Contemporary twostroke technology was introduced initially to suzuki, and later to yamaha in japan when ernst degner defected from east germany to join suzuki. Assign fixed relationships between transfers and exhaust port. Hi performance two stroke porting software program youtube. Kick ass and take names with this baby software located on the web at this address. Porting calculator calculate the amount of exhausttransfer overlap to see if you need to change the port height for. Porting and polishing two stroke motorcycle engines. Porting torque vs hp page 2 outdoor power equipment forum. This means that to run motax, you will need a post 2010 computer which is preferably a desktop, driven by an intel i7 4core processor.
Many things will affect the power delivery of twostroke motorcycle engines. Port matching, porting and trenching twostroke engine cases. The computer allows us to compare the variables with existing. There is no 2 stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 singlecylinder and our modules will work flawlessly. Heres how shaving off miniscule ammounts of metal can drastically improve your speed. The software in addition to defining the geometry of the insert, it also indicates the processing steps for its craft realization. Softengine engine simulation software 2tbase seven software. The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. Diy moto fix website for fixing rebuilding repairing. The first 3 videos will cover simple mapping of the exhaust port and transferring that in to 2t exhaust calc software for the purpose of expansion. If i am unable to contact this gss race porting shop. Two stroke engine and exhaust design software north. The newest info i have is the two stroke tuners handbook by gordon jennings.
With my porting, head modifications, and pipe i am able to make 110. These modifications can be extremely effective when used in the right combinations. Great book, but ill guess the world has moved past that info. Bimotion 2 stroke software has been commercially available and in professional use since 1991. By combining designs which degner brought from mz with japanese technology in the field. By combining designs which degner brought from mz with japanese technology in. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. 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. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the. Bimotion 2stroke software has been commercially available and in professional use since 1991.
Two stroke engine technology database, large two stroke engine building porting section. From a 49cc racing engine, to a gp 125 engine, or a 1500 mercurial triple engine, or a 250 kart engine, racingsm software suits all. 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. The worlds leading 2stroke engine simulation software for 3. Everything you need to know about the twostroke cylinder. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. Service masterlist for 2 strokes finish line engines. Thats over a 50% increase in horsepower and 11 ftlbs more torque. Apr 08, 2007 check out mcdizzys 2 stroke page, there is alot of info on there on some of the software available, as well a cylinder port mapping. Porting 2 stroke many things will affect the power delivery of twostroke motorcycle engines. Porting and polishing twostroke motorcycle engines. We use computer design software to maximize power and torque at any elevation.
In the design form first select the water cooled and reed induction options from the dropdown menus. Racingsm software for 2stroke development, also for 4strokes in some modules, create 2t exhaust, create 2stroke exhaust. We now have a simple 2 stroke expansion chamber design program. Dynomationtwostroke engine simulation motion software, inc. Twostroke waveaction engine simulation motion software, inc. This is the third of a series of videos on the topic of 2 stroke engine ports that you need to know if you are intending to modify your engine. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. A dremel is for wood working or engraving your favorite paper weight, but not for porting and polishing on a 2 stroke. Many things will affect the power delivery of two stroke motorcycle engines. Even if you gain no power porting but you move the exact same power up 2k youve made a faster stronger saw. Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines.
Complete porting for most popular applications to deliver the best possible power gains, power. Mspec twostroke performance services millennium technologies. Im going to show you my single skidoorotax 33578mm x 70mm vs my skidoorotax 340 tnt78mm x 70mm intake ports for comparison. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Software for fine tuning and design of two stroke engine by. Petals reed valve in the 2stroke 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. Some 2 stroke porting enhancements you can make to make airflow better in your engine with simple tools. A diesel is tourqe but a 2 stroke is hp a diesel doesnt need rpm to make power but its the opposite with a saw. Oct 04, 2011 changing the power of 2 stroke engine 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. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. Since modifying the 2 stroke engines require not only a big budget in funding but also modification strategies. Software for fine tuning and design of two stroke engine. Each part of the 2stroke cycle can be evaluated and designed with computer software programs.
Our porting leads the way in performance and technology. I just saw this porting and wanted to be a little different and have it done to my cylinder. Diy moto fix website for fixing rebuilding repairing your. The cylinder pressure drops, and the fresh charge transfers thru the transfer ports, over the top of the piston, and out the. Check out mcdizzys 2 stroke page, there is alot of info on there on some of the software available, as well a cylinder port mapping. Bigger carburetors, higher compression ratios, altered port timings and expansion. Rk tek uses the latest in 2 stroke design and simulation software, coupled with, practical knowledge that can only be gained through experience and trial and error, to properly modify any engine. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. Cc specialty tools will always be the company to go to for all your porting and polishing tools and equipment. There is no 2stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 singlecylinder and our modules will work flawlessly. Best cylinder porting, engine porting, 2stroke porting, 4. The newest info i have is the twostroke tuners handbook by gordon jennings.
Dynomatontwostroke is a dosbased simulation that was originally. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the competition wont. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. I have over 38 years experience working with some of the best 2 stroke engineers in the world. Since modifying the 2stroke engines require not only a big. Processors with a lower number of cores will run the motax expansion chamber optimiser, as will the latest. Calculates port heights from durations, or durations from port heights. 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. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Double cut cylinder shape with radius end sf5l4, size. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Macdizzys two stroke technology exchange trx yfs yfz. 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.
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. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. Support for windows not only makes the program easier to use, but it also allows the growing number of two stroke enthusiasts to use this powerful simulation on windows. Careful care must be taken to assure that engine will not end up making less power then it did before the engine porting was done.
The high performance 2stroke engine is a pulse resonance engine which means that the operation in general and the scavenging in particular is not only. Contemporary two stroke technology was introduced initially to suzuki, and later to yamaha in japan when ernst degner defected from east germany to join suzuki. Not all porting is the same even the word porting has been mis used over the years. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port.
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 if you are just getting started get g. Mota for windows slide show of features millions of tuning variations possible. 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. Two stroke cylinder porting tips watch this before you start cutting. Visit the glamis sand dunes and see the trx250r, lt80s yfs200s blasters and banshees yfz350s in action. Unless you have a deep passion for two stroke 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. Files are great for busting out of prison or maybe a gal to do her nails, but not for professional porting of any kind. 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. It keeps track of the pressure waves moving in the intake and exhaust systems and their effects on portpipe pressures and flow. Macdizzys two stroke technology exchange the two stroke engine capital of the internet. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine.
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