Author Topic: GT Jet Project  (Read 1570 times)

0 Members and 1 Guest are viewing this topic.

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
GT Jet Project
« on: October 16, 2017, 05:16:44 PM »
Time to stop talking about it, and start on it!    A buddy of mine had a little jet boat, you know the ones with a jet ski set up, but in a little boat. Lots of fun!!  But then I thought... A little gt-150 would be a great boat with a jet..   I had another gt I was going to fix up so I just needed a jet boat for a donor motor and drive..  Found one!  It's a 94 four winns fling with a 115hp omc motor. Freshly rebuilt.. But the guy didn't want to pay his bill on the rebuild. So after 6 years my motor man said I could buy it if I paid for the parts used in the rebuild. Deal!   
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3103
Re: GT Jet Project
« Reply #1 on: October 16, 2017, 05:25:01 PM »
Should be an interesting project! Look forward to seeing this come together and how it works!
Brandon Hain
1975 v-179 starflite 
1978 CVZ-18

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #2 on: October 16, 2017, 05:25:53 PM »
First step.. Cut the donor apart.. It actually came apart easy. They had the same rotten core that the glastrons do.  :)  Split it in half to get at the motor and drive. All the controls, stearing and gauges will be used again. The gt is a little smaller so everything should fit.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #3 on: October 16, 2017, 05:34:51 PM »
Next. Time to take the motor out and see how it all goes togather.  I think this will work out good. Very simple set up.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #4 on: October 16, 2017, 05:40:18 PM »
Next. Time to split the gt.. But this is enough for this weekend.. By the way the gt is a 76 with no wood left in it that's good.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline Diamond Chad

  • Contributing Member 2016
  • Sr. Member
  • *
  • Posts: 345
Re: GT Jet Project
« Reply #5 on: October 17, 2017, 08:09:58 AM »
Great project!  Thanks for bringing us along to watch.  While you have that power package out of the donor, how much does it weigh and how will that compare to the weight of hanging a typical outboard on the transom?
87 CVX18 5.7
88 CVX16 115 Merc
57 Dunphy Imperial Musky - 57 Golden Javelin
01 Malibu Sunsetter 21 LSV 340 EFI

Offline Plugcheck

  • Hero Member
  • *****
  • Posts: 1741
Re: GT Jet Project
« Reply #6 on: October 17, 2017, 08:21:52 AM »
Probably make for better weight balance as the engine is forward of the transom.   Really a cool project, could really make for some neat changes to what was formally the splash well area.  Maybe a small sun pad across the rear?  or flip up engine cover?   or maybe a mini CVX cover?     Now to find a diverter that will work on that size jet............
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project, gps 85 mph (on trailer)
1989 Lowe 200 Redneck fishin Toon

Offline Hyperacme

  • Administrator
  • Hero Member
  • *****
  • Posts: 9696
Re: GT Jet Project
« Reply #7 on: October 17, 2017, 09:59:57 AM »
COOL !
Is the motor just a V4 OMC outboard motor ?
The jet assembly just bolts to transom and motor sits on top ?
Large container on side of motor is the fuel tank ?

Gregg
'76 CV16

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #8 on: October 17, 2017, 04:48:01 PM »
I don't think the balance will be a problem because the omc power head is the same power head on every other 115 Johnson or Evenrude the only diff is that it's on a jet instead of a outdrive and the boat is rated for a 90hp and that's the same block as the 115 so weight should be the same. It will sit about a foot farther up in the boat. The "tank" I think is a muffler or some kind of expansion tank the exhaust goes through it. As far as the splash well, I have a cover from a 16-ss that fits nice in that spot so that's the plan for motor cover. I'm trying to make it like the motor cover and rear of a 16-ss.
« Last Edit: October 17, 2017, 04:51:27 PM by nes-cv23 »
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline Carlson_from_Germany

  • Sr. Member
  • ****
  • Posts: 342
Re: GT Jet Project
« Reply #9 on: October 18, 2017, 10:58:45 AM »
Nice project! I've only seen one GT150 with an inboard so far.

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #10 on: October 22, 2017, 04:34:44 PM »
Split the gt today.. As soon as I took all the rub rail apart the top just lifted off. No good wood at all. Transom has only holding togather by about 3" of glass left and that popped off with one twist of a pry bar. Time now to cut out what is left of the floor, stringers and transom.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline Silver GT-150

  • Sr. Member
  • ****
  • Posts: 152
Re: GT Jet Project
« Reply #11 on: October 22, 2017, 08:29:13 PM »
Looking good!

Offline Hyperacme

  • Administrator
  • Hero Member
  • *****
  • Posts: 9696
Re: GT Jet Project
« Reply #12 on: October 23, 2017, 10:19:29 AM »
Is the gel still OK ?
Looks pretty good from pictures.
Gregg
'76 CV16

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #13 on: October 23, 2017, 06:34:01 PM »
The gel is in good shape, that's what I look for when I'm going for a new project. Fiberglass in good shape with just the wood being bad.    All the floor, stringers and transom is out. Wood still soaked after being in a garage for two years. I think I can salvage the bow framing and ski locker.  now time clean it up and get it ready for the repower.
« Last Edit: October 24, 2017, 06:10:38 PM by nes-cv23 »
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #14 on: October 26, 2017, 05:36:32 PM »
I thought closed cell foam was supposed to be water proof?....  HA!  I cut out about 250 lbs. of water soaked foam from the jet hull. No wonder I couldn't lift it.. Now need to clean it up and get it ready for the swap.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #15 on: October 28, 2017, 04:34:59 PM »
Cleaned up the jet and cut it down to fit. Set it in place... This is going to work.. :)   .. It fit like it was made to. Now I'm excited.   ;D   I think I have to call it a jet boat now..
« Last Edit: October 28, 2017, 04:36:52 PM by nes-cv23 »
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3103
Re: GT Jet Project
« Reply #16 on: October 28, 2017, 04:46:03 PM »
looks like it was meant to be!
Brandon Hain
1975 v-179 starflite 
1978 CVZ-18

Offline Plugcheck

  • Hero Member
  • *****
  • Posts: 1741
Re: GT Jet Project
« Reply #17 on: October 28, 2017, 06:06:23 PM »
Will you be glassing in that section, or using it as a template?  Curious how the drive mechanism attaches to it's original hull.  Are there fasteners that come from the bottom? 
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project, gps 85 mph (on trailer)
1989 Lowe 200 Redneck fishin Toon

Offline nes-cv23

  • Hero Member
  • *****
  • Posts: 475
Re: GT Jet Project
« Reply #18 on: October 29, 2017, 08:23:30 AM »
The last 2 pictures show the drive in place. Now I will be glassing it into the rest of the hull. The drive is fastened to the original hull with bolts and sealer, the hull is very thick at that point and that's why I'm saving that and grafting it in about 6" on the transom and sides and about 2' in the front to keep the flat bottom for the jet.
Past to present: 84 ssv-151, 76 cvx-16 ss, 77cvx-20 jet, 90 CSS-19, 77 gt-150, 2-78 cvx-16, 79cvx-16, 79 cvz-18, 78 cv-23, 73 cv-16, 74 cv-18, 89 219 Futura, 76 150 Gt.-jet

Offline V153

  • Hero Member
  • *****
  • Posts: 4676
Re: GT Jet Project
« Reply #19 on: October 31, 2017, 06:08:33 PM »
I'm reserving judgement til I hear some numbers ...
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_Restoration In Progress


WALK TALL AND CARRY A BIG BILGE PUMP