2 stroke engine porting software torrents

Pete tibbitts emerged victorious with his torqsoft designed exhaust system. Performance porting of vintage 2strokes vintage dirt. Two cycle engine port timing calculator csgnetwork. You should read about how the two stroke enigne works before you attempt this. This 2 stroke engine animation is accompanied by an excellent article with several 2 stroke engine diagrams and indepth explanations of the 2 stroke engine cycle.

The higher resolutions will give finer port outlines, but you must have photo software that will allow you to print in actual size. 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 myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. A 2 stroke engine is an engine in which there are 2 phases in a cycle of operation of the engine. Many things will affect the power delivery of twostroke motorcycle engines. Once thought too polluting, the twostroke engine makes a comeback in advance of stricter fuel efficiency standards. Stroke basically, means the sudden movement of piston which is converted into a rotary motion at crankshaft. Many things will affect the power delivery of two stroke motorcycle engines. Mota 2stroke engine simulation software beven d young. Now, you can either be satisfied with everything at this point, or, you can choose to get more detailed and do some more indepth porting. Cfd modelling of a two stroke engine to predict and reduce short circuit losses 2015320702 one of the major reason for lower efficiency and higher unburned hydrocarbon and carbon monoxide emission for two stroke engine is short circuit losses during the scavenging process. Determine the level of porting you wish to achieve before you start cutting or grinding. Edge chamfering and cylinder porting for twostroke engines.

The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. Tier 2 standards of the california air resource board carb went into effect in. The worlds leading 2stroke engine simulation software for 3. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2 stage or 3stage diffuser. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Cylinder porting, a related technique, is designed to improve flow characteristics and promote optimum engine. 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. This 2 stroke engine animation, article and diagrams are courtesty of. You should only rely on the experience of the very best. The high performance 2 stroke engine is a pulse resonance engine which means that the operation in general and the scavenging in particular is not only.

Stock engine parameters are entered on the top row of controls. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to design and are made for maximum durability hence the thickness of the walls. Porting and trenching two stroke engine cases runtime 25. In a two stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust or scavenging functions occurring at the same time.

Heres how shaving off miniscule ammounts of metal can drastically improve your speed. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. Harris performance engineering hp race development. A singlecylinder, loopscavenged, sparkignition, twostroke engine extensively used for. How to tips from tj on porting and polishing 2 strokes. Intake the fuelair mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston.

Contemporary twostroke technology was introduced initially to suzuki, and later to yamaha in japan when ernst degner defected from east germany to join suzuki. As far as emissions are concerned, the behavior of this two stroke engine does. Basic 2 stroke tuning by eric gorr changing the power band of your dirt. Bsa bantams only have three gears and thus the exhaust design had to give a wide power band. Two stroke engines often have a high powertoweight ratio, power being available in a narrow range of rotational speeds called the power. The 14sr kit is the 2 stroke porting kit for 100cc and under mx bikes, chainsaws, scooters, mini bikes, rc vehicles, dirtbikes, and all small displacement 2 strokes. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Airgasoline enters the engine from the carburetor at a ratio close to 15. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. You can print the image on transparancy film to use as a porting.

Dynomationtwostroke engine simulation motion software, inc. 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. 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. After all of this is done, you have successfully matched your engines ports. Test your own theories on porting and exhaust pipe design. Aussie twostroke engine invention motorbike writer. 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. Millions of fluid and thermodynamic calculations are made by mota representing the conditions inside your two stroke engine throughout its complete operating cycle.

However, you shouldnt just pick any business that you can find anywhere. The header interacts a lot with the exhaust port shape, so this angle is dependent on the exhaust port configuration. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Millennium technologies provides repair and maintenance services for cylinders and cylinder heads, and manufactures nickel silicon carbide plated cylinders for a variety of engines, including motorcycles, snowmobiles, race cars, karts, dirt bikes and watercraft. If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy. Softengine dynamometers and engine simulation software. Using our flow bench, dynomometer, and advanced computer simulation software along with hard work and testing, we offer industry leading performance. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. We believe that using this software will help your 2 stroke development or racing results on different types of competition. There are many ways to boost the power, one of which is by installing a tuned pipe. Part of the problem is understanding the pulse or charge nature of the airflow in a 2 stroke engine. The way a two stroke motor works causes them to be f.

Simple twostroke cylinder porting tutorial youtube. This is in contrast to a four stroke engine, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. Head machining to suit unleaded or race fuel to get a perfect burn from your engine. Our example has an after market 50cc performance cylinder with a bridged exhaust port. Although invisible to the machine 2 is more simple than 4 stroke engines, with very few components, only the piston within the cylinder, but actually not very complex machine 2 in the calculation. Hey guys, getting ready for a few saw builds, and am a bit new to the saw world not new to engine building ported many a 4 stroke, and some 2 stroke dirt bike, banshee, etc. A sydney engineering company has developed a new twostroke engine that they believe could be used in motorcycles. 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. Cfd modelling of a two stroke engine to predict and reduce. For port work, one company that will help you is 2strokeporting. It will simulate one of the cylinders of a multicylinder two stroke engine provided that the cylinders are identical in layout and dimensions and each cylinder has a seperate exhaust and induction system. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy.

By this i mean intake port to intake manifold, transfer ports to engine case, and exhaust port to exhaust header flange. Some smaller engines, however, notably those fitted to some mopeds or motorcycles, operate on a two stroke cycle the piston is on a power stroke every time it moves down the cylinder so the crankshaft turns only once during each cycle. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder two stroke engines. Crankcase and cylinder porting is probably the most controversial subject among performance 2 stroke engine builders. Does anyone have any recommendations for individuals or companies the will do porting on vintage 2 stroke engines. You can choose to have the program calculate either required port height adjustments, or port durations. For our design example we are going to design an exhaust system for a 50cc minarelli am6 engine. Really cool two stroke cylinder porting software youtube. We also have a simple 2 stroke expansion chamber design program.

Performance porting of vintage 2strokes vintage dirt bikes. I made this video long ago, but forgot to upload it. 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. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. 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. Cc specialty tools will always be the company to go to for all your porting and polishing tools and equipment. 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 motocross its usually a compromise between best peak hp and good early off the pipe power. A few cars have used this engine too, such as the wartburg knight and some early saabs. These modifications can be extremely effective when used in the right combinations. Looking to find an experienced and reliable person to upgrade the performance of my honda mr175. We have the optimum case modifications to suit each application and engine developed over countless hours.

Position the red slide switch, located to the left of the displays, in line with. Since the two stroke engine fires on every revolution of the crankshaft, a two stroke engine is usually more powerful than a four stroke engine of equivalent size. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. I only have a dremel and was wondering if i could do anything at all myself to my yz125 before i put it together. Port matching, porting and trenching twostroke engine cases. Its called crankcase independent twostroke cits and was invented by former south african motorsport engineer basil van rooyen, director of cits engineering, st ives. Moreover, interest factors like the port parameters are computed even if the.

The main use of motion dynamics in a gas engine to generate power. Twostroke waveaction engine simulation motion software. This, coupled with their lighter, simpler construction, makes the two stroke engine popular in chainsaws, line trimmers, outboard motors, snowmobiles, jetskis, light motorcycles. Bigger carburetors, higher compression ratios, altered port timings and expansion. What you have accomplished up to this point will definitely allow your engine to run smoother, stronger, and more efficient. Low exhaust emission system for small twostroke cycle. I see a lot of people asking questions about porting feel free to add to this thread all you fellow modders first things first here you got to understand how 2 stroke engines operate just because you know the basics dont mean nothing here is a. A singlecylinder, loopscavenged, sparkignition, two stroke engine extensively used for. Sep 30, 2012 hi performance two stroke porting software program. 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. Four stroke porting and performance finding reliable, quality power you can feel on modern four strokes is very challenging. Two stroke cylinder porting tips watch this before you start cutting. A two stroke or twocycle engine is a type of internal combustion engine which completes a power cycle with two strokes up and down movements of the piston during only one crankshaft revolution.

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. The trend in high performance two strokes has continued towards more case volume, however each engine and application differ. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. They are so simple and fun that ive always enjoyed tinkering with them. Below the stock engine parameters are displays for input and output of porting information. These are the engines used in cl stunt where we swing large props at quite low revs, usually around 8000 and in a 4 stroke mode. By combining designs which degner brought from mz with japanese technology in. Advances in the design of twostroke, high speed, compression. Assign fixed relationships between transfers and exhaust port. Ted boyko began porting cylinders 45 years ago, when the twostroke craze was at its peak, and hes still at it today. Two stroke engine porting zmod this software made for help out team in first time, but some friend advise this is the time to share. Computer design software is used to calculate the msv for head. Purchase the porting tools you need at our online store.

Test engines with pistonport induction, reedvalve induction, or rotaryvalve induction. 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 use computer design software to maximize power and torque at any elevation. 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. Jul 18, 2017 porting and polishing two stroke motorcycle engines. Calculates port heights from durations, or durations from port heights. Mspec twostroke performance services millennium tech. After entering the stroke and rod length, select either field to calculate. If you are aiming for these qualities, modifying your 2stroke engine is. Port matching, porting and trenching twostroke engine cases duration. No previous knowledge of the two stroke cycle engine is required just input the required data and then run mota to set in motion this powerful process. Effect of ports configuration on trapping efficiency of a twostroke. Port timing basics airgasoline enters the engine from the carburetor at a ratio close to 15. The two stroke engine employs both the crankcase and the cylinder to achieve all the elements of the otto cycle in only two strokes of the piston.

A dremel is for wood working or engraving your favorite paper weight, but not for porting and polishing on a 2 stroke. Low exhaust emission system for small two stroke cycle engines yoshio kobayashi 1 kazuyuki uenoyama yukiteru yoshida1 kazunori kudo 2 hiroyuki endo3 emission regulations for small utility, lawn, and garden equipment engines went into effect in 1995 in the u. Hi performance two stroke porting software program youtube. Have the specifications for the porting in hand just need an expert to do the job. It clearly shows the air fuel mixture as a green mist while entering the engine through the intake track. The result was 25hp at the rear wheel with the engine coming on the pipe at 7000 revsmin and producing usefull power to 1 revsmin using the original cast iron 125cc. This water cooled, reed induction engine is used in a variety of 50cc production road bikes such as the aprilia rs50, yamaha tzr 50 and the rieju. Sometimes an engine can benefit from a nondivergent header, especially if the port is relative large or not state of the art. Engine geometry is modeled using commercial proe software.