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[GMCnet] Or GMC engine water pump. Versus the car. [message #324528]

Mon, 02 October 2017 00:16

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Our pump has 6 impellers. The car one has 5? Right? Been a long time. And there's a pump that has a better bearing. Bob Dunahugh 78 Royale
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Re: [GMCnet] Or GMC engine water pump. Versus the car. [message #324529 is a reply to message #324528]

Mon, 02 October 2017 01:17

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

There at at least 3 different types and a bunch of different sizes (diameters) all used in the same casting. The same casting was used on many different engines. As far as the number of vanes on the impeller I have never paid much attention. I sure that the cast impeller has more than 5, 6, or 7 vanes.

The GMC 455 came with a cast impeller at 4.25 inch diameter (I believe). I have one in my hangar and I'll try to remember to look at it tomorrow.

I believe the larger impeller was used on engines that needed more coolant flow. A lot of people have installed smaller impeller pumps and do not seem to have a problem with them other than initially getting all of the air out of the system.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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