CISON FL4-175 17.5cc Flathead Inline 4 Cylinder 4 Stroke RC Gasoline Engine Model Kit
Hero Section: The Heart of a Vintage Beast
History isn't just found in books; it's forged in metal. The CISON FL4-175 brings the legendary "Flathead" (Sidevalve) era back to life. Inspired by the automotive workhorses of the 1930s and 40s, this engine isn't just a power source; it is a kinetic tribute to the golden age of mechanics. Whether you are building a 1/8 scale vintage crawler to dominate the trails or seeking a desktop masterpiece that smells of gasoline and glory, the FL4-175 delivers an experience that is raw, mechanical, and utterly authentic.
Why Choose the CISON FL4-175?
- Rare Flathead (Sidevalve) Design: Most RC engines use modern overhead valves. The FL4-175 stays true to history with a valve-in-block design. This not only gives it a lower center of gravity—crucial for RC crawlers—but also creates a compact, retro profile that looks incredible in a chassis.
- The "Torque Monster": Speed isn't everything. Thanks to its long-stroke design (20mm), this engine generates immense low-end torque. It doesn't just scream; it pulls. This makes it the perfect "heart" for 1/8 and 1/10 scale trucks and crawlers that need power to climb, not just race.
- Precision Meets Durability: The main body is CNC-machined from aluminum for precision, while the cylinder liners are hardened for durability. With bi-metal piston rings made of cast iron, this engine is built to run, offering excellent compression and longevity.
- The Builder’s Journey: As an assembly version, this engine offers the ultimate satisfaction. You aren't just buying a toy; you are building a machine. It’s the perfect project to share with a son or a friend, turning a weekend into a lesson in engineering and patience.
Technical Highlights: Engineering Simplified
- Hybrid Lubrication System: To ensure longevity, the FL4-175 uses a smart lubrication strategy. It features an independent lubrication system for the crankshaft (via the oil pan) and requires mixed fuel (gasoline + oil) to lubricate the upper cylinder and valves. It even supports an external oil pump for those who want to upgrade.
- Water-Cooled Endurance: Unlike air-cooled engines that fade under load, the water-cooling cycle allows this engine to maintain peak performance during long run times.
- Electronic Ignition (CDI): While the mechanics are vintage, the spark is modern. The custom-developed 4-cylinder CDI ensures stable ignition and strong anti-interference, making it friendly for use with sensitive RC radio equipment.
- Tunable Performance: Featuring a single carburetor and stainless steel intake/exhaust pipes, the engine is designed for easy calibration. You can tune it for a reliable idle or a responsive throttle, accompanied by a deep, throaty exhaust note.
Specifications
- Brand: CISON
- Model: FL4-175
- Type: Flathead (Sidevalve) Inline 4-Cylinder 4-Stroke
- Form: Assembly Version (Kit)
- Displacement: 17.5cc
- Bore: 16.7mm
- Stroke: 20.0mm
- Power: 2.5PS
- RPM Range: 1600 - 9000 rpm (High Torque Focus)
- Cooling: Water-Cooled
- Ignition: CISON 4-Cylinder CDI
- Power Supply: 6-12V (2S-3S LiPo recommended)
- Fuel: Gasoline (Mixed with 2T Oil)
- Dimensions: 13.5 x 4.3 x 9cm
- Weight: 1500g
Usage Scenario: The Trail Climb
Picture this: You’ve installed the FL4-175 into your custom 1/8 scale Willys Jeep or Land Rover chassis. You hit the starter, and the engine settles into a low, rhythmic idle unique to flatheads. You approach a steep rocky incline. Instead of revving the engine to the moon, you gently apply throttle. The long-stroke torque kicks in, and the vehicle powers up the slope with authority and realism. This is what scale modeling is all about.
Important Tips from the Workshop
- Lubrication is Critical: This engine requires a dual approach. You must add a small amount of oil to the crankcase (splash lubrication) AND mix high-quality 2T oil into your gasoline (for the valves and piston). Failure to do both will damage the engine.
- Cooling System: Do not run this engine without a water circulation system (pump and radiator). The water jacket is designed to remove heat efficiently, but it needs flow.
- Break-in: Since this uses cast iron piston rings, the break-in period is vital. Run the engine rich and at varied low-to-mid RPMs for the first few tanks to ensure the rings seat perfectly against the hardened liner.
- Battery Selection: We recommend a 2S or 3S LiPo battery (7.4V - 11.1V) for the ignition and starter to ensure reliable starts.
Customer Support
Building and tuning a 4-cylinder kit is a rewarding challenge. If you need guidance on assembly, tuning, or compatible parts, our expert team is ready to assist. Contact us at service@helloworld7.com.
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