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  #1  
Old 10-28-2006, 04:15 PM
seo seo is offline
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Diesel Trivia Quiz

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

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  #2  
Old 10-28-2006, 05:39 PM
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common on construction sites?

Quote:
Originally Posted by seo View Post
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?
Unless I miss my guess, this one is pretty commonplace on construction sites. Right?
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Old 10-28-2006, 05:47 PM
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Quote:
Originally Posted by seo View Post
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
2-cycle diesel. They are usually only used in huge industrial diesel engines.

http://auto.howstuffworks.com/diesel-two-stroke.htm
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  #4  
Old 10-28-2006, 05:56 PM
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Quote:
Originally Posted by seo View Post
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?
A clue for those that don't know....
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Diesel Trivia Quiz-fig1-08b.jpg  
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  #5  
Old 10-28-2006, 06:53 PM
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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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  #6  
Old 10-28-2006, 08:19 PM
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diesel pile drivers.
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  #7  
Old 10-28-2006, 09:56 PM
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what about those weird british triangle engines..
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  #8  
Old 10-28-2006, 10:04 PM
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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

Last edited by Dubyagee; 10-28-2006 at 10:14 PM.
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  #9  
Old 10-28-2006, 11:07 PM
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2-Stroke Diesels

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.

Last edited by estod; 10-28-2006 at 11:21 PM.
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  #10  
Old 10-28-2006, 11:14 PM
ForcedInduction
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The Detroit diesels are - or were - 2 stroke designs.
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."
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  #11  
Old 10-28-2006, 11:15 PM
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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.
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  #12  
Old 10-28-2006, 11:20 PM
Craig
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When you're ready to give up, check this link:

http://en.wikipedia.org/wiki/Napier_Deltic
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  #13  
Old 10-29-2006, 12:31 AM
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Quote:
Originally Posted by F18 View Post
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...
I would love to get my hands on one of those.
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  #14  
Old 10-29-2006, 05:26 AM
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There are many.....

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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  #15  
Old 10-29-2006, 12:35 PM
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Originally Posted by Shorebilly View Post
are you aware that the pistons and rods can be removed from the side of the engines, via ports designed for the purpose????
Oh yeah. Unlike modern car/truck engines, they are designed with quick service/overhaul in mind.

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