A cheap but unreliable 300hp

[JamesM]

Most excelent

http://www.boatsandoutboards.co.uk/view/F50437/

 

[Taz]

Didnt even know they could make that much power, It wont be for long

 

[JamesM]

Dunno, buy it an find out dude

 

[Hydrostream]

Didnt even know they could make that much power, It wont be for long

With porting and some other slight mods a 2.4 can make 300hp and last quite long as long as it is one properly. 2.5L - 330Hp


By the way taz, were you looking for a 3.4 gearbox? I was thinking today about putting a bravo 3 box on an outboard, the 3.4 might have enough grunt to turn it!

 

[Jon Fuller]

I was thinking today about putting a bravo 3 box on an outboard, the 3.4 might have enough grunt to turn it!

Interesting! how would you shift? or are you thinking of a 'fixed in gear' set up.

 

[Taz]

All i want is a 20" mid section

 

[roofer]

taz why dont you ask hutchy,i know he has a full engine.

 

[Taz]

I know the earlier 300hp engines have the bullet box and short leg

 

[Hydrostream]

Johnson, It was just a thought I had today while I supposed to be working! I'd try it first with a fixed gearbox, there would be quite a bit of engineering to do to make it shift!

There is an old style bravo 3 box in the loft in work, missing a skeg but thats about it I think, an adapter plate could be fabbed quite easily and a driveshaft welded up to fit the ob, but I seriously doubt my 2.4 would turn it...

Thats when I thought a a 3.4 would fit the bill, would take advantage of the duoprops low slippage and the 3.4's torque and low rpm. Only drawback is the case is HUGE!

Anybody ever run one of mercs Duce High outboards, they were 2.0L I believe.

 

[Jon Fuller]

To make it shift, you'd have to introduce a F-N-R gearbox somewhere in the mid section.
It wouldn't be easy, as the only small, stand alone unit I can think of, is the volvo sterndrive one (unbolts from the top of an AQ drive in one small lump), but this, whilst very compact, and able to take 300 hp, is also a right angle drive, and obviously you'll need an 'in-line' affair.

Interesting idea tho'.

jf

 

[Hydrostream]

shifting

That's kind of along the lines of what I was thinking, I have a pair of old volvo 100B drives in the shed, but like you said they're a 90* box, realy nothing else springs to mind except maybe a hydraulic drive but there is a significant power loss through these, isn't there.

A clutch would be straight forward enough, to start the engine etc, but an inline reversable gearbox would be complicated.

Maybe use the cone type clutch for forward and nuetral and use a hydraulic for reverse.
Better yet use a hydraulic multi plate clutch like in the yamaha drives for forward and neutral and you already have the pump and valve for the hydraulic reverse system.

Still a lot of engineering though.....

 

[Taz]

Um what about a swivel mid section with a turntable so she turns 360 degrees no need for a gearbox

 

[Hydrostream]

Um what about a swivel mid section with a turntable so she turns 360 degrees no need for a gearbox

Or a cup that drops down like a jet drive

 

[Taz]

what about another engine on the front pull tied on