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Old 11-27-2007, 05:20 PM   #21
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Google 'Junkers Jumo 208 aircraft engines.' This opposed-piston diesel was used on the Hindenberg and in Junkers high-altitude recon planes in World War II.

In engines, there is little new under the sun.
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Old 11-29-2007, 03:49 PM   #22
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More on the old Junkers Jumo 205

http://www.geocities.com/hjunkers/ju_jumo205_m1.htm

http://www.iet.auc.dk/sec2/junkers.htm

The Graf Spee ran on nine-cylinder two-stroke opposed-piston MAN diesel engines.

Fairbanks-Morse still makes opposed-piston diesels

http://www.fairbanksmorse.com/engine...rine_power.php

Opposed-piston engines must be two-stroke engines because they have no place for valves.

Two-stroke engines are generally very dirty (in terms of particulate and unburned hydrocarbons), but they are very tolerant of fuel quality. EPA emission regs have essentially killed the two-stroke engine in the US outside of locomotive and ship engines. Fairbanks-Morse engines are said to be able to run any fuel even sort of oily. The only thing that defeats a F-M is aviation gasoline. The Germans have even run opposed piston diesels on a oil-coal slurry. Being two-strokes, they can be very light for their power output.

Opposed-piston engines are seductive to nations with limited manufacturing capability because they have no high-precision valves. The Junkers Jumo had fourteen main bearings (easy to make) and no valves. A V-12 EMD two stroker has 48 valves and seven main bearings.
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2000 Ford F-350 Super Cab Pickup
4x2, 6 speed manual
Regeared to 3.08:1
4 inch suspension slam
Aero mods: "Fastback" fairing and rugged air dam and side skirts
Stock MPG: 19
Summer MPG: 27.0
Winter MPG: 24
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Old 11-30-2007, 05:36 AM   #23
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Never say never

Quote:
Originally Posted by Big Dave View Post
Opposed-piston engines must be two-stroke engines because they have no place for valves.
I hadn't considered that possibility until you posted that it was not possible. So, just to be contrary: Move the ports closer to TDC, put an intake valve in one of the ports, put an exhaust valve in another. Ta-Daah! a valved, opposed piston, four stroke.
No? Why not?
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Old 11-30-2007, 07:50 AM   #24
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Quote:
Originally Posted by Big Dave View Post
Opposed-piston engines are seductive to nations with limited manufacturing capability because they have no high-precision valves. The Junkers Jumo had fourteen main bearings (easy to make) and no valves. A V-12 EMD two stroker has 48 valves and seven main bearings.
Opposed piston engines have better surface area to displacement ratios, meaning that they lose less energy to coolant, for a given displacement.
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