2 cycle porting software

Would seem that adapting a flow bench to the engine for testing would be the way to go. Cylinder heads are made for porting, the more fuel and air you can get in, and the faster you can do it, the faster you will go. 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. Bottom of inlet port location entering a value will produce inlet timing figures. 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. The morbidelli 125 twin road racer is a rotary valve engine. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. Determine what port is required for a specific rpm and compression. 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. 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. Best cylinder porting, engine porting, 2stroke porting, 4.

An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. A twostroke or two cycle 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. The kit lets you adjust the carburetor handy and keep the engine in good condition. You dont need fancy expensive stuff to port two stroke cylinders, you can get by with cheap tools and a little creative engineering.

Two cycle engine port timing calculator csgnetwork. The piston crown opens and closes the exhaust and transfer ports. For a piston port intake there needs to be around 120 degrees of port open duration for a peak rpm around 6000. 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. Engineering acousticssonic supercharging of 2 stroke. Marked with tool type on the handle, easy to recognize. I bought the laptop not more than four weeks ago and to this point havent been doing anything but. Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. Test your own theories on porting and exhaust pipe design. Bimotion 2 stroke software has been commercially available and in professional use since 1991. Australian dollars including gst and delivery within australia or exported to most countries. Thought number 2 with a 4 stroke its all about flow port it to increase flow. I have over 38 years experience working with some of the best 2 stroke engineers in the world. You can print the image on transparancy film to use as a porting guide.

Two stroke cylinder porting tips watch this before you. Unlocking the secrets of 2 stroke porting, part 2 how to trace and. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. Does anyone have any recommendations for individuals or companies the will do porting on vintage 2 stroke engines. 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. Bigger carburetors, higher compression ratios, altered port timings and expansion. The measurement required is the vertical distance from the crankshaft axis to the bottom edge of the inlet port. Dynomationtwostroke engine simulation motion software, inc. Port matching, porting and trenching twostroke engine cases.

With 2 stroke engine modification, porting and polishing is the ultimate choice. Compare your gas cap andor oil port with the images below. Calculates port heights from durations, or durations from port heights. Main reason for wanting the software is to play with the port timing. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. Scavenging ports optimal design of a twostroke small. We use computer design software to maximize power and torque at any elevation. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. Porting and polishing kits for 2 stroke and 4 stroke motors.

Professional grade 2 stroke porting and polishing kit includes. This is a pretty good discussion from a long time customer, eric gore at forward motion. For a reed valve intake there needs to be holes in the piston that allows passage of fuel mixture from the carb. For introductory material on 2 stroke engines please see the following links. No previous knowledge of the twostroke cycle engine is required just input the required data and then run mota to set in motion this powerful process. The computer allows us to compare the variables with existing. Flow has to be a consideration if you can increase flow with the same timing you should increase output.

The gas will move upward toward the rear cylinder and spins continue rinsing residual combustion gases from the power stroke. Usb power cycling automatically microsoft community. 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. For a 2 stroke engine the tuned pipe is the section of the exhaust system that begins at the exhaust port and ends at. Each part of the 2stroke cycle can be evaluated and designed with computer software programs. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine. This first link will discuss terms and the 2 stroke cycle. This is in contrast to a fourstroke engine, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. The easiest way to determine if your small engine is a 2 cycle or 4 cycle is the number and type of fill ports where you add either oil or gas on the engine. Each time the exhaust port of a 2 stroke cylinder is uncovered, exhaust gases.

Properly tuned systems can increase the charge of fuel delivered to the cylinders and a related phenomenon can aid. It requires values for stroke, piston height, conrod length, and wrist pin offset. The term is also used when software hardware is changed to make them usable. Subsequently, the meshing process is implemented using avl fire software. 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. In software engineering, porting is the process of adapting software for the purpose of achieving some form of execution in a computing environment that is different from the one that a given program meant for such execution was originally designed for e.

Rk tek uses the latest in 2 stroke design and simulation software, coupled with, practical knowledge that can only be gained through experience and trial and error, to properly modify any engine. Exhaust and intake tuning this article describes the principles involved in using tuned exhaust and intake systems on two cycle and four cycle engines. Keep in mind measurement designations can be metric or us. The computer allows us to compare the variables with existing engines. Exhaust and intake tuning building, tips and techniques. 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. The higher resolutions will give finer port outlines, but you must have photo software that will allow you to print in actual size. Tips on how to port a two stroke cylinder, what to donot do and how to do it right. In the design form first select the water cooled and reed induction options from the dropdown menus. Cc specialty tools porting and polishing for 2 stroke engines.

Upgraded 10 different screwdriver heads used for most 2 cycle small carburetor engines, can save your time and make your work easier to complete. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. The window on the intake side is usually there to keep the piston from closing off the intake where the port is high enough up the cylinder for that to be possible. Efficiency, velocity, trajectory all play a role, and there is no way to get this right without the proper porting. Dynomationtwostroke engine simulation motion software. If the engine has a single fill port for both the small engine oil and gas, you have a 2cycle. My porting setup affordable and functional 2 stroke tuning. Looking to find an experienced and reliable person to upgrade the performance of my honda mr175. Everything you need to know about the twostroke cylinder. Two stroke cylinder porting tips watch this before you start cutting. These two links are a great guide, and will help you and your understanding of porting and polishing.

The next link will go over some basic principles behind the goal of porting and polishing. 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. An explanation of the how the transfer ports on a 2 stroke cylinder work, along with tips for porting 2 stroke transfer ports. Ive tried just about every combination inside and outside the box when it comes to porting 2 strokes and i must say there is a little black magic to it. One field must have a value to calculate the other. Performance porting of vintage 2strokes vintage dirt. Assign fixed relationships between transfers and exhaust port. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Computer design each part of the 2stroke cycle can be evaluated and designed with computer software programs. Boost port windows are in fact sometimes added on the back side of the piston, and in some reed valve engines, the rear transfer actually intersects the intake port directly. That is fresh out of the ported gas transfer and fused to form a cycle. The ports found within a twostroke cylinder in combination with the.