Author Topic: Merc Laser 2 21p prop hub identification  (Read 8642 times)

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Offline UKMike

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Merc Laser 2 21p prop hub identification
« on: September 06, 2018, 12:59:16 PM »
Hi all,

I have a question that I'm sure one of you will be able to answer, I have a laser 2 21p prop on my Merc but when I take it off the hub seems to come off with the prop and it seems to be a fixed hub, I have looked online and there seems to be a hub called a torq flo 4 that looks similar but that's too new for my prop, does anyone have any ideas?

Best
Michael.

Offline Hyperacme

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Re: Merc Laser 2 21p prop hub identification
« Reply #1 on: September 06, 2018, 01:36:21 PM »
Flo-Torq hub props will have the round PVS holes.
You can Google part number stamped on prop to find out what it is.

Laser II info ..
https://www.mercurymarine.com/en/us/propellers/sport-series/laser-ii/

Offline Plugcheck

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Re: Merc Laser 2 21p prop hub identification
« Reply #2 on: September 06, 2018, 01:43:54 PM »
      I believe your asking about the "Insert"  a square piece of plastic that fits inside the prop, then the metal part goes inside to adapt to the splines of the output shaft.   The Flo-Torq fits many props, but I had a prop with a permanent rubber insert that stripped out.   I was able to press that out and use the flo torq hub in it.   Anyway, it is possible your prop came with a permanent hub, but I thought the Laser was new enough that it was designed for this type of hub.
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 UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #3 on: September 06, 2018, 02:40:16 PM »
Thanks and yes it's a fixed hub "permanent rubber insert" and it looks like the flo torq 4 is the replacement part, but I assume it would mean removing the existing rubber and long sleeve metal insert. I guess this would need a hydraulic press or something. Does anyone know where I can find the info on the older permanent rubber fixed hubs? And I wonder if this is pressed out if a standard flo torq would then fit the unit. Do you think Mercury is the best call to make to find out?

Best
Michael.   

Offline Hyperacme

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Re: Merc Laser 2 21p prop hub identification
« Reply #4 on: September 06, 2018, 05:00:26 PM »
Any prop shop should be able to re-hub your prop.
Don't think it's something you can do at home.

Offline Plugcheck

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Re: Merc Laser 2 21p prop hub identification
« Reply #5 on: September 07, 2018, 03:59:57 PM »
Certainly a prop shop could assist, but they prefer to sell new rather than spend time on old props.  I suppose you'd have to ask them before deciding.  Our local shop told me to toss it.  One friend suggested burning the hub out, but I ended up pressing it out, then found the flo torque fit well.  BTW, my rubber hub stripped out, so the prop could not be used.  Maybe it could be cut or drilled out?
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 Hyperacme

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Re: Merc Laser 2 21p prop hub identification
« Reply #6 on: September 07, 2018, 04:02:11 PM »
So a old press fit hub can be removed and a Flo-Torq hub will fit in ?

Offline Terry_Curran

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Re: Merc Laser 2 21p prop hub identification
« Reply #7 on: September 07, 2018, 04:04:47 PM »
So a old press fit hub can be removed and a Flo-Torq hub will fit in ?

I took my SS prop in for repairs and I was told the hubs weren’t interchangeable

Offline Plugcheck

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Re: Merc Laser 2 21p prop hub identification
« Reply #8 on: September 07, 2018, 05:46:28 PM »
Can't say which ones it works on, but I had one on the 16ss that I removed the center and rubber shock part.  This was because it was frozen on the prop shaft and the center broke free trying to pull the prop off.  I took it in and asked if they had a new hub, and the flo torque 2 hub kit fit perfect.  Fairly certain it was a merc prop.
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 Rich_V174SS

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Re: Merc Laser 2 21p prop hub identification
« Reply #9 on: September 08, 2018, 04:46:09 PM »
Only some of the Mercury stainless props originally equipped with pressed in rubber hubs can accept the Flo-Torque hub insert. The one I currently have on my boat, an old Quicksilver stainless was such a prop. A prop shop can push out the old hub and tell you weather or not the plastic insert will work, it depends on the shape inside the hub.
1967 V174 Crestflite SuperSport Modified
1987 Mercruiser 190 3.7LX/Alpha One

1970 V176 Swinger
1983 Mercury 115

Offline Terry_Curran

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Re: Merc Laser 2 21p prop hub identification
« Reply #10 on: September 09, 2018, 07:09:11 PM »
After seeing a torq-flow insert I’ve decided they require a special hub.

Offline UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #11 on: September 11, 2018, 09:13:52 AM »
Thanks all 😀

From my research there are 3 different flo torqs that fit the Merc props and one is for the laser solid insert prop, which is what my laser 2 is and what a prop it is..... I hit the shingle a couple of times and now I have vibration even after putting in a new shaft so it must be the inner mount or insert as they call them. I don't want to throw the prop away, as I have the Merc substitute prop as a replacement and there is no comparison, my laser also has the vent holes where the new one doesn't and the difference really is noticeable, I still have no idea why they stopped the laser 2 props, they are fantastic......

Offline Hyperacme

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Re: Merc Laser 2 21p prop hub identification
« Reply #12 on: September 11, 2018, 09:54:52 AM »
Ya .. Merc's web site is confusing on Laser II's ..
Laser II's could have been replaced by Vengeance prop for Alpha and large gear case outboards ?

Have you seen this brochure ?
https://embed.widencdn.net/pdf/plus/mercurymarine/mvqhcv0eoi/Mercury-Propellers-brochure.pdf?u=orhjei

Offline aquamaniac

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Re: Merc Laser 2 21p prop hub identification
« Reply #13 on: September 11, 2018, 05:16:09 PM »
Tempest Plus is the recommended replacement for the Laser II for V-6 outboards. The Vengeance looks more like a replacement for the QSS Stainless.

Here are some images from the 1991 prop catalog, it includes Mercury part numbers. These are all pre-Flo Torq II hubs. It looks like the Flo Torq II system also uses different thrust washers so if you change prop hub styles be sure to use the correct thrust washer for the prop.

Offline UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #14 on: September 12, 2018, 10:17:53 AM »
Thanks and all really helpful. I have the vengeance as the replacement and there is no comparison between that and the laser 2 so I might take this laser to a prop shop and see what they say, and if it can be replaced I will have it done as the new high performance props really are much more expensive here in the UK and we have an additional 30% whamo on the retail price due to import duties...

I'll take some photos and upload as soon as I get the work done so there is a reference for others  8)

Offline UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #15 on: September 24, 2018, 06:29:33 AM »
Looks like the tempest pro is indeed the correct replacement :)

I have another question based on all this, I have purchased a new lower unit but the gearing is different on the new mercury lower units, the old one for the v6 135 was 1.87 and the new ones are 2.01.

So my question is, in order to get the same performance as my old laser 2 21p RH do I need to change the prop pitch up or dawn? I was given some advice that I should go to a 23p if using the same type laser 2.

Can anyone advise if this is right as I have managed to locate a new old stock laser 2 23p.

Best
Mike

Offline Plugcheck

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Re: Merc Laser 2 21p prop hub identification
« Reply #16 on: September 24, 2018, 07:44:16 AM »
To maintain the overall drive ratio you would prop up.  The 23 would certainly be worthy of giving it a try.  Mathematically it can be calculated, but I'm afraid you'll still need to try various props to see what it's most happy with.
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 UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #17 on: September 24, 2018, 07:46:49 AM »
Thanks Michael, the 21p was perfect with the right amount of lift and speed, I wonder if I should get an borrowed prop to see if the 23 is right..... mm do you know the calculations needed to work it out or is there an online calculator that will hep work it out?

Offline Plugcheck

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Re: Merc Laser 2 21p prop hub identification
« Reply #18 on: September 24, 2018, 09:35:45 AM »
Many of the manufacturers websites have online prop calculators.
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 UKMike

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Re: Merc Laser 2 21p prop hub identification
« Reply #19 on: September 24, 2018, 10:38:10 AM »
Thanks again  8)