Meet the New RETROL & OKMO 1115 Mini Gas Engine: Classic Machinery in 1/7 Scale

Some engines are remembered not because they were large or powerful, but because of the mechanical simplicity and reliability they represented.

The new RETROL & OKMO 1/7 Scale 1115 Mini Fixed Water-Cooled 4-Stroke Gas Engine brings the character of a classic agricultural engine to the desktop in a remarkably compact form. Inspired by the traditional 1115 diesel engine, this miniature working engine combines vintage industrial design with functional mechanical systems that can actually be observed in operation.

And for collectors and engine enthusiasts, there's an even better reason to take a closer look: the new 1115 Mini Engine is currently available with a limited-time $100 OFF offer, with shipping scheduled for December.

A Miniature Tribute to the Classic 1115 Engine

The original 1115 engine became associated with agricultural machinery such as walk-behind tractors, irrigation pumps, and other utility equipment.

The RETROL & OKMO miniature version recreates the distinctive mechanical character of this classic design at approximately 1/7 scale.

Measuring around 14.5 × 11 × 11.5 cm, the model features a horizontal single-cylinder configuration, a 16mm bore, 19mm stroke, and approximately 3.6cc displacement. Despite its compact size, the engine is designed as a functional gasoline engine rather than a static display model.

Its compact size makes it particularly suitable for a desktop workshop, engine collection, or mechanical display where you can observe the movement and operation of the engine up close.

Real Mechanical Details, Not Just a Display Piece

One of the most interesting aspects of the 1115 Mini Engine is the attention paid to its mechanical systems.

The engine body uses cast brass, complemented by a stainless-steel flywheel, creating the solid metallic appearance associated with traditional machinery.

But the real appeal goes beyond the exterior.

Mechanical Piston Oil Pump

Instead of relying on an electric oil pump, the model uses an engine-driven piston-style oil pump.

As the engine operates, the mechanical system delivers lubrication to critical moving components. This allows users to see and understand how mechanical lubrication works in a traditional internal combustion engine.

For anyone interested in mechanical engineering, this is more than just an aesthetic detail—it is part of what makes the model enjoyable to operate and study.

Classic Evaporative Water Cooling

The 1115 Mini Engine also recreates the classic hopper-style evaporative water cooling system.

Rather than using a circulating water pump, heat is dissipated through the natural evaporation of water from the cooling reservoir.

The reservoir is also equipped with a drain valve, making it easier to remove the cooling water after operation without disassembling the system.

This distinctive cooling method adds another layer of mechanical authenticity to the miniature engine.

Fine-Tune the Ignition Like a Real Engine

Another highlight is the mechanical ignition system.

The 1115 Mini Engine uses a single-wire mechanical contact-point ignition system, with adjustable ignition timing.

Users can manually advance or retard the ignition timing according to operating conditions, allowing them to explore how ignition timing affects starting, throttle response, and overall engine operation.

This makes the model particularly interesting for hobbyists who enjoy not only watching an engine run, but also understanding the mechanical principles behind it.

Built for Engine Enthusiasts and Collectors

The 1115 Mini Engine brings together several elements that make miniature engine models so fascinating:

• 1/7-scale recreation of a classic 1115 engine
• 3.6cc single-cylinder four-stroke gasoline engine
• Cast brass and metal construction
• Mechanical piston oil pump
• Hopper-style evaporative water cooling
• Adjustable mechanical ignition timing
• Metal piston rings
• Electric drill starting system
• RTR configuration

The result is a compact working engine that combines mechanical education, hands-on operation, and vintage industrial aesthetics in one model.

Whether you're an experienced miniature-engine collector, a mechanical engineering enthusiast, or simply fascinated by the way traditional engines work, the 1115 Mini offers plenty of details to explore.

A New Addition to Your Engine Collection

There is something particularly satisfying about seeing a miniature engine come to life.

The movement of the piston, the rotation of the flywheel, the mechanical lubrication system, the cooling reservoir, and the adjustable ignition all work together to create an experience that feels much closer to operating a real engine than simply displaying a scale model.

At just over 14 cm long, the 1115 Mini is small enough for a desktop but detailed enough to become a conversation piece in any engine collection.

Limited-Time $100 OFF — Shipping in December

The RETROL & OKMO 1/7 Scale 1115 Mini Fixed Water-Cooled 4-Stroke Gas Engine is now available for preorder.

🔥 New Release Offer: $100 OFF

Limited-time $100 OFF

Shipping starts in December

If you've been looking for a compact working gasoline engine that combines classic agricultural-engine design with authentic mechanical systems, this is a great time to add the 1115 Mini to your collection.

Reserve yours now and experience the mechanical character of the classic 1115 engine in 1/7 scale.

[Shop the RETROL & OKMO 1115 Mini Gas Engine →]