🔴 All about 2 Stroke Diesel Engines and how they work in 3D Animation.
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- Опубліковано 1 лип 2023
- In this video we analyze the 2-stroke diesel engine with 3D animations and we define why they are so good.
#2stroke #diesel #power #repariman22 #turbo #supercharger #speed #rpm #pistons #engine #3d #horsepower #torque #2strokes #cars #car #truck #detroit #detroitdiesel #twostroke - Авто та транспорт
Detroit Diesel overcame the high rpm issue through a blower bypass. When the turbo exceeded the blower, the bypass valves opened and the excess air "bypassed" the blower. Those two stroke Detroit Diesel engines where a remarkable engineering feat
The valves on ship engines are also not run by a traditional camshaft. They are actuated hydraulically, so the timing of when they open and close can be varied quite widely.
Nice video chap👍🏽
But, at 3:24 you said that "You can't use a turbo without a blower because the turbo doesn't spin at low revs..."
EMD found's way to overcome this, by clutching the turbo so it has low speed and high speed settings so as to keep power and torque as well as lowering the low rev emissions.
Your statement about the blower affecting efficiency of turbo engines at high loads was addressed by General Motors in the late 1980's with their TIBB option on engines. TIBB being Turbo charged, Inter cooled, Blower Bypass. A boost pressure operated flap valve mounted on modified blowers opens at high boost and air flows around the blower lobes. It made a very measurable improvement to engine power and efficiency.
Great Vid
Detroit also offered this on some of their engines. My bus's 6V92TAC has a bypass scavenge blower, so some of the turbo's output will bypass the blower's lobes at higher RPMs.
@@icenijohn2 Yes they sure did, 92 series in high output spec had it. Old Detroits were amazing engines, the factory performance options would easily double the power output of a standard Natural engine. Just keep bolting on bigger injectors, charge air inter and after coolers, fuel coolers, high speed blower drives, bigger turbos.
The most efficient engine ever developed for turning diesel fuel into noise.
Your 3D animation skills are really good
The Deltics were brill. The sound was unique, could identify them long before you saw them coming. Those Locos did more than 2 million miles at 3300hp.
As the US truck repairman said, a Detroit 2-stroke Diesel is the most effective machine ever invented, to convert fuel into noise. That aside, our old 2-stroke boat diesels had low rev, low HP, high torque momentum and very low fuel consumption. I´d love to have one in tip top shape to run my electric generator and my air compressor.
Just a detail
Having worked on 2 stroke diesels both opposed piston and valved the exhaust valves open before the piston uncovers the inlet ports so as to allow the residual pressure in the cylinder to blow down and the valves are shut before the piston has recovered the ports
Great vid
Funny enough the whole reason I just watched this was because I had the question of valve timing. This makes a lot of sense.
True - an advantage of using cam-driven valves in a 2-stroke (instead of the simpler piston-controlled port) is the ability to offset the exhaust timing from the intake timing, without resorting to opposed pistons running out of phase.
Another advantage of handling one side (normally exhaust) with valves is that it provides uniflow scavenging... again without resorting to opposed pistons.
From 1:32 to 2:05 the video shows clearly that in a uniflow scavenged two stroke the "supercharger" is not supercharging the cylinder - because the exhaust port is open and pressure will be only slightly above atmospheric pressure. The blower is actually a scavenge pump and not a supercharger , and should be referred to as such.
2:10 Gasoline two strokes can also use uniflow scavenging. There is nothing about using gasoline as fuel that prevents it. The reason they don't is that crankcase pumping is far cheaper and lighter than fitting a blower and direct injection to something like a line trimmer or chainsaw.
Back in the day I drove a Terex dump truck in a quarry. It had a 14ltr two stroke detroit diesel which had a fantastic whine...
Nothing like the wail of a Detroit howling at the universe.
Now do a video on the Napier Nomad's two models in all their wild complexity, it's a fascinating little character in a small group of turbo-compound diesel two-stroke engines that never reached maturity owing to the increasing performance of gas turbines of the day.
Great explanations! Keep up the good work!
WOW, I have been working on engines for a long time and have never seen anything like that Deltic. Really cool stuff. Nice video. Thanks.
Opposed pistons are by far the best solution!
I really like these videos. Thanks!
Really good. Answered all my questions.
That locomotive engine... It looks crazy... :)
Flipping cool, thanks.
Great video, thanks !
Old 2 Stroke Detroits were indestructible, also all of the engines are supercharged and sometimes additionally turbocharged as well.
No, they were all externally scavenged (not supercharged) with a mechanical blowrer, and some were also turbocharged.
Excellent video!
GREAT VIDEO!😁
If you tune camshaft on 4stroke to open intake valves and exhaust valves at same time and get compressor and turbo too, you have it much better. Without one ring and wear on rings from port lol.
Thanks for this video, now I understand these engines a little bit better. If there were any issues I had with this video though, I think EMD's 2-stroke engines were able to run on just turbochargers with some kind of a clutch system and I really don't think oil consumption is reduced if oil gets into the combustion chamber of an engine since needless to say oil is a very dirty fuel.
They had/have a pretty unique turbo that was driven by the crankshaft at low RPMs, but when the flow of the engine was sufficient, the exhaust takes over and runs it like a normal turbo rather than a supercharger or procharger as they are known. They have what's called an overrunning clutch made into them to decouple from the crankshaft at the required RPMs and exhaust flow. Hope that helps.
@@robertschemonia5617 Thank you, and I already heard about that but I forgot so thanks anyway.
I sailed on one of the maersk tripple e's (sencond gen) shown in the video. At start up
, it could run 23 rpm. It sounded like african drums. It was awesome. When doing 73 rpm though, everything shaked. It was also with electronical/hydraulic activation of exhaust valves. And we could completely disengage a cylinder
Fascinating
Great video. Thx
Opposed piston is insanely efficient
You only have to compare the Deltic with the Class 37 locomotive (Both built by English Electric)
Class 37 1750hp, V12, 4-stroke, 850rpm
Class 55, 3300hp, Two 18 cylinder Napier Deltic engines, 1500rpm
Both weigh about the same
Another interesting point, on fast patrol boats, Deltics replaced RR Merlin engines
@@g8ymw IIRC the Deltic and related opposed-piston multi-banks were developed for motor torpedo boats and other light craft, being thin-skinned the difference in fire risk between German-manufactured E boats using diesel powerplants and petrol powerplants used by British equivalents was significant, ironically the Deltic was developed from Junkers Jumo 204 licensed produced by Napier as the Culverin. What I didn't previously know was that Napier continued their R&D into stupendously powerful turbo-compounds after the Nomad was dropped and mated a Deltic to an axial compressor and gas turbine as a gas generator to produce some ridiculous >5000bhp figure before failing, though it didn't have the fearsome gnashing gearbox linking the gas turbine to the piston pack.
Belle vidéo technique. Merci
Another repairman22 banger
Could you do a video on the Fairbanks Model 32?
Perfect
good animation
This is just the ultimate design. I’d so love to have a Detroit in my conversion van. Lol
Fairbanks-Morse used to make a locomotive with an opposed piston diesel.
They started with stationary engines, and made engines for much more than locomotives... but yes, they were known for their opposed-piston diesels.
Now turn that injector into a gas direct injector & add a spark plug. Add variable timing on the exhaust valve. Then you have 2 stroke gas without oil mixing & big power
Can you do one on the brilliant Honda k series mate??
So now I know - thanks.
I know very little about diesels but the "2 stroke" part got me wondering: is it possible to do without a blower by adding a check valve to the input? Regular gas 2-stroke engines often have a reed valve to prevent backblow of air-fuel mixture, won't having this on a 2-stroke diesel also prevent exhaust gas blowing back into the air intake?
The cylinder in the 2-stroke diesel pulls almost no vacuum, so the air needs to be pumped in. On the conventional 2-stroke petrol engine, the sealed crankcase is used as the “pump” to draw the charge from the intake and then push it into the cylinder.
@@Clyde-2055 I see, thank you for the explanation. The intake port is too low for effective suction to occur on the downstroke (after the piston passes by the port and uncovers it) and if the port is moved upwards any valve we could put there will be influenced by the hot gases during the power stroke. Guess there is no free lunch after all.
I got an undestanding of my qestion
Nice video. Just keep in mind that the piston’s mean speed is nearly same between a 2stroke low speed engine and 4stroke high speed engine.
True
But cushioned at the top of stroke every time.
@@partymanauright, it’s why I write « mean speed ».
A turbo always spins when it has exhaust blowing by it
Sh.. I meant to try this on a string trimmer before I saw that I'd need a turbine. It would be one heavy trimmer.😂
Sounds like a pretty good option for a slow speed, high torque rock climbing environment, maybe drifting. Otherwise, they're not car friendly.
But what is your quoted 800cc engine? This would be good for a small tractor
So what is next ?
Do they have that 2s range extender or no ?
One thing I want to add: the locomotive you showing in the video is an ALCo WDM3D locomotive for Indian Railways, which has V16 Four stroke diesel engine, we have EMD locomotives which has V16 Two stroke diesel engine, classes are WDG4, WDG4D, WDP4, WDP4B & WDP4D...
how to lubricating on two stroke detroit diesel truck
I wonder if you couldn't do away with the displacement blower if you used an electric motor to spin the Turbocharger up enough to start the engine? Then for more performance without the loss of efficiency of having the blower in the path, use a slightly larger turbocharger to blow into the primary turbocharger to get enough air for high RPM.
At low rpm the turbo wouldn't spin fast enough to supply air to the cylinder and it would choke itself out.
Yes, electrically powering a turbocharger as a blower would work, if the speed were controlled appropriately, and if you were willing and able to continue to power it until a high enough engine speed and load is reached... not just for starting.
This is how is done in reality. The electric powered blower (or scavenge pump) operates at start-up and when manoeuvring in port to supplement the turbocharger. At full away on passage, the electric blower is stopped.
I couldn't understand how the lubricating system works
Opposed piston diesels are extremely clean. However uncontrolled injection will create black smoke.
The direct injection Rotax ETECH burns gasoline but it’s more efficient and more powerful than competing four strokes.
well gasoline 2 stroke can works the same with direct injector and charger
Literally boat anchors nowadays in truck's. Do like hearing them rev tho, like a screaming jimmy
With the exception of not being a unit injector that renualt engine is a direct copy of a Detroit Diesel in operation.
It is the same... and Detroit Diesel was far from the only company to use that design.
Do the the engine from the Citroen 2cv
This sunday will be uploaded.
Imagine somebody makes a four cylinder two stroke diesel with electric blower (super charger)
In a 2-STROKE with an angled intake port the air/fuel mixture enters at an angle and makes a loop and pushes the exhaust gasses out the exhaust port. Do we really need a valve?
Look at some of the designs used by Japanese on their big stroker bike engines before the Greenies killed em off. Angled ports, windows in piston skirts, oil recirculation. A whole bunch of tricks forgotten over the years.
Need? No.
Is it beneficial? Yes
Port timing is the same on opening and closing, but a cam-controlled valve can have any timing desired.
Uniflow scavenging is certainly better than loop scavenging.
What do you make these 3D animations with?
Solidworks
The longer the stroke the greater the torque...
Motores diesel de dois tempos, são muito melhores.
Probably need to watch this a few times to get most of the details.
2-stroke diesels are a bit hard to understand as they're an engine most people wouldn't operate or see in real life.
Weird that ship engines have one piston stacked on top of another.
Back in the 60's, 70's and 80's every second truck was running General Motors 2 stroke engines. Known as Jimmys, or bird scarers. The most efficient engine ever developed for turning diesel fuel into noise.
Good point, 2-stroke Diesel engines aren't very common nowadays so of course no one can entirely understand it.
The lower item shown from 4:38 to 4:54 is a cross head, not a piston, and it is explained in the video narration.
@@fexploder3281they're still common... just not in trucks.
@@brianb-p6586True, they are still used in large ships and some locomotives today.
High Efficiency Low Emission Hybrid ICE:
By simply splitting the ring-section from its skirt - to be operated by a (valvetrain-like) piston-train to pump the gases during the intake and exhaust strokes, and combined with the skirt to complete the compression and power strokes - can achieve the hybrid. Which completes the 4 strokes, different in both displacements and periods, in every engine revolution - called D-cycle (Differential-stroke cycle) - a hybrid of the 2-/4-cycles.
The D-cycle’s controllable exhaust strokes can be shortened to retain high amount of burnt gases to control the ignition initiation and combustion rates for the HCCI/LTC (homogeneously charged compression ignition with low temperature combustion). When combined with the (gasoline type) stoichiometric air/fuel ratio intake under high-compression ignition, it is the diesel-gasoline hybrid with the benefits of both - called SCCI/LTC-BGR (Burnt Gas Retention).
The resultant hybrid can have Atkinson-cycle strokes, whole engine working at lower rpm, fewer cylinders with lighter engine support and vehicle styling, weight and efficiency gains, and etc. Diesel engines can avoid soot and NOx formation saving expensive after treatments with lower noises. Gasoline engines can enjoy diesel type (within structural limitations) efficiency (test shown >20%) and torque gains ( >2.5x).
Are you sure, that diesel had Spark plug?😂
The diesel engine shown in this model has, like every other diesel, a fuel injector... not a spark plug.
How many kinds of diesel two strokes?????????????????????????????????????
warum wird der Beitrag deutsch beschrieben, kommt aber direkt in englisch???
Google automatic translate.
Why do most 2-stroke diesels use exhaust valves rather than ports?
Timing and uniflow scavenge
So they can fit in a regular truck chassis
?>@@markfairhall3671
@@markfairhall3671 But what does that have to do with anything in this case?
This allows for "uniflow scavenging (which is mentioned in the video) which is more efficient that "loop scavenging".
A supercharger is on a four-stroke type engine , on a two stroke engine it's called a blower . The most important thing for a Diesel is TOUQUE not horse power ,I think that's why they just got left behind. 🤔 imo
Still doesn't get how blower has a limited boost despite attached to engine rpm
When the compressor spins faster, it pushes more air, but the engine also consumes more air at higher rpm.
Positive displacement pumps, not centrifugal.
To use a positive displacement blower at full power it would need to be huge. A smaller blower is used at start-up and low RPM and a turbocharger at full power. Turbos are better for high flow rates.
I dont understand why a person couldnt use a two cylender , one as the compressor to compress the air and the other for the combuster for power that should solve the the power problem at low rpm , using diesel for a fuel should yield alot of power .
@@carstennobody7047 Yep, OLD high powered engines have INSANE maintenance schedules.
That would be the Scuderi cycle engine.
Yes,@@sockmonkey6666, but there are other designs as well, using piston-controlled ports instead of vavles.
ничем не хуже четырёхтактных двигателей
The deltic engine looks complicated
i still wi say after 1 or 2 weeks
the blower spins the wrnong derection I AM NOT WRONG
Sure!!!! If you want to live in a lie do it. Nobody stops you.
if a large ship is in port and is idling engines it does produce a massive amount of pollution. port towns have significantly increased cancer rates. because the energy density is so high and the fuel is so cheap i dont see any other fuel that can be used in the future besides nuclear or liquid hydrogen.
When large ships are stopped in port the big propulsion engines are off. These engines are directly coupled to the propeller so when the ship is stopped so is the engine. These ship frequently plug in for electrical power so generator emissions are greatly reduced.
@@jamesmurney1374 they are also required to switch fuels and burn bunker fuel while out in the ocean and burn cleaner low sulfur diesel closer to shore.
A lot of ports will have steam and power provisions for vessels, it's usually preferable because sitting around in port with the engines running builds maintenance and lifetime hours on the machinery, the Russian carrier/carrier-cruiser Admiral Kuznetsov often didn't have sufficient steam or electrical umbilical provisions available to power the vessel so the engines racked up tens of thousands of hours and it shows- the powerplant and a lot of other machinery is sometimes thousands of hours beyond it's useful working lifespan and it never leaves port without a fleet of tugs in case it inevitably suffers a breakdown, and given that it is exclusively mazut/bunker oil fuelled and the poor powerplant tuning it tends to identify it's presence by belching great gouts of sooty particulates
On the side, there was a paper released recently that described the effects of the disappearance of so-called ship trails, the clouds left behind vessels fuelled with high sulphur bunker oils as a result of the sulphur aerosols (in the form of sulphur dioxide and sulphuric acid produced when the former interacts with water) seeding clouds, legislation made in 2020 or 2021 changed the regulations on the limits of sulphur content in bunker oils and the net result of this was significant reductions in those trails of seeded clouds, and a proportional increase in the amount of sunlight and thus warming of the atlantic and other areas with particularly dense shipping lanes which would otherwise be scattered out into space again, as measured by arrays of satellite images and oceanographic sensor data. The concept of deliberately deploying sulphur aerosols from aircraft to produce reflective clouds or relax sulphur content limitations on commercial aviation fuels to produce thicker condensation trails has been tossed around as a method of geoengineering
Emissions have ruined the diesel engine. Now they're plagued with sensor issues.
Wrong - they create more emissions.
Your wrong about the burning oil part 100% wrong
which part?
@@repairman22 two stroke diesels burn oil when new
And there's the long-invented VALVELESS !!! "Puch double-piston engine" . . . "Puch Doppelkolben Motor" (german). . .
This EXTREMELY SIMPLE (!) working principle of a gasoline two-stroke engine can also be applied to the diesel engine - and calculated accordingly!!!
That's the split-single engine... a horrible and antiquated design.
Your blower is running in reverse. Your engine can't run.
the blower is running ok. check it.
@@repairman22 It's pulling the air OUT of the cylinder. I work on screw blowers. This one is running backwards.
as I said... Google it. Look for more videos in youtube if you don't trust me. Share me a video if you find one... thank you.
@@TheOwlGuy777This isn't a screw type, it's a roots and the air travels around the outside of the blower lobes.
No. its correct.
Very stupid animation..................... totaly wrong finaly......
Saying that something is wrong without saying what means that the video is perfectly correct. Thank you.
if this engine design is more efficient in the actual sense, does it mean "it puts out black smoke so it must be bad, green energy looks clean so it must be more environmental friendly" is a shallow and emotional judgement?
There is much, much more to it than that
Well actually it does let out more particles that would hurt air quality in a more concrete way than regular diesels, and logistically speaking it would require more oil to be sold which could also potentially increase emissions indirectly. 2-strokes also have a distinct powerband that doesn't fit all use cases.
Right. “Green” technologies don’t reveal anything “dirty” looking to the end user, so suckers can “feel” that electric, etc. is clean.
In short: Yes _and_ no. It is more environmentally friendly in the sense it uses less fuel for the same energy outtake due to better efficiency. But in the sense of particulates, NOx etc. it is worse, but it is ideal for marine operation where the need for additional washing of the exhaust is less necessary.
Not necessairly because the thing is although 2-stroke engines can be improved in terms of things like emissions and efficiency, nobody wants to let the 2-stroke engine take over since the 4-stroke engine had many years of development and the 2-stroke never had time to be trusted due to being killed by things such as emissions and efficiency as I said.