CISON L4-205-OHV 20.5cc Inline 4 Cylinder Water Cooled Gasoline Engine Model
Hero Section: The Blue Era of High-Performance RC Power
The wait is over. The legendary L4 series has evolved. Introducing the CISON L4-205-OHV, a machine that doesn't just iterate on its predecessor—it completely outperforms it. Clad in a striking "Tech Blue" finish, this 20.5cc inline-four engine is a masterpiece of miniature engineering designed for those who demand raw power and high-RPM screaming performance. Whether you are looking to swap the heart of your 1/8 scale crawler or build a desktop test bench that sounds like a Formula racing car, the L4-205-OHV is the new benchmark for miniature internal combustion engines.
Why Choose the CISON L4-205-OHV?
- A Massive Power Surge (45% Increase): We didn't just paint it blue. By increasing the displacement to 20.5cc (up 17% from the L4-175), we have unlocked a staggering 3.6 horsepower. This isn't just a model; it's a torque monster capable of moving heavy 1/8 and 1/10 scale RC trucks, tractors, and boats with authority.
- 11,500 RPM Redline: While its predecessor was a cruiser, the L4-205 is a racer. The optimized OHV valve train and lightweight internals allow this engine to scream up to 11,500 RPM. The throttle response is instant, sharp, and exhilarating.
- The "Tech Blue" Aesthetic: Moving away from the classic red, the new anodized blue finish gives the engine a modern, high-tech industrial look. It stands out in any chassis or collection as a piece of precision art.
- Acoustic Perfection (4-into-1 Header): Included with the engine is a professionally designed 4-into-1 exhaust header. This isn't just for looks; it merges the exhaust pulses to create a smooth, deep, and resonant 4-cylinder exhaust note that mimics a full-sized performance car.
Technical Highlights: Engineering Deep Dive
- Improved Independent Lubrication: Longevity is key at 11,500 RPM. The L4-205 features an upgraded independent lubrication system with a dedicated oil sump. This ensures the crankshaft and connecting rods float on a film of oil, significantly reducing friction and heat compared to standard mixed-fuel lubrication.
- High-Efficiency Water Cooling: To manage the heat generated by 3.6 horsepower, the water-cooling jacket has been redesigned for better flow efficiency. When paired with a radiator (sold separately), it maintains stable operating temperatures even during extended high-load runs.
- Electronic Start & CDI: No more pulling cords. The engine comes equipped with a high-torque brushed starter motor and a reliable CDI (Capacitor Discharge Ignition) system, ensuring easy, one-button starts every time.
- Broad Compatibility: The compact dimensions (13.5 x 10.2 x 10.5 cm) combined with the power upgrade make it a versatile drop-in option for a wide range of 1/8 and 1/10 scale RC applications.
Specifications
- Brand: CISON
- Model: L4-205-OHV
- Type: Inline 4-Cylinder 4-Stroke Gasoline Engine
- Displacement: 20.5cc
- Bore: 18.5mm
- Stroke: 19mm
- Valve Mechanism: OHV (Overhead Valve)
- RPM Range: 1800 - 11500 rpm
- Power Output: Approx. 3.6 PS
- Cooling: Water-Cooled
- Lubrication: Independent Sump System
- Ignition: CDI Electronic Ignition
- Starting: Electric Starter
- Fuel: 92# Gasoline or higher
- Oil: 10W50 2T or 4T Engine Oil
- Dimensions: 13.5 x 10.2 x 10.5 cm
- Weight: 1300g
Usage Scenario: The Sound of Speed
Imagine mounting this engine on your test stand. You connect the fuel lines and the 12V battery. You press the start button. The starter whirs for a split second before the four cylinders catch fire. The idle is a steady, rhythmic purr. But then, you snap the throttle open. The RPMs rocket to 11,000, and the 4-into-1 exhaust emits a high-pitched wail that sends shivers down your spine. This is the closest you can get to owning a racing engine on your desk.
Important Tips from the Workshop
- What You Need to Run: This is a professional engine kit. The package includes the engine, exhaust, and starter motor. To run it, you must separately purchase: A 12V Lithium Battery, Fuel Tank, Fuel Lines, Radiator/Water Pump Kit, and Spark Plugs.
- Oil Maintenance: Because this engine uses an independent lubrication system, you must fill the oil sump with high-quality 10W50 oil before starting. Check the oil level regularly (every 10-15 hours of runtime) to prevent internal damage.
- Break-in is Crucial: With a new high-compression design, the first few tanks of fuel should be run at moderate RPMs to allow the piston rings to seat properly against the cylinder walls.
- Safety: This engine produces real exhaust fumes and heat. Always operate in a well-ventilated area.
Customer Support
We are dedicated to supporting your high-performance build. If you need assistance with installation, tuning, or finding the correct accessories, please contact our expert team at service@helloworld7.com.
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