The timing of the transfer and exhaust ports is a key factor controlling the performance characteristics of a two stroke engine. A singlecylinder, loopscavenged, sparkignition, twostroke engine extensively used for twowheeler. Racingsm software for 2stroke development, also for 4strokes in some modules, create 2t exhaust, create 2stroke exhaust. Lets hope there is a plated dualsport bike coming soon to a dealer near you. Two stroke engine and exhaust design software north. With the traditional lubrication technique of mixing oil into the fuel, they also have the advantage of working in any orientation, as there is no oil reservoir dependent on gravity. Determine what port is required for a specific rpm and compression. Aug 25, 2017 will ktms clean twostroke make it to the street. It requires values for stroke, piston height, conrod length, and wrist pin offset.
In twostroke engine technology a port map is a diagram which shows the ports that are cut into the cylinder of an engine a port map can be useful to determine openingclosingtiming and the area of specific ports. The exhaust port opens and combustion gas starts down the pipe at supersonic speeds. 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. What is the use of transfer ports in a twostroke engine. A taller port restored lost power but made the power band unacceptably narrow.
Blair of queens university belfast, and published by the society of automotive engineers. Software for fine tuning and design of two stroke engine by. There are exhaust manufacturers now that are mating up tuned pipes to tuned ported engines to get the best possible supercharging effect at given. The piston crown opens and closes the exhaust and transfer ports. Contents chapter 1 introduction 9 chapter 2 the cylinder. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. Calculates port heights from durations, or durations from port heights.
Added methods for obtaining spanning tree protocol data from dell n series switches and two flavors of netgear switches that do not report. The information used in the programs calculations was taken from the books the basic design of the two stroke engine and the book design and simulation of two stroke engines. Software program for porting and portmapping, single cylinder, twostroke motorcycle cylinders. The exhaust was timed to open 74 before bdc and close 74 after b dc for an open duration of 148 and the transfer and boost ports timed to open 64.
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. 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. Purchase with immediate download from digital river, shareit. A twostroke, 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. Each part of the 2stroke cycle can be evaluated and designed with computer software programs. A mild woods port shifted the power band to higher rpms cuts a little faster as long as you keep the revs up, but not as forgiving if you lean on it. Really cool two stroke cylinder porting software youtube. Each intake port can be locked to a fixed timing relation with the exhaust port. The measurement required is the vertical distance from the crankshaft axis to the bottom edge of the inlet port. Two stroke performance tuning a disc partially cut away and attached to the end of the crankshaft opens and closes an inlet port in the side of the crankcase. Cutting the sleeve at the base of main transfer ports for just a little more airflow. When measuring the ports keep in mind the width of any bevel which might be on the port. The next thing to do is to measure the area of the ports. 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.
Two stroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. Port timing basics airgasoline enters the engine from the carburetor at a ratio close to 15. Softengine engine simulation software 2tbase seven software. Bottom of inlet port location entering a value will produce inlet timing figures. There are a multitude of designs and endless combinations that can be made to work well. Relation of port timing to peak rpm, and port timing for a specific 48cc cylinder, this doesnt. In the case of two stroke cycle engines the inlet and exhaust valves are not present.
The computer allows us to compare the variables with existing engines. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. These diagrams are usually represented as a rolled out cylinder where the width equals the circumference and the height equals the stroke plus the cylinder skirt, the ports are. 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. 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. Two stroke engine and exhaust design software post by gerrit sun jan 17, 2016 10. Sep 30, 2012 e30 engmod2t best two stroke software. Nov 02, 2019 the operation of a two stroke engine equipped with a properly tuned pipe is shown in the animation below, for a step by step description of the process, please follow the link below the animation. Software program for porting and port mapping, single cylinder, two stroke mo. Two stroke performance tuning back in europe twostroke engineers were battling excessive ring and cylinder wear, due to the exhaust port width being too great.
Oct 04, 2011 changing the power of 2 stroke engine is really very simple when you know the basic techniques of 2 stroke engines. Even the most advanced porting software needs information like this to make accurate predictions. In the design form first select the water cooled and reed induction options from the dropdown menus. The inlet port opens 30 after bdc and closes 79 after tdc. 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. Macdizzys two stroke technology exchange is the two stroke engine capital of the internet. In two stroke engine technology a port map is a diagram which shows the ports that are cut into the cylinder of an engine a port map can be useful to determine openingclosingtiming and the area of specific ports. Jun 24, 2007 the sleeve utilizes conventional schnuerle plus boost port scavenging with a single transfer port on either side of the divided exhaust port and a single boost port directly opposite the exhaust. Assign fixed relationships between transfers and exhaust port. By using the torqsoft exhaust timearea programme, it was possible to raise the power output of the engine by 10% just by a simple modification to the exhaust port. Engineering acousticssonic supercharging of 2 stroke engines. Transfers opened up, a real boost port, and a much improved intake. One way to map out the ports of a 2 stroke cylinder.
In order to optimize an engine and to find initial settings for a tuned pipe exhaust system, on must determine the timing of the engine. Transfer port fuel injection cleans up the dirty twostroke. For manufacter and tuner of two stroke engine, ntproject has developed a series of software to help in the development of the engine and its components from the bellmouth of the carburetor, to the insert of the reed valve and the reed petals, at the studied of the cylinder ports, until to the balance of the crankshaft, thanks at our software you could optimize your engine and to develop new. 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.
You can add extra ports to the portmap image eg using mspaint, load the new image and trace the new ports. Motas twostroke dyno will give you and your pc the equivalent of many experts knowledge. Jan 28, 2020 whats new in managed switch port mapping tool 2. Unlocking the secrets of 2 stroke porting part 1 why do you map. How to make portmaps, find port duration, port corner radius, port flow width, and port height, heres a great tool for converting piston travel in mm to degrees of crankshaft rotation. Engine geometry is modeled using commercial proe software. Our heads cool the piston better, prevent detonation, and. 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. Mechanically plugging an exhaust bleed port with 14 aluminum rod before welding for racing.
But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. How exhaust port timing affects two stroke performance. Here we are tuning a yz80 motocross engine for use in a motorcycle road racer. Scavenging ports optimal design of a twostroke small.
Jan 19, 2008 he will do one of two things,hang up, or if he is a good one,start explaining the complex nature of fluid dynamics, sonic wave pressures and the effects temperature on the speed and timing it takes to hit an open exhaust port at 6500 rpmsthis being said. Map network drive function from the tools menu in windows explorer to link the. Two stroke designmodification software the following are spreadsheets for different aspects of 2 stroke designmodification. Apr 19, 2019 the upnp portmapper can be used to easily manage the port mappings port forwarding of a upnp enabled internet gatewayrouter in the local network. The angle area graph has buttons to optionally turn these extra ports on and off, so you can quickly make a comparison of their effect without loading a new portmap.
Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer. Software for fine tuning and design of two stroke engine. The morbidelli 125 twin road racer is a rotary valve engine. Will ktms clean twostroke engine make it to the street. The computer allows us to compare the variables with existing. We test tirelessly to provide a head arrangement with the proper squish band width, clearance, bowl shape and volume to suit each individual combination. The time area distribution is simply different over the port height because the port is open different periods of time during the stroke. Effect of ports configuration on trapping efficiency of a twostroke. Our 1mc, the worlds best know right angle porting tool. Hi performance two stroke porting software program youtube. I feel i am lucky to find it in such an easy to use.
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