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Author Topic: CV16 and motor options  (Read 1624 times)

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Offline wpstarling

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CV16 and motor options
« on: July 23, 2020, 07:30:55 AM »
So long story short, my Johnson 120 is toast and I am left with deciding between 2 motors to put on the CV16.  I have a 93 bass boat with a 93 Yamaha 115 on it that has a 4 blade prop 17*P on it and I have an 85 Johnson 90 with a 12.75" by 21* prop on it.  Obviously one is more holeshot and one is more top end but my question is which motor should i put on the CV16?  It is going to be used more for skiing/tubing/etc than top speed but we will use it to cruise down the rivers here so I have to keep that in mind.   Also, do i need to change props for what I'll be using it for?

The Yamaha 115 on the bass boat does 45mph trimmed up with light gear and my family on it so it ought to push the Glastron well but I don't want to swap the motor off of it if the Johnson 90 will work fine with the right prop so I'm turning to you guys to help out :)
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1972 Glastron-Carlson CV16

Offline Hyperacme

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Re: CV16 and motor options
« Reply #1 on: July 23, 2020, 01:07:13 PM »
Would guess high 40's low 50's with 115 HP Yamaha.
Maybe mid 40's to almost 50 MPH with the 90 HP Johnson.
Depends on a lot of things .. I lose about 4 MPH with full bow mounted 18 gal. tank and a 200 lbs. passenger.

If speed isn't your goal, the 90 HP would work. Save you the trouble of changing your throttle control.
When Glastron tested for estimates below, motors were rated at power heads, your are both prop rated.
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Offline wpstarling

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Re: CV16 and motor options
« Reply #2 on: July 23, 2020, 01:26:56 PM »
Man Gregg, you have all sorts of info!  I spent the past 4 days looking for something like that page.  The 90 sounds good on the stand so hopefully it is good.  The bass boat is mostly original so part of me wants to keep it that way.  I want to go ahead and clean the motor up before putting it on anyway.  Once i get it back up and running i'll post some pictures in my restoration thread for it. 
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1972 Glastron-Carlson CV16

Offline Hyperacme

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Re: CV16 and motor options
« Reply #3 on: July 23, 2020, 02:02:38 PM »
Believe OMC V4's were 90 to 120 HP, with just some parts swapping.
Carb's, bubble back exhaust, etc. and your 90 is a 115 HP motor.
Find a junk motor or parts on Craigslist / eBay .. Doug would know what you need for your 90 to make more power.
But don't think you'd want to pull the kid's around at much above 30 / 35 MPH.
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Offline wpstarling

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Re: CV16 and motor options
« Reply #4 on: July 23, 2020, 02:16:41 PM »
I've heard that before so maybe Doug will chime in or I can find something on Google about it. 

Kids won't be pulled too fast, but I do like to slalom so i might hit 30-32 regularly for me.  The wife is telling me to throw the 115 on there but I just keep thinking of how much work it'll be  ;D  She says I won't be happy with 'just' the 90.
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1972 Glastron-Carlson CV16

Offline Hyperacme

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Re: CV16 and motor options
« Reply #5 on: July 23, 2020, 02:26:03 PM »
I can tag him on FB, if you have question about mod's on 90 HP.
I know ... After 36 years of wedded bliss to the "War department"  .. Listen to your wife !
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Offline Plugcheck

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Re: CV16 and motor options
« Reply #6 on: July 23, 2020, 05:31:54 PM »
Considering the ease of transfer, and wanting to keep the bass boat intact, it sounds like you want to go the 90hp route.   Was the 120 tired? Or did it break. 
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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
1989 Lowe 200 Redneck fishin Toon
2001 Godfrey Sweetwater pontoon 115 Rude

Offline wpstarling

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Re: CV16 and motor options
« Reply #7 on: July 24, 2020, 07:19:35 AM »
Well I want the 115 on the CV but i just don't know if it's worth the work/tearing down the bass boat to transfer it.  But I really don't want the CV to be underpowered.  If the bass boat only does 35mph then fine but if the CV isn't fun or can't properly pull skiers, wakeboard, tube, etc then I won't like it. 

The 120 caught fire from all the leaking fuel so since I couldn't assure it's safety on the water I sold it.  Actually didn't have to buy the 90, i traded a motorcycle project for it plus some cash so it worked out in my favor (assuming the 90 runs as well as I believe it does).

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1972 Glastron-Carlson CV16

Offline Oldfishguy

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Re: CV16 and motor options
« Reply #8 on: July 24, 2020, 09:00:10 AM »

I think your trying to talk yourself out of the extra work to put the 115 on the CV???

Do it once right, and then your done.  I have a 1972 CV16 with a 1973 Chrysler 120 on it; I think that old 120 is more like that 90 your thinking of putting on the CV.  My top speed is 41mph, without trim.  Acceptable for what I do, but I do not pull skiers with it.  For one thing, these boats are so light they pop out of the water and on plane in a snap (even with 4 people in the boat).  Tubing does not take a lot of horsepower, but pulling a 200 lb skier out of the water quickly . . . you want all the horsepower you can get. 

I know if my old Chrysler 120 ever decides to give up I'll be hunting for a Johnson 115; they are just good motors.

Best of luck.

David   

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1972 1/2 Glastron CV 16
1973 Chrysler 120
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