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Old 21-02-2012, 12:38 PM   #1
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Supercharged Outboard

Didn't finish my new boat yet but I have just thought about supercharging my engine.

At the moment it is 2008 Yamaha F250 TXR ( 3,3 Litre ) with solid motor mounts and Bob's nose cone.
I know that I can buy new 300 or 350 hp engine but it would be to easy

So I have this idea to put suprecharger in it and make around 400 hp

What do you think guys?
Did any of you did that?

Offcourse it is a plan for next winter. This year I will ride on stock engine but I need something to do for next winter

Mike
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Old 21-02-2012, 01:07 PM   #2
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I see why you've got that company name!
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Old 21-02-2012, 04:03 PM   #3
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Well you are not driving Bayliner either....
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Old 26-02-2012, 10:45 PM   #4
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Talking Additional thought

We have been throwing a few ideas like this around at work as I have a spare 200hp power head and we talked about turbos on 2 strokes the only reasons I can not think of it being benafical is that the intake fuel and air would be Pushed straight out the exhaust port also the heat issue.

Is there any reason why outboards aren't turbo As there are some conversions been done
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Old 26-02-2012, 11:02 PM   #5
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the ram air theory is the only thing to my knowledge that has been tried on 2 strokes....... mind you some sort of intercooler may be better to for this application?...... hmmmmmm theres a thought.
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Old 27-02-2012, 05:47 AM   #6
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Land & Sea had a turbocharger kit.

On the OMC V8 there were some supercharger installs in the states.
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Old 27-02-2012, 07:20 AM   #7
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Quote:
Originally Posted by Renegade View Post
the ram air theory is the only thing to my knowledge that has been tried on 2 strokes....... mind you some sort of intercooler may be better to for this application?...... hmmmmmm theres a thought.
I think Neil Holmes played with blown V6 mercs a few years back (ski racing)
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Old 28-03-2012, 06:54 PM   #8
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thinking a lot about it and I think that would be better to fit second engine or inboard one....
Turbo or Super charged engine would last for how long? 50 hours? And I will have to rebuild it.... rebuilding a 4 stroke is propably 2 times more expensive than 2 stroke at least when it comes to dirt bike it is almost 2 times more expensive

So fun idea but I think I pass

Cheers
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Old 29-03-2012, 04:26 PM   #9
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Turbochargers are common on snowmobile engines. Below is a picture of one that makes around 800 hp. Also attached is a picture of a turbocharged two stroke dragster. It would be hard to fit all the equipment under an outboard cowl, though. The basic principle is to use the turbine as the restriction to raise the exhaust back pressure. That keeps the compressor from blowing the charge out the exhaust.

A lot of research on supercharged two strokes was done by Sir Harry Ricardo and Rolls-Royce before and during World War II. The V 12 engine was called the Crecy. The concept wasn't as promising for aircraft as the jet engine and was dropped. Napier tried an extremely complex turbocompound two stroke, the Nomad, that was also a poor substitute for the gas turbine.

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Old 18-04-2012, 11:36 AM   #10
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another thing u must consider is that a turbo or supercharger will force the reeds open on a 2 stroke, i think the forced induction snowmobiles must use rotary valves, it would make more sense to turbo a four stroke but you would have to lower the compression ratio for any reasobable amount of boost and find some way of remapping it if its injected, It would be tight for space and if it was a v engine you would probably have to twin turbo otherwise the manifold would have rediculously long headers.. Theres alot to think about and alot of time and money to spend but i would love to see it done
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