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Originally Posted by Althornin
seems as though the march pump is suffering from its relatively "simple" impeller design?
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I have a theory that it may be due to the 1/2" OD outlet. Because the main impeller housing is different to cater for the 1/2" OD outlet, as opposed to the normal 3/8" OD outlets, I suspect that the clearances are a little larger between the different models, resulting in less pressure.
My impeller also seems to be slightly off-center, and I suspect that this is also the cause of the noise that I'm hearing.
Tomorrow I'll be heading around to the local distributor to grab a new impeller and the 3/8" OD outlet housing.
With two impellers, I'll look at hacking up a closed impeller modification to one of the impellers and see what difference that makes (if any).