#Japan #Tokyo #BLDB #SEMTO ENGINE #ST-NF2

Unveiling the Silver Special Edition of SEMTO's Engine Kit

In an exciting development from BLDB, the online store specializing in metal models, a new variant of the SEMTO ENGINE has emerged: the ST-NF2/FS-L200AC Silver Special Limited Edition. This assembly kit features a striking silver metallic body that distinguishes it from the previously available red version.

The ST-NF2/FS-L200AC represents a meticulously designed 7cc inline twin-cylinder, 4-stroke engine assembly kit that goes beyond aesthetic appeal. It requires enthusiasts to construct the engine from components such as pistons, connecting rods, crankshafts, camshafts, and valves. Rather than a mere display piece, this model offers an interactive experience as users can fuel, ignite, lubricate, and start the engine once assembled.

A Fresh Take on an Existing Model

The announcement of this silver edition is not just a rehash of the existing model but introduces a new variation meant for lovers of fine engineering. With distinct silver accents, including a silver head cover, exposed pulley, and cooling fan, this kit enhances visual contrast when assembled. The arrangement assists builders in identifying the positions of the parts through the assembly process.

The design considerations extend beyond looks; it also aligns with practical display options. The silver finish seamlessly integrates with various display environments, including black or red tools, wooden workstations, and transparent cases. It’s important to note that despite the color change, the engine's specifications remain consistent, including its type, displacement, fuel, and starting method. When purchasing, ensure to select the variant titled 'Silver Special Limited Edition' on the product page.

Detailed Mechanics of the Engine

The engine configuration comprises two cylinders, each with a displacement of 3.5cc, leading to a total of 7cc. It has a bore of 16.6mm and a stroke of 17.0mm, capable of operating between 4,000 to 16,000 rpm, with a rated power of 0.6PS. This provides a unique opportunity to observe the intricate mechanical connections and the firing order, in contrast to single-cylinder models.

As the engine goes through its four-stroke cycle – intake, compression, combustion, and exhaust – builders can observe the synchronized action of the pistons and crankshaft. Attention to detail during assembly is crucial, including the correct positioning of pistons, tightening connecting rods, and assessing crankshaft resistance.

Advanced Valve Mechanism

The engine features a SOHC (Single Overhead Cam) system. The camshaft operates the intake and exhaust valves through short rocker arms, regulating timing in sync with the crankshaft's rotation. The design employs two synchronized belts to transfer rotation, aimed at minimizing gear slippage at high RPMs. Proper adjustment of the timing belts is a must followed by the assembly instructions to ensure smooth operation.

The silver head cover and exposed pulley not only enhance the aesthetic appeal but also maintain visibility into the valve mechanism for educational or demonstration purposes.

Starting System and Fuel Type

The engine utilizes an electric starting system powered by a 480 brush DC motor, requiring a 7.4V 2S lithium battery and a compatible charger. It employs a single carburetor for fuel delivery, adjusting the fuel needle to achieve the right mix. Initial start-up should follow guidelines to avoid abrupt changes in fuel settings, monitored in a safe and stable environment.

Unlike standard display models, this engine operates on a methanol-based glow fuel, mixed with 20-25% nitromethane. Important precautions include using designated glow plugs and fuel types, following the included manual for lubrication, mixing ratios, and application procedures.

Product Assembly and Display

The kit includes the SEMTO ST-NF2 Silver Engine Assembly Kit and an assembly manual, while additional items such as the battery, fuel tank, and fueling supplies need to be purchased separately depending on the selected configuration.

With dimensions of approximately 112×90×92mm and weighing about 535g, this compact model allows for thorough exploration of its components while providing the possibility of being a stunning tabletop display. However, it's essential to avoid operating with residual fuel in the unit for safety reasons.

Options and Pricing

Several configurations are available:

• - Engine Model Only: The base silver engine kit priced at 52,398 yen.
• - Engine Model with Starting Kit: A combination including starting supplies, priced at 69,086 yen.
• - Engine Model, Starting Kit, and Stand: A comprehensive set for 79,099 yen.

Note that prices and stock may vary, so it’s best to confirm on the product page during ordering.

Final Remarks

The SEMTO ST-NF2 engine model not only serves as a fascinating exploration into engineering concepts but also offers collectors a visually striking piece. For anyone interested in model assembly, mechanics, and engineering principles, this silver limited edition promises an insightful and impactful experience in the world of scale models.

For more details and to make a purchase, visit BLDB’s official store. For further updates on their engine model series, browse here.