2 stroke motocross engine tuning books

The regulations for 2002 season are used as a guideline. I am very proud of the riders i helped and sponsored and there is an appendix. Anyone interested in doing their own engine porting, or taking the time to learn the intimate secrets of 2 stroke. The two stroke dirt bike engine building handbook paul olesen, kelsey jorissen on. Improper 2stroke carburetor tuning will have a much more significant effect on a 2stroke engine than a 4stroke because the premixed oil lubricates the crankshaft. Those of us who have grown up in the japanese two stroke.

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. Velosolex s 3800 2stroke tuning and engine design books. Other books to his credit are modern engine tuning, twostroke. 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. Motorcycle tuning twostroke 1994 edition open library. A rich mixture will cause poor performance, but a lean mixture can destroy your engine over time. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. Bigger carburetors, higher compression ratios, altered port timings and expansion. Why proper carb tuning is critical for 2 stroke engines. It is important to us that you are happy with all the work that is carried. We have the optimum case modifications to suit each application and engine developed over countless hours. Everything you need to know about the twostroke cylinder. 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.

Mar 10, 2017 knowing how to choose the right type of racing fuel for your bike can be confusing. 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. Improper 2 stroke carburetor tuning will have a much more significant effect on a 2 stroke engine than a 4 stroke because the premixed oil lubricates the crankshaft. Bigger carburetors, higher compression ratios, altered port. The inlet port opens 30 after bdc and closes 79 after tdc. Twostroke motorcycle engine maintenance and repair. It is my hope that this book will assist the enthusiast involved in motocross, enduro, desert, road or gokart racing to develop and tune his twostroke engine for. In other words, the engine will, after tuning, produce more power from the same displacement. Contents chapter 1 introduction 9 chapter 2 the cylinder. Goodreads helps you keep track of books you want to read.

Okay, my interest is with 1970s motocross bikes, so this book is excellent in terms of. With that we have categories that cover most riders. Im waiting for my bike to arrive and realized i dont remember the appropriate mixing ratio. Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance 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. The twostroke engine is widely used for competitions in both motorcycle racing and. Two stroke engines abebooks abebooks shop for books. Contents1 riding a 2 stroke vs 4 stroke dirt bike1.

The two stroke dirt bike engine building handbook is the most comprehensive guide for dirt bike engine building available, whether you are working at home or as a professional in a shop. Its called crankcase independent twostroke cits and was invented by former south african motorsport engineer basil van rooyen, director of cits engineering, st ives. 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. Two stroke cylinder porting tips watch this before you start cutting. The morbidelli 125 twin road racer is a rotary valve engine. Jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. This may help you understand just how your performance mods and tunings may affect the engine. Oct 01, 2018 two stroke cylinder porting tips watch this before you start cutting. 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. Jenning vs graham bell, 2 stroke tunning books motorcycle. Motor cycle tuning twostroke by robinson, john, 1994, newnes edition, in english 2nd ed. The process of building twostrokes to race engine quality is explained indepth in this thoroughly illustrated handbook.

An excellent academic book on the theory behind performance tuning for 2 stroke motorcycles. His port time equations dont even include rpm, you input the dime. Two stroke cylinder porting tips watch this before you. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. Engineering acousticssonic supercharging of 2 stroke engines.

Hey all, could someone give me a quick refresher on mixing oilgas for a 2 stroke. Get it if you want to squeeze peak performance out of your 2 stroke engine. With thick pages and highquality construction, this book is designed to withstand heavy shop use. Other books to his credit are modern engine tuning, twostroke performance. The power listed on this guide is from experience not claims.

There is no such thing as the average vintage 2cycle bike or rider. Start by marking two stroke tuners handbook as want to read. Hey all, could someone give me a quick refresher on mixing oilgas for a 2stroke. In motocross its usually a compromise between best peak hp and good early off the pipe power. The high performance 2stroke 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. 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. Work to include port cylinder head, deck height of cylinder checked and altered if needed dependent on which engine you have, high compression piston, cam reprofiled or aftermarket one used, valve spring kit if needed, ecu mapping or carb boring, we use only the very best parts in our engine preparation.

We are 2 stroke dirt bike specialists and offer a variety of services to meet your needs, situated just off the a50 in stoke on trent, which means we are easily accessible from the motorway. The illustration below covers the four stages of a four stroke engine. The company owner is a rider of over 30 years, and still a performance coach to this day. Now to my pleasure there is an awful lot of 2 stroke talk again.

Following any tuning product purchased, we offer trackside assistance to ensure that the bike is set up correctly. The two stroke dirt bike engine building handbook diy. Villiers engine practical guide 2 stroke engines pearson book inc autocycles. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. Hopup tips the following hop up tips are for reference only. Nov 11, 2010 jenning vs graham bell, 2 stroke tunning books. A textbook dealing with the principles of design and construction, with a special chapter on the two stroke engine paperback or softback by kean, francis john and a great selection of related books, art and collectibles available now at. Still its nice to see 2strokes still being improved. If this does not describe you please stop and seek professional help as engine damage and serious injury can result from. 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. For sheer power for money and driveability the best setup would comprise of. I started reading these about a year ago now and ive learned so much in just the short time already its mind boggling.

Now ktm has filed a patent for a fuelinjected twostroke engine that they plan to introduce to their enduro range from may. It has a very large port area, but then it has to have a large area as it flows only about 85% as well as an unbridged port of equivalent area. Welcome to sct racing engines established since 1990. The objective of tuning is to improve the volumetric efficiency of the engine. It covers my early days in the motorcycle trade, on to starting my own mc business then forming my tuning business. You probably know that octane is not the makeit or breakit number when it comes to choosing race gasand. I usually recommend this book along with gordon jennings two stroke tuners handbook, because this book has what the first one doesnt and vice versa. Before buying any parts or doing any modification you need to determine exactly what you want. Lets journey back to 1973 and read the book that was the two stroke bible of that era. 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. Basic 2 stroke tuning by eric gorr changing the power band of your dirt bike engine is simple when you know the basics. Motorcycle tuning twostroke by john robinson goodreads. Unless you have a deep passion for twostroke tuning, are willing to.

I usually recommend this book along with gordon jennings two stroke tuners handbook, because this. Motor cycle tuning two stroke by robinson, john, 1994, newnes edition, in english 2nd ed. You input the dimensions of the engine and it spits out how long the port should be open. He says advantages over fourstroke are that the cits. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. Piston and bottom end lubrication may still require an oil mist which is not at all catcoverter friendly. Stc racing engines our services motocross engine tuning. Porting and trenching twostroke engine cases duration.

Aussie twostroke engine invention motorbike writer. A sydney engineering company has developed a new twostroke engine that they believe could be used in motorcycles. This is in contrast to a fourstroke engine, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. Bells fourstroke performance tuning book, this book goes into extreme detail regarding performance tuning a twostroke engine. Very few other books on engine development and most of these are either. The trend in high performance two strokes has continued towards more case volume, however each engine and application differ. Twostroke engines making comeback motorbike writer. The ports found within a twostroke cylinder in combination with the exhaust. Ill try and get the ball rolling in here with a list of books i currently own on 2 stroke engines, and 2 stroke engine performance tuning. He really talking abour a mixwre of fuel and oil if yoll rjchen rhe premix ratio 20. 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. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field.

If only some older roadgoing 2strokes had the benefit of improved engine. Knowing the category of rider you are helps to choose the right modifications to best suit your riding and budget needs. 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. Just recent got my kx100 and ive always loved 2 strokes and definitely wana learn more about building and tuning them any good books i can buy out there. Two stroke performance tuning the square bridged port is fairly common in large displacement motocross and enduro engines figure 3. A textbook dealing with the principles of design and construction, with a special chapter on the twostroke engine paperback or softback by kean, francis john and a great selection of related books, art.

Welcome to tech tune racing ltd with over 35 years of racing and working in the bike industry, we know bikes inside out and take pride in providing the highest quality work. Facebook is showing information to help you better understand the purpose of a page. In the model tuning tips chapters of this book, all the head specs quoted have msv ratings designed. Buy twostroke motorcycle engine maintenance and repair 1st edition by dave boothroyd isbn. Two stroke tuning advice from the experts at bimotion. The piston crown opens and closes the exhaust and transfer ports. Bells four stroke performance tuning book, this book goes into extreme detail regarding performance tuning a two stroke engine. The ktm sounds like it is a conventional 2stroke we know and love but with fuel injection tacked on. Two stroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. It is not intended as a tuning reference so the settings and timings are for example only, but. The two stroke dirt bike engine building handbook diy moto fix. I bought this book together with twostroke performance tuning by a. Reviewed in the united states on november 20, 2014.

The two stroke dirt bike engine building handbook 2017 by paul olesen author. Knowing how to choose the right type of racing fuel for your bike can be confusing. Graham bell starts off by saying that he doesnt believe port time area and its all about the duration the ports are open. Sct racing engines provide a complete engine overall service on all two four stroke motocross atvs and enduro bikes. See actions taken by the people who manage and post content. Those of us who have grown up in the japanese twostroke. Oct 17, 2017 two stroke cylinder porting tips watch this before you start cutting. Would recommend to people interested in the inner workings of a two stroke engine. Why proper carb tuning is critical for 2stroke engines. Tech tune racing motorcross race winning performance 2.