2 stroke porting books

Buy products related to porting tools and see what customers say about porting tools on free delivery possible on eligible purchases. Two stroke cylinder porting tips watch this before you. Have you tuned a two stroke and wondered when your exhaust and transfer ports need to open in order to get maximum power at the rpm you want. I started reading these about a year ago now and ive learned so much in just the short time already its mind boggling. It can be said that heat engine is equipment which generates thermal energy and transforms it into mechanical energy. I have followed with interest the various threads on porting saws to improve performance. Below is a link to a discussion discussing 2 stroke books. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at the end of the converging section. I am still scared to tackle it, because i dont really know what to do. Port matching, porting and trenching twostroke engine cases duration. 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. The 2stroke high speed diesel engine concept was investigated in 1999. Using the search function and purchasing two books on 2 strokes i was able to learn enough information to woods port my saws.

Starting with the piston at top dead center tdc 0 degrees ignition has occurred and the gasses in the combustion chamber are expanding and pushing down the piston. You should only rely on the experience of the very best. Jenning vs graham bell, 2 stroke tunning books motorcycle. Blair of queens university belfast, and published by the society of automotive engineers.

I would really like to see some new two stroke porting books. Anyone interested in doing their own engine porting, or taking the time to learn the intimate secrets of 2 stroke engines should take the time and read each of these books. Two stroke principles although a two stroke engine has fewer moving parts than a four stroke engine, a two stroke is a complex engine with different phases taking place in the crankcase and in the cylinder bore at the same time. Advances in the design of twostroke, high speed, compression. Today, we take these old engines, of many different brands and designs and add modern technology. The openings will be displayed in degrees after top dead centre atdc, degrees.

Specialty tools for porting 2 stroke, 4 stroke, cylinders, cylinder heads, 2 stroke case porting, and intakes. A two stroke cylinder consists of exhaust, transfer, and occasionally inlet ports true inlet ports are only found on piston or rotary valve controlled engines. 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. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. Everything you need to know about the twostroke cylinder. Cleaningup the rough edges of the port windows inside of the cylinder bore is really all you need to do to the port windows, as anything further, and youre messing with the port timing keep in mind, were out to build a little twostroke screamer, not make a boat anchor out of your cylinder.

For instance, if an engine has been properly designed for medium output and a midrange power peak, raising the. The 14sr kit is the 2 stroke porting kit for 100cc and under mx bikes, chainsaws, scooters, mini bikes, rc vehicles, dirtbikes, and all small displacement 2 strokes. Who should consider twostroke porting modifications. Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance tuning. Dependability, durability and race track proven 2 stroke cylinder porting come in 3 stages, we can set you up with a package or custom port a cylinder just for your application. 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. This pressurizes the crankcase causing the reed valve to close. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. The website does not intend to compeed with any other website dealing with 2 stroke tuning, and the information shared is not at all as thorough as what you can get from reading the books. Two stroke cylinder porting tips watch this before you start cutting. This is my collection of two stroke performance motor textbooks. Nov 14, 2019 have you tuned a two stroke and wondered when your exhaust and transfer ports need to open in order to get maximum power at the rpm you want.

Those of us who have grown up in the japanese twostroke. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. I know that widening ports is a start, but raising and lowering teh intake and exhaust timing, and the transfers, well, i dont git. Feb 08, 20 well i have been reminded lately that this is a dirtbike forum where i can ask questions so i figured id give it a shot. Jul 18, 2017 porting and polishing two stroke motorcycle engines. Well i have been reminded lately that this is a dirtbike forum where i can ask questions so i figured id give it a shot. 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. I know there are newer books about this subject, but any good ideas they contain surely came from this book years ago. A simple 3 stage two stroke exhaust calculator based on formulas of g. Anyone interested in doing their own engine porting, or taking the time to learn the intimate secrets of 2 stroke engines should take. 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. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field.

The piston crown opens and closes the exhaust and transfer ports. A dremel is for wood working or engraving your favorite paper weight, but not for porting and polishing on a 2 stroke. Start your service order now with our service order form. He is in my view a good candidate for reading due to his knowledge of vintage and modern 2 stroke piston port engines. I recommend you use the search function for the words port timing, duration, porting and any other word associated with porting a chainsaw. Reading the above books, its important to keep in mind that both authors porting generalizations refer to comparisons among fullydeveloped oldschool racing engines, and shouldnt be taken out of context for modification purposes. Millennium technologies provides repair and maintenance services for cylinders and cylinder heads, and manufactures nickel silicon carbide plated cylinders for a variety of engines, including motorcycles, snowmobiles, race cars, karts, dirt bikes and watercraft. Enthusiasts, tuners, mechanics, gp, drag racing, mx, enduro. A twostroke or twocycle engine is a type of internal combustion engine which. A rare technical guide to the fundamentals of the crank train, cylinder heads, expansion chambers, port timing, crankcase pumping, carburetion and ignition. They are so simple and fun that ive always enjoyed tinkering with them. This coefficient kh is called the horn coefficient, with typical values between one and two. Engineering acousticssonic supercharging of 2 stroke engines. The port heights, widths, areas, directions they flow, and relationships to one another all have a significant influence on how the engine will behave.

But once you get through it, 2 stroke engines will be as familiar to you as your own hands. These modifications can be extremely effective when used in the right combinations. Determine the level of porting you wish to achieve before you start cutting or grinding. The only problem is finding his books due to them being discontinued and published only for a short period. Head machining to suit unleaded or race fuel to get a perfect burn from your engine. I started working on racing snowmobiles when vintage was new from the show room. If you are aiming for these qualities, modifying your 2stroke engine is. Files are great for busting out of prison or maybe a gal to do her nails, but not for professional porting of any kind. Since modifying the 2stroke engines require not only a big.

Two stroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. Test your own theories on porting and exhaust pipe. The morbidelli 125 twin road racer is a rotary valve engine. You dont need fancy expensive stuff to port two stroke cylinders, you can get by with cheap tools and a little creative engineering. I plan to study them from front to back, before i attempt any porting on my new dio cylinders. Engineering acousticssonic supercharging of 2 stroke. Oct 04, 2011 changing the power of 2 stroke engine is really very simple when you know the basic techniques of 2 stroke engines. 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. Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines.

Tractorsport flowbench forum archive view topic two. 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. My porting setup affordable and functional 2 stroke tuning. Piston port induction is an alternative to reed valves on a 2 stroke, so its not necessarily a book on porting but on piston port induction engined bikes like the yamaha at 125s and i believe early yzs and mxs other companies as well, rotax used it longer than anyone else i think prior to the reed valve engines becoming popular, smiler.

Although there is really no shortage of books on the subject of 2stroke tuning and preparation, i knew that an active software programme would be able to offer so much more. My very first successful porting job was achieved because i actually took over a week just studying the piston and cylinder, and the flow through the engine. At about 90 degrees after tdc the exhaust port opens ending the power stroke. Unless you have a deep passion for twostroke 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. If your looking for a big bore, porting, or a complete motor build we have you covered.

I was reading a thread about a 2 stroke versus a 4 stroke and it occurred to me that if the porting, or timing, of a 2 stroke could be changed, that maybe its maximum torque range could be lowered to an rpm comparable to the 4 stroke, and thus swing the same prop as the 4 stroke. Home books advances in internal combustion engines and fuel technologies. 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. There are many ways to boost the power, one of which is by installing a tuned pipe. For port work, one company that will help you is 2strokeporting. Improper routing caused this ca ble to fray above he carburetor. Nov 11, 2010 jenning vs graham bell, 2 stroke tunning books. Precision high performance porting for any outboard. Purchase the porting tools you need at our online store. I used a sharpie marker to make reference marks, measured the port windows, the port timing, etc.

Simply move the slider to the rpm where you want the maximum power to be and it will display the required exhaust and transfer openings. Developed by pedro, with more than 20 000 lines of code, all the knowhow applied to software comes from us and also a lot from the legendary portuguese 2stroke tuner lufo racing, this software is directed for all 2stroke. Eric gorr racing offers allinclusive porting packages for all types of 2stroke and. Twostroke principles although a twostroke engine has fewer moving parts than a fourstroke engine, a twostroke is a complex engine with different phases taking place in the crankcase and in the cylinder bore at the same time.

Small values of kh are best suited to grand prix engines with narrow power bands, larger. Porting and polishing twostroke motorcycle engines. This article is an overview of how porting is performed and how it can benefit your performance demands. The ports found within a twostroke cylinder in combination with the exhaust system. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Heres how shaving off miniscule ammounts of metal can drastically improve your speed. You can also save and load the data by using the provided functions. How to tips from tj on porting and polishing 2 strokes. From wikibooks, open books for an open world goodreads helps you keep track of books you want to read. Lecture 2 two stroke and four stroke engines, working principles, applications types, power and efficiency heat engine is a machine for converting heat, developed by burning fuel into useful work. Nov 02, 2019 for introductory material on 2 stroke engines please see the following links. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Those of us who have grown up in the japanese two stroke.

The inlet port opens 30 after bdc and closes 79 after tdc. Improving the performance of twostroke motorcycle with tuned adjustable exhaust pipe article pdf available in research journal of applied sciences, engineering and technology 12. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy. How does 2 stroke porting compare to 4 stroke porting. In the case of schnuerle ported and loopscavenged engines, intake and. A man named aaen olav aaen performance had some published work about piston port 2 stroke technology and performance. Most of the errors is to choose a less appropriate combination of engine components so that the engine actually ran worse than standart, ever experienced. If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy.

Two stroke marine outboard applications impose several uniquely individual circumstances that are very different from other two stroke engine uses. Tips on how to port a two stroke cylinder, what to donot do and how to do it right. Piston port induction is an alternative to reed valves on a 2stroke, so its not necessarily a book on porting but on piston port induction engined bikes like the yamaha at 125s and i believe early yzs and mxs other companies as well, rotax used it longer than anyone else i think prior to the reed valve engines becoming popular, smiler. Contents chapter 1 introduction 9 chapter 2 the cylinder. An excellent academic book on the theory behind performance tuning for 2stroke motorcycles. Today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the. Yamaha is still at it, i would like to pull apart a brand new yz250 and see whats. However, you shouldnt just pick any business that you can find anywhere. Bigger carburetors, higher compression ratios, altered port timings and expansion.

Tile cable should route through the center of the headstay brackets. Many things will affect the power delivery of twostroke motorcycle engines. Mspec twostroke performance services millennium tech. Pdf improving the performance of twostroke motorcycle.