Author Topic: 79 CVX16SS Best Prop Size?  (Read 12206 times)

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Offline demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #40 on: October 31, 2019, 11:18:10 AM »
Your local Merc dealer should have one for about $20.

So I ordered this and it should be here tomorrow. I pulled my old tab off and when I loosened it i noticed I could only rotate it a very little amount. Is this correct that it only rotates a few degrees? And that if i am pulling left, I should point the rear of the tab to the left (clockwise) all the way and start there?
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Hyperacme

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Re: 79 CVX16SS Best Prop Size?
« Reply #41 on: October 31, 2019, 11:31:40 AM »
Yes .. Will only rotate a small amount.
You will have to test it to see which angle works best for your set up.

Offline demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #42 on: October 31, 2019, 12:05:01 PM »
Yes .. Will only rotate a small amount.
You will have to test it to see which angle works best for your set up.

How about needing the big star washer under the castle washer?
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Hyperacme

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Re: 79 CVX16SS Best Prop Size?
« Reply #43 on: October 31, 2019, 12:43:32 PM »
Did a search for "mercruiser trim tab anode" and none show a star washer in kits.
Not sure if needed or not ..

Offline demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #44 on: November 04, 2019, 10:14:41 AM »
Did a search for "mercruiser trim tab anode" and none show a star washer in kits.
Not sure if needed or not ..

This would be for the prop castle washer. I see them on some, but based on your response, you may not have ever needed one.
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Plugcheck

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Re: 79 CVX16SS Best Prop Size?
« Reply #45 on: November 04, 2019, 11:39:25 AM »
Setting the trim tab is simply trial and error.  As you trim up/down and increase/decrease RPM the amount of torque steer can change. 
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 demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #46 on: November 07, 2019, 02:44:50 PM »
Setting the trim tab is simply trial and error.  As you trim up/down and increase/decrease RPM the amount of torque steer can change.

Now that I have the offset tab, will it make a difference if i use it on a prop that doesn't require the offset tab (less pitch)? Or should I swap out to the old one for the prop with less pitch?
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Plugcheck

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Re: 79 CVX16SS Best Prop Size?
« Reply #47 on: November 07, 2019, 04:02:23 PM »
I assume by offset, you mean the tab is offset to clear the prop?  I doubt it would make a measurable difference changing it.  If you do find the sweet spot of a given tab/prop combo, I make a mark so it can be returned to that setting after a change. 
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 demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #48 on: February 07, 2020, 10:24:24 AM »
I'm going to drop the prop off at a local shop for some work (new hub and cleaned up). Should be about $100. I also have a 15p mirage Im gonna try and barter work for trade of that prop. I don't think I will need a 15p on my 140 in my 16'.

Has anyone ever had a solid mounted rubber hub prop converted to a newer style torque flo?

Im excited about this 23p!
« Last Edit: February 07, 2020, 10:26:52 AM by demian5 »
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Hyperacme

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Re: 79 CVX16SS Best Prop Size?
« Reply #49 on: February 07, 2020, 10:52:21 AM »
Rubber hubs are round, Flo-Torq hubs are squared.
You could ask your prop shop … But guessing no you can't convert.

Offline demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #50 on: February 07, 2020, 12:33:57 PM »
Should I hold onto this Mercruiser MIRAG 48-19838A41 15.75X15 RH Prop?

Would I need something like this for my boat?
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Plugcheck

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Re: 79 CVX16SS Best Prop Size?
« Reply #51 on: February 07, 2020, 02:05:58 PM »
I've never tried to run such a large diameter prop, I could take a look, but something in the back of my head tells me a 16" will hit the cav plate on an alpha drive.  For a 140 Merc, I'd shoot for a diameter around 14.25" and a 21 pitch if the engine runs fair.  In the end it's a bit of trial and error, find a dealer who will let you test props.   Been my opinion when testing to change one variable at a time.  Same manufacturer, same diameter, and model, but vary pitch for instance.  Trying a 21 pitch laser 2, then a 23 vengeance, then a 4 blade trophy in 20 pitch can leave ya confused.  Kinda like what are the best tires for my car.   To specifically answer your question, I'd get rid of that prop, but I might try it first anyway.
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 demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #52 on: February 07, 2020, 03:17:01 PM »
So I took both the 15p and 23p to a prop shop, talked to them and walked out with a Lazer 2 19p in trade for both. Both props I brought needed new hubs and some cleanup.

I should be plenty happy as Im going from a 15P to 19P.
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"

Offline Hyperacme

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Re: 79 CVX16SS Best Prop Size?
« Reply #53 on: February 07, 2020, 06:46:07 PM »
It comes down to testing now …
You need 4200 to 4600 RPM's and mid to high 40's MPH.
Try to test all props on the same day, different temp's and water conditions can make a 1 to 3 MPH difference.

Offline Plugcheck

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Re: 79 CVX16SS Best Prop Size?
« Reply #54 on: February 07, 2020, 08:22:10 PM »
So I took both the 15p and 23p to a prop shop, talked to them and walked out with a Lazer 2 19p in trade for both. Both props I brought needed new hubs and some cleanup.

I

I should be plenty happy as Im going from a 15P to 19P.
.       I think you should be happy with that prop, 19p might be a little lacking in top end speed, but you need to test it.   Really decent deal though, 2 for 1 when those 2 required work.
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 demian5

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Re: 79 CVX16SS Best Prop Size?
« Reply #55 on: February 10, 2020, 10:11:35 AM »
.       I think you should be happy with that prop, 19p might be a little lacking in top end speed, but you need to test it.   Really decent deal though, 2 for 1 when those 2 required work.

Thanks - I figured it would be better than what I have and if I decide to throw 4 adults and gear and coolers in there, it will still get out of the hole decently. Where I go, there are jet boats and all the trick stuff, so I don't need to be the fastest on the water, just reliable and fun.
1979 Glastron Carlson CVX 16 SS I/O Mercruiser 140 "Brick House"