General Diesel Discussion Talk about general diesel engines (theory, etc.) If it's about diesel, and it doesn't fit anywhere else, then put it right in here.
Sponsored by:
Sponsored by:

What is a two stroke diesel?

Old 05-27-2005, 09:42 PM
  #1  
Registered User
Thread Starter
 
Join Date: Mar 2005
Location: North Jersey
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
What is a two stroke diesel?

I dunno if anyone remembers this part in the movie U571, but Matthew McCoune-whatever starts reminiscing about his father's fishing boat. He mentions that it had a noisy two stroke diesel. I've always wondered what in [Edit] it was, anyone want to give me the dime tour of how they work?
Badfish740 is offline  
Old 05-27-2005, 09:47 PM
  #2  
JKM
Registered User
 
JKM's Avatar
 
Join Date: Jun 2004
Location: SunnyVale Trailer Park
Posts: 1,668
Likes: 0
Received 0 Likes on 0 Posts
http://auto.howstuffworks.com/diesel-two-stroke.htm

that should explain it about as well as any of us can.
JKM is offline  
Old 05-27-2005, 10:04 PM
  #3  
Registered User
 
SjLingenfelter's Avatar
 
Join Date: Jan 2003
Location: Sugarland,College Station, Mason, TX
Posts: 1,113
Likes: 0
Received 0 Likes on 0 Posts
Cylinder diameter - 9-1/16 inches
Piston stroke - 10 inches
DISPLACEMENT PER CYLINDER - 654 CUBIC INCHES
Number of cylinders - 16 or 20
Compression ratio - 14.5:1
Exhaust valves per cylinder - 4
Engine weight -
16 cylinders: 34,526 pounds / 15,661 kg
20 cylinders: 40,144 pounds / 18,209 kg (The oil pan alone weighs over a ton!)
Idle speed - 315 rotations per minute (rpm)
Full speed - 900 rpm



That right there boys and girls is a biggin
SjLingenfelter is offline  
Old 05-27-2005, 10:12 PM
  #4  
Registered User
 
Haulin_in_Dixie's Avatar
 
Join Date: Nov 2001
Location: Branchville, Alabama
Posts: 4,199
Likes: 0
Received 0 Likes on 0 Posts
At one time most busses and half the truck were 2 stroke. The older Detroit engines were 2 stroke. The same rpm sounded like it was screaming. One power stroke for each time the piston comes up. Generally the piston comes up, the injector injects, the fuel is fired, the piston goes down till it uncovers ports that surround the piston liner for the air intake, the exhaust valves open, scaviging the cylinder, it goes up, the valves close and it all starts again. The Detroits had to have a Roots blower to run.
Haulin_in_Dixie is offline  
Old 05-27-2005, 10:19 PM
  #5  
Administrator
 
chaikwa's Avatar
 
Join Date: Jan 2004
Location: Kalamazoo, Michigan
Posts: 2,331
Likes: 0
Received 1 Like on 1 Post
In terms of trucks and small to mid-sized commercial fishing boats, 'two-stroke' GENERALLY refers to diesel engines that are two cycle instead of four cycle like our Cummins', and were manufactured by Detroit Diesel.

Detroit Diesel means loud, leaky, oil driping hunks of iron that are also suitable for use as boat anchors.

Detroit used to use letters and numbers in their engine series to determine leakage amounts and actual gross horsepower, ie; the 6-71 series denoted 6 horse power and 71 leaks. The 8V-71 designated 8 horse power, a 'vee' configuration motor (as opposed to an in-line), and 71 leaks.

Other than that, what Haulin_in_Dixie said above is also true.

Hope this helps!



chaikwa.
chaikwa is offline  
Old 05-27-2005, 10:36 PM
  #6  
Registered User
 
Join Date: Jan 2004
Location: Corpus Christi, Tx.
Posts: 372
Likes: 0
Received 0 Likes on 0 Posts
I can't remember what member on which CTD website originally said:
"Detroit Diesel engines... The worlds most efficient diesel at converting #2diesel fuel into NOISE!"

They are Dirt Simple engines that have their place... Some say on the end of an anchor chain, others still would love to put one in an old pickup truck just for that unique 2 stroke sound...

K.
SoTexRattler is offline  
Old 05-27-2005, 10:43 PM
  #7  
Registered User
 
bulabula's Avatar
 
Join Date: Feb 2002
Location: near BWI airport, MD
Posts: 2,238
Likes: 0
Received 0 Likes on 0 Posts
In my book, not many diesel engines sound better than a screaming DD. Especially those twin 16 cylinder engines in the bigger landing craft.

laugh]
bulabula is offline  
Old 05-27-2005, 10:58 PM
  #8  
Registered User
Thread Starter
 
Join Date: Mar 2005
Location: North Jersey
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Hehe...noise is cool, I want one.

Thanks guys
Badfish740 is offline  
Old 05-27-2005, 11:01 PM
  #9  
Registered User
 
Join Date: Dec 2004
Location: Vancouver, USA
Posts: 138
Likes: 0
Received 0 Likes on 0 Posts
Detriot has come a long way from the "screamin jimmy". Although the silver series 8V92 was a good engine, the inline sixes they use now in our big trucks run real good and are dependable. I have about 600K on the DD I drive.
V
Vulcan is offline  
Old 05-27-2005, 11:16 PM
  #10  
Registered User
 
Join Date: Jan 2004
Location: Corpus Christi, Tx.
Posts: 372
Likes: 0
Received 0 Likes on 0 Posts
Don't mistake 2cycle diesels with inefficiency and obsolescence..
Some of the truly most efficient modern diesels are HUGE 2 stroke slow RPM marine engines.

Even the WW-II Submarine engines were opposed piston, port scavenged, 2 stroke engines. Fairbanks-Morse and even GM made them, among others manufacturers.
http://www.maritime.org/fleetsub/diesel/chap1.htm
If you scroll down towards the bottom, you'll see some diagrams of the different types.

There's even a recently designed 2-stroke diesel light AIRCRAFT engine.. It uses a roots-type blower AND a turbocharger for performance at altitude. It'll get you back home if you lose one or the other but it won't start without the blower. The name escapes me right now, but it is a lot more efficient than the old flat 4 Lycomings and Continentals. 100LL avgas is still in the crosshairs of the enviro's for ultimate elimination... For a diesel aircraft engine, there's already high quality JET-A fuel available at most every decent FBO.

The EPA, treehuggers and high fuel costs have driven many of the 2cycle Detroits out of road service. MOst of the time when I see one now is in portable diesel powered oilfield equipment or hydroblasting pump rigs. LOUD!!
If you've ever heard one in an old semi pulling a load up a hill, you'll never forget the sound. Narrow torque band necessitated lots of gears to stay on the peak.

K.
SoTexRattler is offline  
Old 05-27-2005, 11:22 PM
  #11  
Registered User
 
upersleder's Avatar
 
Join Date: Jun 2004
Location: U.P. Mi.
Posts: 412
Likes: 0
Received 0 Likes on 0 Posts
we had one in our diesel shop at the tech center when i was in HS, had a big air starter on it, man that thing SCREAMED when you wound her up. i miss the sounds of them pulling on the highway too, tattler is right, never forget that sound.
upersleder is offline  
Old 05-27-2005, 11:38 PM
  #12  
Registered User
 
Join Date: Oct 2002
Location: Logan, Utah
Posts: 638
Likes: 0
Received 0 Likes on 0 Posts
Originally posted by SoTexRattler
There's even a recently designed 2-stroke diesel light AIRCRAFT engine.. It uses a roots-type blower AND a turbocharger for performance at altitude. It'll get you back home if you lose one or the other but it won't start without the blower. The name escapes me right now, but it is a lot more efficient than the old flat 4 Lycomings and Continentals. 100LL avgas is still in the crosshairs of the enviro's for ultimate elimination... For a diesel aircraft engine, there's already high quality JET-A fuel available at most every decent FBO.
I don't know if the specific engine you are referring to is the Thielert Turbo Diesel, but here is a very sexy airplane that is pending US certification that uses them. It is certified in Europe and is getting very good reviews.

http://www.diamond-air.at/Pressebild...T0085.jpg.html

183 Knots on 12.2 gallons per hour IN A TWIN???? Only with a diesel baby, ONLY with a diesel.
Nevada is offline  
Old 05-27-2005, 11:38 PM
  #13  
Registered User
 
Haulin_in_Dixie's Avatar
 
Join Date: Nov 2001
Location: Branchville, Alabama
Posts: 4,199
Likes: 0
Received 0 Likes on 0 Posts
Nothing sounds like a 12v71 in a day cab with dual stacks. 535 horse pulling 55 yards of wet beach sand. You bulk haulers figure the weight, you would not believe me if I told you.

The post said or indicated no power, I had a 6v92tta that would take any Cummins or Mack 350 up a hill gross loaded. No was not stock. It was high torque rise, 9 speed.

Put over 1,000,000 on a 238, 671 hauling gross loads, 48 states. Shifted a lot.
Haulin_in_Dixie is offline  
Old 05-28-2005, 01:29 AM
  #14  
Registered User
 
edwinsmith's Avatar
 
Join Date: Dec 2004
Location: Santa Ana, CA
Posts: 3,263
Received 573 Likes on 425 Posts
The only fault I found in the article is where it said a two stroke diesel must have a turbo or supercharger to run. There are two stroke model airplane engines which burn nitormethane and have glow plugs. They have no turbocharger. Instead they run the air/fuel mixture into the crankcase through a reed valve when the piston goes up. Then on the downstroke the mixture is compressed until the ports from the crankcase to the cylinder are uncovered then the fresh mixture is injected into the cylinder. At the same time the exhaust ports are uncovered to let out the burned exhaust. There is no reason why a regular diesel couldn't use the same mechanism but it probably wouldn't run nearly as well.

Those little glow plug engines really scream on nitro though.

Edwin
edwinsmith is offline  
Old 05-28-2005, 01:52 AM
  #15  
Registered User
 
Join Date: Jan 2004
Location: Corpus Christi, Tx.
Posts: 372
Likes: 0
Received 0 Likes on 0 Posts
Originally posted by Nevada
I don't know if the specific engine you are referring to is the Thielert Turbo Diesel,...
No, the one I was thinking of was the "DeltaHawk" diesel aircraft engine. I haven't kept up with its certification status. It is truly an original design of a 2 stroke liquid cooled, inverted V-4.
If I'm not mistaken, I think the Thielert is a very lightly modified Mercedes-Benz automotive 4stroke with a gear reduction prop drive unit added. Very good reports on that one!
The DeltaHawk has a smaller engine profile. Fewer parts count than a 4stroke engine...
Fits easier under Cessna's cowl than the original horiz opposed engines. The radiator mounting is what has to get creative.
Lots better fuel consumption than a comparable gasser.

Yeah! Diesel airplanes!!! Bring it ON!!

Just think, someone out there will figure out how to make their airplane SMOKE on takeoff! "Lets see, big injectors, slide this little plate forward, stuff this bigger turbo in here..."

K.
SoTexRattler is offline  

Thread Tools
Search this Thread
Quick Reply: What is a two stroke diesel?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.