The foil type impeller blade is hugely more efficient at moving water.
Two things I have done to improve the flow capability - as the water enters the pump in the middle,replace the center of the impeller with a cone ( threaded internally LH from the back as per original ).
And secondly you can make ( laser cut - easier ) a cover spacer plate,and increase the impeller blade depth the same amount.
Doing this on an old TZ350 pump with a 5mm spacer nearly doubled the flow rate, and keeps my TZ400 engine running under 50*C.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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