Two stroke cylinder porting tips watch this before you start cutting. 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. Dynomationtwostroke engine simulation motion software, inc. 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. 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. 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.
Each intake port can be locked to a fixed timing relation with the exhaust port. 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. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Scavenging system redesign is more accurate, and doing so can entail complete overhauls of cylinder designs. Mspec twostroke performance services millennium technologies. Bimotion 2stroke software has been commercially available and in professional use since 1991. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Contemporary twostroke technology was introduced initially to suzuki, and later to yamaha in japan when ernst degner defected from east germany to join suzuki. Porting torque vs hp page 2 outdoor power equipment forum. We use computer design software to maximize power and torque at any elevation. The newest info i have is the two stroke tuners handbook by gordon jennings. Two stroke engine technology database, large two stroke engine building porting section.
Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Great book, but ill guess the world has moved past that info. Dynomatontwostroke is a dosbased simulation that was originally. Software for fine tuning and design of two stroke engine by. I just saw this porting and wanted to be a little different and have it done to my cylinder. Porting 2 stroke many things will affect the power delivery of twostroke motorcycle engines. Cc specialty tools will always be the company to go to for all your porting and polishing tools and equipment. Test your own theories on porting and exhaust pipe design. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. Since modifying the 2stroke engines require not only a big. Service masterlist for 2 strokes finish line engines. In the design form first select the water cooled and reed induction options from the dropdown menus.
Best cylinder porting, engine porting, 2stroke porting, 4. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. 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. Two stroke engine and exhaust design software north. Racingsm software for 2stroke development, also for 4strokes in some modules, create 2t exhaust, create 2stroke exhaust. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. 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. Many things will affect the power delivery of twostroke motorcycle engines. Softengine engine simulation software 2tbase seven software. Software for fine tuning and design of two stroke engine. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine.
Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines. Thats over a 50% increase in horsepower and 11 ftlbs more torque. 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. Files are great for busting out of prison or maybe a gal to do her nails, but not for professional porting of any kind. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the competition wont. Even if you gain no power porting but you move the exact same power up 2k youve made a faster stronger saw. 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.
Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine. A dremel is for wood working or engraving your favorite paper weight, but not for porting and polishing on a 2 stroke. I have over 38 years experience working with some of the best 2 stroke engineers in the world. Intake by piston port and by rotary valve systems is also included in the program. The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. 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. Many things will affect the power delivery of two stroke motorcycle engines. With my porting, head modifications, and pipe i am able to make 110. 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 newest info i have is the twostroke tuners handbook by gordon jennings. Not all porting is the same even the word porting has been mis used over the years. The ports found within a twostroke cylinder in combination with the.
Porting and polishing twostroke motorcycle engines. We now have a simple 2 stroke expansion chamber design program. 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. Twostroke waveaction engine simulation motion software, inc. Hi performance two stroke porting software program youtube. Macdizzys two stroke technology exchange the two stroke engine capital of the internet. 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. 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. 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. Macdizzys two stroke technology exchange trx yfs yfz. 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. The cylinder pressure drops, and the fresh charge transfers thru the transfer ports, over the top of the piston, and out the. Port matching, porting and trenching twostroke engine cases.
Bigger carburetors, higher compression ratios, altered port timings and expansion. Im going to show you my single skidoorotax 33578mm x 70mm vs my skidoorotax 340 tnt78mm x 70mm intake ports for comparison. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. Everything you need to know about the twostroke cylinder. The computer allows us to compare the variables with existing. Assign fixed relationships between transfers and exhaust port. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the. Bimotion 2 stroke software has been commercially available and in professional use since 1991. Some 2 stroke porting enhancements you can make to make airflow better in your engine with simple tools.
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. Diy moto fix website for fixing rebuilding repairing your. If you read the cr500 section on erics 2 stroke services. Visit the glamis sand dunes and see the trx250r, lt80s yfs200s blasters and banshees yfz350s in action. 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. Double cut cylinder shape with radius end sf5l4, size.
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. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. Since modifying the 2 stroke engines require not only a big budget in funding but also modification strategies. Kick ass and take names with this baby software located on the web at this address. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. These modifications can be extremely effective when used in the right combinations. It keeps track of the pressure waves moving in the intake and exhaust systems and their effects on portpipe pressures and flow. Our porting leads the way in performance and technology. 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. Complete porting for most popular applications to deliver the best possible power gains, power.
An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. 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 i am unable to contact this gss race porting shop. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Mota for windows slide show of features millions of tuning variations possible. 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. Diy moto fix website for fixing rebuilding repairing. 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. Porting calculator calculate the amount of exhausttransfer overlap to see if you need to change the port height for. The worlds leading 2stroke engine simulation software for 3.
The software in addition to defining the geometry of the insert, it also indicates the processing steps for its craft realization. Each part of the 2stroke cycle can be evaluated and designed with computer software programs. Sep 30, 2012 kick ass and take names with this baby software located on the web at this address. By combining designs which degner brought from mz with japanese technology in the field. 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. Calculates port heights from durations, or durations from port heights. Processors with a lower number of cores will run the motax expansion chamber optimiser, as will the latest. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port.
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