BLDB Unveils Three Automotive Metal Models: Build the Mechanics of Motion

Build the “Reason for Movement” of a Car with Your Own Hands: BLDB Unveils Three Automotive Metal Models

BLDB (Building Block), a brand specializing in 3D metal puzzles and precision mechanical models, announced on August 15, 2026, the introduction of three new metal models from its “Engine Models” collection that focus on automotive and power mechanisms. These kits allow users to experience the internal workings of engines, from steam vehicles to L4 inline 4-cylinder and V2 engines, which are typically hidden from view.

The selected models are the “Steam Car Metal Model,” which reconstructs the vehicle structure of the steam era with 272 parts; the “L4 Car Engine Model DM111,” comprising over 380 parts to form an inline 4-cylinder engine and its drive mechanism; and the “V2 Car Engine Assembly Kit,” which creates the movement of a V-twin engine from 217 parts.

Shifting focus from exterior vehicle models, these new offerings emphasize “how power is generated and transmitted within the car body.” The completed steam car offers a full vehicle experience, while the L4 showcases neatly arranged inline cylinders, and the V2 features cylinders positioned in a V-shape. Each model provides a distinct perspective on automotive mechanics.

These are DIY kits where users assemble metal parts. The building process helps in understanding the spatial relationships between components, and upon completion, the electric mechanisms can be observed in motion. This lineup is ideal for car enthusiasts, individuals interested in understanding mechanical principles in three dimensions, and those seeking engaging adult craft projects.

Currently, the BLDB official online store is hosting a “Summer Bonus Sale.” Customers can receive a 20% discount on eligible items by entering the coupon code SUMMER20 at checkout.

Engine Models – Moving Metal Models List

Beyond the Bonnet: The Inner Workings of a Car Revealed Through Models

In actual automobiles, most power mechanisms are concealed under the bonnet or covers. While pressing the accelerator makes a car move, opportunities to observe the roles of pistons, cranks, shafts, and gears are rare.

Mechanical models bring these hidden structures to life on a desk, at a manageable size. As each part is assembled, the relationship of “this part transmits motion to the next part,” which can be hard to grasp from just looking at a finished product, becomes clear.

Assembly is not merely following instructions to reproduce a shape. It involves verifying part orientation, adjusting screw tightness, and checking for interference in movable sections. The accumulation of these small decisions leads to the completion of a machine. The moment it functions correctly provides a sense of accomplishment from building the structure oneself.

These three products offer a comprehensive view of automotive technology history and engine layout differences. The steam car demonstrates the overall vehicle and power transmission, the L4 highlights the orderly arrangement of four inline cylinders, and the V2 showcases two cylinders facing each other at an angle.

1. “Steam Car Metal Model”: Recreating the Steam Era Vehicle Structure with 272 Parts

The first model is the “Steam Car Metal Model,” which allows users to enjoy both the appearance of a car and its power transmission mechanism. Inspired by a steam traction car developed in France in 1928, it represents a period when steam cars and internal combustion engines competed as the next generation of transportation.

It incorporates elements that would later be adopted in automobiles, such as a front-mounted power unit, rear-wheel power transmission, chain drive, differential mechanism, and independent suspension. Its appeal lies not just in replicating the vehicle’s exterior, but in enabling observation of where power is generated and how it reaches the wheels.

The 272 parts are made from aluminum alloy, stainless steel, and electronic components. CNC processing and aluminum alloy oxidation treatment enhance the metallic texture and fine details. The finished size is approximately 24.5×10.7×13.4cm, and it weighs approximately 1,500g.

Assembly takes approximately 4 hours or more, with a difficulty rating of ★★★★☆. While requiring a certain level of concentration, it offers the satisfaction of seeing the body, drivetrain, and suspension gradually come together. Special tools, a storage case, and an instruction manual are included.

Upon completion, the model can be driven electrically with a built-in 500mAh lithium battery. Charging takes approximately 2 hours, and continuous operation is estimated at 30 minutes or more. Although it does not actually generate fuel or steam, users can enjoy building a historical vehicle and then driving it.

Product Overview

• Product Name: Steam Car Metal Model

• Parts: 272

• Materials: Aluminum alloy, stainless steel, electronic components

• Finished Size: Approx. 24.5×10.7×13.4cm

• Weight: Approx. 1,500g

• Assembly Time: Approx. 4 hours or more

• Difficulty: ★★★★☆

• Recommended Age: 10 years and older

• Battery: 500mAh, DC 5V

• Charging Time: Approx. 2 hours

• Continuous Operation Time: Approx. 30 minutes or more

• Display Price: 52,868 yen (incl. tax)

• Price after “DRIVE25” discount: 39,651 yen (incl. tax)

• Product Page

2. “L4 Car Engine Model DM111”: Assembling the Inline 4-Cylinder Engine

For those who wish to shift their focus from the entire vehicle to the heart of its power, the “L4 Car Engine Model DM111” is offered. L4 denotes an inline 4-cylinder engine, where four cylinders are arranged in a line. This model allows for the assembly of a three-dimensional metal representation of multiple pistons working on a single crankshaft.

The neatly arranged inline cylinders make it easy to trace connections between components from a sideways view, offering a clear way to observe mechanical structures. During assembly, parts that might seem unintelligible individually gradually connect to form cylinders, cranks, and surrounding mechanisms.

The body is primarily constructed from aluminum alloy and zinc alloy, featuring an anodized surface treatment. With over 380 parts, it builds an engine model approximately 190×140×185mm in size. The net weight is approximately 2.62kg. Despite being an engine-only model without a vehicle body, its metal density provides a substantial presence.

Assembly takes approximately 3 hours or more following the instructions, with a difficulty rating of ★★★★☆, and is suitable for ages 14 and older. Contents include over 380 parts, a charger, an English instruction manual, and a metal box. It is recommended to check the language of the manual before purchase and carefully match diagrams with part numbers during assembly.

After assembly, the mechanism can be operated at low speed by a 700mAh lithium polymer battery. Charging takes approximately 40 minutes, with an estimated operation time of about 30 minutes when fully charged. This is a scale model that reproduces internal movements using an electric motor, not a practical engine that burns gasoline.

Product Overview

• Product Name: L4 Car Engine Model DM111

• Type: Electric movable model based on an inline 4-cylinder engine

• Parts: Over 380

• Materials: Aluminum alloy, zinc alloy

• Surface Treatment: Anodized

• Size: Approx. 190×140×185mm

• Weight: Approx. 2.62kg

• Assembly Time: Approx. 3 hours or more

• Difficulty: ★★★★☆

• Recommended Age: 14 years and older

• Battery: 700mAh LiPo

• Charging Time: Approx. 40 minutes

• Operation Time: Approx. 30 minutes

• Display Price: 66,218 yen (incl. tax)

• Price after “DRIVE25” discount: 49,663 yen (incl. tax)

• Product Page

3. “V2 Car Engine Assembly Kit”: Creating the Rhythm of a V-twin Engine from 217 Parts

The third model is the “V2 Car Engine Assembly Kit,” featuring two cylinders arranged in a V-shape. Unlike the inline arrangement of the L4, the V2 positions its two cylinders at an angle. This configuration, with fewer cylinders, makes it easier to visually track the relationship between the left and right pistons and the central drive unit.

With 217 parts, users manually assemble the exterior and electric movable mechanism of a V-twin engine. Made from aluminum alloy and stainless steel, CNC precision processing and oxidation treatment create a mechanical outline that highlights gears and shafts.

Assembly time is approximately 3.5 hours, with a difficulty rating of ★★★★☆. The finished size is approximately 213×215×135mm, and it weighs approximately 3.5kg. Although it has fewer parts than the L4, precise work is required to combine the metal components in the correct order and orientation. It is advised not to judge the difficulty based solely on the number of parts; ensure a flat workspace and sufficient time.

Upon completion, it operates with an electric motor and a 500mAh lithium battery. Charging takes approximately 40 minutes, with an estimated operation time of 30 minutes or more when fully charged. The movement of the separated cylinders converging towards the center offers a visual experience distinct from that of inline types.

A metal gift box, charger, and instruction manual are included. This model is suitable as a gift for car or engine enthusiasts, as well as collectors who wish to compare different engine layouts side by side.

Product Overview

• Product Name: V2 Car Engine Assembly Kit

• Product Number: DM14-V2-T

• Type: Electric movable model based on a V-twin engine

• Parts: 217

• Materials: Aluminum alloy, stainless steel, lithium battery

• Size: Approx. 213×215×135mm

• Weight: Approx. 3.5kg

• Assembly Time: Approx. 3.5 hours

• Difficulty: ★★★★☆

• Recommended Age: 10 years and older

• Battery: 500mAh, DC 5V

• Charging Time: Approx. 40 minutes

• Operation Time: Approx. 30 minutes or more

• Display Price: 75,877 yen (incl. tax)

• Price after “DRIVE25” discount: 56,907 yen (incl. tax)

• Product Page

Comparing the Three: A New Perspective on Automobiles

The Steam Car is suitable for those who want to build a complete vehicle, including the power unit, wheels, and suspension. The L4, with the most parts, is for those who wish to progressively assemble an inline 4-cylinder structure. The V2 is recommended for those interested in V-type mechanisms, as the difference in cylinder arrangement is visually clear.

After completing one model, adding and arranging different types allows for a comparison of cylinder count, orientation, overall model size, and observable movements. Beyond individual appreciation of each product, contemplating “why designs differ” is also part of the enjoyment of mechanical models.

“BLDB Mechanical Car Fair” Overview

• Campaign Name: BLDB Mechanical Car Fair

• Period: August 14 (Friday) 0:00 to August 31 (Monday) 23:59 (Japan time), 2026

• Eligible Store: BLDB Official Online Store

• Eligible Products: The three vehicle metal models featured in this article

• Discount: 25% OFF from the regular selling price

• Coupon Code: DRIVE25

• How to Use: Add eligible products to your cart and enter the code on the checkout screen

• Usage Limit: One use per order

• List of Eligible Products

Prices are all inclusive of tax.
Discounted prices are based on the display on the official online store.
Please confirm coupon eligibility, usage limits, and combination conditions on the checkout screen.
Sales may end once stock runs out.
The campaign may be subject to change or termination without prior notice.
Please confirm shipping fees, estimated delivery dates, and return conditions on the official online store before confirming your purchase.

Before Assembly: Important Information

Each product contains small metal parts and requires the use of tools and rechargeable batteries. Recommended ages vary by product, so please check the latest product page and precautions before purchasing. If a child undertakes the project, ensure they meet the age requirements, and a guardian supervises the work as needed.

For assembly, a bright, flat desk, trays for sorting parts, and a protective mat for the desk are useful. Overtightening screws can place stress on movable parts, so adjust gradually according to the instructions. Before powering on the completed model, verify wiring, screw fixation, and ensure there is no interference between parts.

The engine models in this article are not practical engines that generate power through combustion. They are hobby models for display, observation, and recreation, reproducing mechanical movements with an electric motor. They cannot be installed in real vehicles or used for public road driving.

About BLDB (Building Block)

BLDB is a specialized brand dealing in adult-oriented 3D metal puzzles and precision mechanical models. It offers metal assembly kits with motifs such as automobiles, engines, aircraft, insects, animals, marine life, and architectural structures.

Through the process of assembling precision parts by hand and the time spent observing the structure and movement of the completed model, BLDB aims to convey the beauty of machinery and the joy of craftsmanship.

Overseas Expansion Principal: SHUEI NETWORK TRADING CO., LTD.

• Official Online Store

• Engine Models Collection

• Contact: info@bldb.jp

Important Notes

• These products are not actual vehicles. They do not have combustion or propulsion capabilities; they are assembly models that reproduce mechanical rotation using a motor.

• These products contain small metal parts and tools. Before use, please confirm the recommended age and safety precautions, and assemble in a stable workspace.

• Product specifications, accessories, and appearance may be changed without prior notice for quality improvement or manufacturing reasons. Please be aware in advance.