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 Post subject: Flathead V12
PostPosted: Mon Jun 24, 2013 11:14 am 
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Location: PA, USA
Because I seem to believe you can just never have enough bizarre V12 engine in the shop I bought about a 1947 Lincoln flathead V12 :lol:


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 Post subject: Re: Flathead V12
PostPosted: Mon Jun 24, 2013 11:16 am 
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I found a set of cool looking finned alum heads castings for it...some machining required


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 Post subject: Re: Flathead V12
PostPosted: Mon Jun 24, 2013 11:19 am 
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The thing is a rusty gicky mess inside.....but nothing looks broken so that's something


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 Post subject: Re: Flathead V12
PostPosted: Mon Jun 24, 2013 11:36 am 
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This thing is 292ci and made 120hp at 3500 rpm and something like 200ft-torque with 180+ from 400-3500 rpm.

It's a 4 main bearing crank, not 7 like a modern V12 would be so I need ot keep the rev low....4000 to maybe 4500 max I guess.

My plan at the moment is:
good rods
good pistons
a little flow work
A little more cam (ok a lot more cam :lol: :) )
Blower!

To get to 250hp/300ft-lb and a crazy lot but enough for what I have in mind for it.....a wooden boat.

I had a 47 chris craft years ago but sold it to get something with better performance and practicality...but I mis it.

I'm thinking I want to build a boat and have had the plans sitting on the shelf for ...10 years now?

The goal is to have it look a lot like this:


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 Post subject: Re: Flathead V12
PostPosted: Mon Jun 24, 2013 11:24 pm 
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Sounds like a cool project.
You can call it "Markruiser MKI".

What are your plans for drive?
... prop under the v or something off the transom?

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My O5E candidate: 1982 Honda CX500TC motorcycle.


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 Post subject: Re: Flathead V12
PostPosted: Tue Jun 25, 2013 8:31 am 
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abecedarian wrote:

What are your plans for drive?
... prop under the v or something off the transom?


Straight inboard. The engine is in the middle of the boat, prop out the back at the end of a shaft about 6 ft long. This is the preferred setup for a ski boat and I like to ski :)

This setup makes the boat is more stable and the wake less speed sensitive. I need to get 250hp out of the engine to make it a decent ski boat...300hp would be nice but 250 will do I think.

This is a 292ci engine so I'm not asking for a lot of hp/ci but the crank is not very well supported so I need ot hold the redline to 4000-4500 I think if I want it reliable or I need to make a new crank with much bigger jounals to stiffen it up.....the easiest answer is hold the revs down and that's what I'm planning on.

boosted to 300 hp, which on a VERY mild build is about 6 psi boost it makes 400+ ft-lbs torque whci will do a most excellent job of popping a skier out of the water I think.


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 Post subject: Re: Flathead V12
PostPosted: Tue Jun 25, 2013 12:53 pm 
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I see a lot of new ski boats with a V drive and the screw just below the stern, so I thought I'd ask.

The prop is direct drive off the crankshaft, or will there be some sort of transmission in there? I assume it'll have a transmission to provide reverse. (duh)

If you had an automatic, you could use the 5634 to control shift solenoids based on RPM or whatever or push buttons on the controls- two buttons, one for up shift and another down shift, with a gear indicator on the panel. :)

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/me goes off to the corner feeling like Jerry Springer with a mullet.

My O5E candidate: 1982 Honda CX500TC motorcycle.


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 Post subject: Re: Flathead V12
PostPosted: Tue Jun 25, 2013 1:16 pm 
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They like V drive and such becasue it makes a more passenger friendly boat...but the good ski boats are conventional mid-engine inboard

http://www.nautique.com/models/ski-naut ... -open-bow/

Their is a simple F/N/R trans used, but it's manual shift since it's just select F/N/R and your done :)

I had a couple velvet drive trans sitting in the basement but the V12 is so long that would have been a problem with the from of the engine sitting too high.

I need to get my hands on one of these:
http://www.pcmengines.com/power-plus-transmissions/

which has a 9 degree angle built in so the engine sits pretty flat


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