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. This 2 stroke engine animation, article and diagrams are courtesty of. Jenning vs graham bell, 2 stroke tunning books motorcycle. The litterature on which the website is based on, are the books. Two stroke tuners handbook by gordon jennings goodreads. Tractorsport flowbench forum archive view topic two. Before you begin, powerwash the engine and rhe resr of the vehicle to reduce the risk of dirt and debri, falling ilho the engine. To familiarize yourself with two stroke engine tuning, read the two stroke tuners handbook by gordon jennings as well as two stroke performance tuning by a. Remove the head and then cut the clay down the middle with a sharp, wet knife.
Over the years i added several other books on the subject to my library, the two books mentioned. We look at how the exhaust port timing edge is determined by the port in. Nov 11, 2010 jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. But these changes will increase the power only if you know what you are doing. Gordon jennings handbook is considered the bible of two stroke tuning. Any recommendations on a book i can go buy that covers 2 stroke basics, theory, repair, etc etc. We look at how the exhaust port timing edge is determined by the port in relation to the top of the piston and how that. 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. As you go though the jetting and tuning process, be sure to compare your plugs to the chart weve provided below. Gordon jennings 2 stroke tuning pdf if this is your first visit, be sure to check out the faq by clicking the link above. Written in the early 1970s by cycle magazine writer and engine tuner extrordinare you can learn more about a 2 stroke engine from this book then you can imagine.
Jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. But once you get through it, 2 stroke engines will be as familiar to you as your own hands. The inlet port opens 30 after bdc and closes 79 after tdc. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics.
Contents chapter 1 introduction 9 chapter 2 the cylinder. Four stroke carbs need to atomize the fuel more so than a two stroke carb because so much of the fuel shears along the intake port and separates from the mixture stream. In an attempt to acquire that understanding i began a study of the highspeed, highoutput two stroke engine that has led to the collection of a minor library of text books and sae papers. My interests are woods porting for personal use and friends only. This section describes the basic function and the most. Bells four stroke performance tuning book, this book goes into extreme detail regarding performance tuning a two stroke engine. The website does not intend to compeed with any other website dealing with 2stroke tuning, and the information shared is not at all as thorough as. The other is jennings and the academic books are blair and heywood. Buy two stroke tuners handbook by jennings, gordon isbn. This book, now long out of print, was the bible of twostroke performance engine builders and racers and its a treasured addition to any mechanics library. Gordon jennings 2 stroke tuning pdf everything2stroke. Bigger carburetors, higher compression ratios, altered port timings and expansion. My shipping address is at us chrome and they will always accept packages because they are part of the food production and defense industries.
Fit the head gasket and head and turn the crank to move the piston just past tdc. His port time equations dont even include rpm, you input the dime. Very few other books on engine development and most of these are either devoted to car engines or are. I started reading these about a year ago now and ive learned so much in just the short time already its mind boggling. If i remember right, jennings was the editor of a great magazine, cycle. Get it if you want to squeeze peak performance out of your 2 stroke. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. All you ever wanted to know about performance tuning two stroke engines. For introductory material on 2 stroke engines please see the following links. Gordon jennings was a life long motorcycle enthusiast and writer who worked as an editor for cycle magazine and motorcyclist magazine. 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.
His tech articles were the first things we read on the way back from the mailbox. Throughout this book it will be assumed, inconvenient though that assumption may occasionally be, that the reader has progressed to at least a superficial knowledge of the manner in which a pistontype internal combustion engine with particular reference to those operating on the two. Two stroke engine porting, head mods and pipes two stroke tuning advice from the experts at bimotion. Two stroke tuners handbook gordon jennings free download as pdf file. Twostroke tunert hanpbook coro fundamentals airey clo. Those of us who have grown up in the japanese two stroke.
Gordon jennings twostroke tuners handbook was written in the early heyday of twostroke, motorcycle roadracing, dragracing and motocross. The only problem is finding his books due to them being discontinued and published only for a short period. While being from the 1980s, bells wealth of experience and experimentation really lifts the book. Get it if you want to squeeze peak performance out of your 2 stroke engine. A couple of escellant books on this subject are a g bells performance two stroke tuning and dr. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. 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. When the kick starter on a two stroke engine is pushed down the piston goes up and an area of low pressure is instantly. A man named aaen olav aaen performance had some published work about piston port 2 stroke technology and performance. Twostroke tuners handbook by gordon jennings, paperback. They are so simple and fun that ive always enjoyed tinkering with them. Some of the big parts distributors will be closed for extended periods of time and current service turnaround time is about 4 weeks through may. 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. 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.
The piston crown opens and closes the exhaust and transfer ports. How to enhance a 2 stroke engines ports with piston ramps transfer port enhancement with piston ramp on page 117 of two stroke tuners handbook gordon jennings wrote how one could grind transfer and exhaust port ramps into the piston crown to test porting ideas without grinding on the more expensive cylinder. Here is a link to the two stroke performance handbook by gordon jennings. Find all the books, read about the author, and more. Gordon jennings two stroke tuners handbook is conisdered the two stroke engine tuners bible.
Carefully pull one strip of clay off the piston and then measure the thickness of the clay left on the piston. Please correct me if im wrong in what i gleaned from it. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. Blair design and simulation of two stroke engines by dr. Once yoll remove rhe cylinder, sruff a clean rag down inro rhe crankcases. Discussion in scooter guides started by sf rider, may 18, 20. The great attraction of the two stroke is its enormous potential, contrasted with its appealing simplicity. Velosolex s 3800 2stroke tuning and engine design books. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. First published in 1989 as tuning new generation engines, this bestselling book has been fully updated to include the latest developments in four stroke engine technology in the era of pollution controls, unleaded and lowlead petrol, and electronic management systems.
He is in my view a good candidate for reading due to his knowledge of vintage and modern 2 stroke piston port engines. May 03, 2012 twostroke tuners handbook by gordon jennings pdf manual. A rare technical guide to the fundamentals of the crank train, cylinder heads, expansion chambers, port timing, crankcase pumping, carburetion and ignition. There are copies all over the net of this book, including. This is in my opinion, hands down the bible of 2 stroke engine tuning.
Mikuni tuning and jetting guide the vintage bike builder. This two stroke engine tuners document contains the formulas, theory, examples and illustrations to literally turn anyone into a professional two stroke engine guru. The morbidelli 125 twin road racer is a rotary valve engine. The way a two stroke motor works causes them to be f. Engineering acousticssonic supercharging of 2 stroke.
How does 2 stroke porting compare to 4 stroke porting. Very interesting book, lots of great insights and tidbits of knowledge even for those who dont plan to tune any two strokes any time soon. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at. Free 2 stroke tuning info, pdfs and software free tuning and maintenance info, plus links to our original tuning pages that started it all off. And to an endless series of experiments, some of them illuminating and many others raising more questions than they have answered. Two stroke tuners handbook jennings moped wiki moped army. Reviewed in the united states on november 20, 2014. 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. Twostroke tuners handbook by gordon jennings pdf manual. A typical state of the art four stroke carb is the kehin cr. Most of my friends and i rode 2 stroke street bikes and welcomed the knowledge that jennings put forth. The port data provided here was derived from the original velosolex s 3800 information, 2 stroke tuners formulae, computer design software and the following books. Four stroke carbs have more jets and finer adjustment screws, plus they usually are equipped with an accelerator pump.
One of the best resources available to the home mechanic. Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance tuning. There are many ways to boost the power, one of which is by installing a tuned pipe. I regard this book to be one of a pair of nonacademic tuning books to own. An excellent academic book on the theory behind performance tuning for 2 stroke motorcycles. Too much compression puts thermal and pressure load on engine and components and. 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. Graham bell starts off by saying that he doesnt believe port time area and its all about the duration the ports are open. I know theres probably lots of info on the internet, but i want a book i can carry around with me and randomly read a section or two when i get to the straighter sections of i5. A slightly better scanned version of the jennings handbook may be found here. Twostroke tuners handbook by gordon jennings and a great selection of related books, art and collectibles available now at. Velosolex s 3800 2 stroke tuning and engine design books. Be the first to ask a question about twostroke performance tuning. Pdf two stroke performance tuning download full pdf.
In this second video of the series on 2 stroke expansion chamber exhausts. Twostroke tuners handbook gordon jennings i heart stella. Nov 26, 2017 in this second video of the series on 2 stroke expansion chamber exhausts. Two stroke tuner s 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. 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. I usually recommend this book along with gordon jennings two stroke tuners handbook. Everyday low prices and free delivery on eligible orders. This 2 stroke engine animation is accompanied by an excellent article with several 2 stroke engine diagrams and indepth explanations of the 2 stroke engine cycle.
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