CISON L4-175 17.5cc OHV 4 Stroke Gasoline Engine for RC Crawlers and Tractors
Hero Section: The Heart of a Beast
If the engine is the soul of a machine, the CISON L4-175 is a soul forged in fire and precision. Building upon the legacy of the classic F-head FL4-175, this upgraded OHV (Overhead Valve) version is not just a model—it is a torque monster designed for the serious RC builder. With its aggressive red sport styling and a mechanical architecture that prioritizes low-end grunt, this 17.5cc inline-four gasoline engine transforms 1/8 and 1/14 scale crawlers into realistic, earth-moving machines. It’s time to stop playing with toys and start engineering with power.
Why Choose the CISON L4-175 OHV?
- OHV Power Upgrade: Unlike the previous F-head design, the new Overhead Valve (OHV) structure optimizes airflow and compression. The result? Significantly higher torque output. This makes it the ideal power plant for heavy RC off-road trucks, tow trucks, and excavators that need real pulling power, not just high RPM noise.
- Independent Lubrication System: Most micro engines rely on mixed fuel for lubrication, which shortens their life. The L4-175 features a true independent lubrication system with a mini oil pump. This ensures the crankshaft and pistons are bathed in oil, just like a real car engine, guaranteeing durability for long run times.
- Bionic Carburetor Design: We’ve redesigned the intake system. The new "bionic" carburetor offers a more sensitive throttle response. Whether you are crawling over rocks at low speeds or opening it up on the flats, the engine responds instantly with a deep, throaty roar.
- A Masterpiece of CNC Metal: Every curve and bolt screams quality. The main body is precision-machined from CNC aluminum, featuring a stiffened cylinder liner and a bimetal cast iron piston ring. The sandblasted, oxidized surface with red accents gives it a premium, "race-ready" aesthetic.
Technical Highlights: Engineering Deep Dive
- Water-Cooled Endurance: To handle the heat of high-torque operation, the engine features a built-in water circulation channel. When paired with a radiator (sold separately), it maintains optimal operating temperatures even under load.
- Reinforced Crankshaft: The integral stiffening crankshaft has been treated for maximum rigidity. It translates the explosive force of the 17.5cc displacement into smooth, rotational energy without flexing.
- CDI Electronic Ignition: Designed for reliability, the engine uses a compact CDI (Capacitor Discharge Ignition) system. It provides a strong, stable spark that resists interference, ensuring your RC electronics remain glitch-free.
- Long Stroke Geometry: With a 14mm stroke and 16.7mm bore, the engine geometry is biased towards torque, mimicking the characteristics of full-sized industrial engines.
Specifications
- Brand: CISON
- Model: L4-175 OHV
- Type: Inline 4-Cylinder, 4-Stroke Gasoline Engine
- Displacement: 17.5cc
- Valve Mechanism: OHV (Overhead Valve)
- Bore: 16.7mm
- Stroke: 14mm
- RPM Range: 1500 - 8000 RPM
- Power Output: Approx. 2.5ps
- Cooling: Water-Cooled
- Lubrication: Independent Oil Pump System
- Fuel: 92# Gasoline or higher
- Oil: 10W50 Engine Oil (2T)
- Dimensions: 13.5 x 10.24 x 10.5cm
- Weight: 1300g
Usage Scenario: The Ultimate Upgrade
Imagine your 1/8 scale heavy hauler sitting on the workbench. You remove the generic electric motor and drop in the CISON L4-175. You fill the tank, prime the oil pump, and hit the electric start. The engine catches with a rhythmic, heavy idle. As you gently squeeze the throttle, the truck doesn't just move; it lurches forward with authority, the exhaust puffing smoke, the sound echoing off the walls. This is the realism you’ve been chasing.
Important Tips from the Workshop
- Accessories Required: Please note this is the Engine Only. To run it, you will need to separately purchase/prepare: Spark Plugs (1/4-32 ME8), CDI Igniter, Water Cooling Radiator/Pump, Fuel Tank, and a 12V Battery.
- Oil is Critical: Because this engine has an independent lubrication system, you must fill the oil reservoir with 10W50 engine oil before starting. Running it dry will cause immediate damage.
- Break-in Period: A new engine needs patience. Run it at low-to-mid RPMs for the first few tanks of fuel to allow the bimetal piston rings to seat perfectly against the cylinder liner.
Customer Support
Installing a gasoline engine into an RC model is a complex, rewarding project. If you need guidance on wiring the CDI, setting up the cooling loop, or tuning the carburetor, contact our expert team at service@helloworld7.com.
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