CISON L4-205-OHV 20.5cc Inline 4 Cylinder 4 Stroke Water Cooled Gas Engine for RC Models
Hero Section: The Scream of 11,500 RPM
There is a specific sound that defines high performance—the high-pitched, synchronized roar of an inline-four engine climbing the rev range. The CISON L4-205-OHV isn't just an upgrade; it is a complete evolution of the miniature engine. Clad in a striking "Tech Blue" finish, this 20.5cc powerhouse is built for those who demand more than just movement—they demand dominance. Whether you are upgrading a 1/8 scale RC crawler, building a high-speed model boat, or simply want to own a masterpiece of mechanical engineering, the L4-205 delivers a visceral experience of speed, sound, and precision.
Why Choose the CISON L4-205-OHV?
- Raw Power Upgrade: This is the "Big Block" of the mini world. With a displacement increased to 20.5cc (up 17% from the previous generation), it delivers a staggering 3.6 horsepower. It doesn't just run; it screams up to 11,500 RPM, offering a significant torque boost for heavy RC builds.
- The "Tech Blue" Aesthetic: Moving away from the traditional red, the L4-205 features a sleek, anodized blue finish. It looks modern, cold, and professional—like a high-performance racing engine should. It is a visual centerpiece that demands attention on any workbench or chassis.
- Endurance Engineering: Heat is the enemy of performance. This engine features a highly efficient water-cooling system and an improved independent lubrication system. This means you can run it harder and longer without the fear of overheating or oil starvation that plagues lesser models.
- The Ultimate Builder's Challenge: Installing and tuning a multi-cylinder engine is a rite of passage. This engine offers the perfect opportunity for fathers and sons or friends to bond over the complexity of timing, tuning, and plumbing a real gas engine.
Technical Highlights: Under the Hood
- True OHV Architecture: The Overhead Valve (OHV) design isn't just for show. It ensures precise valve timing and efficient intake/exhaust cycles, contributing to that high RPM ceiling and realistic throttle response.
- 4-in-1 Exhaust Note: The engine comes with a 4-into-1 exhaust header. This design merges the exhaust pulses from all four cylinders, creating a smooth, continuous exhaust note that mimics full-sized racing engines.
- CDI Electronic Ignition: Forget the frustration of finicky starts. The modern CDI (Capacitor Discharge Ignition) system ensures a strong, consistent spark at all RPMs, making starting easier and idling smoother.
- Forged for Strength: With a slightly shorter stroke (19mm) and a larger bore (18.5mm), the internal geometry is optimized for high-speed stability, reducing vibration and wear on the crankshaft.
Specifications
- Model: CISON L4-205-OHV
- Type: Inline 4-Cylinder, 4-Stroke, Water-Cooled
- Displacement: 20.5cc
- Bore: 18.5mm
- Stroke: 19mm
- RPM Range: 1800 - 11500 RPM
- Power Output: ~3.6 PS
- Fuel: 92# Gasoline or higher
- Lubrication: Independent (Oil Pan)
- Oil Type: 2T or 4T Engine Oil (10W50 Recommended)
- Dimensions: 13.5 x 10.2 x 10.5 cm
- Weight: 1300g
- Starting Method: Electric Starter (CDI Ignition)
Usage Scenario: The Trackside Legend
Imagine the scene: You are at the local RC meet or the lake. While others are plugging in silent batteries, you are fueling up. You press the starter button. The L4-205 coughs once, then settles into a menacing, low idle. You blip the throttle, and the engine instantly responds with a fierce growl, revving freely to 11,000+ RPM. Heads turn. People gather. You aren't just driving a toy; you are piloting a mechanical beast. This is the engine that turns a standard model into a legend.
Important Tips from the Workshop
- The Lifeblood of the Engine: This engine requires an oil mix. We strongly recommend using high-quality 10W50 oil. Change the oil after the first 10-15 hours of operation to remove any metal particles from the break-in process.
- Cooling is Mandatory: Never run this engine without the water cooling system connected and flowing. The high power output generates significant heat, and running dry will damage the cylinder seals rapidly.
- Battery Requirement: The starter and CDI require a power source. A 12V Lithium battery is recommended (sold separately) to provide enough cranking amps for the high-compression cylinders.
- Break-in Period: Treat this like a real car engine. For the first few tanks of fuel, avoid holding it at maximum RPM. Vary the throttle to allow the piston rings to seat perfectly against the cylinder walls.
Customer Support
We are engine builders, just like you. If you need advice on mounting this beast to your chassis, tuning the carburetor, or sourcing spare parts, contact our technical team at service@helloworld7.com.
Delivery
Free Return & Exchange
Our 60-Day Fit Guarantee, Free Exchange & No-Hassle Returns
Shipping from US facilities
Your purchase makes a difference
