This heavy-duty cast iron flywheel pulley is a specialized power-transmission component engineered for high-output, industrial reciprocating air compressor pumps—most notably the W3090 (3-cylinder) and V2090 (2-cylinder) platforms.
When paired with a 13HP gasoline engine like the Honda GX390, this flywheel acts as the vital mechanical link that translates the engine's high-speed rotation into high-torque compressing power while keeping the pump head safely cooled.
Key Design & Structural Features
* Integrated Forced-Air Cooling Blades: The 10-spoke structural design features aerodynamically pitched, wedge-shaped blades. When spinning, the pulley operates as a highly efficient cooling fan, blowing high-velocity ambient air directly over the compressor cylinders and intercooler tubes to prevent thermal overheating.
* Dual-Groove V-Belt Track: Fully machined with a dual-groove configuration tailored for two standard B-Section V-belts (17mm width). The dual-belt layout distributes high mechanical loads evenly and eliminates belt slippage during maximum tank pressurization cycles.
* Precision Tapered Center Hub: The center core features a standardized tapered shaft bore (typically measuring roughly 30mm to 34mm across the taper) with an integrated keyway slot. This ensures a true, wobble-free interference fit directly onto the compressor pump crankshaft.
* High-Mass Cast Iron Composition: Cast from industrial-grade gray iron, the pulley carries significant rotational mass. This acts as a dampening flywheel, smoothing out the severe compression pulses inherent in multi-cylinder, high-pressure reciprocating pump strokes.
Technical Specifications
Parameter
- Outside Diameter (OD) - 350mm to 360mm (Approx. 14 inches)
- Belt Section Profile - Dual B-groove (Fits two 17mm wide V-belts)
- Center Bore Type - Tapered shaft with machined 5mm or 6mm keyway
- Compatible Pump Heads - W3090, V2090, 3090 (7.5HP to 10HP rated compressor pumps)
- Target Pump Speed - 800 RPM – 1,100 RPM maximum
