2 stroke cylinder porting software for free

May 07, 2018 for my honda cr250r cylinder application the filler would also besides porting fixes it will also stabilize and prevent distortion in my cylinder s open deck design. Each intake port can be locked to a fixed timing relation with the exhaust port. Our porting leads the way in performance and technology. Cc specialty tools 2 stroke kits include 90 degree rotary tools for 2 stroke transfer ports and working from the inside of the cylinder combustion chamber. 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. These show the required mean port areas, given the current port timings and the rpm value of the graph cursor. I should also mention that my bike is an 07 yz250 with vforce 3 reeds, fmf fatty and powercore 2.

The cylinder pressure drops, and the fresh charge transfers thru the transfer ports, over the top of the piston, and out the. It enters via the intake port as the piston rises into the crankcase and then is transferred to the combustion area via the transfer ports as the piston descends and the piston top uncovers the port opening to the cylinder. We call upon two stroke genius ted boyko for the final word. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the competition wont. Thanks for the info, ive been reading all macdizzys stuff, thats where i got that boost bottle post but everyone here thinks hes an idiot. Dynomatontwostroke is a dosbased simulation that was originally released in the mid1990s. Big bore kits specializing in offroad kits, all inclusive with over boring, porting, cylinder plating, head mods, exhaust valve mods, wiseco prolite piston kit and cometic gasket kit. Im going to show you my single skidoorotax 33578mm x 70mm vs my skidoorotax 340 tnt78mm x 70mm intake ports for comparison. I dont know that i would consider this information the indisputable truth and it is fairly specific to these particular smaller cc cylinders, but it can be a very enlightening as to observable relations in altering 2 stroke port timing, enjoy. Porting your 2 stroke motorized bicycle engine duration. 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.

The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Everything you need to know about the twostroke cylinder. The worlds leading 2stroke engine simulation software for 3. Cylinder porting, a related technique, is designed to improve flow characteristics and promote optimum engine performance. At least 512 mb ram and 2 gb free in the hard disk for best windows performances. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. It requires values for stroke, piston height, conrod length, and. It keeps track of the pressure waves moving in the intake and exhaust systems and their effects on portpipe pressures and flow. 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. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. The ports found within a twostroke cylinder in combination with the. New version of 2t exhaust calculator it is a freeware 2 stroke.

Jun 06, 2017 i feel like i would benefit more from the midhigh porting but i think i remember seeing somewhere that that is geared more towards a and b class racers and would be hard for someone like me to manage. Great book, but ill guess the world has moved past that info. The port heights, widths, areas, directions they flow, and relationships to one another all have a significant influence on how the engine will behave. Ways to increase low rpm torque, and why do they work. Free 2 stroke expansion chamber calculator software update. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. 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. In this example the dimensions are 45mm and 27mm respectively. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. 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. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Sep 30, 2012 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. If you are aiming for these qualities, modifying your 2stroke engine is.

Timing in a piston controlled port is always symetrical. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the. My spare cylinder is a upgraded semi open deck with 4 support bridges but ill fill it too. I feel like i would benefit more from the midhigh porting but i think i remember seeing somewhere that that is geared more towards a and b class racers and would be hard for someone like me to manage. Edge chamfering and cylinder porting for two stroke engines edge chamfering is a surface finishing technique that smoothes the edges of cylinder ports so that piston rings seat properly. 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 might want to show this to your guy and ask him to compare it to your cylinder, then call you with his findings before starting the porting. A typical ktm 2 stroke from the factory will easily do 210 psi and pound out plenty of torque more than a 250 or 300cc 4 stroke could ever hope for. Cylinder porting tools artco american rotary tools company. Softengine engine simulation software 2tbase seven software.

Two stroke design instead you can enter the data of your cylinder with extreme facility and precision, and then analyze the port areas and the timing area in the engine cycle timing for each phase. Software for fine tuning and design of two stroke engine. 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. When porting begin to open and closed in crankshaft degrees duration, we will undoubtedly be modifications on the right path. Porting and polishing two stroke motorcycle engines. Download my free calculators spreadsheet to check your computers ability. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. 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. Those of us who have grown up in the japanese two stroke.

Porting and polishing twostroke motorcycle engines. Porting the cylinder designed by engineers to create energy in a certain rpm range resulting in. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. Double cut cylinder shape with radius end sf5l4, size. Service masterlist for 2 strokes finish line engines. Complete porting for most popular applications to deliver the best possible power gains, power delivery, and reliability. Two stroke cylinder porting tips watch this before you. Scavenging system redesign is more accurate, and doing so can entail complete overhauls of cylinder designs. Right angle porting tools are necessary to properly modify transfer port height and all modifications to the port window. At least 512 mb ram and 2 gb free in the hard disk for best windows. The clear mods button clears all porting mods, restoring the stock cylinder timing.

Not all porting is the same even the word porting has been mis used over the years. Assign fixed relationships between transfers and exhaust port. Tips on how to port a two stroke cylinder, what to donot do and how to do it right. Twostroke waveaction engine simulation motion software, inc. Two stroke engines without reed or rotary intake valves are piston port controlled.

Pointing to a freshly modified honda cr500r cylinder, boyko says, one wrong cut, one slip, and i have to eat the cost of this whole thing. New version of 2t exhaust calculator it is a freeware 2 stroke expansion chamber exhaust calculator program download at. The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. Transfer is sometimes called bypass as this port enables the fresh fuelair mix to pass by the piston and enter the upper cylinder. Racingsm software has features for many different areas 2 stroke exhausts development, drag racing features, simulators, carburetor tuning, connectingrod analysis etc with all this knowhow along with lufo racing heritage, we believe this is a very fair price. Port matching, porting and trenching twostroke engine cases. 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. Two stroke engine and exhaust design software north. The intake and transfer ports allow fuel mixture to enter the cylinder, and.

Really cool two stroke cylinder porting software youtube. There is no 2 stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 single cylinder and our modules will work flawlessly. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer. A dremel is for wood working or engraving your favorite paper weight, but not for porting and polishing on a 2 stroke. 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. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. Simple twostroke cylinder porting tutorial youtube. Bigger carburetors, higher compression ratios, altered port timings and expansion. Port timing basics airgasoline enters the engine from the carburetor at a ratio close to 15. 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. Performance porting of vintage 2strokes vintage dirt. Mspec twostroke performance services millennium technologies.

An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. Many things will affect the power delivery of twostroke motorcycle engines. The newest info i have is the two stroke tuners handbook by gordon jennings. 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.

A high compression 4 stroke can do as little as 120 psi per cylinder. Moreover, interest factors like the port parameters are computed even if the. Keep the clear mods button pressed till all mods are cleared. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. As of 2005 rk tek is porting cylinders using cnc vertical machining centers cnc porting. Head machining to suit unleaded or race fuel to get a perfect burn from your engine. Calculates port heights from durations, or durations from port heights. 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. It will simulate one of the cylinders of a multi cylinder two stroke engine provided that the cylinders are identical in layout and dimensions and each cylinder has a seperate exhaust and induction system. The tool handles and bits are the secret to porting. Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder two stroke engines. Intake by piston port and by rotary valve systems is also included in the program. We use computer design software to maximize power and torque at any elevation.

This is the length from the piston face to the end of the exhaust flange. 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. Just a quick update on the progress of the freeware 2 stroke expansion chamber calculator software. 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. Two stroke designmodification software the following are spreadsheets for different aspects of 2 stroke designmodification. That is, the piston will close the port the same number of degrees after tdc as it opened it before tdc in this setup. Website designed at homestead list your business for free. The most popular source for cylinder porting tools and accessories is cc specialty in tennessee 18007626995. Below is the porting diagram for the 78 mt125r iii cylinder honda pn 1210032510, the final configuration of your cylinder used on the 125cc road racer. Complete porting for most popular applications to deliver the best possible power gains, power. Aug 09, 2014 this article is an overview of how porting is performed and how it can benefit your performance demands. Late model cylinder castings are extremely efficient and, in most cases, not much can be done to increase air flow without destroying the velocity of the charge.

Relation of port timing to peak rpm, and port timing for a specific 48cc cylinder, this doesnt. Next enter the cylinder bore and stroke which are 40. Artco tools carries a great selection of cylinder porting tools including porting tools, porting abrasives, carbide burs, and more. To the right of the barrel height control are the mean area displays. Edge chamfering and cylinder porting for twostroke engines. Bottom of inlet port location entering a value will produce inlet timing figures. Cylinder porting takes time, patience, special tools and more than a basic knowledge of air flow and velocity.

Thank you for your interest in dynomationtwostroke designed for windows98xp. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. Two stroke cylinder porting tips watch this before you start cutting. The diameter is the internal diameter of the exhaust flange. Two stroke cylinder head mods we can modify cylinder heads for high altitude, fuel type, or any conceivable configuration. Some 2 stroke porting enhancements you can make to make airflow better in your engine with simple tools. 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. These modifications can be extremely effective when used in the right combinations. Software that can accurately be used to design engines and mechanical systems is more in the order of. Files are great for busting out of prison or maybe a gal to do her nails, but not for professional porting of any kind.