Miatapower List Archive

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Mail From: Jason C <(email redacted)>

pages.sbcglobal.net/jcuadra/water%20pump/

The casting of the factory pump is cleaner, npw has more casting flash.

The factory pump has a closed back stamped impeller, with 6 straight
short "blades". The NPW has a closed back cast pump also with 6, but
longer, blades, curved, and their angle of attack is shallower. The
tips of each "blade" curves outward at a steeper angle of attack.

The clearance of the factory pump's blades is 1.5 mm, for the NPW is 1.0 mm.

I would imagine that the NPW would be more efficient, and the shallower
angle of attack means it may have less cavitation at high RPMs.

Cheers.

This read-only message was archived from a public mail list.
Mail From: "Robert Mangas" <(email redacted)>


Good eye on the clearance. Is the overall impeller height the same? Hard
to tell from the pictures...

Thanks,
Robert

>From: Jason C <(email redacted)>
>To: "(email redacted)" <(email redacted)>
>Subject: pictures of factory water pump vs. npw pump
>Date: Wed, 21 Apr 2004 22:35:47 -0700
>
>pages.sbcglobal.net/jcuadra/water%20pump/
>
>The casting of the factory pump is cleaner, npw has more casting flash.
>
>The factory pump has a closed back stamped impeller, with 6 straight short
>"blades". The NPW has a closed back cast pump also with 6, but longer,
>blades, curved, and their angle of attack is shallower. The tips of each
>"blade" curves outward at a steeper angle of attack.
>
>The clearance of the factory pump's blades is 1.5 mm, for the NPW is 1.0
>mm.
>
>I would imagine that the NPW would be more efficient, and the shallower
>angle of attack means it may have less cavitation at high RPMs.
>
>Cheers.

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