Four stroke performance tuning 3rd ed a graham bell. Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance tuning. 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. Bells four stroke performance tuning book, this book goes into extreme detail regarding performance tuning a two stroke engine.
Performance tuning in theory and practice a foulis book. Other books to his credit are modern engine tuning, two. Saab tuning guide maptunusa tech tuner eurotuner magazine. Two stroke to turbo is a saab parts and service specialist with over 30 years in the industry. Twostroke performance tuning in theory and practice bell, a. Bigger carburetors, higher compression ratios, altered port timings and expansion. The piston crown opens and closes the exhaust and transfer ports.
Design and simulation of twostroke engines internal combustion. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. His port time equations dont even include rpm, you input the dime. Twostroke performance tuning in theory and practice.
Vintage saab two stroke race car with crazy swede driving. The morbidelli 125 twin road racer is a rotary valve engine. Graham bell starts off by saying that he doesnt believe port time area and its all about the duration the ports are open. Lets journey back to 1973 and read the book that was the two stroke bible of that era. 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. 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. Graham bell steers you through the various modifications that can be made to coax maximum useable power output. Several years ago i wrote a book, the basic design of twostroke engines. Basic starting settings for 2 stroke dirt bike carbs running standard fuels. The inlet port opens 30 after bdc and closes 79 after tdc. Jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. 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. Tuning this has nothing to do with your idle or low to midrange throttle response.
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