The ford pinto engine was the unofficial but generic nickname for a fourcylinder internal combustion engine built by ford europe. Be the first to ask a question about fourstroke performance tuning. One was george sychrovskys excellent piece two stroke engine mystery solved, dealing largely with how to correctly operate one of the beasts. For those that are twostroke focused, we have a precision measuring guide tailored to the 2t engine. Software for optimal setting and design of engines and.
Well the tt91fs wouldnt be my first or second choice for 3d flying its very heavy compared to almost every other. Thought id better kick the new section off by writing an article for it myself, on the subject of 4 stroke engine tuning, no specific to minis, but all totally relevant. A stroke refers to the full travel of the piston along the cylinder, in either direction. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. The process of building 4stroke engines to a professional standard, from selecting. First rule of 2 stroke or any tuning is to make it like it should be, i.
An excellent academic book on the theory behind performance tuning for 2stroke motorcycles. Ive spent a lot of time looking for a performance related book that reflected both real world ideas and understanding with a hint of engineering in the explanations and the fourstroke performance tuning has met and exceeded what i thought was available. A fourstroke engine has four main strokes to its cycle the first stroke, called the intake stroke, the crankshaft pulls down the piston by rotating. Engine in which piston completes the cycle in 4 complete rotation of the crankshaft. The intake valve is open at this point in the cycle, and air will be pulled through the intake manifold into the motor. Everyday low prices and free delivery on eligible orders. 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. 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. On a stroker things like matching the ports to the liner, crankcase to transfers etc. 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. A fourstroke engine also known as fourcycle is an internal combustion engine in which the piston completes four separate strokes which comprise.
A fourstroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes intake, compression, power, and exhaust to complete one operating cycle. Drawing on the authors many years of experience in tuning and modifying highperformance road, rally and race units, every aspect of an engines operation is explained and analyzed. The descending piston draws a mixture of fuel and air through the open intake valve. The is an introduction to tuning with a programmable electronic fuel injection ecu. It explains in nontechnical language how modern engines can be modified for road and club competition use, with the emphasis.
Improving the performance of twostroke motorcycle with. Balancing the crank dynamically, getting correct piston to bore clearance, using good rings with correct end gap, matching piston weights. First published in 1989 as tuning new generation engines, this bestselling book has been fully updated to include the latest developments in fourstroke engine technology in the era of pollution controls, unleaded and lowlead petrol, and electronic management systems. Recently i opined with a recommendation of two extremely well written articles on dealing with two strokes. What really came in handy for me was the exhaust design calculations and how to choose right size diameter and length itbs for my engine. Software for fine tuning and design of four stroke engine. In an attempt to acquire that understanding i began a study of the highspeed, highoutput twostroke engine that has led to the.
Two stroke high performance engine design and tuning by. A 4stroke engine compresses the fuel air mixture before the gas explosion in the first two strokes and then there are two strokes that push the burnt gases out the exhaust. To allow the air to enter into the cylinder or the exhaust, gases to escape from the cylinder, valves are provided, known as inlet and exhaust valves respectively. Because of this, this engine needs lubricating oil mixed into the fuel. Engine tuning the rc gas engine for radio controlled planes will ensure proper acceleration and keep top speed without harm the engine. The morbidelli 125 twin road racer is a rotary valve engine. Why remapping a naturallyaspirated car is totally worth. Detailed modifications and improvements are described. I just finished reading the complete book and was amazed at the level of detail and. Performance engineering 2stroke 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 high performance engine design and tuning by cesare bossaglia. Vp110 is a good, allaround fuel for hoppedup twostroke engines.
The valves are mounted either on the cylinder head or on the cylinder block. Once knowing the working principles, this work will become much easier. New material on electronic fuel injection and computerized engine management systems. The guide covers everything you need to know about the correct use and implementation of precision measurement tools when rebuilding your two stroke. Great book to read if you are planning an engine tune. Graham bell second edition this is the moped performance tuning bible as far as im concerned. In ford sales literature, it was referred to as the eao or ohc engine and because it was designed to the metric system, it was sometimes called the metric engine. Compression stroke piston moving up intake valve closed exhaust valve closed four stroke cycle 20091005 mmpmm 3 4. On the other hand, while the twostroke engine does not commonly require large dollar inputs to raise its power output, it does require an indepth under standing on the part of the man doing the modifications. Four stroke cycle intake stroke piston moving down intake valve open exhaust valve closed 20091005 mmpmm 2 3. Four stroke engine tuning and fuel question rc groups. Every aspect of tuning a petrol engine gets covered.
A reference book for the enthusiast engine tuner and race engine builder. This stroke of the piston begins at top dead center t. Those of us who have grown up in the japanese twostroke. This book really does cover all aspects of tuningmodifying a 4cylinder naturally aspirated engine and is therefore applicable to the majority of na cars in the uk. Nick swager secrets of speed todays techniques for 4stroke. 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. Tech tune racing motorcross race winning performance 2. This book covers the process of building 4stroke engines to a professional standard, from selecting materials and planning work, right through to methods of final assembly and. First published more than 30 years ago and in continuous print ever since, this remains one of the most comprehensive references available to the enthusiast engine tuner and race engine builder.
Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. There are some very good two stroke tuning guides from lodgemark press they have done most of the guides that kart racers use. Principles and working of fourstroke gasoline engine. Bells fourstroke performance tuning book, this book goes into extreme detail regarding performance tuning a twostroke engine. The piston make two complete passes in the cylinder to complete one o. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. Other books to his credit are modern engine tuning, twostroke performance tuning.
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. 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. With the experience or the simulation you can determine the new timings and the new maximum lift, but what remains problematic is the determination of the lift law and of the cam profile, this to maximize the volumetric efficiency and in the meantime check out the valve. The most common engine cycle involves four strokes. Read this document before reading the applicable tuning section for those controllers, which are here. It covers my early days in the motorcycle trade, on to starting my own mc business then forming my tuning business. 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. One of the main actions of preparation and development of a 4stroke engine consists in the modification of the camshaft.
After this is complete the camshaft rotates to the low spot on the lobe. Mxa mixes vp110 with pump gas for use in slightly modified twostroke engines in. A fourstroke also fourcycle engine is an internal combustion ic engine in which the piston completes four separate strokes while turning the crankshaft. Undoubtedly, the virtue which has most contributed to the widespread use and varied application of the twostroke engine is its mechanical simplicity. Other books to his credit are modern engine tuning, twostroke. Drawing on the authors many years of practical experience in tuning and modifying highperformance road, rally and race units, every aspect of an engines operation is explained and analysed. This free downloadable guide comes right out of the two stroke dirt bike engine building handbook. Specialising in 2stroke performance services such as porting, cylinder repair and sleeving, crankshaft and engine rebuilding. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. Present a new 4 stroke engine concept invented by andrew feliks.
The 2stroke engine compresses with a stroke upward and exhausts with a stroke downward. The piston crown opens and closes the exhaust and transfer ports. In this cycle there are 4 different strokes, they are 1. Basic concept of tuning a 4 stroke petrol engine the. The valves are operated by the action of the camshaft, which has separate cams for the inlet. Here are some useful tips for tuning your gas engine. I am very proud of the riders i helped and sponsored and there is an appendix.