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Hot News: Beta Kembangkan Mesin 200 cc 3-Stroke… Bakal Bikin Geger Nih!

Kabar yang cukup mengejutkan datang dari brand motor off road asal Italia, Beta Motorcycles… Disebutkan oleh fans page Beta Enduro Motorcycles Australia, pabrikan kecil dari Italia ini kabarnya sedang mengembangkan motor enduro dengan teknologi 3-stroke. Yups, bro nggak salah dengar, 3-stroke. Bukan 2-stroke, apalagi 4-stroke. Kapasitas mesinnya sendiri adalah 200 cc dan akan diluncurkan pada akhir tahun 2017 ini untuk melengkapi jajaran produk model year 2018. Seperti apa detailnya?

Masih dari sumber yang sama, dikatakan bahwa Beta sudah melakukan riset mesin 200 cc 3-stroke sejak empat tahun terakhir. Mesin 200 cc 3-stroke diklaim memiliki performa seganas mesin 300 cc 2-stroke. Tapi ada nilai lebih pada mesin 200 cc 3-stroke, yaitu bobot total motor bisa berkurang hingga 9 kg. Secara teori motor dengan mesin 200 cc 3-stoke punya power-to-weight ratio paling gila! Gimana nggak? Power bisa setara dengan 300 cc 2-stroke tapi bobotnya jauh lebih enteng. Beta RR 2T 300, KTM 300 EXC, Husky TE 300, Sherco 300 SE-R, hingga Gas Gas EC 300 Racing bisa di-bully habis oleh Beta 200 RR berteknologi 3-stroke…

Sayangnya, bro nggak boleh berbahagia terlebih dahulu terkait kabar dikembangkannya motor enduro Beta 200 RR 3-stroke. Soalnya itu cuma dagelan yang dibuat oleh Beta Enduro Motorcycles Australia dalam rangka memperingati April Fools. Boleh bro baca sendiri penjabaran lengkap Beta Enduro Motorcycles Australia pada quote di bawah deh, mbulet dan ngelantur nggak karuan ke mana-mana. Ahihihihi… Waspada aja deh, 1 April gini banyak banget berita hoax yang sangat perlu disaring kebenarannya! Wkwkwkwwkk…

Beta Enduro Motorcycles Australia said:

Beta is set to revolutionise the off road motorcycle market with the addition of its new 200 RR 3 stroke……… Yep that’s right your not seeing things, 3 stroke technology is here, Beta’s new 200 RR 3 stroke is set to join the model range later this year with the release of the MY18 range….. The small Italian motorcycle manufacturer has spent the last 4 years developing this unique new technology that has allowed them to produce as much power as a 300 cc 2 stroke from a 200 cc 3 Stroke with the added benefit of eliminating almost 9 kg of weight the complex injected 200 cc 3 stroke design, it works on the basis of injected intake valves and uses exhaust ports, the heat from the firebox heats up the water in the boiler. Water is also heated by the heat from the hot gases going through the long tubes. As water becomes hotter, it turns into saturated steam which collects above the water. The regulator valve, which controls the passage of the steam to the cylinders, is situated in the dome. There are also safety valves on top of the boiler to release steam if the pressure tends to rise to a dangerous level.

The saturated steam flows through the main steam pipe to the superheater header. It then travels through superheater element pipes in the boiler where it is heated up. After coming out of these pipes through the superheater header, it will have become superheated steam. The extremely hot steam then flows through steam pipes to the cylinders where its pressure moves the pistons which move the wheels of the locomotive.
In the smokebox, exhaust steam passes through the blastpipe to the chimney at high speed due to the confined vent of the blastpipe. This creates a partial vacuum in the smokebox which provides the draw of the air to the firebox and ensures that the hot gases are drawn out of the firebox via the tubes in the boiler.

In a steam engine, the movement of the valve ensures that steam is admitted to and exhausted from the cylinder at the right moment. For a typical cylinder that has two ports, the function of the valve is to admit superheated steam at one end while allowing used or exhaust steam to escape at the other. As a result of covering and uncovering these ports in sequence, the piston is pushed forward and backward by the high pressure steam from the boiler. To regulate the movement of the valve, a mechanical valve gear system is used and this is discussed further in the following subsections.

To know how the valve affects the speed of the locomotive, we have to understand a few terms which are common among steam locomotives operators and enthusiasts. Lap refers to the amount of overlap between the valve and the port. In slow moving locomotives, the long lap on the exhaust port gives time for the steam trapped in the cylinder to expand fully to push the piston. On the other hand, on higher speed locomotives the exhaust port is made to open early (short lap) when the valve is in mid-position thus allowing the steam to escape faster. Furthermore, higher speed locomotives also have long lead which means that the admission port is already open when the piston is at the end of its movement so there is a sufficient steam pressure that will immediately pushes the piston back to begin its next movement.

Cut-off denotes the position of the piston, at the moment the valve is closing the admission port. When the engine is working hard and slowly, long cut-off admits steam for most of the stroke of the piston. On fast running locomotives this will cause back pressure to the boiler. To avoid unnecessary back pressure, cut-off is reduced so that steam is admitted for only 20% of the piston stroke and the remainder of the stroke is due to the expansion of the high pressure steam.

If you are are still reading at this stage and wish to order a new 200cc 3 stroke you can place pre orders with the tooth Fairy and all orders with be delivered by the Easter Bunny on the 1st of April 2018.