Yachting Monthly's oil-burning four-stroke?

[Heckler]

Regardless of engines etc. how can even the magazine industry be on February already!?

Hmm, Im just writing my March PBO copy!
Stu

 

[Marsupial]

4 stroke with 2 stoke lub

Yes its a bit of a puzzle, but thinking about it I suppose you could feed an air/fuel/oil mixture into the crankcase then extract it (from the rocker cover maybe to ensure the mix gets everywhere) via a throttle mechanism to the inlet manifold. A four stroke engine lubricated like a 2 stoke and for all practical purposes a dry sump.

ingenious

 

[penfold]

Yes its a bit of a puzzle, but thinking about it I suppose you could feed an air/fuel/oil mixture into the crankcase then extract it (from the rocker cover maybe to ensure the mix gets everywhere) via a throttle mechanism to the inlet manifold. A four stroke engine lubricated like a 2 stoke and for all practical purposes a dry sump.

ingenious

That's exactly how this works; the carburretor is a conventional one with a throttle; the fuel/oil/air mixture leaves the carb and is sucked through a reed valve into the crankcase by the vacuum created by the rising piston and lubricates that which needs lubriction; the falling piston expells the F/O/A mix through another reed valve into a manifold that directs it to the cylinderhead and the inlet valve. From there everything proceeds as per a 4 stroke.

 

[snooks]

That's exactly how this works; the carburretor is a conventional one with a throttle; the fuel/oil/air mixture leaves the carb and is sucked through a reed valve into the crankcase by the vacuum created by the rising piston and lubricates that which needs lubriction; the falling piston expells the F/O/A mix through another reed valve into a manifold that directs it to the cylinderhead and the inlet valve. From there everything proceeds as per a 4 stroke.

So....
Does that mean the oil is mixed with the petrol before passing to the carburettor?

And YM was right?

Shurely shome mishtake?

Pete

Fortunately, I suspect journalistic cockup instead.

I suspect it's a case of someone writing about something which they have no understanding of.

 

[vyv_cox]

The engine is exactly as described in YM. Hardly news though, PBO tested it in April 2010. http://issuu.com/parsun/docs/practical-boat-owner-f2.6hp-2010

 

[Simondjuk]

So....
Does that mean the oil is mixed with the petrol before passing to the carburettor?

And YM was right?

So it works as I deduced and suggested solely from the scant information on this thread. The article, on the other hand, seems only to have served to confuse even technically savvy folk such as prv. So either written by someone who doesn't understand what they're writing about well enough to provide a clear and understandable explanation, or who simply can't be bothered to do so. Otherwise, saving perhaps the most technically inept, those who read it would have got it.