This question has probably been asked and answered 100 times on here but could not find any old threads... But is there benefits or down falls of speed coating the inside of my bowl and my impeller.?My intake and loader have already been done.
Speed coat the inside will also help show you where your problem areas turn up watch where it comes off in the pump and address those spots
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As I have been going through posts today looking for an old friend I have found that people really get great advise, and the one above is very good. And this is a speed secret from 1980's. We had our very good friend and racing associate ( Parker 9 Hour) Joe Mondello polish the vanes in our bowl as far as he could reach and then had them bead blasted where he could not reach. This was all preparation to have the bowl Teflon coated. Speed coating and Teflon work because they actually are removed by the friction of laminar flow in the individual chambers of the bowls stator vanes. And as an aside those vanes are designed with an acceleration rate to increase velocity to the pressurized water passing through, velocity is what creates boat speed. Since the surface treatments move with the flow they reduce the frictional losses but wear off. Imagine our surprise when all the Teflon was removed from all the vanes - but one. That vane was 90 degrees from when the impeller went over the pump shaft. Common theory back then was that the incoming water was homogenized in front of the impeller because testing we did showed varying pressures in the suction piece in front of the impeller (also confirmed by Berkeley's tests at lower speeds and no scoops). But obviously this was incorrect based on the uneven Teflon removal. We contacted Ralph Rhoda the designer of and head of Berkeley Pump Co. He built three test bowls with the bowl vanes moved back .750, 1.00 and 1.125". The .75 worked the others were a disaster. The Teflon was still not totally, uniformly removed but the boat ran great. Oh, by the way the boat was "Rated X'.