Hey fellas, I'm a newb around here so I'll try not to sound like too much of an idiot. I have a 1979 Youngblood TX-19 with a Berkeley 12-JR pump in it. I bought the boat two years ago and it is in absolutely mint condition. Supposedly it was raced from the time it was new in 79' until 81' when the guy who I bought it from purchased it. Anyway, when I bought the boat it had a fairly mild roller cam 468 bbc in it with a full interior and it ran 78-81 on the gps with just me in it all day long. Well, being like the rest of you guys probably are, I couldn't leave well enough alone so I decided to buy a bigger boat with an I/O for family outings and make the Youngblood a HotRod!
I stripped everything out of it including all of the interior and carpet and went back with two carbon fiber bucket seats with snap on covers and fresh gel-coat on the floor. Then I decided to have a new engine built and wound up with an aluminum headed 10.5:1 pump gas tunnel ram 540bbc. The engine is nothing radical, it makes 720hp and 695lb ft of torque.
Okay, here's where the fun starts. After putting the new engine in this spring we went out and ran it around a little and everything was fine. Then when I finally decided to get after it a little, the pump started cavitating pretty badly and there was no way I could keep my foot in it, not even once the boat was on plane and running 30 plus mph or so. If I was running along at 3000 rpm and stomped on it the engine would just go to the moon.
So we took it out of the water and pulled the bowl off to see if there was something in the pump, and that is when I saw something that was new to me, a NON metallic wear ring! I have owned jet boats for 12 years and I have rebuilt three different pumps, but never have I seen anything like this. It appears to be made out of some kind of plastic or something, and the one in my pump appears to be chewed up quite a bit.
I went ahead and pulled the pump because I think the smart thing to do would be to go ahead and rebuild it at this point with the new engine and all. What I would like to know though is, what is the deal with this wear ring that I have, what was it's intended use, and should I be going back with a stronger brass/strainless wear ring in my higher horse power application, or will I have to use a similar wear ring to what I have now because the pump was set up to use it?
Also, because of the increase in power, and hopeful huge increase in speed, I am thinking of having the pump professionally done so that it can be properly checked out and set up specifically for this boat/engine combo. If anybody can recommend a good pump guy who knows his stuff that I can send this thing to, I would appreciate the info.
I think I need a different cut impeller as well as some other hardware changes and I will be needing some help with that also.
I apologize for the lengthy first post and newbie questions, as well as all of the probably unecessary information, but I am about to pull my hair out stressing over this deal. Thanks.