Blue impellor
 

Has anyone tried one of these blue impellors? do they really last if you run them dry for a while?
MD

Yep good stuff

But if your cooling system is marginal they will not pump as much as a black one-in some boats they cause overheating. Best bet is to try one and see(not during a race) :p

Randy, I have them in my boat and they work fine dry. BUT... I have bronze housings not FRP.

Is there any reason someone hasnt CNCe'd the housings yet? I would think they would sell like hot cakes. Get rid of the plastic that cracks and burns groves and go with a life time housing and just replace the cheap impellors.
Great idea for someone with a CNC machine.
MD

Randy, Jabsco makes a bronz replacement pump (Merc Replacement) like the crank driven pump that I use and I have run it dry several times and have gotten sand in it and it and it still works, the plastic housing has no forgivness.

http://www.go2marine.com/product.do?no=75699F

trick marine makes billet housings that they claim can be run dry

Hey Bill...ya really think Randy is gonna spend that much...come on now !! ONLT KIDDEN RANDY !! LMFAOOOOOOOOOOOOOOOOOOOOOOOOOO...

berny i think they have two styles one is cheaper than the bronze one

The Blue Ones I Had Never Seemed To Pump As Much Water As The Black Ones Which Caused Some Heating Issues For Me-- I Dont Think Id Race One.

Randy,

Are you loosing these impellers do to lack of water?
Maybe it is time to put in a manifold with a check valve for all the times you are flying through the air. You would have more of a buffer instead of running them dead dry as soon as the boat leaves the water...

We ran such a system on our triple engine outboard cat. The manifold kept water pressure to all 3 engines, even if one or two engines weren't picking up water from it's gearcases.

I don't know what your rules state in regards to water pickups.
But I can see a hull mounted pick up with a manifold and check valve maybe fixing your issue....

Do you know any plumbers ??? :drink:

Another thing to look for...Casting slag in the housing. We have found in many of the housings, enough sharp edges to tear up an impellor instantly.