Just wonder any ideas,,, I have 23ft sleeckcraft daycrusier,,, it has a jacuzzi yj pump..... this boat is a basket case.... i plan on swapping the olds 455 for probably for a bbc... or maybe even a sbc... being 23ft i dont expect to be very fast.. maybe a mid 50s to 60s.... wonder if i should just look for a good used berk, or dominator pump to swap out or just put a enegizer kit on the jacuzzi........It will be a family crusier,,,tubing and knee boarding........plan on pulling deck off boat and doing a total rebuild....Also i heard of people laying a layer of kevlar in between layers of figerglass...anyone done that... i know kevlar aint cheap... but i would like a good strong hull....mississippi cant be pretty ruff..... thanks for reading<<<<
I just took an energized YJ with a AA out of my 25' SleekCraft Ambassador and put a stock YJ back in it. The boat seems to respond better to the stock YJ all around. The biggest improvement is low speed off plan handling. It reverses and turns much better at off plan speeds. This is a big help loading and unloading at the ramp. It gets on plane faster with the stock YJ adn top speed seems to be about the same. For the money and time involved I'd leave the YJ alone. Those pumps are made to move big heavy boats.
It's gonna take a fair amount of HP to get 60 out of that behemoth with a jet.
Last edited by Last Mohican; 07-31-2011 at 08:46 AM.
Read some of your other posts. Sounds like you need to determine your goal and set a budget. If it is truly going to be a family boat used to pull skiers, that Olds 455 and YJ will do the trick just fine, better than a SBC IMO. If you want 60 MPH+ that changes things a little. 60 MPH is about the limit for a YJ. I see no need for the added cost of Kevlar in either case
well i heard the 455 has oiling issue,, what is it and what are the fixes for it...First jet boat,, so i would just like to try and get it right with a motor and pump combo...I think i did read something about yj are for bigger boats....so what do u think buy a stainless AA impeler?.... thanks for ary input
The YJ is a different animal. I believe all YJ impellers are stainless. While there are different pitches to the YJ impeller, it does not follow the same scale as Berkeley impellers. The Olds does have inherent oiling issues if you turn it over about 4500. I'm not sure you would need to turn it past that for a reliable family boat. My Ambassador still has the 455 in it and it does just fine for what it is. A pig of a jet that can haul 13 people. I'm sure someone will chime in with better information. There are several guys around here that can help you more than I can. Tom @ jet boat performance and Duane at HTP are just a couple that will be a big help to you. Hopefully they will chime in soon.
Last Mo has given you some good info , he has expirenced and passed the "test of fire and water" personally with YJs , For that big boat , the 455 and YJ combo are a pretty decent combo, that set up will get that beast up and on plane fairly well , the BBC would be nice , but would not consider an SBC for a full grown heavy cruiser , The current combo will likley give you high forties maybe 50 ish , this will be a great Family float and Tube dragger Keep your expectations realistic and you'll have a good time Good Luck ! Tom
Spend some time digging around on realoldspower.com I'm not sure if anyone offers a stroker crank for a 455. You could probably offset grind a crank but I would think it would be less expensive and more reliable to build a BBC or BBF if you want a stroker motor. If you are going to go that route you will more than likely need to change that pump. The YJ is good for about 5.5K RPM and ~450 HP at most. You can get there pretty easily without building a stroker. Have you considered keeping this boat more of a stock build and getting a smaller boat as your hot rod? or is this the other end of the spectrum and you planning a build like EJ but with a jet? I'm just tossing some ideas out. Either way it is a cool project.