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Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

Article about Boyesons development work HERE...

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    Default Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Article about Boyesons development work HERE
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Nice one - it's about time someone had a serious go at cleaning up the two stroke motor.

    Then maybe we can have proper bikes back in MotoGP instead of this VFR800 cup nonsense.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    this is relevant to my interests.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    The problem with strokers is that they will still waste oil regardless of how clean they are. Can't see how they will ever be efficient.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by Danny_Two View Post
    The problem with strokers is that they will still waste oil regardless of how clean they are. Can't see how they will ever be efficient.
    Perhaps I've misunderstood then - I thought the whole point of the direct injection design was to enable the separation of oil and fuel, so that they *don't* waste oil.......
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by stoo View Post
    Perhaps I've misunderstood then - I thought the whole point of the direct injection design was to enable the separation of oil and fuel, so that they *don't* waste oil.......
    You still need oil to lubricate the piston don't you?
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by Danny_Two View Post
    You still need oil to lubricate the piston don't you?
    Yeah - I figured there'd have been a way to keep the oil separate and underneath the piston though, but having looked at the skidoo e-tec site it's a lot clearer that that's not what they're about. Guess I just hadn't thought it through properly.

    That said - If they can make the petrol/oil mix burn efficiently, then the oil *isn't* really being wasted - it's just being used as fuel. Or have I got that arse about face as well?
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    I think that's what they are going for, the most fuel efficient and clean burning stroker, but you will still need to burn off oil to lubricate, maybe a lot less than before, but still burn oil.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by Danny_Two View Post
    I think that's what they are going for, the most fuel efficient and clean burning stroker, but you will still need to burn off oil to lubricate, maybe a lot less than before, but still burn oil.
    As long as it doesn't produce to much polution what difference does it make if it burns oil or petrol or both?
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by Danny_Two View Post
    I think that's what they are going for, the most fuel efficient and clean burning stroker, but you will still need to burn off oil to lubricate, maybe a lot less than before, but still burn oil.
    With the Boyseen engine you would as it has transfer ports, but if you use a charging cylinder it can be lubricated like a 4 stroke, this type of 2 stroke is generally known as a supercharged 2 stroke, some 2 stroke diesels on ships work like this.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Some manufacturers have made great strides in the boating industry with regard to two stroke technonlogy.

    We changed a four stroke 225hp Honda outboard for a two stroke 250hp Evinrude Etec on a boat a couple of years ago. Not only did the two stroke weigh 55 kilos less than the 4 stroke but it used less fuel at all throttle openings due to the clean burn technology. The lack of weight clearly also helped there.

    With regard to emissions, the way they look at them in the USA for marine applications is to take the "whole of cycle" cost in to account. So the amount of oil burned by the 2 stroke is roughly equivalent to the environmental impact of disposing of the sump oil at service time for the 4 stroke. Therefore the 2 stroke is not considered "dirty" any more.

    I'm sure there is a future for 2 strokes in motorcycling if this is anything to go by.

    Oh, BTW the sound of a 250hp V6 2 stroke is simply stunning
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by IanB View Post
    Oh, BTW the sound of a 250hp V6 2 stroke is simply stunning
    I remember seeing a picture of a drag bike with a V6 boat engine, it must of been 20 years ago though
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Why does a 2-stroke need oil mixed into the charge? Surely it would be feasible to lubricate the moving parts in the same way as a 4-stroke?
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Unless I've missed something, seems to me the only "innovation" here is an exhaust 'chopper' valve.

    Hasn't this been done before?

    An Aussie company, Orbital, have been making direct injection 2 strokes for ages now and the technology is used by several manufacturers already, including Aprilia.
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    Default Re: Clean Two-Stroke Engines - Boyesen Reinvents the Two-Stroke?

    Quote Originally Posted by Discharge View Post
    Why does a 2-stroke need oil mixed into the charge? Surely it would be feasible to lubricate the moving parts in the same way as a 4-stroke?
    No. The fuel/oil mixture is injected into the crankcase so does the bottom end lubrication. Remember there are no moving parts in the top end of the motor.

    Animated Engines Two Stroke Cycle

    Animated Engines
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