Counter Rotating Lower

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For late 1960's early 1970 straight Six.. is there such a thing... toying with the idea of running twin 100's ( or 110 or 115 ) on a 21 checkmate thats has no power on it now... Strictly for laughs and cause these outboards are just so darn cheep to pick up and the hull is all solid as a rock due to a recent new transom, Coring and floor replacement :D

[Raceman]

I asked my retired Merc guru/historian the same question a couple of weeks ago. He said there were some prototype units, but believed that there were never any inline lefties released to the public.

I've been thinkin' about puttin' a pair of 1500XS's on a Comp Vector just for the helluvit, since I've got 'em layin' around. Looks like my only options will be to get Stecky to custom build one OR run a pair of Super Speedmasters. I think the Stecky option would be ULTRA expensive and then blades COULD be harder to find also. Speedmasters are lookin' better.

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I've been in Machining and Engineering A long time ... 30 years now.. There just may be a few people who would want these if a good retro fit was done right. I need to see a cross section of a V6 version and see how they handle this in current lowers. I'm sure its all about the right bearing selection and how its fit in the housing and other components... just can't be a hack job but not rocket science either.. :cool:

[Bruster]

First things first. Propellers. What's out there that's LH?
I suppose you could use some old brass 2 blade Quicksilver wheels. Anything else is likely going to be custom and expensive.

Speedmasters would look cool, but they would require plenty of inline power to get that boat in to the 70 + MPH range where propellers are available.


I think the Stecky option would be ULTRA expensive and then blades COULD be harder to find also. Speedmasters are lookin' better.


I've been in Machining and Engineering A long time ... 30 years now.. There just may be a few people who would want these if a good retro fit was done right. I need to see a cross section of a V6 version and see how they handle this in current lowers. I'm sure its all about the right bearing selection and how its fit in the housing and other components... just can't be a hack job but not rocket science either.. :cool:

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http://www.powercatboat.com/FGS-SSM/FGS-SSM.html

Has some details... and looks like it can get expensive fast

[blurredvision]

For the input !!.:thumbsup:... I think I'm going to start out buy running these both RH and just see how it behaves. Its not an effort to go fast.. its more about having a little fun with a different set -up ... Seems like the biggest issue will be heavy wheel torque and a pull to the port side at higher speeds. Thinking I can reduce the Wheel issue with a hydraulic steering system.. And work out the pull to port side with a combination of engine position and the taps on the lowers. At least I'll try this before I go down the road of Modifying a lower unit for LH

[delawarerick]

Can you lock a case in reverse? I think I have heard of that being done. Rick

[blurredvision]

Are not set up to see a heavy load in that direction and chew up the case internals fast...

[Raceman]

Steckbauer routinely machines V6 gears to go in inline 6 gear cases for the drag racers, so my thinking was that he could do the guts from a lefty V6 case into in inline one as well. Since I've never been in a lefty case I don't know how the thrust loads are distributed, or what the differences are in the bearing carriers, so the inline bearing carrier could be an expensive hurdle if it's not easily machinable to adapt. I'm satisfied that Stecky could do one, but I doubt that the bill would be for the faint hearted, since it's fairly easy to spend 3K on mod'n an XR6 to make it live for big power.

Bruce, as far as the blades for a SSM, I'd think a pair of inlines could push most boats on top with a pair of 15's. I usta' run one on my old Ally with 1:1 gears and a single 1500XS.

[Bruster]

I think with the older 115's or less it could be a strech to get a big 21' Checkmate over the hump with SSM's with any props, unless they were burried. With twin inline 150's a 21' Challenger will run mid 70's


For late 1960's early 1970 straight Six.. is there such a thing... toying with the idea of running twin 100's ( or 110 or 115 ) on a 21 checkmate thats has no power on it now... Strictly for laughs and cause these outboards are just so darn cheep to pick up and the hull is all solid as a rock due to a recent new transom, Coring and floor replacement :D



Bruce, as far as the blades for a SSM, I'd think a pair of inlines could push most boats on top with a pair of 15's. I usta' run one on my old Ally with 1:1 gears and a single 1500XS.

[Raceman]

I think with the older 115's or less it could be a strech to get a big 21' Checkmate over the hump with SSM's with any props, unless they were burried. With twin inline 150's a 21' Challenger will run mid 70's

I think you're right.......... even with 150's for that matter. I think I was so busy thinkin about twins and the project that I've been ponderin' that I missed the 21' Checkmate part.:o

[Bruster]

Let me help ya out. I'll come and get that Comp Vector and I'll put a couple 1500 XS motors on it with C/R SSM's. I think I could make that Vector rock.



I think you're right.......... even with 150's for that matter. I think I was so busy thinkin about twins and the project that I've been ponderin' that I missed the 21' Checkmate part.:o

This 21 Challenger ran in the high 70's with 150 and SSM's.

http://i34.tinypic.com/14v2r1s.jpg

....and this 22 Superboat ran low 80's with similar motors and SSM's.

http://i36.tinypic.com/14xdyiq.jpg

[magnum2.5]

here are a couple pics of old tunnel boats with twin twisters and twin omc's with merc lowers...pretty cool...we were at a party in JUPITER FL:cheers:185804

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[Bruster]

Ron Hill has some nice looking LH 14X 26 3 blade "Eagles" that could be hubbed for an inline... $500/copy

[blurredvision]

Good to know...

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After chatting with some of the gentlemen at Mercury Racing I discovered the the early 80's and late 70's for the matter have the 8 spline config on the drive shaft... for the V6's and will fit up to a straight 6... So I found a 8 spline lower lefty... 25" sadly but its a lefty.. now just need to see it if bolts right up or if I need an adapter plate made up... if I need an adapter made up the 25" may be a good thing... if it just bolts up then I'll have the shaft cut down and new splines cut... At this point I don't care if I can shift it... I'll just lock it in forward.... But I'm getting Closer ! I may even pursue putting cones on both lowers and bolting these up to a jack plate so I can dig them in to get over the hump and then bring them up after that... Still won't have power tilt but I guess you can't have everything:thumbsup:

[magnum2.5]

I got a sweet 20" MERC pre load 187-1 left hand gearcase has a bob's low water pic-up and nice skeg for $500.00 ...and a left hand 26p cleaver to go on it for $250.00 I have run inline cases on v/6's before they say the splines don't go in the crank as far, but never had a problem, never ran a larger case v/6 on an inline but I guess ut will work as well...call me if you are interested thanks DON 321-537-0905 price does not include shipping:) I take pay-pal

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I'm scraping the twin 115 hp plan and going with 150's.... A) because The 115s found a new home... and.. B) A lot of the input has been suggesting that would be a better plan.

[magnum2.5]

the v/6 motor has considerably more torque than an inline motor, should have no problem gettin that 21' checkmate on plane...now your talkin...we got a 21' checkmate to fly 78mph on a single 2.5 merc, upgraded to a 22' VELOCITY and now its running 80 mph on gps with a single 2.5 MERC ...good luck with your project sounds cool:cheers:

[blurredvision]

Regarding that Lefty lower

[magnum2.5]

pm sent... happy holiday...:cheers: