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. You should read about how the two stroke enigne works before you attempt this. 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. The idea is to get an education in cause and effect. Changing the power of 2stroke engine is really very simple when you know the basic techniques of 2stroke engines. Hi performance two stroke porting software program youtube. Bigger carburetors, higher compression ratios, altered port timings and expansion. 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. 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 port opening to the cylinder. At this point, we decided to find a better suited piston that was equipped with 2 rings vs.
Perfect porting kit for small 2 stroke cylinder s 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. How to tips from tj on porting and polishing 2 strokes. Since the steam client isnt much without a game, were also porting l4d2 to ubuntu. You dont need fancy expensive stuff to port two stroke cylinders, you can get by with cheap tools and a little creative engineering. The level c head is fully cnc machined including the combustion chamber which offers unmatched consistency and. Part 21 cylinder head porting terms and tools 620 hp 454 big block chevy. If you are aiming for these qualities, modifying your 2stroke engine is.
Oct 04, 2011 changing the power of 2 stroke engine is really very simple when you know the basic techniques of 2 stroke engines. The software in question the inexpensive stuff is great for someone who just does not have the math skills to wade through what seem to be a text book of complex formulas. For red hat enterprise linux 6 please see the attached pdf file. There is no 2 stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 single cylinder and our modules will work flawlessly. In the design form first select the water cooled and reed induction options from the dropdown menus. Apr, 2015 has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. But because of the limited worldwide activity in twostroke engine development, program sales were limited and further development was curtailed. Webkit is a browser engine developed by apple and primarily used in its.
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 in concert with intakecombustionexhaust quality purpose built pipe is critical. Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder twostroke engines. Webkit supports macos, windows, linux, and various other unixlike. Port heights port durations required ranges of port mean areas possible ring flutter rpm mean piston speed suggests carburettor size power meter you input expected bmep value adjust port shapes for target areas in cad window. The trend in high performance two strokes has continued towards more case volume, however each engine and application differ. 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. Bottom of inlet port location entering a value will produce inlet timing figures.
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. The old adage of stuffing cases on every project just isnt true any more. Use this mode if you would like to see the effect of crank size, or rod length changes on the port durations. Cylinder porting tools artco american rotary tools company. Also, ogre was ported to ps3 and xbox360 for several titles. Free 2 stroke expansion chamber calculator software update. Cylinder porting, a related technique, is designed to improve flow characteristics and. 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. Really cool two stroke cylinder porting software youtube. We use porting tools that work, and with such a vast experience in this very delicate and demanding area we can usually provide a job that is the equal of anything from across the globe. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. 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. It requires values for stroke, piston height, conrod length, and. Two stroke cylinder porting tips watch this before you start cutting.
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. 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. 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. 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. What is the use of transfer ports in a twostroke 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. This cylinder has two exhaust ports and five transfer ports so enter 2 in the no. 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. The luks version 2 luks2 format replaces the legacy luks luks1 format. You will have to figure out all of this information. Edge chamfering and cylinder porting for twostroke engines.
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. Careful care must be taken to assure that engine will not end up making less power then it did before the engine porting was done. In fact, and some of you arent going to believe this it is possible to. When set to calculate duration fig 2, you enter the port height adjustments. Ogre supports windows all major versions, linux, osx, android, ios. Software is portable when the cost of porting it to a new platform is significantly. After entering the stroke and rod length, select either field to calculate. Doing the finishing touches on the spx cylinder and wanted to give you a quick tour of my porting setup.
If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy. I should also mention that my bike is an 07 yz250 with v. Specialty tools for porting 2 stroke, 4 stroke, cylinders, cylinder heads, 2 stroke case porting, and intakes. Our many years of 2 stroke engine tuning includes our never ending work in performance cylinder modifications. Mount an old piston to the table of a drillpress and using a carbide cutting bit, you can shave off some of the bridge port just be sure to knife the. 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. I have over 38 years experience working with some of the best 2 stroke engineers in the world. You should only rely on the experience of the very best.
Mota and its related set of programs have been developed to simulate the performance of highoutput single cylinder two stroke engines. The initial release supported only linux and mac os x. You have to know a lot of things about your engine port size and location, port timing, desired application, etc. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. One field must have a value to calculate the other. Use mdy dates from octobe see also free and opensource software portal.
Edge chamfering and cylinder porting for two stroke engines edge chamfering is a surface finishing technique that smoothes the edges of cylinder ports so that piston rings seat properly. 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. I bet after gabe release steam and port source engine to linux, that ubuntu. Assign fixed relationships between transfers and exhaust port.
Two cycle engine port timing calculator csgnetwork. 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. Cylinder porting, a related technique, is designed to improve flow characteristics and promote optimum engine performance. The businesses and individuals that purchased the original dynomation 2 stroke program were pleased with the capability and accuracy of the software. Selected yum plugins and utilities have been ported to the new dnf back end. Always measure the cylinder you are working on to see if it has been previously modified. Simple twostroke cylinder porting tutorial youtube. Our example has an after market 50cc performance cylinder with a bridged exhaust port. Determine the level of porting you wish to achieve before you start cutting or grinding. You dont need fancy expensive stuff to port two stroke cylinders, you can get by with. Transfer is sometimes called bypass as this port enables the fresh fuelair mix to pass by the piston and enter the upper cylinder. Jul 18, 2017 porting and polishing two stroke motorcycle engines. For port work, one company that will help you is 2strokeporting. If you are aiming for these qualities, modifying your 2stroke engine is a great strategy.
However, you shouldnt just pick any business that you can find anywhere. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. Porting tool ah9018332pt works great on most 100cc engines and larger. Lowell horning 2 stroke porting 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 in concert with intakecombustionexhaust quality purpose built pipe is critical. 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. That is measured from the gasket surface at the top of the cylinder down to the peak of the exhaust port. This kit is our now, famous, drop in piston and head kit over 5,000 sold where, not only, did we fit the engine with 2 ring pistons, we also gave the engine a very nice porting change via the piston geometry. Calculates port heights from durations, or durations from port heights. Head machining to suit unleaded or race fuel to get a perfect burn from your engine. I should also mention that my bike is an 07 yz250 with vforce 3 reeds, fmf fatty and powercore 2. A stock rd350 according to the factory manual has an exhaust port height of 29. Part of the problem is understanding the pulse or charge nature of the airflow in a 2 stroke engine. Ogre open source 3d graphics engine home of a marvelous.
Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. Artco tools carries a great selection of cylinder porting tools including porting tools, porting abrasives, carbide burs, and more. Has any one done any kind of porting or polishing to a 2 stroke cylinder themselves. Hi high performance 2 two stroke porting, port timing.
Just a quick update on the progress of the freeware 2 stroke expansion chamber calculator software. This handpiece extends telescopically, adding an extra 3. 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. This handpiece extends telescopically, adding an extra 3 1 2 to the overall tool length. Port matching, porting and trenching twostroke engine cases. 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. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. My porting setup affordable and functional 2 stroke tuning. Best cylinder porting, engine porting, 2stroke porting, 4. Airgasoline enters the engine from the carburetor at a ratio close to 15. May 07, 2018 i made this video long ago, but forgot to upload 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. Perfect porting kit for small 2 stroke cylinder s the 14sr kit is the 2 stroke porting kit for 100cc and under mx bikes, chainsaws, scooters, mini bikes, rc vehicles, dirtbikes, and.
Unlocking the secrets of 2 stroke porting, part 2 how to trace and measure. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. 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. 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. Edge chamfering and cylinder porting for twostroke engines edge chamfering is a surface finishing technique that smoothes the edges of cylinder ports so that piston rings seat properly. 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.
The program calculates the new durations based on the port height adjustments, stock cylinder specs, and barrel height. Heres how shaving off miniscule ammounts of metal can drastically improve your speed. Purchase the porting tools you need at our online store. Information regarding the red hat enterprise linux life cycle is provided in the red. 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. After successfully porting l4d2 to ubuntu, interest grew within valve and.
This is great because it will finally break the cycle of. Relation of port timing to peak rpm, and port timing for a specific 48cc cylinder, this doesnt. Crankcase and cylinder porting is probably the most controversial subject among performance 2 stroke engine builders. Twostroke waveaction engine simulation motion software. In motocross its usually a compromise between best peak hp and good early off the pipe power.
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