Why you should buy Bimotion : - unique, modern, user friendly and in depth programs. If you increase the timing AND increase the size of the intake of the cylinder port at the carb consistently towards the port, you will decrease velocity at lower RPMS and facilitate more flow at higher rpms. touring models. You can click on the label of any of the form fields for. The calculated compression ratio is usually referred to as the. $109 CIF Clutch Drum for Vespa PTS. 95 - Add $5. There are three ports are present in the two stroke cycle engine. Two types of typical port timings for a two-stroke engine controlled by piston . Please view the Gallery section of this website. 2-Stroke Engine Porting Service Whether you’re into racing motocross or recreational dirtbikes, ATV or Snowsleds, for maximum performance, 2-Stroke Cylinder Porting from Rich’s Taylor'd Porting puts the “power” in powersports. Two Stroke Port Timing Calculator, vindo do desenvolvedor Dockerty Electronics, está rodando no sistema Android no passado. Unlike automobiles, saws have a very limited means to change their 'gearing' - sprockets, to a small extent - chains, and bars. The clearance can be measured with the help of some plumbers solder before and after the machining work. The address is P. Sticky demonstrates how to use the Buzzwangle Tool #1 to calculate your port timing on a 2-stroke engine after first securing the cylinder . Port Timing Diagram Of 2 Stroke Engine – Mesin 2 langkah bekerja dengan membuka dan menutup lubang-lubang cylinder oleh turun naiknya piston. This script calculates the approximate two cycle engine timing duration for the open port. Then do the same with the 250 flywheel & see if they are at the same place. Then mark that spot on the degree wheel, also marking the piston position. Start new topic. I've mostly worked on 50-55cc 2-stroke race engines and 70-80cc, and used carburetors from 24 to 32mm. ca on July 23, 2022 by guest. 4 mm (4. 1 hp at crankshaft (25. Power. Off Topic Section. After entering the stroke and rod length, enter: (a) the port. Then mark that spot on the degree wheel, also marking the piston position. Online Purchasing. 2: Komet K78 TT porting. Enter the values for stroke, connecting rod length and port height (piston above BDC). Outside The U. 636" and an effective volume of only 309. Enter the values for stroke, connecting rod length and open duration (in degrees) of the port. It could be timing, it could be an oil seal, the pistons rings, it could be carb or intake related, or it could be your oil pump ifyou have one. 51 deg atdc. com> for all your porting and high-performance engine modification needs. Info BIKE DYNAMICS Here you’ll be able to compare 2 bikes with different specifications in order to analyse the results and possible differences obtained. One field must have a value to calculate the other. Jul 28, 2011 · Highway Hourly Fuel Consumption Calculator. Off Topic Section. EPO- 70 ° before BDC TPO - 60° before BDC TPC - 60° after BDC EPC - 70° after BDC IPO - 50° before TDC Ignition- 20° before TDC IPC - 50° after TDC The angle slightly varies with engine design and specifications. Two Stroke Port Timing Calculator allows you to relate crank angles to piston stroke position relative to T. ) Since the two stroke engine fires on every revolution of the crankshaft, a two stroke engine is usually. 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). 2006 Suzuki LTZ250. (1) enter the piston (port) height value and click "Calculate Duration" to get the open duration -or- (2) enter the open duration value and click "Calculate Height" to get the piston height. Updated on. Note: all models listed in this manual come equipped with either a 250cc or 280cc air-cooled, 4-stroke, single-cylinder engine with a single overhead. Porting refers to the process of enlarging and shaping the intake, exhaust, and transfer ports around the cylinder of your 2-stroke engine. Show more. 0 has an added optimisation simulation feature that designs optimal exhaust systems and piston ports that give maximum power or torque over specified speed ranges of 2-stroke engines. I started mapping it recently in order to calculate the port sizes before cutting the ports. Cylinder Length Modification (if necessary to properly set deck height for correct squish clearance) Degreed in port timing. It requires values for stroke, piston height, conrod length, and wrist pin offset. 14014416 305 HO, 80-85, 58cc, 1. Enter the values for stroke, connecting rod length and port height (piston above BDC). $40 CIF Carbone Front Suspension Vespa VN1-2, VM1-2. Duration: This is open duration of the port in degrees. Portal Web interface to explore, filter & track. A timing mark is an indicator used for setting the timing of the ignition system of an engine, typically found on the crankshaft pulley (as pictured) or the. At high rpms the delivery ratio of fuel/air becomes less and the pumping loss of. Port Timing Calculators. Typically a pressure wave return time is. As a rule, when porting and polishing your 2-stroke engine cylinder, you’re attempting to match the size of the intake manifold and intake port, as well as the exhaust manifold and exhaust port. 2 stroke port timing calculator. (1) enter the piston (port) height value and click "Calculate Duration" to get the open duration -or- (2) enter the open duration value and click "Calculate Height" to get the piston height. 13 in Return Port Size: 0. 13 in 0. gw; dr. As a rule, when porting and polishing your 2-stroke. The 509 cam closes the intake valve @ 74° ABDC, giving an effective stroke of 2. D= (180-cos^-1 ( (T^2+R^2-L^2)/ (2*R*T)))*2. Two Cycle Engine Port Timing Calculator. There are also tools you can use, like Two Stroke Timing Moped Tuning - A website and Android App to help you tune your moped, calculate port size and timing, with focus on Puch Maxi. Two stroke oil calculator. completion of the compression stroke , the inlet port open 10-20 degree before the piston reaches the TDC. Up to 230hp engines that air flow is fine. ini adalah hasil daripada formula yang ada dalam two stroke book tuner dimasukkan kedalam microsoft excel bagi memudahkan kerja. You can get a. Bore-Piston check. Con rod length - basic list in pop up menu below. As soon as it closes the port completely again, take a second reading on the wheel. 2 Stroke Engine Port Timing. The conventional transfer port of the upper solution (the port at the right side of the cylinder) can be open to the crankcase, as in the conventional two-stroke. Blowdown tuning starting points for single EX-port kits (Crazy Wayne) 16% to 17. Click here for a list of my for-sale spreadsheet calculators for 2 stroke design, including this one. (b) enter duration and click "Calc Height" to get the port height. 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. Funny thing is, a 55cc engine produces about as much peak. Does this look like the correct timing for a 2 stroke engine,. (1) enter the piston (port) height value and click "Calculate Duration" to get the open duration -or- (2) enter the open duration value and click "Calculate Height" to get the piston height. 13 in Bore to Rod Area Ratio: nan. (1) enter the piston (port) height value and click "Calculate Duration" to get the open duration -or- (2) enter the open duration value and click "Calculate Height" to get the piston height. Just put a length of it across the top of the piston (left to right) after taking off the cylinder head and glue its center to the piston. Aug 08, 2007 · This form calculates the displacement and timing events for piston ported, two-stroke model engines. FA Italia Scooter Cover Indoor VESPA. If you look at most 2-st timing curves they start out advanced and then it’s reduced at higher rpm. IGNITION TIMING ADVANCE. 0. After entering the stroke and rod length, enter: (a) the port height and click "Calc Duration" to get the duration or. Zero the degree wheel when the piston is at top dead center, then rotate the engine untill the f mark comes up. MOTA-7 is a 2-dimensional simulation model, the exact same program we have been supplying as a trial with the later MOTA v6. External oil lines and internal piston oilers. D= (180-cos^-1 ( (T^2+R^2-L^2)/ (2*R*T)))*2. Please note: that no credit will be given for unused fuel. oil %, enter your chosen oil %: %. ca on July 23, 2022 by guest. 50 Granturismo GT186 T-shirts £ 12. 91 polaris trailboss 350. 51 deg atdc. T = R + L + C - E. First firmly fix down your cylinder and then use a thin feeler gauge to establish when the ports of your engine are opened and closed by the piston. Bimotion 2-stroke Software At Bimotion, our mission is since 1991 to develop user friendly commercial grade two stroke software, at an affordable cost for amateurs and professionals alike. In the previous articles, we have discussed the 2 stroke petrol engine working principle. Stroke - click here for a list of stock bikes: [ Lambretta ] [ Vespa] Then you need to know one of the following: Timing in degrees before top dead. Two Stroke Port Timing Calculator als. Enter the timing in degrees that you require into the calculator below and it will tell you how many millimeters the piston needs to travel before TDC, you then turn the flywheel anticlockwise until the dial gauge reads that number. One field must have a value to calculate the other. Information Wanted! Please let us know ! Check out some User's of our Software. 0 gal 0 in 3 0. Search this website. because mounting thinner gaskets lowers the port timing and . After entering the stroke and rod length, select either field to calculate. By the way this is also the philosophy for non-piped heli engines. For example, this calculator shows that a person 170 cm tall and weighing 70 kg will produce a power output of 39 Compression Ratio At the Brunswick Marine headquarters after the Miami Boat Show there’s innovation in the air: the new Mercury V6 Four Stroke will be available this summer in the 175, 200 and 225 HP powersteps 20:1 is: Output. By SLORYDER, June 3, 2009 in Banshee Repairs and Mods. General Scooter Chat. Two Stroke Port Timing Calculator, vindo do desenvolvedor Dockerty Electronics, está rodando no sistema Android no passado. You can get a. By Marianto Posted on April 24, 2022. The process includes. Bore-Piston check. Jan 15, 2019 · To begin the ignition setting sequence, the mechanic should remove the spark plug as this will make it easier to turn the engine over for piston positioning. Exhaust port The diagram which shows the position of crank at which the above ports are open and close are called as port timing diagram. In the previous articles, we have discussed the 2 stroke petrol engine working principle. Two-stroke Engines In two-stroke engines, the Thermodynamic cycle will be completed within the one revolution of the []. We believe that using this software will help your 2-Stroke development or racing results on different types of competition. But now we are going to discuss the port opening and closing timings in the 2 stroke engine by drawing a Port Timing diagram. Height: This is the Port Height Above BDC. combustion chamber volume. if a port opens at 100° (after TDC) and close at 260° the duration is 160° (for intake you will have to use BDC as reference) TDC/BDC: Top Dead Center (piston top position), Bottom Dead Center (piston bottom position) Displacement: The “CC” (cm3) of your engine, (½bore * PI * stroke). sponsored by CC Specialty Tools. Hand tighten the compression gauge only! Do not use any type of tool to get it tight. 2 For Windows 98, XP, NT, Vista, 7, 8, 10 Program features: Calculates port heights from durations, or durations from port heights Assign fixed relationships between transfers and exhaust port. The other transfer 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. - educational with embedded recommendations. And the same pattern is to be observed in increases to transfer port time-area, though in the opposite direction. Height: This is the Port Height Above BDC. He also proved that the return waves are generated all along the length of the diffuser and baffle cones. One field must have a value to calculate the other. Mileage Compensation Calculator. read more 2 Stroke Fuel/Oil Ratio Calculator Calculate the needed fuel/oil ratio dependant on your oil, type of riding, max RPM, and type of cylinder cooling. 13 in Return Port Size: 0. There is one or more forward-located exhaust ports, two or more side transfer ports, and one rear intake port. The port timing diagram gives an idea about when a phase of the two-stroke cycle takes place. - educational with embedded recommendations. Blowdown tuning starting points for single EX-port kits (Crazy Wayne) 16% to 17. R is stroke divided by 2. Download Two Stroke Port Timing Calculator APK Untuk Android. Banshee Repairs and Mods. Since no one can reclaim lost time, it’s important to make the most of the time one has on Earth. Port timing is the degrees of crankshaft rotation after TDC to where port starts to open. Below are notes on my free spreadsheet of 2 stroke calculators. Handy Hints. They are inlet port, transfer port (transfer fuel from the crankcase to the cylinder) and an exhaust. Porting Calculator V4. After entering the stroke and rod length, enter: (a) the port height and click "Calc Duration" to get the duration or. May 09, 2011 · This formula can be used when you measure port distance with a caliper. In one. sebulan lebih jugak kiter stu. Download: Two 2 Stroke Exhaust & Transfer Port Open Duration APK (App) - ✓ Latest Version: 11 - Updated: 2023 - cal. If you port for high RPM power then your low/mid-range power will suffer. Jetting By Power, Not Color * Reading Plug and Piston * Needle Clearance * Too much Synthetic Oil. We believe that using this software will help your 2-Stroke development or racing results on different types of competition. Other Projects. Blowdown tuning starting points for single EX-port kits (Crazy Wayne) 16% to 17. 13 in 0. Physics, Calculations, Designing, etc. Thread the engine compression gauge into the spark plug hole for the number 1 engine cylinder. 13 in Return Port Size: 0. You can then mark the Mag housing at the position of the arrow on the flywheel to mark your desired degrees. Then mark that spot on the degree wheel, also marking the piston position. i am . 1950cc fast road stage 2 fully balanced with clutch and lightened flywheel. Acquista Buzzwangle digital degree ignition and port timing tool for all 2 & 4-stroke engines dalla categoria Spare parts in cui troverai Spare parts, . 50 Granturismo GT186 T-shirts £ 12. MOTA-7 is a 2-dimensional simulation model, the exact same program we have been supplying as a trial with the later MOTA v6. The formula for calculating timing is; D= (180 - Cos (T²+R²-L²)/ (2*R*T))*2. After entering the stroke and rod length, enter: (a) the port height and click "Calc Duration" to get the duration or. Two-stroke Engines In two-stroke engines, the Thermodynamic cycle will be completed within the one revolution of the []. - educational with embedded recommendations. My 2 Stroke Design Spreadsheets. Duration: This is open duration of the port in degrees. 1950cc fast road stage 2 fully balanced with clutch and lightened flywheel. 2006 SUZUKI LTZ250, 2006 Suzuki LTZ250250cc 4 stroke engine5 speed auto-clutch transmissionReverseE-startShaft driveGreat entry level sport machine. Two Stroke Port Timing Calculator allows you to relate crank angles to piston stroke position relative to T. In a two-stroke engine it is standard practice to calculate compression ratio based on the trapped swept volume i. 4 mm^2 * 2 front ports. It indicates, "Click to perform a search". 96 lowest to 190. The port heights, widths, areas, directions they flow, and relationships to one another all have a significant influence on how the engine will behave. Two calculators here for those that use percent and those that use ratio. $40 CIF Carbone Front Suspension Vespa VN1-2, VM1-2. Conod Length: mm. Two Stroke Expansion Chamber Design Professor Blair's tests proved that the return waves timing can be calculated fairly closely using the straight distances and the pressure wave speed in the pipe for that distance. The timing plot reminds “4-stroke” timing plots:. Two Stroke Performance Tuning Fig. The way to calculate the return timing and length of the negative wave in a 2 stroke expansion chamber is by this formula: WRT1=(D1x2)/SW where WRT1 is the wave return time for the first part of the wave, D1 is the distance from cylinder port to beginning of diffuser, and SW is the speed of the wave which is determined by the temperature and. 51 deg atdc. But now we are going to discuss the port opening and closing timings in the 2 stroke engine by drawing a Port Timing diagram. 602 lift and duration @. Know exactly how to advance / retard your Ignition ( in degrees and milimeters ). Duration: This is open duration of the port in degrees. Inlet port 2. Using these. The script called by this form does a reasonable amount of error checking on the parameters supplied, but is probably not fool-proof. A pointer for the timing disc can be made from a piece of bent wire secured under a suitable front. The engine design utilizes metric-sized components and hardware for ease of service and commonality with the remainder of the tractor. Two Stroke Port Timing Calculator for Android - APK Download Two 2 Stroke Inlet Port Open Duration Calculator for PC / Mac / Windows 7. 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. It is a 2-stroke engine simulator only, based on the MOTA simulator, but with a 2-dimensional scavenging model. I was wanting to calculate how much I need to change the port to gain a . ) and stroke of 136 mm (5. Please view the Gallery section of this website. Contemporary two-stroke technology was introduced initially to Suzuki, and later to Yamaha in Japan when Ernst Degner defected from East Germany to join. You can also save and load the data by using the provided functions. ew; hg. Port Timing Diagram for 2-Stroke Engine. General Scooter Section. The answer is then calculated as 79. Two Stroke Port Duration Port Timing Basics Air/gasoline enters the engine from the carburetor at a ratio close to 15:1. & Exhaust Valve Stem Seals 4 pack for Harley Shovelhead 1981-1984 by James Gaskets JGI-18000-81-10 James Gasket Exhaust Port Gaskets. 0. It enters via the intake port (as the piston . Porting Calculator V4. SETUP PORTS TIMING CHANGING GASKETS. Advancing the timing is pretty simple. This results in an engine that has a very mild break from 4 stroking to 2 stroking and back down (eliminate run away). 0 gal Velocity: nan in/s nan in/s Stroke Time: nan s nan s Force: 0 lb 0 lb Return Port Flow: nan gpm nan gpm Extend Port Size: 0. You just need to calculate the current timing. After entering the stroke and rod length, select either field to calculate. 50 Granturismo GT240 T-shirts £ 12. Jul 31, 2011 · This script calculates the approximate two cycle engine port height (piston above BDC) for timing opening and subsequent closing. 0 gal 0 in 3 0. Download Two 2 Stroke Exhaust & Transfer Port Open Duration APK for Windows . We believe that using this software will help your 2-Stroke development or racing results on different types of competition. craigslist furniture fort worth texas
Porting refers to the process of enlarging and shaping the intake, exhaust, and transfer ports around the cylinder of your 2-stroke engine. . 2 stroke port timing calculator
I like to tinker with engines, and the complexities of the poppet-valve four-stroke make modifications very expensive. - very fast and efficient design tool. For purposes of OUR calculator, we define Duration as the number of degrees of crankshaft rotation that a port is open. 4 mm^2 or 10. Port Timing Diagram Of 2 Stroke Engine – Mesin 2 langkah bekerja dengan membuka dan menutup lubang-lubang cylinder oleh turun naiknya piston. bobcat machine pfizer omicron vaccine march 2022 is southeast portland safe Tech north whitehall police department terravida abington phone number takeoff and landing distance calculator electrolux dryer. SIP Timing Indicator for ignition adjustment 360°. 5% to 18. Next, the crankshaft must be rotated to give the largest opening of the contact points — typically around TDC. 2 For Windows 98, XP, NT, Vista, 7, 8, 10 Program features: Calculates port heights from durations, or durations from port heights Assign fixed relationships between transfers and exhaust port. pt; pk. Products Products. Another one is Jaap's Puch Calculator. Nov 06, 2005 · First with the stock flywheel on. This form calculates the displacement and timing events for piston ported, two-stroke model engines. 11-14-2012, 10:01 PM #2. It takes into conideration the lengthening of the connecting rod when it gets real hot which lessens the durations. L is the connecting rod length (90mm in a Puch, 85mm in a V1) C is the distance of the crown of the piston to the top of the cylinder in TDC (Deckheight) E is the distance between the port and the top edge of the cylinder. 0. Rod Length: Enter the Conrod Length. Click on the piston position button within the Calculate box. 2-strokes kick ass!!!. Data can be input and calculated in any designation so long as it is consistent. 050-inch of 232/240 and a double roller timing chain are used in the crate engine, as. Duration: This is open duration of the port in degrees. One field must have a value to calculate the other. For purposes of OUR calculator, we define Duration as the number of degrees of crankshaft rotation that a port is open. (from the time the intake port closes) Squish design is pretty basic with a center plug but clearance may become empirical. Since a 2 stroke has combustion once every crank cycle (whereas the 4 stroke combusts once every 2 cycles) then the pistons top temperature can get high enough to melt it at high engine revolutions with the timing advance equal to that of a 4 stroke engine. One field must have a value to calculate the other. Exhaust and main transfer timing can be entered by mouse click on graph, or typed in. You need to have an accurate set of measurements for the subject engine. Height: This is the Port Height Above BDC. Pallet Rate Calculator: Full Size (L120xW100xH210cm up to 1200kg). Enter the values for stroke, connecting rod length and open duration (in degrees) of the port. Degrees are in both. Sep 02, 2022 · After entering the stroke and rod length, select either field to calculate. Off Topic Section. Jetting By Power, Not Color * Reading Plug and Piston * Needle Clearance * Too much Synthetic Oil. 00 in 2: 0. I started mapping it recently in order to calculate the port sizes before cutting the ports. 13 in Bore to Rod Area Ratio: nan. T = R + L + C - E. Handy Hints. Bimotion 2-stroke Software At Bimotion, our mission is since 1991 to develop user friendly commercial grade two stroke software, at an affordable cost for amateurs and professionals alike. Parts fit Coolster ATV-3125R. Do not mix designations. to B. 2 Stroke Cylinder Mapping - Part 2. Need diagram of all alignment marks. Two Stroke Port Timing Calculator, vindo do desenvolvedor Dockerty Electronics, está rodando no sistema Android no passado. 5% of transfer timing with stock or weak hitting pipes up to 8,500RPMs with 154deg to 165deg exhaust. Porting refers to the process of enlarging and shaping the intake, exhaust, and transfer ports around the cylinder of your 2-stroke engine. 13 in 0. And the same pattern is to be observed in increases to transfer port time-area, though in the opposite direction. 00 Granturismo GT 240/250 Small End Bearing £ 10. 1 hp at crankshaft (25. This is a problem with some high performance engines that once on step the carb cannot modulate the power very well. The dry seal runs on the magnero side and the wet seal runs in oil on the tranny side. Why you should buy Bimotion : - unique, modern, user friendly and in depth programs. 0 gal Velocity: nan in/s nan in/s Stroke Time: nan s nan s Force: 0 lb 0 lb Return Port Flow: nan gpm nan gpm Extend Port Size: 0. This representation is known as a port timing diagram. SETUP PORTS TIMING CHANGING GASKETS In 2-stroke engines the presence of the gaskets between the cylinder and the head, and between the crankcase and the cylinder, can allow to modify many characteristic parameters simply by varying the thickness of the gaskets. Calculate the correct dimensions for the bottle to resonate right at the RPM range before the engine gets "on the pipe" which is when there is a bad power dip which the bottle counters. 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). 06) MPH =. At a minimum, you need to enter values for the bore and stroke, although this will only calculate the engine displacement. combustion chamber volume. Zero the degree wheel when the piston is at top dead center, then rotate the engine untill the f mark comes up. Advancing the timing is pretty simple. DR performs their extensive port modification process on all 2-Stroke cylinders it ports. Portal Web interface to explore, filter & track. The port timing diagram gives an idea about when a phase of the two-stroke cycle takes place. The BGM cylinder is longer/taller to accommodate a. 2006 Suzuki LTZ250. port timing calculator values. 13 in Bore to Rod Area Ratio: nan. 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. Porting a modern 2-Stroke engine can improve the ride-ability of your machine as well as improve the power. For Windows 98, XP, NT, Vista, 7, 8, 10. Contemporary two-stroke technology was introduced initially to Suzuki, and later to Yamaha in Japan when Ernst Degner defected from East Germany to join. Contemporary two-stroke technology was introduced initially to Suzuki, and later to Yamaha in Japan when Ernst Degner defected from East Germany to join. Jan 15, 2019 · To begin the ignition setting sequence, the mechanic should remove the spark plug as this will make it easier to turn the engine over for piston positioning. (b) enter duration and click "Calc Height" to get the port height. L = Conrod length. Tips from TJ on Porting and Polishing 2 Strokes. 13 in 0. This list is a work in progress. Piston Crown to Top of Barrel at TDC: mm. (1) enter the piston (port) height value and click "Calculate Duration" to get . Next, the crankshaft must be rotated to give the largest opening of the contact points — typically around TDC. I was wanting to calculate how much I need to change the port to gain a . Download: Two 2 Stroke Exhaust & Transfer Port Open Duration APK (App) - ✓ Latest Version: 11 - Updated: 2023 - cal. Sep 02, 2022 · After entering the stroke and rod length, select either field to calculate. You'll need to know your engine's. To calculate the estimated charging time of a fully discharged battery, divide its ampere-hour rating by the amperage of the charging current. Search this website. You wish to measure the exhaust port timing, so you remove the . ini adalah hasil daripada formula yang ada dalam two stroke book tuner dimasukkan kedalam microsoft excel bagi memudahkan kerja. Banshee Repairs and Mods. sponsored by CC Specialty Tools. At a minimum, you need to enter values for the bore and stroke, although this will only calculate the engine displacement. The port timing angle (shown in blue) is then 260° - 100° = 160°. 430 HP at. After entering the stroke and rod length, select either field to calculate. By superfatcat22, March 6, 2014 in Motorcycle. Search this website. Height: This is the Port Height Above BDC. Jul 31, 2011 · This script calculates the approximate two cycle engine port height (piston above BDC) for timing opening and subsequent closing. 91 polaris trailboss 350. Two Stroke Port Timing Calcula App 1. Top Dead Center (TDC) is the top of the piston's stroke and Bottom Dead Center (BDC) is the bottom of the piston's stroke. Rod Length: Enter the Conrod Length. Open the intake port's setup window by clicking on the button to the right of its duration display (they do not all have to be set up together). Chainsaw Cutaway #2 : 2 stroke port timing explained!! Tinman's saws 36. Off Topic Section. Log In My Account vz. By using the Torqsoft exhaust time-area programme, it was possible to raise the power output of the engine. 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