« previous next »
Pages: [1]   Go Down

Author Topic: OPOC - 4 Piston, Two Cylinder, Two Stroke  (Read 3292 times)

0 Members and 1 Guest are viewing this topic.

Offline Milwaukee Midget

  • Global Moderator
  • Hero Member
  • ***
  • Posts: 6663
    • Milwaukee Midget Racing
OPOC - 4 Piston, Two Cylinder, Two Stroke
« on: January 25, 2011, 02:16:44 PM »
Just had this sent to me by a buddy of mine.  Clever design, IMHO.

The link is a few years old, and I'm not sure where it stands, but I see Mr. Gates has sunk some capital into its development.

http://www.engineeringtv.com/video/Opposed-Piston-Opposed-Cylinder
Logged
"Problems are almost always a sign of progress."  Harold Bettes
Well, I guess we're making a LOT of progress . . .  :roll:

Offline k.h.

  • Sr. Member
  • ****
  • Posts: 565
Re: OPOC - 4 Piston, Two Cylinder, Two Stroke
« Reply #1 on: January 25, 2011, 02:49:08 PM »
A variation of the old German aircraft engine from WW Twice.  Probably  a DARPA project to run the A160 drone on diesel instead of a turbine.

Here's a "fire after TDC" unit that's been in the works for years.  

http://www.physorg.com/news/2011-01-split-cycle-efficient-traditional-combustion.html
Logged
In theory, there is no difference between theory and practice.  But in practice, there is.--Jan L. A. Van de Snepscheut

Offline RidgeRunner

  • Sr. Member
  • ****
  • Posts: 843
Re: OPOC - 4 Piston, Two Cylinder, Two Stroke
« Reply #2 on: January 26, 2011, 08:43:12 AM »
The OPOC is interesting.  Wonder how the linkage from the outboard pistons to the crank works out, it gets around one of the weaker points [IMHO] of the Fairbanks - Morse OP twin crank design, the vertical drive shaft drive between the 2 cranks.  Had to keep an eye on it when used in speed change applications, think they were better suited for constant speed stationary applications.

 FM's were used in WW11 era subs, DE's , seaplane tenders, and probably other ships.  Also used in Locomotives and for stationary power.

"fire after TDC" concept is also interesting, no experience with anything close to that, will be thinking that one over.

                 Ed
Logged

Offline Dean Los Angeles

  • Hero Member
  • *****
  • Posts: 2370
Re: OPOC - 4 Piston, Two Cylinder, Two Stroke
« Reply #3 on: February 06, 2011, 12:44:12 AM »
It could result in a lighter engine. I'm not sure there are any other benefits.

A two cycle only has to be 51% as efficient as a four stroke to produce more power.

Since there is no crankcase pumping it has to use an expensive electric assist turbo to get rolling.

The mass of the external rods would prevent any kind of high rpm.

Logged
Well, it used to be Los Angeles . . . 50 miles north of Fresno now.
Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.

Offline sockjohn

  • Sr. Member
  • ****
  • Posts: 364
Re: OPOC - 4 Piston, Two Cylinder, Two Stroke
« Reply #4 on: February 23, 2011, 06:58:58 PM »
Quote from: Dean Los Angeles on February 06, 2011, 12:44:12 AM
It could result in a lighter engine. I'm not sure there are any other benefits.

A two cycle only has to be 51% as efficient as a four stroke to produce more power.

Since there is no crankcase pumping it has to use an expensive electric assist turbo to get rolling.

The mass of the external rods would prevent any kind of high rpm.



I would think a direct injection two stroke would have the same advantages without the disadvantages, and is a commercially available and proven product.
Logged
Pages: [1]   Go Up
« previous next »