2 stroke cylinder porting software

It seems that progress is slow among 2 stroke software developers and that accurate data taken from a cylinder is not put to its best use. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. The computer allows us to compare the variables with existing engines. We also specialize in building high performance watercraft. You will see why i would choose his shop to do my cylinder. Today were still dealing with porting, time areas, angle areas sometimes and exhaust systems tuned for high output. Professional 2 stroke cylinder porting bikeman performance. Im going to show you my single skidoorotax 33578mm x 70mm vs my skidoorotax 340 tnt78mm x 70mm intake ports for comparison. Determine what port is required for a specific rpm and compression. The port heights, widths, areas, directions they flow, and relationships to one another all have a significant influence on how the engine will behave. Basic 2stroke engine tuning information joe hunt rc. Always measure the cylinder you are working on to see if it has been previously modified. 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. Those of us who have grown up in the japanese twostroke.

Dynomatontwostroke is a dosbased simulation that was originally released in the mid1990s. Design and simulation of two stroke engines r161 1996. As of 2005 rk tek is porting cylinders using cnc vertical machining centers cnc porting. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Racingsm software has features for many different areas 2stroke 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. The port heights, widths, areas, directions they flow, and relationships to one another. Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder twostroke engines. For my honda cr250r cylinder application the filler would also besides porting fixes it will also stabilize and prevent distortion in my cylinders open deck design. It will simulate one of the cylinders of a multicylinder twostroke engine provided that the cylinders are identical in layout and dimensions and each cylinder has a seperate exhaust and induction system.

There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. I should also mention that my bike is an 07 yz250 with vforce 3 reeds, fmf fatty and powercore 2. Best cylinder porting, engine porting, 2stroke porting, 4. A twostroke cylinder consists of exhaust, transfer, and occasionally inlet ports true inlet ports are only found on piston or rotary valve controlled engines. 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. To the right of the barrel height control are the mean area displays. Two stroke designmodification software the following are spreadsheets for different aspects of 2 stroke designmodification. 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. 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. 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. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together.

Cylinder heads, as manufactured, are usually suboptimal for racing applications due to. Bigger carburetors, higher compression ratios, altered port timings and expansion. I just saw this porting and wanted to be a little different and have it done to my cylinder. Not all porting is the same even the word porting has been mis used over the years. 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. Assign fixed relationships between transfers and exhaust port.

Keep the clear mods button pressed till all mods are cleared. 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. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. Each part of the 2stroke cycle can be evaluated and designed with computer software programs. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. The program calculates the new durations based on the port height adjustments, stock cylinder specs, and barrel height. Lowell horning 2strokeporting 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. Cylinder porting, a related technique, is designed to improve flow characteristics and promote optimum. Calculates port heights from durations, or durations from port heights. Bimotion 2 stroke software has been commercially available and in professional use since 1991. 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. Bigger carburetors, higher compression ratios, altered port.

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. Relation of port timing to peak rpm, and port timing for a specific 48cc cylinder, this doesnt. 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. Many things will affect the power delivery of twostroke motorcycle engines. I did not fool with the shape of any ports in the cylinder. Some 2 stroke porting enhancements you can make to make airflow better in your engine with simple tools. Thank you for your interest in dynomationtwostroke designed for windows98xp. Two stroke cylinder porting, two stroke porting, blaster porting, banshee porting, high performance porting, 2 stroke porting, yamaha cylinder porting, atv porting. Edge chamfering and cylinder porting for twostroke. Service masterlist for 2 strokes finish line engines. Edge chamfering is a surface finishing technique that smoothes the edges of cylinder ports so that piston rings seat properly. Right angle porting tools are necessary to properly modify transfer port height and all modifications to the port window. Scavenging system redesign is more accurate, and doing so can entail complete overhauls of cylinder designs. 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.

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. 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. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. 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.

Scavenging system redesign is more accurate, and doing so can entail complete overhauls of. That is measured from the gasket surface at the top of the cylinder down to the peak of the exhaust port. If you dont have excel or have a version of excel that doesnt work with macros then you can buy microsoft office 365. 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. Everything you need to know about the twostroke cylinder. The clear mods button clears all porting mods, restoring the stock cylinder timing. I wanted to just enter the actual port area as measured but there is no way to do it. 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. May 22, 2014 i would have eric do my cylinder for sure. We use computer design software to maximize power and torque at any elevation. Cylinder porting takes time, patience, special tools and more than a basic knowledge of air flow and velocity. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. With my porting, head modifications, and pipe i am able to make. Our porting leads the way in performance and technology.

Right angle porting tools are necessary to properly modify transfer port height and all. These modifications can be extremely effective when used in the right combinations. 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. A high compression 4 stroke can do as little as 120 psi per cylinder. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. 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. Complete porting for most popular applications to deliver the best possible power gains, power. A stock rd350 according to the factory manual has an exhaust port height of 29. If purchasing online please send a printed copy of your invoice with your cylinders and exhaust valves. If you read the cr500 section on erics 2 stroke services.

I knifed the transfer port wings and the intake side bridges. 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. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the 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.

Bimotion 2stroke software has been commercially available and in professional use since 1991. These show the required mean port areas, given the current port timings and the rpm value of the graph cursor. 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. Bmp professional cylinder porting price per cylinder. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. We use computer design software to maximize power and torque. 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. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve quantity of the air flow. 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. Those of us who have grown up in the japanese two stroke. Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder two stroke engines.

Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine. I have over 38 years experience working with some of the best 2 stroke engineers in the world. 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. When set to calculate duration fig 2, you enter the port height adjustments.