---
product_id: 629466057
title: "Technic Visible L-4 Engine Building Blocks, L4 Diesel Engine Model Kit, 10087 Creative Engine Building Kit, STEM Toys Engine Building Sets, Gift for Kids 14+ and Adults(1787pcs)"
brand: "mould king"
price: "HK$1355"
currency: HKD
in_stock: true
reviews_count: 5
category: "Mould King"
url: https://www.desertcart.hk/products/629466057-technic-visible-l-4-engine-building-blocks-l4-diesel-engine
store_origin: HK
region: Hong Kong
---

# Motorized piston movement Transparent casing reveals mechanics 1787 precision pieces Technic Visible L-4 Engine Building Blocks, L4 Diesel Engine Model Kit, 10087 Creative Engine Building Kit, STEM Toys Engine Building Sets, Gift for Kids 14+ and Adults(1787pcs)

**Brand:** mould king
**Price:** HK$1355
**Availability:** ✅ In Stock

## Summary

> ⚙️ Build brilliance, power your passion!

## Quick Answers

- **What is this?** Technic Visible L-4 Engine Building Blocks, L4 Diesel Engine Model Kit, 10087 Creative Engine Building Kit, STEM Toys Engine Building Sets, Gift for Kids 14+ and Adults(1787pcs) by mould king
- **How much does it cost?** HK$1355 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/629466057-technic-visible-l-4-engine-building-blocks-l4-diesel-engine)

## Best For

- mould king enthusiasts

## Why This Product

- Trusted mould king brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sleek Compact Display Size:** Perfectly sized at 32.6 x 23.4 x 20 cm to showcase your engineering prowess on any desk or shelf.
- • **Premium Build Quality & Fit:** High-quality parts rivaling LEGO standards ensure a satisfying, frustration-free build experience.
- • **STEM-Driven Educational Build:** Designed for ages 14+, this kit deepens understanding of combustion cycles and power transmission through immersive assembly.
- • **Authentic Inline-4 Engine Replica:** Experience real engine mechanics with moving pistons and crankshaft for hands-on engineering mastery.
- • **Motorized Operation Brings It to Life:** Watch the crankshaft rotate and valves fire in sequence, demonstrating true-to-life diesel engine function.

## Overview

The Mould King Technic Visible L-4 Engine Building Kit is a 1787-piece, motorized model replicating a real inline 4-cylinder diesel engine. Featuring transparent casing and precise mechanical details, it offers an authentic STEM learning experience for ages 14 and up. Compact and display-ready, this kit combines educational value with premium build quality, making it a must-have for aspiring engineers and enthusiasts alike.

## Description

Mould King Technic Visible L4 Engine Building Blocks, L4 Diesel Engine Model Kit, 10087 Creative Engine Building Kit, STEM Toys Engine Building Sets, Gift for Kids 14+ and Adults(1787pcs)

Review: Equal parts challenging and fun those who grew up with repairable autos. I owned dhoc 2.8 L and 3.2 l. straight six jaguars for much of my life. This straight four was the closest thing that was also at my price point. It took a week to build which is what I wanted. Tbe build was tricky for geezer fingers, but never more than that. As with most Mould King kits, parts fit well and were close to LEGO quality. Two commonly available pieces were missing, replaced by extra parts from other kits. There were also 18 extra parts in this kit (for future use).
Review: Seller is highly recommended

## Features

- Realistic L4 Engine Model: This 1787-piece building set replicates a real inline 4-cylinder engine with moving pistons, connecting rods, and a working crankshaftm, the design follows actual engine mechanics for an authentic building experience
- Functional Motorized Operation: Includes a motor to power the engine, demonstrating realistic piston movement and firing sequence, watch the crankshaft rotate and valves operate just like a real engine
- Accurate Mechanical Details: Features precise intake/exhaust paths, timing system, and belt-driven mechanisms. The transparent casing reveals internal workings for better understandin
- Educational Engineering Project: Designed for ages 14+, this set helps users learn engine mechanics, combustion cycles, and power transmission through hands-on assembly
- Compact Display Size: Measures 32.6 x 23.4 x 20 cm (12.8 x 9.2 x 7.9 inches), making it a great size for display while maintaining realistic proportions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CYBXMV1L |
| Assembly Required | Yes |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #58,426 in Toys ( See Top 100 in Toys ) #2,881 in Toy Building Sets |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (15) |
| Date First Available | 3 May 2024 |
| Educational Objective(s) | To support learning in engineering and mechanics, particularly for kids aged 14 and above. |
| Item model number | 10087 |
| Manufacturer recommended age | 14 years and up |
| Material Type(s) | Plastic |
| Number of Puzzle Pieces | 787 |
| Product Dimensions | 29.46 x 8.84 x 41.4 cm; 2.08 kg |

## Images

![Technic Visible L-4 Engine Building Blocks, L4 Diesel Engine Model Kit, 10087 Creative Engine Building Kit, STEM Toys Engine Building Sets, Gift for Kids 14+ and Adults(1787pcs) - Image 1](https://m.media-amazon.com/images/I/81XYbnBC28L.jpg)

## Questions & Answers

**Q: What should I do if some building pieces are missing from my set?**
A: 1.Free Replacement: Contact our store with your instruction manual photos of the missing parts, and we’ll ship them to you for free, no extra cost.

**Q: Are the building pieces compatible with other major toy brick brands?**
A: Our bricks are designed to universally align with standard-sized building systems for endless creativity.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***S on 11 February 2026*

Equal parts challenging and fun those who grew up with repairable autos. I owned dhoc 2.8 L and 3.2 l. straight six jaguars for much of my life. This straight four was the closest thing that was also at my price point. It took a week to build which is what I wanted. Tbe build was tricky for geezer fingers, but never more than that. As with most Mould King kits, parts fit well and were close to LEGO quality. Two commonly available pieces were missing, replaced by extra parts from other kits. There were also 18 extra parts in this kit (for future use).

### ⭐⭐⭐⭐⭐ Review
*by R***N on 13 October 2025*

Seller is highly recommended

### ⭐⭐⭐⭐⭐ Review
*by J***K on 31 August 2025*

This was a challenge but I enjoyed every minute of it. There were zero missing pieces. I am looking forward to the next challenge.

## Frequently Bought Together

- Mould King L4 Engine Building Blocks, Mini Engine Model Kit, 10087 Creative Motor Building Kit, STEM Toys Sets, Gift for Kids 14+ and Adults (1787pcs)
- Mould King 10088 V8 Engine Model Kit - 535 Pcs to Build Your Own Mini Engine That Works - DIY STEM Mechanic Engineering Construction for Kids/Teens, Hobby Building Blocks Kit for Adults
- Mould King W16 Engine Building Blocks Set, Combustion Engine Model That Runs, Mini Engine Build Kit for Adults with Battery and Motor, Engineering Construction STEM Toy for Children Boys Girl(952 Pcs)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-23*