CISON L4-175 OHV 17.5cc Miniature 4 Cylinder 4 Stroke Water Cooled Gasoline Engine for RC
Hero Section: The Evolution of Miniature Power
If the Flathead engine was a tribute to history, the CISON L4-175 OHV is a testament to performance. Building upon the legacy of the FL4-175, this upgraded Overhead Valve (OHV) version is designed for those who demand more. More torque, more precision, and a more aggressive look. With its striking red sport elements and bionic carburetor design, this isn't just a static model—it is a high-performance "heart" ready to breathe life into your 1/8 scale RC crawlers, tractors, or custom marine builds. Experience the mechanical purity of a 4-cylinder engine that looks, sounds, and performs like a racing machine shrunk down to the palm of your hand.
Why Choose the CISON L4-175 OHV?
- OHV Performance Upgrade: Unlike the previous side-valve design, the Overhead Valve (OHV) structure optimizes airflow and compression. This results in significantly higher torque output, making it the ideal powerhouse for RC off-road trucks and heavy-duty towing models that need grunt at low RPMs.
- True Independent Lubrication: Say goodbye to the unreliability of simple mixed-fuel lubrication. The L4-175 features a genuine independent lubrication system with an external oil pump and mini oil filter compatibility. This ensures the crankshaft and internals are protected, just like in a full-sized car engine.
- Bionic Carburetor Technology: We’ve redesigned the intake system with a "bionic" carburetor. This innovation allows for easier tuning and a much more sensitive throttle response, eliminating lag and delivering a deep, throaty roar when you open the throttle.
- Rugged Beauty: The engine block is CNC-machined from aluminum with a sandblasted oxidation finish, accented by sport-red details. It features a stiffened crankshaft and bimetal cast iron piston rings, ensuring that it is as durable as it is beautiful.
Technical Highlights: Engineering Deep Dive
- Water-Cooled Endurance: High torque generates heat. The integrated water-cooling cycle (requires external pump/radiator) ensures the engine stays within optimal operating temperatures, allowing for extended run times without power fade.
- Precision Internals: The engine utilizes a 4-stroke, 4-cylinder layout with a 17.5cc displacement. The long stroke (14mm) vs. bore (16.7mm) ratio is specifically calculated to maximize low-end torque.
- Electronic Ignition Ready: Designed for reliability, the engine is compatible with a dedicated 4-cylinder CDI (Capacitor Discharge Ignition) system. This provides a stable spark at all RPMs and features anti-interference shielding to protect your RC radio gear.
- Compact Footprint: Despite its complexity, the L4-175 maintains a mini form factor, making it easier to fit into the engine bays of 1/8 and 1/14 scale models without extensive chassis modification.
Specifications
- Brand: CISON
- Model: L4-175 OHV
- Type: Gasoline Internal Combustion Engine
- Form: Finished Version (Pre-assembled Engine Block)
- Valve Mechanism: OHV (Overhead Valve)
- Displacement: 17.5cc (4 Cylinders)
- Bore: 16.7mm
- Stroke: 14mm
- RPM Range: 1500 - 8000 rpm
- Power: Approx. 2.5ps
- Cooling: Water-Cooled
- Lubrication: Independent System (Oil Pump)
- Fuel: 92# Gasoline or higher
- Engine Oil: 10W50 2T Engine Oil recommended
- Dimensions: 13.5 x 10.24 x 10.5cm
- Weight: 1300g
Usage Scenario: The Ultimate RC Upgrade
Imagine your 1/8 scale crawler sitting at the bottom of a rocky trail. You flip the switch on your transmitter. The CISON L4-175 fires up instantly via the electric starter, settling into a steady, rhythmic idle. As you ease onto the throttle, the OHV system delivers immediate torque, propelling the truck up the incline with a realistic exhaust note that turns heads. This is the difference between a toy and a machine.
Important Tips from the Workshop
- "Bare Engine" Configuration: Please be aware that this product is sold as a Finished Engine Block. To run it, you must separately purchase or prepare: A CDI Igniter, 4x Spark Plugs (1/4-32 ME8), a Water Cooling Kit (Radiator/Pump), a Fuel Tank, and a Battery (12V LiPo recommended).
- Lubrication is Vital: Because this engine uses an independent lubrication system, you must fill the oil reservoir with high-quality 10W50 oil before operation. Do not run it dry.
- Break-in Period: Although pre-assembled, the bimetal piston rings need time to seat. Run the engine at moderate RPMs for the first few tanks of fuel to ensure peak compression and longevity.
- Safety: Always operate in a well-ventilated area.
Customer Support
We are dedicated to helping you build your dream machine. If you need assistance selecting the correct accessories (CDI, Spark Plugs) or need tuning advice, please contact our expert team at service@helloworld7.com.
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