This is an excellent book on performance tuning 2strokes get it if you want to squeeze the most performance out of your bike or other 2stroke engine. Small values of kh are best suited to grand prix engines with narrow power bands, larger. Port matching, porting and trenching twostroke engine cases. 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. Blair of queens university belfast, and published by the society of automotive engineers. Typically when a new engine is designed the port characteristics are one of. Everything you need to know about the twostroke cylinder.
With the traditional lubrication technique of mixing oil into the fuel, they also have the advantage of working in any orientation, as there is no oil reservoir dependent on gravity. The engine porting determines whether high rpm or mid range rpm is where the. Racingsm software for 2stroke development, also for 4strokes in some modules, create 2t exhaust. The way a two stroke motor works causes them to be fairly noisy and a bit inefficient.
The newest info i have is the two stroke tuners handbook by gordon jennings. Pdf improving the performance of twostroke motorcycle with. It seems to be trying to fix a non problem of two strokes, their pumping losses, two strokes dont have significant pumping losses. Two stroke modificatons and services four stroke modifications and services. Twostroke oil is expensive, and you need about 4 ounces of it per gallon of gas. Free advertising view adverts we offer you, lover of 2strokemotorcycles, a central marketplace where you can offer or find your motorcycle and parts. This engine modelling software allows for the complete prediction of engine performance from torque to fuel consumption to exhaust emissions. Motor cycle tuning twostroke by robinson, john, 1994, newnes edition, in english 2nd ed. The basicexhaust tuning mechanisms was described w ith respect to a twostroke singlecylinder engine. Twostroke engines do not use fuel efficiently, so you would get fewer miles per gallon. The information used in the programs calculations was taken from the books the basic design of the two stroke engine and the book design and simulation of two stroke engines. Nov 05, 2011 a simple 3 stage two stroke exhaust calculator based on formulas of g.
I am very proud of the riders i helped and sponsored and there is an appendix. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. You can also save and load the data by using the provided functions. There is quite a large section on changing the face of production racing and into the marlboro series and the lc era and through the kr1s and rgv eras. You would burn about a gallon of oil every 1,000 miles if you used a twostroke engine in a car. 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. Software for fine tuning and design of two stroke engine by.
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 have the book, but its nice to have as a pdf as well and a good reference for those who dont know about it. 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. Performance engineering 2 stroke tuning we specialise in honda 2strokes, covering the cr range of motorcross bikes, the nsr250 street bikes, and hrc grand prix 125, 250, and 500s. Two stroke performance tuning back in europe two stroke engineers were battling excessive ring and cylinder wear, due to the exhaust port width being too great. Bigger carburetors, higher compression ratios, altered port timings and expansion. Great book, but ill guess the world has moved past that info. Torqsoft twostroke exhaust system designer programme. Two stroke motors are more efficient that four strokes for a few reasons. 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.
Tom turner, master two stroke tuner, pipe builder, and the man that. Below are notes on my free spreadsheet of free 2 stroke calculators. Each part of the 2 stroke cycle can be evaluated and designed. The worlds leading 2stroke engine simulation software available readytorun on your pc, at only. Mar 16, 2012 sad to say, but the two stroke was a thing of beauty when it came to hopups. Some early tz700750s used a pair of 2into1 chambers, but they were more an answer to the flatsided oem pipes than an actual tuning aid. Tech tune racing motorcross race winning performance 2. 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. Oct 24, 2017 10 ways to gain power in a 2 stroke engine for free. The old adage of stuffing cases on every project just isnt true any more. Tom turner, master two stroke tuner, pipe builder, and the man that developed tsr two stroke racing software designed and built his 424cc yamaha rd400 dragbike to develop and prove his racing design software and prove it, it did. Two stroke performance engine tuning performance parts. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field.
Computer input requirements are indicated for the following software programs. Aussie twostroke engine invention motorbike writer. At durham motorbikes we have decades of 2 stroke tuning experiencewhich now days is fast becoming a black art. Two cylinders into a common pipe should work, as long as theyre both in synch as the tzs were. Racingsm software has features for many different areas 2stroke 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. We use computer design software to maximize power and torque at any elevation.
The software does complete cycle simulation of the whole internal combustion process including the. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer. Motorcycle tuning twostroke 1994 edition open library. Unless you have a deep passion for two stroke tuning, are willing to spend money on software and porting equipment, and are comfortable throwing away botched cylinders, i would recommend having a reputable professional carry out any desired port modifications. Patrizio marchetti director at dragon motorbikes was brought up with two strokes and the mear mention of two stroke tuning will bring a smile to his face. The way a two stroke motor works causes them to be f. It covers my early days in the motorcycle trade, on to starting my own mc business then forming my tuning business. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. The complete engine geometry together with these two exhaust systems is simulated using an engine simulation software package virtual. A narrow port reduced power but improved reliability.
Two stroke engine and exhaust design software north. Motorcycle, chainsaw, personal watercraft, model aero and most similar engines. A tuned pipe has a set of cones divergent meaning the cone gets. I found most other software work on outdated blair and jennings formulas. Compared to our 4 stroke efi kits, this kit can drive 2 injectors per cylinder one big injector, one small injector. The trend in high performance two strokes has continued towards more case volume, however each engine and application differ. This coefficient kh is called the horn coefficient, with typical values between one and two. 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. 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. Doing the finishing touches on the spx cylinder and wanted to give you a quick tour of my porting setup. On one hand, jetting changes can give you an inexpensive means to instantly increase horsepower, throttle response and power characteristics. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. There are many ways to boost the power, one of which is by installing a tuned pipe.
All brands aprilia bmw cagiva ducati gilera harleydavidson honda husqvarna kawasaki kreidler ktm other puch suzuki yamaha zundapp. Those of us who have grown up in the japanese twostroke. 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. Dec 09, 2017 doing the finishing touches on the spx cylinder and wanted to give you a quick tour of my porting setup. Velosolex s 3800 2stroke tuning and engine design books. They are so simple and fun that ive always enjoyed tinkering with them. In motocross its usually a compromise between best peak hp and good early off the pipe power. Motas twostroke dyno will give you and your pc the equivalent of many experts knowledge.
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