CISON FL4-175 17.5cc Flathead Inline 4 Cylinder 4 Stroke Gasoline Engine Model
Hero Section: The Golden Age of Mechanics, Reborn
Before the complexity of overhead cams, the world was powered by the "Flathead." The CISON FL4-175 is a magnificent tribute to that era (1890s-1950s), bringing the legendary Side-Valve architecture to the world of miniature engineering. This isn't just an engine; it is a time machine. With its low profile, distinctive "flat" top, and the rhythmic, low-frequency rumble that only a side-valve engine can produce, the FL4-175 offers a mechanical soul that modern engines simply cannot replicate. Whether you are restoring a vintage 1/8 scale RC truck or building a desktop test bench, this engine delivers raw, nostalgic power.
Why Choose the CISON FL4-175?
- Unique Flathead (Side-Valve) Design: In a market flooded with modern OHV models, the FL4-175 stands out. By placing the valves within the engine block, it achieves a lower center of gravity and a compact profile. It’s a rare, retro aesthetic that captures the spirit of early automotive history.
- Torque Over Speed: Designed with a long stroke (20mm), this engine is a "stump puller." It prioritizes high torque at lower RPMs, making it the perfect heart for 1/8 and 1/10 scale RC crawlers, tractors, and tow trucks that require immense pulling power rather than just high speed.
- Engineering Transparency: The oil pan is designed with a reserved space for modification. Skilled builders can replace it with a transparent window to observe the crankshaft splashing oil in real-time—a mesmerizing visual for any gearhead.
- Built for Customization: The flywheel end is pre-engineered to accept a simulated mechanical manual clutch (upgrade option). This level of expandability makes it a dream project for DIY enthusiasts looking to build a fully functional miniature powertrain.
Technical Highlights: Precision Meets Durability
- Hybrid Lubrication System: To ensure longevity, the FL4-175 utilizes a dual-lubrication method. An external oil pump circulates oil to critical components, while the crankshaft splash lubricates the cylinder walls. Note: It also requires a small amount of castor oil in the fuel for upper-cylinder protection.
- Water-Cooled Reliability: Unlike air-cooled models that fade under load, this engine features a fully integrated water-cooling cycle. This allows for extended run times without overheating, maintaining peak performance during long RC sessions.
- CNC Metal Construction: The main body is precision-machined from aluminum, while the piston rings are made from bimetal cast iron for superior sealing. The cylinder liner is hardened to withstand the friction of thousands of cycles.
- Electronic Ignition (CDI): Despite its vintage look, the spark is modern. The custom-developed 4-cylinder CDI system ensures stable ignition and strong anti-interference, making it safe to use alongside sensitive RC radio equipment.
Specifications
- Brand: CISON
- Model: FL4-175
- Type: Inline 4-Cylinder Flathead (Side-Valve) Gasoline Engine
- Form: Assembly Version (Kit)
- Displacement: 17.5cc
- Bore: 16.7mm
- Stroke: 20.0mm
- RPM Range: 1600 - 9000 RPM
- Power Output: 2.5PS
- Cooling: Water-Cooled
- Lubrication: Independent Pump + Splash
- Fuel: Gasoline (Requires Mixed Oil)
- Dimensions: 13.5 x 4.3 x 9cm
- Weight: 1500g
Usage Scenario: The Vintage Truck Build
You have a 1/8 scale chassis of a 1940s pickup truck. A modern electric motor would feel wrong. You install the CISON FL4-175. You connect the water lines, prime the fuel, and hit the starter. The engine catches with a deep, throaty chug-chug-chug idle. As you ease onto the throttle, the long-stroke torque moves the heavy chassis effortlessly over obstacles. It smells like a garage, sounds like history, and drives like a dream.
Important Tips from the Workshop
- What's Included: This listing is for the Engine Kit. You will need to separately purchase/prepare: Base, CDI Igniter, Spark Plugs, Battery (2S-3S LiPo), Oil Filter, and Water Cooling Accessories.
- Lubrication is Key: This engine requires attention to oil. You must add oil to the crankcase for the bottom end AND mix castor oil into your gasoline for the top end. Failure to do both will result in seizure.
- Break-in: The bimetal piston rings require a break-in period. Run the engine rich and at varied low-to-mid RPMs for the first few tanks to ensure a perfect seal.
Customer Support
Building and tuning a multi-cylinder gasoline engine is a rewarding challenge. If you need advice on the correct fuel mixture, wiring the CDI, or sourcing compatible accessories, please contact our expert team at service@helloworld7.com.
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