2 stroke port design software

While the head is off to check the squish then you can impress the ports on a piece of paper pressing the paper along the. I have heard trs software is similar, but gp blairs is cheaper plus it comes with a book explaining all of the engineering behind it. This coefficient kh is called the horn coefficient, with typical values between one and two. Subsequently, the meshing process is implemented using avl fire software. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy. Each intake port can be locked to a fixed timing relation with the exhaust port. Each time the piston uncovers the exhaust port which is cut into the side of the cylinder in twostrokes, the pulse of exhaust gases rushing out the port creates a positive pressure wave which radiates from the exhaust port. A 2stroke is different of course since there is only a finite amount of fresh mixture available in the crankcase to be transferred up into the cylinder. What is the use of transfer ports in a twostroke engine. An engines exhaust port can be thought of as a sound generator. Our 1mc, the worlds best know right angle porting tool. Bimotion 2stroke software has been commercially available and in professional use since 1991.

Bigger carburetors, higher compression ratios, altered port timings and expansion. How twostroke expansion chambers work, and why you should. Mota software, 2 stroke engine simulation software, 2 stroke exhaust design. Dynomation5 has a builtin menu library of nearly shortblocks. Aussie twostroke engine invention motorbike writer. The exhaust designer programme enables the user to design a twostroke exhaust system with ease, then with one click of the mouse, create a pdf document in any of the common paper sizes a4, a3, letter. How exhaust port timing affects two stroke performance.

How not to short circuit the ports through the piston pin area. We also have a simple 2stroke expansion chamber design program. This does not ruin high rpm power because anything other. How to loop the tranfer roofs so the charge doesnt go straight out the exhaust.

Torqsoft twostroke exhaust system designer programme. Each time the exhaust port of a 2stroke cylinder is uncovered, exhaust gases rush. 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. We are known to use huge amounts of epoxy to redesign transfer tunnels to make power where the. 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. 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. Really cool two stroke cylinder porting software diospeeddemon. Software for fine tuning and design of two stroke engine. Computer design each part of the 2 stroke cycle can be evaluated and designed with computer software programs. We use computer design software to maximize power and torque at any elevation. Simulation of engines with either a boxsilencer or an expansion chamber is also possible. 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. Bmep hp x 6500 l x rpm 2 stroke l engine size in liters.

Each part of the 2stroke cycle can be evaluated and designed with computer software programs. 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. The computer allows us to compare the variables with existing engines. For introductory material on 2 stroke engines please see the following links. That approach is a completely waist since port area dont give any information about port shape. Is your exhaust port big enough for the pipes at a specific rpm. The exhaust port received no area change other than the little bit it gained from raising the barrel a total. The worlds leading 2stroke engine simulation software for 3. A simple 3 stage two stroke exhaust calculator based on formulas of g. We cant afford to waste any of it by having it escape out the exhaust port.

I will be rating the product in the following areas, in an effort to spread the word about 2 stroke engine design software. The increase in transfer port timing created well over mm2 of additional port area. Many had crankcases that were not part of the induction system and they had intake vales but the exhaust was a port in the cylinder wall, most required a blower to run. Two stroke design modification software the following are spreadsheets for different aspects of 2 stroke design modification. Purchase with immediate download from digital river, shareit. It reveals otherwise invisible pressure waves and mass flow in cylinders and engine passages.

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. Many people talk about a port area as a target value and indirect refers to a header area with an area factor for the port. If you want to understand how the 2 stroke engine actually works this is the book to read, thoroughly explained,and gives you the chance to actually understand how to work things out with the formulas. Engineering acousticssonic supercharging of 2 stroke. Determine what port is required for a specific rpm and compression. Tab down to the exhaust port box and enter 39 for diameter and 79 for length. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine. This will get you started by providing, for your engine, the dimensions of an expansion chamber with a 2stage or 3stage diffuser. Bimotion 2 stroke software has been commercially available and in professional use since 1991. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no.

Dynomation5 engine simulation motion software, inc. I use the tsr computer software to calculatepredict the horsepower. A shallow bowl was included in the centre of piston top to guide the fuel jets from injector and also avoid the interference with the spark plug. How to shape the port bevels so the ring acts right going over it.

It allows simulation of engines with reedvalve, rotaryvalve and piston port. Port design criteria for 2stroke loop scavenged engines. Two stroke engine and exhaust design software post by oldjohnno. Since modifying the 2stroke engines require not only a big. I will show the final output parameters of the test engine from each software program and include my thoughts and comments about it. Using twostroke design software to guide me through this i have decided on porting numbers which will give me the power characteristics i want.

The design types vary according to the method of introducing the charge to the cylinder, the method of scavenging the cylinder exchanging burnt exhaust for fresh mixture and the method of exhausting the cylinder. Scavenging ports optimal design of a twostroke small. Small values of kh are best suited to grand prix engines with narrow power bands, larger. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at. Two stroke designmodification software the following are spreadsheets for different aspects of 2 stroke designmodification. Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines. Based on the initial design of borestroke for maximum performance, 28 a pent roof cylinder head was incorporated in the busdig engine to accommodate two exhaust valves, a central mounted direct injection gasoline injector and spark plug. Therefore, new criteria are necessary to address the scavenging system design of the new generation of 2stroke automobileaircraft engines. Port matching, porting and trenching twostroke engine cases. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. However, by raising the centre of the port, the ring has less chance of hanging up on the edge of the port and breaking because the ends of the port actually begin pushing the ring back into the piston groove before the port closes. You can also save and load the data by using the provided functions. Really cool two stroke cylinder porting software youtube.

Two stroke engine and exhaust design software north. Moreover you can have advices for the development of the engine thanks to the help of tested formulas for intake, exhaust, blowdown and transfer. It allows simulation of engines with reedvalve, rotaryvalve and piston port timed induction systems. Then modify or design a tuned pipe to match the engine. 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.

The software uses mathematical formulas that are approximations of reality, and the. Analysis of scavenge port designs and exhaust valve. 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. We now have a simple 2 stroke expansion chamber design program. Piston port is the simplest of the designs and the most common in small twostroke engines. Not all porting is the same even the word porting has been mis used over the years. Computer design each part of the 2stroke cycle can be evaluated and designed with computer software programs. Softengine engine simulation software 2tbase seven software. Time area is still the standard unit for 2stroke ports since at least 1971. Scavenging system redesign is more accurate, and doing so can entail complete overhauls of cylinder designs. Some 2 stroke porting enhancements you can make to make airflow better in your engine with simple tools. 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. In a 2stroke, we want to maximize the retention of that finite fuel charge.