4 stroke engine porting software

The newest info i have is the two stroke tuners handbook by gordon jennings. The way i see it correct me if i am wrong the 4 stroke wouldnt loose bottom end by porting alone until you change cam profile and timing to which need to do to get the most out of your porting and to achive 170 hp which would then ruin driveability. Unlike on a twostroke, fourstroke porting is done in the head. With my porting, head modifications, and pipe i am able to make 110. We use computer design software to maximize power and torque at any elevation. I have over 38 years experience working with some of the best 2 stroke engineers in the world. Are other modifications necessary to get the enhancement from the porting. But because of the limited worldwide activity in two stroke engine development, program sales were limited and further development was curtailed. We specialize in optimizing flow characteristics of your 4 stroke head. 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. Engine performance simulation software has become an integral part of the engine designers toolkit. Doing the finishing touches on the spx cylinder and wanted to give you a quick tour of my porting setup. Everything you need to know about the twostroke cylinder.

Build 2 stroke exhausts, know how to change gear ratios depending on racetrack, simulate realworld performance with our bike dynamics simulator. Two stroke cylinder porting tips watch this before you start cutting. We believe that using this software will help your 2 stroke development or racing results on different types of competition. In other words, the engine will, after tuning, produce more power from the same displacement. The ttr230 is aircooled does the porting increase the likelihood of overheatingseizure. Calculates port heights from durations, or durations from port heights. Two stroke engine porting zmod for android apk download. If you are looking for a cam for your machine, we can find you one to go with our porting. The cutaway of the cylinder shown details the port arrangement and.

Im working on gathering enough parts to build a triple cylinder rd400 and at some point ill need to sort out the porting and exhaust. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2 stroke engine. While two stroke engine development is on the rise again, the worldwide interest in a professional two stroke engine simulation is still limited. Mar 27, 2010 i have just got my son an old 1985 xr 250. Cylinder heads, as manufactured, are usually suboptimal for racing. Our cnc ported head services are perfect additions to our bigbore kits.

Crankcase and cylinder porting is probably the most controversial subject among performance 2stroke engine builders. Heres how shaving off miniscule ammounts of metal can drastically improve your speed. 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. Best cylinder porting, engine porting, 2stroke porting, 4. 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. Twostroke waveaction engine simulation motion software, inc. 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. A four stroke also fourcycle engine is an internal combustion ic engine in which the piston completes four separate strokes while turning the crankshaft. To properly port the head on a fourstroke requires an understanding of. Softengine engine simulation software 2tbase seven software.

Porting goes hand and hand with high performance camshafts. The first 3 videos will cover simple mapping of the. Jul 28, 2006 what exactly is done when porting a 4 stroke same as a 2 stroke. The other is how air density barometric pressure, temp, humidity, and elevation change, affects horsepower. For road, youll be best off with a 4 21 system on a four cylinder engine. There are no ports in the cylinder wall of a fourstroke. While twostroke engine development is on the rise again, the worldwide. This is the third of a series of videos on the topic of 2 stroke engine ports. In order to obtain maximum results matching the carbs. If you keep your compression high and do not go crazy on your exhaust timing, you can get plenty of torque out of a chainsaw engine for its displacement. Subsequently, the meshing process is implemented using avl fire software.

It is very important to understand that tuning a single item fitting bigger. Simple twostroke cylinder porting tutorial youtube. 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. Racingsm software has some specific modules that can help tunersbuilders on their race engines bikes in order to improve performance and reduce lap times. In contrast, a two stroke engine s valve timing may be altered simply by reshaping the holes in its cylinders, and its power output markedly changed by utilizing inertia and resonant effects in its intake and exhaust tracts. Diy moto fix website rebuild your dirt bike engine. On the other hand, while the two stroke engine does not commonly require large. Kinda like f3 porting on a full mod 94 zr 700 that couldnt catch a 95 efi zr580 on ufa purple.

This is the third of a series of videos on the topic of 2 stroke engine ports that you need to know if you are intending to modify your engine. 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 gas flow through the engine. Blair of queens university belfast, and published by the society of automotive engineers. Mar 16, 2012 to stroke an engine, a tuner relocates the bigend bearing further outboard on the crank halves. The combination of cnc and cam software give the porter full control over the port shape and. We believe that using this software will help your 2stroke development or racing results on different types of competition. The description of 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. Unless you have a deep passion for two stroke tuning, are willing to spend money on software and porting equipment, and are comfortable throwing away botched cylinders, i would recommend having a reputable professional carry out any desired port modifications. Part of the problem is understanding the pulse or charge nature of the airflow in a 2stroke engine. Each intake port can be locked to a fixed timing relation with the exhaust port. You should read about how the two stroke enigne works before you attempt this.

An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. North american two strokes general two stroke discussion two stroke engine and exhaust design software this is the place to talk about anything related to two stroke road race bikes. The objective of tuning is to improve the volumetric efficiency of the engine. Port matching, porting and trenching two stroke engine cases duration. The twostroke engine is a common power source for small and. Cc specialty tools will always be the company to go to for all your porting and polishing tools and equipment.

Porting and polishing two stroke motorcycle engines. For example, a cc engine may produce 125 hp in stock form and 175 hp after race tuning. These bikes has been known to punch out big hp with twin carbs and exhaust. If you are aiming for these qualities, modifying your 2 stroke engine is a great strategy. Porting 4stroke cnc head porting through our partnerships with the best builders in the country, we are able to provide fully developed cnc ported cylinder head services to our retail and dealer customers. Cylinder head porting can make dramatic results on your 4 stroke machine. Head porting and valve seat service tbt racing engine modifications improve lowend, topend and just make the bike pull harder from idle to the rev limiter. We know more power is good, but creating rideable, reliable horsepower that you can make the most of is the key to faster lap times. Feb 16, 2017 two stroke cylinder porting tips watch this before you start cutting.

Moreover, interest factors like the port parameters are computed even if the. Many things will affect the power delivery of two stroke motorcycle engines. The 4 21 system gives good allround power, with no special power peaks or dips, while a 4 1 system give the best power at higher revs at the expense of low end power. Those of us who have grown up in the japanese two stroke. Unlocking the secrets of 2 stroke porting, part 2 how to trace and measure ports. Assign fixed relationships between transfers and exhaust port. Merakit mesin rx king full porting harian duration. However, optimization of a particular design using such. Two stroke engine and exhaust design software north. 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. For port work, one company that will help you is 2 strokeporting. The worlds leading 2stroke engine simulation software for 3.

The complete engine geometry together with these two exhaust systems is simulated using an engine simulation software package virtual 4. A typical ktm 2 stroke from the factory will easily do 210 psi and pound out plenty of torque more than a 250 or 300cc 4 stroke could ever hope for. A stroke refers to the full travel of the piston along the cylinder, in either direction. Porting and polishing twostroke motorcycle engines. 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. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. You should only rely on the experience of the very best. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. Crankcase and cylinder porting is probably the most controversial subject among performance 2 stroke engine builders. In most cases, the connecting rod is shortened the same distance that the big end bearing is moved.

Part of the problem is understanding the pulse or charge nature of the airflow in a 2 stroke engine. The cost to convert this program into a full windows program like our dynomation5, four stroke simulation would prevent it from ever being released. However, you shouldnt just pick any business that you can find anywhere. Proscons of head porting 4strokes general dirt bike. Optimization of exhaustpipe tuning on a 4stroke engine using. I know the less exhaust pipe curves the better and where it does curve try and make them long and flowing. Thats over a 50% increase in horsepower and 11 ftlbs more torque.