Author Topic: GT Jet Project  (Read 1092 times)

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Offline V153

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Re: GT Jet Project
« Reply #20 on: November 01, 2017, 05:35:48 PM »
Is there a name for that propulsion system? Seriously. Knew they made some jet drive OB motors. Ain't never seen one quite like that.
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_Restoration In Progress


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Offline nes-cv23

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Re: GT Jet Project
« Reply #21 on: November 02, 2017, 12:15:27 PM »
It's called a turbo jet. Not sure who makes it though.. They were installed on four winns boats from 92- 98 from what I've found so far.  Came with a 90hp or 115hp omc power head, although the one I have looks to have a 130 power head with vro oil pump on them. That's what was on mine and failed causing the meltdown so I'm removing that and will just burn mixed gas. Speedo goes up to 50, so I'm hopeing something like that, but??  The gt is smaller and will be a lot lighter then the four winns, so it should be fun..
« Last Edit: November 02, 2017, 12:19:30 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, 76 gt-150, 74 cv-18, 89 219 futura

Offline V153

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Re: GT Jet Project
« Reply #22 on: November 02, 2017, 05:22:02 PM »
It'll be unique if nothing else.
'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

Offline Hyperacme

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Re: GT Jet Project
« Reply #23 on: November 03, 2017, 07:34:45 AM »
Info on Four Winns Fling Jet boat
Gregg
'76 CV16

Offline nes-cv23

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Re: GT Jet Project
« Reply #24 on: November 03, 2017, 01:01:58 PM »
Thanks Greg,   I don't know where you find all this stuff,     I knew someone would find more than I could..
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, 76 gt-150, 74 cv-18, 89 219 futura

Offline nes-cv23

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Re: GT Jet Project
« Reply #25 on: November 04, 2017, 04:58:53 PM »
Was in the "zone" all day and forgot to take pictures of the new stringers.... Instead of just using a 1x6  stringer down the center and two 1x2 on the sides I made them out of a 2x6 and 2x2 they fit real nice in the channels and are all glassed in. Painted the down side and edges of the plywood with marine paint to seal them and now have to glass all the rest in..
« Last Edit: November 04, 2017, 05:08:58 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, 76 gt-150, 74 cv-18, 89 219 futura

Offline Rosscoe

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Re: GT Jet Project
« Reply #26 on: November 04, 2017, 08:18:34 PM »
Very interesting project!
What kind of set up is there for the exhaust?
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite 120 HP Rat Rod
71 V175 Crestflite 350ci -Jet
79 CVX 16
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline nes-cv23

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Re: GT Jet Project
« Reply #27 on: November 05, 2017, 08:12:07 AM »
The exhaust goes through that "tank" and then loops back down one of the big tubes you see in pict. Than through the get.    How ever... I've not had any one explain to me why that other hose that is caped, is used for?   It tee's off the exhaust, than is caped up high.
« Last Edit: November 05, 2017, 08:16:23 AM 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, 76 gt-150, 74 cv-18, 89 219 futura


Offline Hyperacme

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Gregg
'76 CV16

Offline nes-cv23

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Re: GT Jet Project
« Reply #30 on: November 07, 2017, 05:58:47 PM »
Floor all glassed in, ski locker back in, any bare wood sealed with marine paint.. not sure if the little gt can handle a fuel tank up front, but I had one and it fit nice so I'll give it a try. I can always use outboard tanks later.
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, 76 gt-150, 74 cv-18, 89 219 futura

Offline Hyperacme

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Re: GT Jet Project
« Reply #31 on: November 08, 2017, 08:46:10 AM »
The TurboJet is listed at 250 lbs. about the same weight as a 3 cyl. 60 - 75 HP Johnson / Evinrude  motor.
Pretty sure other GT's have bow mounted fuel tanks with the heavier V4 90 - 115 Johnson / Evinrude motors.
Gregg
'76 CV16

Offline nes-cv23

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Re: GT Jet Project
« Reply #32 on: November 12, 2017, 05:28:12 PM »
Time to flip it over and start having fun on the down side... Now you can see how the jet fit into the hull.   All edges within 1/4" so it should grind down, glass in and fill in nice.
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, 76 gt-150, 74 cv-18, 89 219 futura

Offline fireman24mn

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Re: GT Jet Project
« Reply #33 on: November 13, 2017, 03:37:17 PM »
Not sure how picky your going to be but I have some pretty long sanding blocks and a couple air files. If you wanted to borrow them.
I think this has become an addiction.


1977 CV-23 I/O Being restored
1976 CV-23 Jet
1985 Pearson MotorYacht 43ft

Offline V153

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Re: GT Jet Project
« Reply #34 on: November 13, 2017, 03:58:16 PM »
Not sure how picky your going to be but I have some pretty long sanding blocks and a couple air files. If you wanted to borrow them.
Think I'd take Shawn up on that. And focus on the leading edge of your 'graft'. Gonna have to somehow blend the original 'keel' into the 'pad' on the pump?
'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

Offline V153

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Re: GT Jet Project
« Reply #35 on: November 13, 2017, 04:18:47 PM »
Per the info Gregg posted the pad should extend at least 18" fwd of the intake. Looks like you're close?
'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

Offline V153

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Re: GT Jet Project
« Reply #36 on: November 13, 2017, 04:45:47 PM »
Some interesting stuff in the info Gregg provided. Check out "Turbojet Boat Design Considerations" in particular.
'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

Offline nes-cv23

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Re: GT Jet Project
« Reply #37 on: November 13, 2017, 04:55:05 PM »
Thanks for the offer Shawn,  but I've been cutting corvettes apart and putting them back together for years so I have most everything I need.   And the flat part before the intake is almost 23" so it should be good also.
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, 76 gt-150, 74 cv-18, 89 219 futura

Offline Plugcheck

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Re: GT Jet Project
« Reply #38 on: November 13, 2017, 09:23:01 PM »
Not sure if Tim, Makinwaves, has any photos of the tank we built for his gt.  It is a cut down Larsen alum tank, and the filler is under the GT badge.  Actually adds some decent balance.  So I think you will be happy with a tank up front.
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 V153

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Re: GT Jet Project
« Reply #39 on: November 14, 2017, 05:41:16 PM »
60% of the weight aft, 40% fwd. Per Turbo Jet.
'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