Top 5 Best-Selling Products of 2025 on Enginediyshop

Customer Favorites Worth Building This Year

In 2025, thousands of builders around the world chose Enginediyshop for their mechanical DIY projects. Based on real sales data, these five products became our best-selling models of the year, standing out for their design, performance, and overall building experience.

If you’re planning your next build—or looking for a proven favorite—these top sellers are a great place to start. Even better, select models are currently available with special discounts.

1. RETROL SE-02 Metal Steam Engine & Boiler Model

2025 Best-Selling Product

The RETROL SE-02 ranked as the No.1 best-selling product of 2025. This reversible horizontal steam engine features a complete boiler system, generator, and street lamp, offering a highly immersive and visually striking build.

Why it’s so popular:

• Reversible horizontal steam engine design

• Full metal construction with premium finish

• Includes generator and working street lamp

• Strong visual impact and display value

Ideal for:
Steam engine enthusiasts, collectors, and builders who enjoy classic industrial aesthetics.

💰 Current Offer: 20% OFF. In-stock items, no waiting, ships within 24 hours. 

2. CISON Small Block 44cc 1/6 Scale V8 Engine

Top-Selling Gasoline Engine Model

The CISON 44cc Small Block V8 is one of the most advanced internal combustion engine kits on our site. With a realistic V8 layout and water-cooled system, it delivers an authentic engine-building and running experience.

Key features:

• 1/6 scale V8 gasoline engine

• Water-cooled, 4-stroke, 8-cylinder design

• Precision CNC metal components

• Powerful performance and realistic sound

Ideal for:
Advanced builders, engine collectors, and serious mechanical hobbyists.

💰 Current Offer: 15% OFF. Pre-order now, shipping in March.

3.RETROL SE-01 Full Metal Beam Steam Engine Model 

Best-Selling Classic Steam Engine Kit

This RETROL horizontal boiler steam engine combines traditional steam power with a centrifugal flyball governor, making it both educational and mechanically fascinating.

Why builders choose it:

• Classic steam engine layout

• Flyball governor for speed regulation

• Full metal DIY construction

• Smooth operation and strong educational value

Ideal for:
Mechanical learners, educators, and vintage engine lovers.

💰 Current Offer: 20% OFF. In-stock items, no waiting, ships within 24 hours. 

4. RETROL HM-01 7cc Hit and Miss Engine 

Most Popular Antique-Style IC Engine

The RETROL HM-01 recreates the iconic hit-and-miss engine design, known for its distinctive operating rhythm and antique charm.

Highlights include:

• 7cc 4-stroke horizontal engine

• Authentic hit-and-miss governing system

• Classic stationary engine appearance

• Fully functional working model

Ideal for:
Collectors, history-focused builders, and fans of early internal combustion engines.

💰 Current Offer: 15% OFF - Limited Stock.

5. RETROL SE-03 Steam Engine With Generator & Light

Top Entry-Level Steam Engine of 2025

The RETROL SE-03 is a compact and beginner-friendly steam engine model that remains extremely popular thanks to its accessibility and charm. Despite its smaller size, it offers a complete working steam system with a generator and lamp.

Why it’s loved by beginners:

• Simple and approachable DIY build

• Working steam engine and boiler

• Includes generator and lamp stand

• Vintage steampunk workshop style

Ideal for:
Beginners, educational demonstrations, and gift buyers.

💰 Current Offer: 15% OFF. In stock. Ships within 24 hours.

Why These Models Dominated Sales in 2025

Across all five best sellers, customers consistently valued:

• Real working mechanical systems

• High-quality metal craftsmanship

• Hands-on learning experiences

• Strong display and collection appeal

These products reflect the core philosophy of Enginediyshop: turning mechanical engineering into an engaging and rewarding DIY experience.

Build with Confidence — Choose a 2025 Best Seller

If you’re unsure where to start, choosing one of our 2025 best-selling models means you’re building what thousands of customers already trust and enjoy.

👉 Explore these top sellers today and take advantage of current discounts while they last.