How a 2 stroke detroit diesel engine runs

I have a couple videos of my 2 stroke detroit diesel powered pickup here on youtube, and I have gotten hundreds and hundreds of questions about how in the world it runs, and lots of people who do not believe that it really is a 2 stroke. So, I'm sorry, I don't have the best voice in the world, and I'm not the best at explaining things or getting the right words to come out, but I did my best in this video to try to give you an idea of how it runs.

Category:

Autos & Vehicles

Tags:

• two
• stroke
• cycle
• detroit
• diesel
• engine
• screamin
• jimmy
• 453t
• 453
• 453-t
• 1976
• gmc
• pickup
• deisel
• smoke
• 8v92
• motor

[e93bausch]

So why does oil from the crank case not get blown/splashed into the cylinder?

[dasani110]

@e93bausch Because the ports in the sides of the cylinder liners line up with passage ways in the block that are separate from the crank case. If you take the oil pan off, and look up into the engine, only about an inch or so of the very bottom of the liners is actually even visible because most of the liner is up inside the part of the block that has the air passages, and the top part of the liner is surrounded by engine coolant.

[e93bausch]

@dasani110 Thanks for the quick reply and introducing me to this type of engine. I was one of those people who never heard of a two-stroke diesel before.

[dasani110]

@e93bausch You're welcome. Yeah, they are an interesting creature for sure.

[hiyadroogs]

@93hopeless That's right. But because power is the product of torque & revs, two engines of identical capacity & tune, (one 2 stroke & one 4 stroke) revving at the same rpm, won't produce twice the power in the case of the two stroke. This is because the torque wave, (The drop in torque between firing impulses) isn't great enough in the 4 stroke to substantially lower the average torque level. So the difference in power between them may only be 10-15% in favour of the 2 stroke.

[steidl001]

Excellent explanation of two-stroke diesels, I've learned something new today! Thanks for sharing! 

[turbotrana]

Thanks for explaining that. We had two twin turbo two stroke detroit diesels in an old boat a few years ago and didn't really know much about the cylinder inlets or why the low pressure supercharger was required. This insight showed alot.

[93hopeless]

so basically with a two stroke diesel you have twice the power from the same size engine as a 4 stroke? i say this because with one rotation of the crankshaft you have one power stroke as opposed to a four stroke where you only have one power stroke per every TWO revolutions on the crankshaft. so if both engines go 100 revolutions the two stroke has fired 100 times per cylinder where the four stroke only fired 50 times per cylinder. is this correct?

[peteacher52]

Thanks! I heard these running on Euclid payscrapers when I was a kid, and was told they were diesel two-strokes, but I could never figure out the process!

[Peachezz131]

Great video, it really helped me learn about Detroits. My dad and I are just getting into them. So far we have three 2-strokes.