Opposed Piston Opposed Cylinder Engine

re: Opposed Piston Opposed Cylinder Engine

Kasey — Wed, 04 Nov 2009 13:09:42 GMT

It may be able to be timed to let one set of con rods work at the point of ignition with more leverage than normal? as in the Scuderi S/C engine

re: Opposed Piston Opposed Cylinder Engine

john — Wed, 21 Oct 2009 00:45:48 GMT

This engine is alot different, it solves alot of problems of normal 2 strokes. First of all your tubo is going to be more efficent , exhaust port open and charge air ports closed. Next, you can pressurise the cyclinder with the intake charge. And most important, Low amount of ring drag. To get the same amount of power with a 4 stroke, the amount of dead piston movement would be measure in feet..Detroit diesel stated that on their engine that just .5 inches longer stroke would kill efficiency.

re: Opposed Piston Opposed Cylinder Engine

RiCarGuy — Thu, 15 Oct 2009 15:38:38 GMT

I remember sketching an opposed piston engine in my 7th grade school notebook. The whole powertrain would fit inside the track of a snowmobile. Ahh memories.

Mr_fluffi, you are an Obama supporter, aren't you? Just an innocent question.

re: Opposed Piston Opposed Cylinder Engine

Michael Calistrat — Fri, 09 Oct 2009 15:41:30 GMT

I got my Master Degree in Internal combustion engines from the university of Romania in 1951. In the Laboratory we had almost the same engine, taken from a German airplane.

Theoretically (Rankin Cycle) a two stroke engine is not as efficient as a four stroke.

The weight of such an engine would be prohibitive; see that the outer piston has two connecting rods.

The examples of people trying to resucitate old (and failed) designs is quite long.

re: Opposed Piston Opposed Cylinder Engine

mr_fluffi — Tue, 01 Sep 2009 12:21:56 GMT

Why dont we spend all the money we are spending on this to end wars and thereby remove the need for new tech engines to power tanks

re: Opposed Piston Opposed Cylinder Engine

Don — Fri, 21 Aug 2009 03:59:33 GMT

Currently we have the A1 Abrams tank which is electric drive (like a diesel train) but with a turbine engine to turn the generator. (same as super fast trains in Europe & Japan) I have high hopes for a large improvement in fuel cell size and efficiencies to eliminate the need for fossil fuel burning engines. (like the Hinda) This looks promising as an interim time frame driver for the generator. It would be under constant loan and using the higher rpm capability to turn a generator and provide a constant flow of electricity to the main electric drive motors. That offers great fuel efficiency. It is simpler than a clutch & transmission drive.

re: Opposed Piston Opposed Cylinder Engine

Rob — Thu, 20 Aug 2009 08:00:44 GMT

WRONG Massey did this for trains, and placed in submarines

re: Opposed Piston Opposed Cylinder Engine

Don — Wed, 19 Aug 2009 18:52:41 GMT

Again nothing new. the Doxford engines and the B&W engines has this exact same layout with one crankshaft and one set of pistons with short connecting rods and the opposed pistons with t long set of connecting rods.

re: Opposed Piston Opposed Cylinder Engine

danny — Mon, 10 Aug 2009 02:43:58 GMT

please, don't suggest that subaru invented ANYTHING.

re: Opposed Piston Opposed Cylinder Engine

Preet — Tue, 04 Aug 2009 18:30:34 GMT

Im wrong actually

re: Opposed Piston Opposed Cylinder Engine

Preet — Mon, 03 Aug 2009 05:31:41 GMT

Is it just me or are the exhaust and intake ports both left open for a short period of time. I know direct injection doesn`t allow that, but when you see him turn the crank...you can see both ports open for a short time. I guess that makes it inefficient as unburnt fuel can espace through the exhaust port.

re: Opposed Piston Opposed Cylinder Engine

Douglas — Sat, 23 May 2009 11:26:34 GMT

Tucker's engine Patent #2184820 there is no development here. The DOD has Tucker's engines from the 1930's.

Also Levi ,Lee Bowman built for DOD radial form back in 1918.

And Pittman before that, for mining drill in the 1890's to balance torque.

I like the accent, it makes be feel like he is smart.

All that needs to be done is to bring back suppressed technologies and fund them with large backing.

By the way, DOD does not have emissions controls.

re: Opposed Piston Opposed Cylinder Engine

perkee — Fri, 15 May 2009 15:51:56 GMT

Great! I am waiting for the opoc medium for light aircraft applications.

re: Opposed Piston Opposed Cylinder Engine

Manousos — Thu, 07 May 2009 08:19:24 GMT

The external pistons of the OPOC engine do not touch the cylinder wall, only rings touch the cylinder.

This fact enables the cylinder being a little tapered/conical towards the combustion dead center CDC, thereby:

-nor the rings touch the ports and the port bridges any longer.

- the ring friction is reduced, rings seal only where necessary.

-the lubricant film needs not extend over the ports and

the bridges where, otherewise, will get burned

-the oil film on the bore has to serve only the rings.

-it seems that the uniflow/through-scavenging of the OPOC engine eliminates the gases flow problems of this tepered/conical cylinder

Will such a compression-release cycle reduce the longevity of the rings?

re: Opposed Piston Opposed Cylinder Engine

Deepwater — Tue, 31 Mar 2009 23:11:11 GMT

Napier Deltic engines were installed on a minesweeper I went on sea trials with. Started by cartridge, index and fired like a gun VERY LOUD. very powerful. No on board repairs. Repairs by replacement only.