Pump Work

« **on:** December 08, 2014, 06:26:53 PM »

So I decided to get some pump work done on my Southwind since I had a rock do some damage to my impeller. I also had been feeling a slight vibration, so I went down and saw Chris at B 1 Racing. Chris measured the back side of my impeller and it was close to an A/B on one end and an A on the other side. I had Tom Papp detail the impeller about 10 years ago but I don't think he touched the back side of it. I never saw the impeller either since Tom Papp removed it and detailed it along with some other pump work he did for me back then. This impeller is the original impeller since before I bought the boat which is over 25 years ago (maybe the original owner did this). Has anyone seen any thing like this before? The backside of the blades have been grounded down too. Chris said it looks to be all hand done but he hasn't seen anything like it before. It's hard to tell on this picture because of the chip where the rock passed through (but you get the idea).

« **Reply #1 on:** December 08, 2014, 06:45:56 PM »

I had a used spare A/B impeller I bought years ago and Chris said the detail work looked good on it so I decided to throw that in to save a few bucks.

« **Reply #2 on:** December 08, 2014, 07:13:32 PM »

Quote from: 78Southwind on December 08, 2014, 06:45:56 PM

I had a used spare A/B impeller I bought years ago and Chris said the detail work looked good on it so I decided to throw that in to save a few bucks.

(Attachment Link) (Attachment Link)

Be sure to smooth out the transition on the key. You can see where that one was burning the blades.

GT

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« **Reply #3 on:** December 08, 2014, 07:29:23 PM »

Quote from: GT Jets on December 08, 2014, 07:13:32 PM

Be sure to smooth out the transition on the key. You can see where that one was burning the blades.

GT

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Yeah, Chris said he would clean up what little needed to be done to it.

« **Reply #4 on:** December 08, 2014, 07:35:39 PM »

Starks the man when it comes to pump work. He really knows his stuff and will explain everything to you. 👍👍👍👍👍

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« **Reply #5 on:** December 08, 2014, 07:39:06 PM »

Quote from: jyeager on December 08, 2014, 07:35:39 PM

Starks the man when it comes to pump work. He really knows his stuff and will explain everything to you. 👍👍👍👍👍

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Yeah, he spent a lot of time with me explaining everything. Seems like a really good guy.

« **Reply #6 on:** December 08, 2014, 07:43:42 PM »

It looks like some sand got into the seals and bushings.

« **Reply #7 on:** December 08, 2014, 08:35:24 PM »

AT/Dominator Bowl that I bought from Tom Papp about 10 years ago. I guess it was in some write up that Cyclone did for Hotboat about the Extruded AT Bowl. Chris, also said that the bowl had been shortened. He said the idea behind it is to build more bowl pressure.

« **Reply #8 on:** December 08, 2014, 09:02:12 PM »

Chris sent me a couple pictures of the machine and detail work he doing to the exit side of bowl. I am also having him double drill the suction, bearing cap, suction on impeller side and the HPH droop housing. Just in case this pump winds up behind my blown 572 some day.

« **Reply #9 on:** December 22, 2014, 11:24:50 PM »

A couple more pictures.

« **Reply #10 on:** December 23, 2014, 10:06:01 AM »

Looking good👍👍👍👍

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« **Reply #11 on:** December 23, 2014, 10:03:15 PM »

The pump is finished and installed. The next step is to try and get rid of this light top end porpoise. We're hoping the HPH mini droop will fix it since the regular droop was providing to much lift. However, Chris said that the intake was set a 1/2* off so my flat shoe is acting like a 1/2* back cut shoe. Again providing to much lift, so if the porpoise is still there after my next test run Chris is going to make me a tapered shoe.

« **Reply #12 on:** February 18, 2015, 03:52:50 PM »

what was the machining for on impeller side of bowl?

« **Reply #13 on:** February 21, 2015, 11:03:55 AM »

Quote from: JARVIS on February 18, 2015, 03:52:50 PM

what was the machining for on impeller side of bowl?

Chris didn't do any machining to the impeller side of the bowl he only machined the exit side. However the previous owner of the bowl shortened it before I bought it to build pressure.

I am not sure what you a referring to but the suction was machined. Here's a picture of the wear ring being line bored.

« **Reply #14 on:** February 21, 2015, 11:20:16 AM »

We tested the Southwind at Topock since the water was too shallow in Bullhead. The pump is bad ass and the I dig the inducer there's no cavitation at all. However, the smaller droop didn't help the WOT porpoise at all.

« **Reply #15 on:** February 21, 2015, 11:25:04 AM »

Quote from: 78Southwind on February 21, 2015, 11:20:16 AM

We tested the Southwind at Topock since the water was too shallow in Bullhead. The pump is bad ass and the I dig the inducer there's no cavitation at all. However, the smaller droop didn't help the WOT porpoise at all.
(Attachment Link) (Attachment Link)

Is it a fast bounce, or slow and sort of lazy?

Where is the plate at angle wise?

GT

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« **Reply #16 on:** February 21, 2015, 11:28:56 AM »

Quote from: GT Jets on February 21, 2015, 11:25:04 AM

Is it a fast bounce, or slow and sort of lazy?

Where is the plate at angle wise?

GT

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It's a fast bounce that goes away with more weight in the boat or in a nice 6" wind chop. The plate is at 2*.

« **Reply #17 on:** February 21, 2015, 11:35:26 AM »

Quote from: 78Southwind on February 21, 2015, 11:28:56 AM

It's a fast bounce that goes away with more weight in the boat or in a nice 6" wind chop. The plate is at 2*.

I would try raising the plate a degree or two. Do you have video of it running?

Up seems counter intuitive, but I have a thought that it's fighting itself. Let it fly a little.

GT

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« **Reply #18 on:** February 21, 2015, 11:44:50 AM »

We thought it was the shoe since the intake is set at .5* causing the flat shoe to act like a back cut shoe. The intake is also set way high in the boat. So Chris built me a new shoe with a 2* taper to it and compensating for the intake. The porpoise is even worse now. I thinking adding cavitation plates is the only way to fix the porpoise.

« **Reply #19 on:** February 21, 2015, 11:51:56 AM »

Quote from: GT Jets on February 21, 2015, 11:35:26 AM

I would try raising the plate a degree or two. Do you have video of it running?

Up seems counter intuitive, but I have a thought that it's fighting itself. Let it fly a little.

GT

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I have pretty much already tried all of that years ago. I will see if I can find some video or pictures later.

« **Reply #20 on:** February 21, 2015, 11:54:07 AM »

Quote from: 78Southwind on February 21, 2015, 11:51:56 AM

I have pretty much already tried all of that years ago. I will see if I can find some video or pictures later.

Does the engine Rev a tiny bit as it falls,or is it really steady? In other words, are you losing bite?

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« **Reply #21 on:** February 21, 2015, 12:19:33 PM »

Quote from: GT Jets on February 21, 2015, 11:54:07 AM

Does the engine Rev a tiny bit as it falls,or is it really steady? In other words, are you losing bite?

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No rev at all nice a steady.

« **Reply #22 on:** February 21, 2015, 01:22:44 PM »

Here's some pictures before I had the pump work done. This was about a year and a half ago.

« **Reply #23 on:** February 21, 2015, 01:30:57 PM »

Here's another picture. We weren't at wot though.

« **Reply #24 on:** February 21, 2015, 01:50:50 PM »

Boat riding a bit high imho. Do you have a Diverter? I thought you did. What does it do when you lower the trim?

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