Sternpower drive

[1homeblown]

Looking for some education. Pops DiMarco has a 1979 DiMarco with a Sternpower outdrive (same style drive as in the picture). I am looking for information regarding props and size of the propshaft and if this sternpower drive shares the same dimension shaft/splines as a Speedmaster.
Any information is appreciated. We have 3 or 4 props like the one in the pictures and am trying to find out more info regarding the stampings as well.
Again, thanks for any information.

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[bjf66]

I’m sure stern power drives use same prop spline as 19 spline Arneson and ssm3 drive whether they be 4” or 6” hub

I have pair (L&R) 3 blade bronze 16.5”x22” if your interested


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[1homeblown]

Thanks for the info but not looking to buy. Just trying to educate myself with what my Dad has in the garage. [emoji1360][emoji1360]


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[bjf66]

Post a pic of back of prop


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[1homeblown]

Post a pic of back of prop


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I’ll snap a pic tomorrow. I forgot to do it while I was over there.
I know that’s it’s tapered.


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[bjf66]

Yes I’m fairly sure it’s same
I have a few pics of the Arneson 19 spline props you can compare

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[1homeblown]

Yes I’m fairly sure it’s same
I have a few pics of the Arneson 19 spline props you can compare
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Yep. The hubs look identical to what you have. Only difference is that all of ours are cleaver style props. Thanks for the information and pictures. [emoji1360][emoji1360][emoji1360]


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[bjf66]

Yes they all the same I have bunch of the Arneson 19 spline props here it looks like a burial ground only difference had a tidy up and went through to see what I had

I pulled the Arneson from transom as cleaning up last fibreglassing before paint
So measure the largest part of shaft where oil seal is as this is largest part of taper on back of prop and took a pic for you
Good luck
Brett

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[1homeblown]

Very cool. Thanks for that information. It’s exactly the kind of info I was looking for on the forum. I’ll measure it up next time at Pops house. [emoji1360]


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[Blownbillybob]

Yes the spline is the same as Arneson or 3A

looks like u have left hand output. Which was stronger then right hand!!

would like to see pics of ur set up!!!

I have several Stern Powr drives. And know a lot about these drives !!

how deep is it below the bottom !!

 

[Blackmagic94]

Yes they all the same I have bunch of the Arneson 19 spline props here it looks like a burial ground only difference had a tidy up and went through to see what I had

I pulled the Arneson from transom as cleaning up last fibreglassing before paint
So measure the largest part of shaft where oil seal is as this is largest part of taper on back of prop and took a pic for you
Good luck
Brett
View attachment 977114
View attachment 977115


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You got any small shaft SSM #3 props. I would like another pair as I currently have 3 blade 28s.

 

[1homeblown]

Yes the spline is the same as Arneson or 3A

looks like u have left hand output. Which was stronger then right hand!!

would like to see pics of ur set up!!!

I have several Stern Powr drives. And know a lot about these drives !!

how deep is it below the bottom !!

I’ll dig thru my pics and see if I can find some The drive is pretty deep. It’s on a 21’ DiMarco daycruiser...


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[Blownbillybob]

I’ll dig thru my pics and see if I can find some The drive is pretty deep. It’s on a 21’ DiMarco daycruiser...


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What do u have for power and what do u expect out of it for mph
How deep do u think it is. 4-6 inches under the bottom ??

 

[1homeblown]

What do u have for power and what do u expect out of it for mph
How deep do u think it is. 4-6 inches under the bottom ??

Not looking to change it up. It’s got a big round ear prop on it now. Mild 454 with maybe 450 hp. We have at least 4 of those cleaver props of varying sizes in the garage. The round ear prop works way better with the smaller HP. It’s had all kinds of engines in it....blown, twin turbo and now a mild N/A BBC. I haven’t found any pictures of the drive yet but I’m still looking.


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[Blownbillybob]

Is the boat white and burgandy

 

[1homeblown]

No. Yellow and wood grain.

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[1homeblown]

Yes the spline is the same as Arneson or 3A

looks like u have left hand output. Which was stronger then right hand!!

would like to see pics of ur set up!!!

I have several Stern Powr drives. And know a lot about these drives !!

how deep is it below the bottom !!

Who do you source parts from for these drives? I gotta replace the bellows minimally this winter.
Thanks!


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[Nailhead]

My dad built this Centurion at the Dimarco shop. Ralph was recommending the stern power over the mercruiser back then Saying it was the same as a speed master 3. Your Dimarco and this boat were built at the same time Right next to each other. had a twin turbo BBC in it with about 600hp And a turbo 400 trans. Had to put the steering rams on it later after we found out it would turn violently to the left at speed on it own. Our props were all cleavers. When we sold the boat in 1983 the guy used it once and then it got stolen. He got it back without the engine and trans. It’s been sitting ever since.

 

[1homeblown]

My dad built this Centurion at the Dimarco shop. Ralph was recommending the stern power over the mercruiser back then Saying it was the same as a speed master 3. Your Dimarco and this boat were built at the same time Right next to each other. had a twin turbo BBC in it with about 600hp And a turbo 400 trans. Had to put the steering rams on it later after we found out it would turn violently to the left at speed on it own. Our props were all cleavers. When we sold the boat in 1983 the guy used it once and then it got stolen. He got it back without the engine and trans. It’s been sitting ever since. View attachment 1027490 View attachment 1027489

Wow that thing is cool!!!


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[Nailhead]

Wow that thing is cool!!!


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I keep thinking about buying it, it pops up for sale every so often. I looked at it about 20 years ago and the interior was still there, now it needs stringers along with interior. Somebody is selling it on Facebook marketplace for $3000

 

[1homeblown]

I keep thinking about buying it, it pops up for sale every so often. I looked at it about 20 years ago and the interior was still there, now it needs stringers along with interior. Somebody is selling it on Facebook marketplace for $3000

I like it. It has some soul to it. And that drive is built like a tank. It’s had it all in it at one time or another. Blown, nitrous and twin turbos at one point. [emoji1360]


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[Blownbillybob]

Who do you source parts from for these drives? I gotta replace the bellows minimally this winter.
Thanks!


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Lancing marine. UK. Jus got some parts from them!!! Got them in a week !!!
there on FB also !!!

 

[1homeblown]

Lancing marine. UK. Jus got some parts from them!!! Got them in a week !!!
there on FB also !!!

Very cool. Gonna look them up now. Thanks for the info!


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[Blownbillybob]

Hey guys I jus started a Facebook page for these drives !! Please come and join !!!
Stern Powr drives !!!

 

[Blownbillybob]

My dad built this Centurion at the Dimarco shop. Ralph was recommending the stern power over the mercruiser back then Saying it was the same as a speed master 3. Your Dimarco and this boat were built at the same time Right next to each other. had a twin turbo BBC in it with about 600hp And a turbo 400 trans. Had to put the steering rams on it later after we found out it would turn violently to the left at speed on it own. Our props were all cleavers. When we sold the boat in 1983 the guy used it once and then it got stolen. He got it back without the engine and trans. It’s been sitting ever since. View attachment 1027490 View attachment 1027489

that’s KOOL !!! Who is selling it ????

 

[1homeblown]

Hey guys I jus started a Facebook page for these drives !! Please come and join !!!
Stern Powr drives !!!

Just requested on FB. And just so I’m correct, that’s a 107 model on the main page?


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[Nailhead]

that’s KOOL !!! Who is selling it ????

I don’t know the guy but it says it’s in Van Nuys

 

[Blownbillybob]

Just requested on FB. And just so I’m correct, that’s a 107 model on the main page?


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Yes. Late model 107 with 4 bolt bearing cap on lower!!

 

[1homeblown]

Yes. Late model 107 with 4 bolt bearing cap on lower!!

Ok. I gotta get good pictures of my Pops. Thanks for the info!


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[guest hs]

Got to be the ugliest outdrives on the planet! What a waste of a good Centurion

 

[drkprince13]

Is the boat white and burgandy
View attachment 978567 View attachment 978568

You mean this white and burgundy one? been a work in progress its on its 2nd motor- 509ci with a little 177 and intercooler. The sternpowr has been trouble free, changed the fluid in it when i bought the boat and hasnt had an issue. My pops had a machinist friend cut a mercury hub so it can take standard mercury prop now. the Hub is permemeantly mounted to the splines and we just slide the prop off and on. havent run it yet all out with new engine and prop combo. but should be good for 70-75mph. Behind the sternpowr is a velvet drive, been super reliable as well.

 

[[email protected]]

Yes the spline is the same as Arneson or 3A

looks like u have left hand output. Which was stronger then right hand!!

would like to see pics of ur set up!!!

I have several Stern Powr drives. And know a lot about these drives !!

how deep is it below the bottom !!

looking for a 28pitch for my sternpower, anyone have a 28 or 30 ?

 

[Blownbillybob]

looking for a 28pitch for my sternpower, anyone have a 28 or 30 ?

How is the boat running ??
U find a prop yet ??