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What is a two stroke diesel?

Old 06-01-2005, 05:44 AM
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Ahhhhhhhhh...........Much better. Exactly what i was looking for Thanks alot guys!!
http://www.telusplanet.net/public/ryq/6V-53_on_dyno.mp3
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Old 06-01-2005, 10:19 PM
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Many moons ago in another life while I was bumbing my way around the world I worked on a 10,000 ton Danish ship for a while. This ship had a single 7 cylinder two stroke blown diesel engine. Max RPM was something like 600 RPM. Each piston weighed one ton. Each cylinder had one exhaust valve and no intake valve. I could just barely carry one valve over my shoulder by myself. The engine was shut down and started on diesel but ran on heated bunker oil. Starting was by huge ammounts of compressed air. The exhaust valve spring for each cylinder was exposed and at cruise rpm I counted the valve opening and closing once a second.
The engine was direct coupled to the prop. Engine direction was changed by thowing one huge lever in the opposite direction which changed the timing of the fuel pump and I forget what else.
Each cylinder had it's own cylinder head. Can't remember how many nuts held each head down but there were about 8 nuts of about 5 inches across the flats. The wrench to remove/install each nut was about 3 feet long with a huge lump at the opposite end to the nut side. A 14 pound hammer was used to strike this lump to loosen or tighten each nut.
Once I had the job of measuring the cylinder bore using a mic with a looooong extension. But first I had to drop a ladder down the cylinder to climb down and stand on top of the piston. Cylinder bore was about 5 feet. Another time I had to remove a piston with just one helper who could not talk English. This is an easier job than taking a piston out one of our engines. Just remove one cylinder head, bolt a big plate on the top of the piston, disconnect the rod by climbing INSIDE the block, hook up the overhead gantry and haul away.
Sorry, but I do not remember the HP or other specs of this engine. I do remember that it was about three stories high. It was an interesting engine and job.
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Old 10-23-2005, 01:20 PM
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Here are some sound clips on a 12v92 DD! http://www.bandagbullet.com/dvd.htm
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Old 10-23-2005, 01:24 PM
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Old 10-23-2005, 02:42 PM
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Originally Posted by SjLingenfelter
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
YEP they sure are. We got three of them here at work. 20 cylinder and over 3600 HP. But at 40,000 pounds they are a little slow outta the hole Big weed eater motors. Ten barrel oil changes are pricey
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Old 10-23-2005, 04:50 PM
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Originally Posted by nickleinonen

emd 2 cycles i work on daily [645v 12-20 cylinders, 710v 16 cylinders, and i think we have 1 or 2 567v12 kicking around]...
I used to work on a trio of EMD 16-567E1DF's. Dead simple to work on. The head's are all individual. held down with 4 crab nut's. If memory serve's me right the torque was something like 3,600 ftlb on those nuts. Maybe more, it's been a few years now since I've seen them. These unit's were dual fuel engines. Start them and run them on straight diesel or start them on diesel and switch them to fuel gas. This could be done at full load. They still injected a small amount of diesel on Fuel gas for firing purposes. They came from the factory like that. Not to many where built like that. Those fork/blade rod's and cranks are HE-- for stout. These engine's are basically big overgrown DD's. Sound like a train on the siding throttling up. Our's weren't turbo's. I loved them. You definitely needed double hearing protection in the engine room. Had silencers on the air intakes, they pulled so much air in that they really screamed. EMD actually build's some 4-strokes now, I think they are the H - series.
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Old 10-23-2005, 05:01 PM
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about 15 years ago there was a guy running around here in the central KA with a Chevy 2500 4X4 , he had put a 6V-53 in the truck and fab up twin turbo's to it , it also had 5 and 4 browning set-up , back then he pulled a large trailer and had no problems going up Donner in that thing. sounded even sweeter , now for sounds , there is nothing like a Cummins ISX Signature 600 with twin 8 in stacks pulling 575 h.p. to the wheels in the dyno room. now that is sweet
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Old 10-23-2005, 07:12 PM
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Two-stroke diesels are pretty common in sport fishing boats.

As a matter of clarification for some, two-stroke does not mean two-cycle. Nor does four-stroke mean four-cycle. Actually, a two-stroke engine is one- cycle and a four-stroke is really two-cycles. We just got in the habit of saying cycle instead of stroke which is not the same. Now that I've insulted you old pros........
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Old 10-23-2005, 07:21 PM
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My father once built a custom truck...old Diamond T log truck cab on a Chevy 3/4 or 1 ton chassis. He had a small Detroit in it for a while with dual stacks. That thing SCREAMED!!! Not power wise, although it did pull very well also, but the sound was awesome. I was just a little kid, but I could hear him downshifting where the speed limit dropped a half mile from our house.

Jim
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Old 10-25-2005, 12:53 PM
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Originally Posted by rebal
Dont forget that detroits will run backwards too. ask me how i know
LOL! Let me guess; stalled it pulling up a steep ramp out of an excavation hole, and rolled back still in gear?

Mack Maxidynes run backwards too!
Looks funny with exhaust smoke coming out the air filter canister by the hood!
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Old 10-25-2005, 01:13 PM
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Had two 225 horse 6-71 surplus diesels in a 56 footer. WOT 2300 RPM sounded like it was flying. 12 knots. Johnson and Towers has taken that same design to 475 horsepower and Viiking used them in there yachts in the late eighties. Hatteris Yachts used DD,s forever. 6-71's, 6v-53's etc. All two stroke weed eater engines. But say what you will. they are like the old Harley engines. If they got oil and gas they run. They leak and they externally lube. The US Gov. had a million of them.
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Old 10-25-2005, 01:24 PM
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Many moons ago I drove a White Road Boss II with a 238 hp 6-71 Detroit and a 10 spd. Roadranger. That truck made some sweet music stroking up and down thru the gears on the hilly New England secondary roads. She was able to keep right up loaded with the rest of the fleet, which were Mack U model 5 spd. 235 hp Maxidynes.
Must have been all the gears...

A few years later I was driving a Marmon cabover with a 318 hp 8-71 Detroit and a 13 spd Roadranger, hauling fresh swinging beef from midwest packing houses back to the NY/New England area. The company I was leased to (Distributors Service Co) was transitioning from 12'6" trailers to 13'6" trailers (and pre-cut boxed meat), and that 318 had a very tough time running loaded in 13th OD with the taller trailers.
That was back when the Cummins NTC-350 was top dog for over the road power.

The bumblebee like sound of a Detroit Diesel working thru the gears off in the distance is music lost to today's generations...
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Old 10-29-2005, 07:29 AM
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My boat has 2-stroke diesel engines in it. (2)each EMD V16 E645's. 3800hp;
swinging (2) 5 bladed wheels (propellers) 105"dia.
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Old 10-29-2005, 10:30 AM
  #44  
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Originally Posted by rebal
Dont forget that detroits will run backwards too. ask me how i know
Yes they will! And you can also hook detroits in series and make them bigger. Like taking two 6v71's and getting a 12v71, i've seen that done once.
matt
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Old 10-30-2005, 06:58 PM
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Originally Posted by Blue3quarter
Yes they will! And you can also hook detroits in series and make them bigger. Like taking two 6v71's and getting a 12v71, i've seen that done once.
matt
Actuall a 12v92 which can be purchased for a vehicle (used to) is two v6 engines bolted together nose to nose. The crank even bolts together in the middle. Two chargers, two turbo's. About 650 hp and mounted in an extended nose KW, makes a formidable road truck. There were a half dozen at Eagle Motor Lines when I was there. The owner purchased KW gliders, new Detroits, rebuilt trans and rears. Built his own trucks.
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