From beginners in porting,to brazen speed phreaks, this is a great tool if your not a molecular, thermohydrus calculus genius space physicist math scientist. Feb 16, 2017 two stroke cylinder porting tips watch this before you start cutting. Port matching, porting and trenching twostroke engine cases. We now have a simple 2 stroke expansion chamber design program. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy. Simple twostroke cylinder porting tutorial youtube. 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 2 stroke tuner lufo racing, this software is directed for all 2 stroke. Finally, enter the exhaust duration of 184deg and the peak power speed of 12500 revsmin and click the design now button. Calculate the needed exhaust and transfer port durations to match the.
Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Mota for windows slide show of features millions of tuning variations possible. Really cool two stroke cylinder porting software youtube. Two stroke cylinder porting tips watch this before you start cutting.
Enthusiasts, tuners, mechanics, gp, drag racing, mx, enduro. Note that you do not require a paypal account as you can use your credit card. Specialty tools for porting 2 stroke, 4 stroke, cylinders, cylinder heads, 2 stroke case porting, and intakes. Each intake port can be locked to a fixed timing relation with the exhaust port. These modifications can be extremely effective when used in the right combinations. Porting and polishing two stroke motorcycle engines. Two stroke engine porting zmod for android apk download. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. The inlet port opens 30 after bdc and closes 79 after tdc. The following are spreadsheets for different aspects of 2 stroke designmodification.
Bimotion 2 stroke software has been commercially available and in professional use since 1991. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. The morbidelli 125 twin road racer is a rotary valve engine. Jun 24, 2007 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. 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. Petals reed valve in the 2 stroke engine with reed valve admission, the identification of petals more adapted to the reed valve and to the engine is essential to maximize the performance starting from the intake phase. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2 stage or 3stage diffuser. Time between exhaust port opening and transfer ports opening. 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. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Part of the problem is understanding the pulse or charge nature of the airflow in a 2 stroke engine. Determine the level of porting you wish to achieve before you start cutting or grinding. Jul 18, 2017 porting and polishing two stroke motorcycle engines. Porting and polishing twostroke motorcycle engines.
Softengine engine simulation software production 2tbase seven software. Next enter the cylinder bore and stroke which are 40. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. 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. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy. Im working on gathering enough parts to build a triple cylinder rd400 and at some point ill need to sort out the porting and exhaust. Dynomationtwostroke engine simulation motion software, inc. Crankcase and cylinder porting is probably the most controversial subject among performance 2 stroke engine builders. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. Contents chapter 1 introduction 9 chapter 2 the cylinder. You should only rely on the experience of the very best.
This kit is one of the best options for doing mx and dirt bikes of the 100cc, 80cc, 70cc, 50cc, and even down to 30cc, 2 stroke variety. All engine development is done exclusively with tsr two stroke racing engine design software and. The software in addition to defining the geometry of the insert, it also indicates the processing steps for its craft realization. Bigger carburetors, higher compression ratios, altered port timings and expansion. Apr 08, 2007 im looking to start doing all my own porting and was thinking about buying the tsr 2 stroe porting software, has anyone used it, and is there any better software out there. This expansion chamber is not the product of simple correlations as for other products that abound on the web, but an automatic design created by mota which is a full wave action 2 stroke engine simulator.
Many things will affect the power delivery of two stroke motorcycle 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. You should read about how the two stroke enigne works before you attempt this. For port work, one company that will help you is 2strokeporting. Purchase the porting tools you need at our online store. Ask our shadetree mechanics 2 stroke wizard pipe builder. This program is not a part of mota, but it has been put together.
If you are aiming for these qualities, modifying your 2stroke engine is a great. Show flow efficiency by rpm help you modify port better before action. Twostroke waveaction engine simulation motion software. The official home page of the 2 stroke wizard tuned pipe 4t exhaust header wizard software. The best thing about bolton modifications is if you dont like what the product.
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. Purchase with immediate download from digital river, shareit. Lowell horning 2 stroke porting master modified as i felt fitting you have two three really critical elements in a 2 stroke engine that generate power and are porting areas that yield real results if done correctly and in concert with intakecombustionexhaust quality purpose built pipe is critical. Those of us who have grown up in the japanese two stroke. The newest info i have is the two stroke tuners handbook by gordon jennings. We also have a simple 2 stroke expansion chamber design program.
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. Hi performance two stroke porting software program youtube. 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. Softengine engine simulation software 2tbase seven software. These are the files that can function manually without using macros by using open office. Fink is open source distribution software specifically designed for porting applications in mac os x. My name is ed erlenbach, im a private tuner specializing in yamaha rd and tz performance in southern california. Sep 30, 2012 kick ass and take names with this baby software located on the web at this address.
Two stroke engine and exhaust design software north. Software for fine tuning and design of two stroke engine by. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. This can easily ruin your eninge, but can also increase performance by alot. The piston crown opens and closes the exhaust and transfer ports. Port heights port durations required ranges of port mean areas possible ring flutter rpm mean piston speed suggests carburettor size power meter you input expected bmep value adjust port shapes for target areas in cad window. Heres how shaving off miniscule ammounts of metal can drastically improve your speed. Each part of the 2stroke cycle can be evaluated and designed with computer software. The software does complete cycle simulation of the whole internal combustion process including the gasdynamics in the pipesducts, ports and plenums air boxes, boost bottles, exhaust boxes etc. How to tips from tj on porting and polishing 2 strokes. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower.