VORTRIXE & OKMO 3.6cc Brass Model 1115 Miniature Water-Cooled 4-Stroke Gasoline Engine with Adjustable Timing Pre-Order

VORTRIXE & OKMO 3.6cc Brass Model 1115 Miniature Water-Cooled 4-Stroke Gasoline Engine with Adjustable Timing Pre-Order

The OKMO 1115 is currently available for pre-sale. Be among the first to own this precision tribute to the legendary 1115 agricultural diesel and enjoy an exclusive $100 discount off the regular launch price.

Regular Price: $679.99
Pre-Sale Price: $579.99(Auto-applied at checkout)
Pre-Sale Period: Now through 2026.12.1
Estimated Shipping: 2026.12.6 (We'll notify you via email with tracking details)
Note: No cancellations after production starts — reserve your slot early to guarantee delivery.

Introduction & Historical Hook

The OKMO 1115 Miniature Gasoline Engine is a precision-crafted homage to the legendary Chinese 1115 agricultural diesel — the single-cylinder workhorse that powered a generation of walking tractors, irrigation pumps, and rural machinery across Asia. While this model runs on gasoline with spark ignition, every external detail and mechanical philosophy is borrowed from the 1115 diesel: from the cast brass body to the stainless steel flywheel, it echoes the rugged simplicity that made the full-size 1115 a symbol of mechanical reliability. Scaled to 140×110×115mm with a 16mm bore and 19mm stroke, this 3.6cc desktop model is built for collectors, engineers, and hands-on enthusiasts who appreciate vintage industrial design.

Materials & Build Quality

At the heart of the OKMO 1115 lies a cast brass engine body, chosen to replicate the thermal mass and vintage industrial aesthetic of a cast-iron diesel block. Brass offers excellent corrosion resistance and heat dissipation, making it ideal for prolonged running sessions on your workbench. The large stainless steel flywheel mirrors the inertial smoothing role of a real 1115 — delivering steady idle, easier starting, and authentic low-RPM character that single-cylinder engines are known for. Unlike toy-grade models, this is a full-metal, fully operational mechanical system built to last.

Functional Systems — Evaporative Cooling, Oil Piston Pump Lubrication & Single-Wire Ignition

What sets the OKMO 1115 apart from static display models is its authentic engine-driven oil piston pump lubrication system. True to the original 1115 diesel design, this piston-type oil pump circulates lubricant to critical moving parts, ensuring smooth operation, reducing wear, and extending engine life. It's a fully functional mechanical system that mirrors how full-size agricultural engines handle internal lubrication — no electric pumps, just pure mechanical drive.

For cooling, the engine uses an authentic evaporative water-cooling system (hopper style) — exactly as the original 1115 did in the field. Heat is dissipated through natural evaporation, and the water tank is fitted with a convenient faucet drain valve, allowing you to quickly and cleanly drain coolant without any disassembly or tools.

Ignition has been upgraded to a single-wire system — a cleaner, more reliable design compared to the dual-wire versions shown in earlier product photos. This mechanical spark ignition, combined with variable, micro-adjustable timing, lets you manually advance or retard the spark point to fine-tune starting, responsiveness, and smoothness — exactly as a field mechanic would adjust timing on a classic engine.

The engine is also equipped with metal piston rings, providing superior compression, excellent heat transfer, and long-term durability that closely replicates the feel and performance of a real engine.

The Operating Experience

The OKMO 1115 is designed for people who enjoy operating rather than just displaying. A typical session begins with filling the hopper-style water tank, checking the oil level for the piston pump, setting timing to a middle position, and starting by hand. From there, you fine-tune the advance/retard while listening to RPM stability and watching the stainless flywheel smooth each power stroke. The metal piston rings deliver that satisfying compression feel, while the oil piston pump silently keeps everything lubricated. When you're done, simply open the faucet valve to drain the coolant — no mess, no disassembly. It's a ritual that connects you directly to the golden age of mechanical engineering — no software, no sensors, just gears, levers, and combustion.

Why Choose the OKMO 1115?

- Single-wire ignition upgrade — cleaner installation and improved reliability over the dual-wire design shown in earlier photos
- Faucet drain valve on water tank — effortless coolant draining without tools or disassembly
- Authentic evaporative (hopper) cooling — matches the original 1115 diesel design; no pump required, just like the real thing
- Engine-driven oil piston pump lubrication — true to the original 1115, ensures reliable operation and longevity
- Equipped with metal piston rings — superior compression, durability, and authentic engine performance
- Premium materials — cast brass and stainless steel for durability, thermal performance, and vintage aesthetics
- Educational value — study single-cylinder engine principles, lubrication systems, and ignition timing on a safe, desktop scale
- Collector-grade finish — display-worthy craftsmanship that looks as good on a shelf as it performs on a bench