Just stumbled across this on the net, but you can see the developers work on the beetle engine in this design. Over 100mpg and twice the power of a conventional engine from a two stroke engine! Even has an electric version of a turbo/supercharger.

[img]http://image.automobilemag.com/f/31686174+w750+st0/0912_01_z+ecoMotors_OPOC+eM100_testing.jpg[/img]

[img]http://image.automobilemag.com/f/31686171+w750+st0/0912_02_z+ecoMotors_OPOC+eM100_testing.jpg[/img]



Here is the link
http://www.ecomotors.com/

those secondary connecting rods would be doing it tough. what's the rev range on that?

Pretty innovative and ingenious. and they are right on teh money with the fuel efficiency and power.

But they claim it to be a green engine, however don't highlight how the design overcomes the environmental concerns that are typical of a 2 stroke (oil/pollution/emissions)
Unless the whole green label is ignorant towards that and refers to the fuel consumption. I'm sure they would have looked into that though (emissions).

Does anyone have any more info about that?

Cool engine!

Allthough It will be pretty wide, I think.


It's roughly the same idea as this opposed piston two stroke diesel engine:







More here: Achates

bajachris88 most two stroke engines other then small ones like lawnmowers wiper snippers etc have a wet sump just like 4 stroke engines so they don't inject oil with the air fuel mix so no oil burning. i guess this engine would be the same.

This looks like a variation on the "Commer Knocker" arrangement. The Commer was a British made truck with a 2 stroke diesel engine that had 6 pistons, but 3 cylinders. (Might be able to get cheaper rego because there are only 3 cylinders!) The advantage is that the inlet is at the opposite end to the exhaust, so very little fresh charge escapes through the exhaust ports.The Commer engine had connecting rods that connected to levers that connected to the crankshaft. Not built for revs! There was a German truck engine which had a similar arrangement but with twin cranks connected by gears. Elegant but expensive.

a whole lot of parts for not a whole lot more power really. the sarich [orbital] 2 stroke is a much more efficient design parts wise. Remember, less moving parts is the key. That's why rotaries work so well. The SIDI holden motors are an offshoot of that stuff too. Direct injection petrol motors. The difference with the orbital design was that it used a supercharger to create inlet pressure. Zoom magazine did a write up on a bmw 3 series powered by one of the testbench orbital 6s and it was apparently very impressive. It wouldn't be hard to turn a VW 4 into a dry 2stroke. I've thought about it often enough. Half the parts are available from motorbikes. Then just make up some generic heads and throw on a supercharger. Once the SIDI technology takes off in other cars, fuel pumps and the like will be easy to come by and you could build a really hot flat four that's smaller and a lot revier.

Hi

I went to demonstration of new sort of motor in Sydneys west a few years ago, it was based on a Subaru flat 4, I think it was called Revertec or something similar. The people made all sorts of claims about power and effeiceincy, it looked similar to one Matara posted.

The motor used Haltec injection, coincidently Haltec now occupy the same building that Revertec were in .

Steve

I think the revertec had a scotch yoke setup with the pistons joined together.

if by that you mean that the opposing pistons move in the same direction at the same time then the answer is yes. Because the scotch yoke joins them together, as one goes out the other side must come in and vice versa. VW/Subaru boxers have a crank config that means the opposing pistons go opposite directions at the same time. Both out, then both in.

The Commer 'Knocker' earned its nickname from the dreadful knocking noise that the engine produced, especially when worn. You could hear them 'knocking' long before the exhaust was heard.