Hey Formula31!
 

Yo!
Did you ever post your results regarding the globe blue impellers vs the merc black impellers?
I did a search:
You said you were going to run one blue and one black and post the results, but I couldn't find them.

Did you finish the experiment?
What did you find?
Thanks
DS

After one year, approx 55 hrs. running in some sand and air, the blue impeller looks perfect as does the housing. So does the stock black one. The only thing I notice at this point is that the pump with the blue impeller was easier to turn by hand than the stock impeller. Not that that means anything. One more year I guess. Temps were identical between the engines.