Water pump aluminum/iron

[chaseincats]

Looking at getting a new water pump but I've heard getting one with a cast aluminum impeller is the way to go as it does not erode in the coolant.

I checked rock auto but none of them specify which material the impeller is made of.  Any recommendations on a pump?

[Zed Head]

You might be thinking of stamped steel versus cast iron.  I've never seen an aluminum impeller.  

Compare the AISIN and Airtex pictures to the others. I think that most people like the cast impellers.  They were hard to find for a few years but it looks like they're back.

https://www.rockauto.com/en/catalog/nissan,1978,280z,2.8l+l6,1209260,cooling+system,water+pump,2208

 

[chaseincats]

so Aisin would be the way to go and shouldn't rust?

[Zed Head]

Your antifreeze should contain corrosion-inhibiting chemicals.  The block itself will rust if you don't use proper antifreeze, it's cast iron.

[siteunseen]

Don't forget the washers on the pumps. Lock washer against the bolt head then flat washer against the aluminum pump.

[dutchzcarguy]

16 hours ago, Zed Head said:

most people like the cast impellers.

Yes!..  the best pump, not that cheap sheet metal impeller.

[S30Driver]

Go with the Aisin WPN013, cast impeller, its a very good pump.  Its available from Rock Auto or Amazon.   About $25