger diameter motorcycle engineering. You can calculate easily and fast the oil quantity by dragging two bars without entering numbers with keyboard. Software for fine tuning and design of two stroke engine by. A well jetted 2 stroke using a high quality synthetic oil will have evidence of oil at the rear of the exhaust system.
Two stroke carbs are usually found on leaf blowers, motorized bikes and mopeds. The worlds leading 2stroke engine simulation software for 3. Download a suzuki outboard repair manual instantly. This section describes the basic function and the most important processes in the 2 stroke cycle a tuner need to consider in general and with the bimotion tuning software in particular. Two stroke motors are more efficient that four strokes for a few reasons. The main advantage of two stroke engines is that they can combust more volume of fuelair mixture than the swept volume of the engine. They are so simple and fun that ive always enjoyed tinkering with them. This 2 stroke carb tuning guide will give you all the information you need to tune your 2 stroke carburetor for peak performance, no matter the make or model. On a new motor break the motor in for at least an hour. They are easy to work with and do not require excessive motor knowledge to achieve desired engine performance.
Apr 04, 2015 an introduction to tuning 2 stroke motorcycles for those who want results straight out of the box. The morbidelli 125 twin road racer is a rotary valve engine. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. How to design a two stroke expansion chamber performance.550 46 1615 444 1302 628 1239 967 1464 248 480 1127 1248 191 821 1559 500 303 1002 1376 1637 1645 792 2 1444 1027 1131 1287 958 829 1393 338 113 1578 1238 1546 342 1293 1291 387 582 1456 1394 690