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Message: [QUOTE="rentstdi, post: 282091, member: 678"] The main reason oem manufacturers used "plastic" impellers is to stop/prevent cavitation from the SCA/DCA levels in the coolantbeing out of range. Since the coolant technology has changed over the last few years there isn't much cavitation happening at the waterpump. Manufacturures are starting to go back to back to metal impellers, but see it still cheaper for them to make plastic impellers... cav·i·ta·tion (kv-tshn) n. 1. The sudden formation and collapse of low-pressure bubbles in liquids by means of mechanical forces, such as those resulting from rotation of a marine propeller. 2. The pitting of a solid surface. 3. Medicine The formation of cavities in a body tissue or an organ, especially those formed in the lung as a result of tuberculosis. [/QUOTE]

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