In motocross its usually a compromise between best peak hp and good early off the pipe power. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2stage or 3stage diffuser. The official home page of our 2 stroke wizard tuned pipe. Inertia flywheel, there is several good guides on the net, one norwigian has a very good working one and really good instructions to. The carb is a 39 mm keihin pwk and the pipe fmf h49.
The modern race bike requires precise tuning, knowledge, and expertise to unlock all possible power, ride characteristics, and delivery of power. The most common mistake is to choose the wrong combination of. Basic 2stroke engine tuning information joe hunt rc. Softengine dynamometers and engine simulation software. Claims by many about being the best way to tune an engine must be qualified. 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. Each part of the 2stroke cycle can be evaluated and designed. Typical of a 2 stroke its got less rpm to work with, but i will offset that with longer gearing to keep it in the high numbers longer. Often youve been forced to use the reed petals proposals on the. You may switch between testing blown bigblock engines one day, and then a tiny two stroke the next, all without ever having to modify a single gauge name, graph range, or test parameter. Roll your pointer to the left of the table to see typical values. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. An excellent academic book on the theory behind performance tuning for 2stroke motorcycles.
I have switched to a different computer which is somewhat slower than the original hp i started with. Gsf dyno the dynamometer software for wellfounded tuning. Thank you for your interest in dynomationtwostroke designed for windows98xp. Bigger carburetors, higher compression ratios, altered port timings and expansion.
The following are spreadsheets for different aspects of 2 stroke designmodification. Two stroke performance services offered full power. The two stroke engine is by far the simpler of the two types of engines. This is the most accurate, capable, and complete engine simulation software package ever offered to the professional engine builder or avid enthusiast. Selfadhesive ktype probe, ideal for crank case temperature vital for consistent 2 stroke dyno testing, radiator, intercooler or hose temperatures etc. Two stroke engine and exhaust design software north. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. We also have a simple 2stroke expansion chamber design program. Ill also add that ive seen my dyno graph overlayed with several 450fs powerbands and it holds its own. Taylors engine dynamometers deliver the best overall value by driving productivity, ensuring uptime and bringing you rapid return on investment. Egts are a good reference for where the engine made maximum torque and hp at all rpms at wfo. New feature of racingsm software, the 2stroke exhaust segment splitter. Suitable for both 2stroke and 4stroke engines up to 40 kw 55 hp.
Lunde, norway karting inertia dyno using black box ii and af on 2 stroke engines. Estimate horsepower output from any engine type 4stroke, 2stroke, any fuel type, turbo, blower, wankel, etc. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. This calculator will help you estimate the potential of an engine. We even offer mobile test centers and engine dynamometer accessories. The best way to tune a 2stroke engine is on an engine dyno. Computer input requirements are indicated for the following software programs. In the 2stroke 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. We believe that using this software will help your 2stroke development or racing results on different types of competition. Cold rolled sheet metal i used 18 gaugelots of welding rod i used a 110v wire feed welderrubber stoppers for isolation. In addition to our advanced simulation technology, here are some additional features in dynomation5 that were designed and developed by motion software, inc. We offer trackside testing for both engine tuning and efi.
Hey guys, first i want to thank damorc for the amazing software. This is in contrast to a fourstroke engine, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. Suitable for both 2stroke engine and 4stroke engine until 40 kw 55 hp. I would like to make up a small engine dynamometer for testing my changes to this engine however i would like to test and change only 1 cylinder instead of changing and testing all 4 cylinders at the. Hewitt inertia dyno go kart dyno, small engine dyno and more.
Twostroke waveaction engine simulation motion software. My homebuilt dyno made from scrap steel and an old electric motor. Trx250r on the dyno 2 stroke engines glamis sand dunes. Iame rotax vortex ok1 rk1 tm subaru kz and many other similar engines.
My days of riding my best are past me and i really want a long smooth powerband first and foremost. Highly experienced, reputable, and race proven cylinder and crankcase porting, cylinder head cutting and reshaping. Dynostar etb400 triple inertia engine testbed for kart, mx and enduro engines. Additionally, user formulas allow you to expand calculated data sources beyond the over 300 builtin ones. The dynamometer for accurate power and torque measurements, breakin programs and track simulations. With dyno pros advanced windows software, dyna run v3, operating the dynamometer is simple and user friendly. I am looking for any equations or rules of thumb for calculating theoretical 2stroke engine horsepower. 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 2stroke for maximum performance. Yes, on a 2stroke the metering is mostly throttleposition specific, not rpm specific. Complete explanation and equations to make tuned expansion chambers for motocross or roadrace tuned powerbands. These are the files that can function manually without using macros by using open office.
The trend in high performance two strokes has continued towards more case volume, however each engine and application differ. We offer a variety of engine dynos including hydraulic water brake, eddy current, ac, portable and small engine dynos. From a 2stroke motor in a lawn mower, to a v8 stock car engine, horsepower and torque are the bench marks of engine performance. Our datamite family of data loggers and dyno datamite software have. Hp is a full on specialist in ecu tuning 2 and 4 stroke, cdi development for 2 strokes, and general mapping needs.
Dyno curve below shows an excellent peak power of 17. 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. I dont have access to a 2stroke engine simulation program. The chapters on intake, transfer, ignition, an exhaust systems explain all of the best ways to improve the engine from stock with simple formulas so they work with all sizes of engine. With virtual dyno, save pictures of your dyno graphs to post on forums, email to your friends or compare with others. Motorcycle dynamometer philip harrison ba trinity college dublin. The sfpowermark engine dyno features a rugged and durable power absorption unit with a 2 diameter main shaft machined from solid stock 174ph stainless steel sf902s the sf902s engine dyno houses a new absorber designed for high rpm and maximum durability. If that dyno run was done wot the whole range, than the af ratio reading is primarily from the main jet. Dynomationtwostroke engine simulation motion software, inc. Very unique and complete engine dyno for kart engines and easy in use. Harris performance engineering hp race development. Split your calculated 2stroke exhaust up to 42 sections with regular length or even more with irregular lengths. After 40 years of doing this i can honestly say this is true.
Compared to the actual dyno pull of the engine, the horsepower and torque peaks are deadon the same rpm, while the horsepower is up 3. One of this releases most impressive features is its powerful formula editor. The dynomite computer records the resultant absorberhousings torque and calculates power via the standard formula. 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. Two stroke performance services offered performance for whatever your speed needs are from trail, to drag racing, snow cross, water cross, oval, speed runs, hill climb, mx, or tt. Engine manufacturers and aftermarket suppliers use an engine dynamometer dyno for short to accurately measure an engines performance. Dynoteg kart engine dyno ked1 or ked2 for kart engine tuning. Here are a couple of dynamometer test results using the dynojet dyno 150. From a 49cc racing engine, to a gp 125 engine, or a 1500 mercurial triple engine, or a 250 kart engine, racingsm software suits all. I am in the planning of making an engine dyno, it has to fit two strokes up to 20hp.
The new computer has a pentium 200 mhz processor instead of the faster 400 mhz celeron. Software for fine tuning and design of two stroke engine. We have the optimum case modifications to suit each application and engine developed over countless hours. Two stroke engine and exhaust design software post by oldjohnno. A twostroke or twocycle engine is a type of internal combustion engine which completes a power cycle with two strokes up and down movements of the piston during only one crankshaft revolution. It is running 192 degrees of exhaust duration and 2 degrees of transfer. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed.
Each part of the 2 stroke cycle can be evaluated and designed. Apples to apples the 2 stroke has more bottom end performance. All software is free for life and you will never be charged for standard software upgrades, if you purchased your dynamometer from dyna pro or one of its authorised distributers. The software in question the inexpensive stuff is great for someone who just does not have the math skills to wade through what seem to be a text book of complex formulas.