GM 2-stroke V8 start and run (Higher quality)

Same as the other video, Detroit Diesel 8V-71, except from another angle. Some blue smoke visible from one side of the engine.
:::: INFO ADDED ::::
Many do NOT understand the meaning "2-stroke", which 98.5% of the world population do. The definition of "two\2-stroke" do NOT (I REPEAT; "DO NOT"!!) say wether the engine has valves, carburettor, injection or not, but rather how many strokes the piston has to take before new air\fuel enters the cylinder. The modern type two stroke diesel engine have valves, are direct injected, are supercharged\blowed and have full pressure oil lubrication.

HOW A TWO STROKE DIESEL ENGINE WORK:

1. When the piston is at the top of its travel, the cylinder contains a charge of highly compressed air. Diesel fuel is sprayed into the cylinder by the injector and immediately ignites because of the heat and pressure inside the cylinder. This is the same process as 4-stroke diesels.

2. The pressure created by the combustion of the fuel drives the piston downward. This is the POWER STROKE.

3. As the piston nears the bottom of its stroke, all of the exhaust valves open. Exhaust gases rush out of the cylinder, relieving the pressure.

4. As the piston bottoms out, it uncovers the air intake ports. Pressurized air fills the cylinder, forcing out the remainder of the exhaust gases.

5. The exhaust valves close and the piston starts traveling back upward, re-covering the intake ports and compressing the fresh charge of air. This is the COMPRESSION STROKE.

6. As the piston nears the top of the cylinder, the cycle repeats with step 1.

Category:

Autos & Vehicles

Tags:

• Detroit
• Diesel
• 8v-71TT
• 8V-71
• cold
• start
• engine
• boat
• smoke
• twin
• turbo
• valves
• 8v-92
• TT
• two
• stroke
• oil
• 871
• exhaust

[burningtheangel]

So this engine... Would it be more torque-y or more on the power side of things... Cause obviously a diesel engine is better for torque than power but a 2 stroke is leaning more towards better power than torque due to higher revs...??

[Da9eI]

@burningtheangel Youre mostly correct. Many think two stroke engines spin faster then 4-stroke engines, in most cases it is true (for gas engines), but in this case a Detroit two stroke diesel does normally not. It is possible and safe to adjust the governor so it can spin up to 3-3500rpm for short periods of time, but max continious rpm is usually rated at 2300 or 2100. So in most cases it turns slower than an equally sized four stroke diesel engine.

[burningtheangel]

@Da9eI Better for torque then? I've not really researched much into 2 stroke as they're most common in 50cc mopeds and generally very basic. Also what would this engine be used for? Sorry if you've been asked all this before, there are a few too many comments for me to read through :P

[Da9eI]

@burningtheangel The two stroke diesel is perfect for any application that require constant speed, like a generator or marine propulsion. But back "in the day" they were allso used in road transport (i.e buses, trucks), and large cars. Theese diesels are quite different compared to a gas two stroke, since they have full pressure oil lube, cam and valves. The design is still beeing used in heavy\large applications like ships and lokomotive. Yep, there are lots of comments here!

[Da9eI]

@burningtheangel So, a common thing for a two stroke, is that you have to keep the revs high to "harvest" the most power, as they are quite weak at lower rpm. Im not really sure the power vs rpm curve of the two stroke diesel, but I would imagine it is quite linear compared to a four stroke diesel. The other thing about two stroke diesel, is that they have quick "rpm acceleration".

[Da9eI]

@nathannickel1 I think you misunderstand the meaning "2-stroke", which 98.5% of the world population do. The definition of "two\2-stroke" does NOT say wether the engine has valves, carburettor, injection or not, but rather how many strokes the piston has to take before new air\fuel enters the cylinder. The modern type two stroke diesel engine have valves, are direct injected, have full pressure oil lubrication and are uniflow scavenged. Understand? Good.

[Da9eI]

@MrMrcrain If its oil consumption is high you're using the wrong oil viscosity, or has very bad maintenance. Theese engines does not requre alot of love, just a little bit is enough and they'll last forever. I've seen some examples of oil Leaks, but thats another story!

[MrPhotodoc]

TWIN TURBOS?

[dexter2433]

@TheTwoStrokePower this is so wrong lets look a dirt bike a yz250 2t compared to a yz250f

yz250 2t 48.8 horsepower and at 8800 rpm and 30.6 foot-pounds

yz250f With 35.33 horsepower and 18.76 lb-ft of torque,at 13.000 rpm

andthe same is true in the big engine world for the most part

the misconception is in how broad the torque curve is most of the time the 4 stroke have to rev much higher to come close to the power and torque of the 2 t brothers so the torque the 4t has is strung out longer

[dexter2433]

@burningtheangel the 2 stroke is not reeving higher in fact most 2 strokes do not rev as high as there 4stroke brothers but because it is a power stroke every time rather then every other time it sounds faster but the crank rpm is slower

and many 2stroks have grater torque then 4stroks per cc

and smaller cid 2stroke will have more torque then a larger cid 4stroke were the confusion is how long the torque curve is

[1illert]

@DJRuteOfficial yes moron, thats the exhaust valves and they open every second stroke. its a 2stroke! the intake is ported into the cylinder

[burningtheangel]

@Da9eI Ahh cool. Well thanks for all the info! I might read up more on some of this stuff... I'm just a car mechanic so I only ever deal with 4 stroke. Would like to get into agriculatural and HGV mechanics just to see a bit more diversity in what I work on. Or a motorbike mechanic... Then i'd get loads of 2 stroke mopeds too! :P