WOSP High-sided Aluminium Water Pump Pulley - BMC A-series / Classic Mini / MG Midget

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Upgrade your cooling system with this precision-machined aluminium pulley. Engineered for high-performance A-Series engines, the high-sided design ensures your fan belt stays exactly where it belongs, even at maximum RPM.

Product Specs

• Material: Lightweight, high-grade aluminium
• Design: High-sided flanges to prevent belt "throwing" or turning
• Compatibility: All BMC A-Series engines (Classic Mini, MG Midget, etc.)
• Options: Available in 100mm and 120mm diameters

Size Selection Guide

• 100mm (Standard): Matches earlier carburettor cars. The ideal choice for fast road applications.
• 120mm (Oversized): Matches late fuel-injected Minis. Best for race engines, as the larger diameter slows the water pump speed to prevent cavitation at high RPM.

Why Choose This Pulley?

• Belt Security: The extra-tall sides provide a mechanical safeguard against belt slip during rapid deceleration or high-speed gear changes
• Reduced Parasitic Loss: Lightweight aluminium construction reduces rotational mass compared to heavy steel pulleys.
• Race-Proven: The 120mm option is a "must-have" for competition engines to keep coolant flow stable and efficient under racing conditions.

Note: Please select your preferred diameter from the dropdown menu to match your engine spec or intended use

[Lightweight, high sided aluminium water pump pulley for BMC A-series engines. The high sides and are designed to further eliminate the chance of turning or throwing a fan belt at high RPM.]

[Available in two sizes.]

[100mm as per earlier carburettor cars. Best for road cars.]

[120mm as per the late fuel injected Mini. Best suited for late Mini or for RACE cars where the larger diameter will help reduce water pump speed.]

[Suitable for any BMC A-series engine including Classic Mini and MG Midget.]