I know this is supposed to be a results-oriented forum, but thought this might be of interest to people who like diesels.
Q: There is an industrial diesel in pretty common use that has NO VALVES. No intake valves, no exhaust valves. How do they work this?

In the interests of sport, if you happen to know the engine I'm referring to, please don't just post the make and model, and spoil the opportunity for mental exertion on the part of others...
seo

Unless I miss my guess, this one is pretty commonplace on construction sites. Right?

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.

2-cycle diesel. They are usually only used in huge industrial diesel engines.

http://auto.howstuffworks.com/diesel-two-stroke.htm

A clue for those that don't know....

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Valve-less diesel engines were also used in hobby applications. Specifically "free-flight" model airplanes in the 40's and 50's. They looked like the nitro model airplane engines but ran on diesel. You had to heat the head first with a blow torch and then spin the propeller to get them started. My dad had one...

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FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K

diesel pile drivers.

what about those weird british triangle engines..

I wonder if a rotary diesel is possible or exists.


edit: looks like google splains it

http://www.smartplugs.com/engines/rotary/singlerotary.htm

or this strange one

http://www.jalopnik.com/cars/gadgets/new-rotary-diesel-engine-shows-promise-for-automotive-applications-121142.php

The Detroit diesels are - or were - 2 stroke designs. The 671, a very popular truck and at the time, possibly the most popular marine diesel, was a 2 stroke, and I assume the others (471, 1271) in that time period were, too. I drove military boats with 671s (the nomenclature means 6 cyl, 71 cubic inches per cylinder), and the big boat I served on had two 12-71s for motive power and two 4-71s driving generators.

The article linked-to in this thread on 2 cycle diesels said they have to be turbo or supercharged ..... our 12-71s were supercharged, but I believe the 471s were not, nor do I think the 671s were, in either marine or truck applications. I drove a 1966 GMC tractor (as in tractor-trailer) with a 671, and I think I would have known had it been turbo or supercharged.

Correct, BUT they still have 4 exhaust valves per cylinder.

"There is an industrial diesel in pretty common use that has NO VALVES. No intake valves, no exhaust valves."

It's really not much different from a two-stroke cycle gasoline engine, but they tend to use a blower to injest air rather than sucking through the crankcase. Simpler in one respect (no separate crankcase sections) and more complex in another (required blower).

I rode a two-stroke cycle 750cc motorcycle in the seventies, and it was a blast. I recall someone in a Quicky-Mart (TM) parking lot telling me that I needed new rings, because of the blue smoke.

When you're ready to give up, check this link:

http://en.wikipedia.org/wiki/Napier_Deltic

I would love to get my hands on one of those.

G'mornin' Folks,

There are many manufacturers of "Loop Scavenged" 2 stroke Diesel Engines, world wide.....

Slow Speed???
Medium Speed?
High Speed??

Country of origin??

the photos in one of the posts, looked like Fairbanks Morse....opposed piston engines....did not open the photos to check.....however have opened a couple of those engines in my past life.....if Fairbanks is what you are referring to......are you aware that the pistons and rods can be removed from the side of the engines, via ports designed for the purpose????

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

Oh yeah. Unlike modern car/truck engines, they are designed with quick service/overhaul in mind.