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Messages - 96Laveycraft21Xt

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1
Engine Mechanical / Electrical / Re: Olds oil pickup help
« on: March 13, 2018, 07:31:47 AM »
I've been doing Oldsmobiles for many many years also



Sent from my iPad using SoCal Jet Boats mobile app

I built my first 455 with that mondello's tech manual.  Bills book is great also!

2
Best wishes to you!  Love to see olds power! wish my 442 was in that HP ballpark....  8)


It will be pretty tough to hit that number with that valve size though... Do you mind giving out the cam specs?

Is it really a 457 or is that a typo?

3
Sounds crisp!!  Havent tried a Lunati in and Olds yet.  What aluminum heads are those?


What numbers are you hoping for to turn that AA?

4
Jet Pumps / Re: Berkeley Pump - need help
« on: March 06, 2018, 07:19:31 AM »

1971 Tahiti 19 v Hull. 


Sent from my iPhone using Tapatalk

Just for reference, our 69 tahiti with 425 horse turns 5100 rpm at 69 MPH on GPS.  I would think maybe your Tach is off.



this isnt a white boat with blue/pink/purple stripes is it????????

5
Engine Mechanical / Electrical / Re: Solid or Hydraulic Flat Tappet
« on: February 09, 2018, 01:00:44 PM »
Both of those cams are way too big for what you are looking to do.


I would recommend the Schneider Racing JB-3H . They are out of san diego and have been making cams since the 70s or 80s cant remember right now.

224* / 230* .540"/ .540" on 112.  Just put this in a 468 BBC and pulled 500 HP at 5500 with headers.   The cams you listed will peak power too high for what you need in a jet boat.

Just my $0.02

6
Engines / Engine Parts For Sale / Re: ISO 455 olds crank
« on: February 09, 2018, 11:45:22 AM »
I have a couple as well if he doesn't get back to you.

951-850-3298

Call or text if interested.

7
Engine Mechanical / Electrical / Re: 455 timing
« on: January 25, 2018, 04:48:33 PM »
Pretty sure our 455 ended up at 18 initial and 36 total... pertronix hei

8
Engine Mechanical / Electrical / Re: Cam question.
« on: January 25, 2018, 04:46:28 PM »
Well, when you get the problem sorted out, i would highly recommend the Schneider Racing JB3 cam.  Just put that into my Boss's 454 (468) and pulled 503HP.  It is a marine cam designed for jetboats and performed GREAT . I also had a 750 carb  8) :thumbup: :beer:

9
Engines / Engine Parts For Sale / Re: Looking for a rebuilt 455 bb olds
« on: January 22, 2018, 03:45:54 PM »
the cheapest bet would probably be to find a good take out as offered above.

But it depends on your budget, intended power output, and if you were looking to have yours rebuilt, what went wrong with it?

10
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: January 18, 2018, 03:45:01 PM »
My first thought was hook, which was created when the intake was installed wrong. I didn't describe how to check that very well.

Thanks for the update  :thumbup:

No Problem, when i think of hook my first thought was to check the sides that are fiberglass.  never thought to check the shoe but now lookinging at it, the angle looks soooooo obvious....

Now i know why it was so hard to bend the plate up 3*  :-[ :-[

11
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: January 18, 2018, 11:04:55 AM »
I never thought to check there cuz, well, i guess i assumed that it would be correct and that it would all be in the ride plate adjustment...

Guess not!

12
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: January 18, 2018, 10:16:52 AM »
Ok, well since this thread sort of died, im going to bring it back with a little update.....



I dropped a fresh 454 off to GS marine for my bosses 81 Bahner about a month ago and while i was there i asked Greg about my problem.   Now i am not kidding when i tell you that i didn't even get to finish my first sentence.

Went just like this:


Me: Hey Greg, i have a problem with my boat.  Its a 96 lavey craft 21 Jet ...

Greg:  ....and i bet it porpoises like crazy.......

Me:   :o :o :o

Me: so thats a common thing??????? :banghead: :sly:





Long story short i guess,  Lavey had a guy setting the jets in those days that was less than knowlagable and was setting them wrong.  They  were just bolting them to the transom BUT with the delta pad being up 3* the shoe of the pump was still level with the keel or down 3*.

Greg said to go home and check.  This is what i found.






So, proposed solution from GS is the shim the bottom of the pump back 1/2" to 5/8" till the shoe sits inline with the delta and re-set the intake to match.


Thoughts?   :beer:

13
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: January 18, 2018, 09:20:58 AM »
What length and weight is the hawaiian?  Was that 4* up or down?  what HP or rpms are you turning?  what type of speeds did it porpoise prior?

Thanks!

5150, you there?   ;D

14
Arcade / Re: Need a 455 olds engine !!
« on: January 15, 2018, 07:34:28 AM »
I have enough parts in the garage to build 2!!  haha.


What happened to yours? are you interested in rebuilding yours or are you looking to buy one ready to drop in?

15
Jet Pumps / Re: Berkeley pump rebuild
« on: January 09, 2018, 02:55:01 PM »
Just out of curiosity, why not GS?

16
Projects / Re: Does a jet drive need all that hp??
« on: October 30, 2017, 03:09:00 PM »
my baby brother started with the boat in the family. 18' & Berkeley behind a  454. He had a guy build the motor to 400+ HP and wanted more when he had the money.

I'm a little lost. I could see more HP as you put on bigger and bigger props. I cant see that much difference in impellers. Once you reach 3,000 rpm's the pump is going to pump the same CFM isn't it? Why couldn't a 4 cyl Pinto motor do the same thing and save gobbs of gas?

Im thinking a Rotary Wankel or electric motor... No, I'm not using a Pinto :p

Seriously, what HP can you drop down to before you loose top end. I'm not looking to go 70. Skiing speed would be fine maybe in the 40-45 range.


You are mostly correct in that the SAME pump with the SAME impeller with require the same HP to turn a given rpm.

That 400 hp 454 will turn an "A" impeller to roughly 5000 rpm and that boat will likely cruise somewhere around the 60 -65 MPH range. 


Example: 

Our 18 foot Tahiti has a 455 olds about 430 hp and turns 5100 rpm, boat will max out at 69 on GPS

friends 16 commander jet with 350 chevy and 260 hp will turn 4400 ish rpm and will max out at about 45 mph



HOWEVER, both boats are pretty even cruising down river at 3800 rpm, and i bet the 350 will do better on fuel.  Its all about how fast you want to go.....

17
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: October 26, 2017, 01:56:33 PM »
Tim at place did a drop, ride plate to mine with 4* wedge and problem solved, I have a 1999 team Hawaiian and it was bad prior

Sent from my SM-G955U using SoCal Jet Boats mobile app

What length and weight is the hawaiian?  Was that 4* up or down?  what HP or rpms are you turning?  what type of speeds did it porpoise prior?

Thanks!

18
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: October 23, 2017, 12:05:26 PM »
Basic pic of the setup as i bought it.



Here you can Kinda see the delta pad and angle of the ride plat at rest



This is the final spacer set up to get it level to delta


19
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: October 23, 2017, 11:48:36 AM »
Use a straight edge to check for hook. I have a 4ft steel ruler I use. Hold it up against the bottom on both sides of the jet and see if you have a significant gap near the back.

Pics of the jet set up would help. Both sides & back view.

Let me see what pics i have of the pump set up.  I know i have some somewhere from when i shimmed it up...... give me a few.

20
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: October 20, 2017, 02:45:29 PM »

21
Jet Pumps / Re: 96 Lavey Craft 21Xt porpoising problem
« on: October 20, 2017, 09:46:51 AM »

22
Jet Pumps / 96 Lavey Craft 21Xt porpoising problem
« on: October 20, 2017, 09:45:01 AM »
Hey there everyone, been scoping around for a while but this is my first post.  I wanted to get some feedback from some great minds here.

My history with Jets ?  My Brother and I have owned a '69 tahiti 18' with 455 olds/berkeley combo for 13 years.  it was our first boat.  3 years ago i upgraded and bought my 96 Lavey Craft 21 XT Ski with a 454 (330hp) and Dominator pump.

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Our Tahiti ran on rails with the place diverter, the Lavey, not so much.  Porpoises all the time, at all speeds.  The only real way to stop it is to toss two kids up front and trim all the way down.  not the best for cruising efficiency haha.


About the boat:

transom to nose 21', total overall length with built in swim step 22' 8".  #/- 3300 lbs .  Dominator insert pump and the hull had a delta pad that best i can measure with angle finder is 3* up from keel.


When i bought it, the ride plate (Cav plate? )  its small like 8" x 12", was set 3* down from delta (0* from keel)  i adjusted up 3* so that it was inline with delta pad and no change in porpoising.   This is very annoying as i cant cruise faster than 3800 or even trimming all the way down doesnt work any more and i cant ever throw a roost as i look like a bucking bronco fool on the water  :mad:



What are your thoughts?

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