I am sure this is the dumbest question of the week, but this is my first diesel engine. Are these engines 2 stroke? Basically I am asking if every stroke is an intake, combustion and exhaust stroke? If so, what is the timing (general not exact) if intake valve open and close and then exhaust valve open and close? I am just stunned at the thought that an engine can work well that has to fill with fuel/air, burn it, get it out of there and then reload on every single revolution.

 

The Cummins engine in your truck is a 4 stroke. Some Detroit diesels are two strokes, but not yours.

 

As previously stated you have a 4 stroke. Detroit diesel made 2 strokes for years, they actually need blowers on them just to run. They are all but phased out now.

 

to quantify that statement, all but phased out in on-road applications.

theres LOTS of 2 stroke detroits in industrial and oilfield and military applications still. in point theres a 16v149 standby generator on the roof of the BP Amoco building in downtown Calgary. It backs up some data centers in the building. but its on the 33 floor mezzanine. if it EVER fails the crank or block. It'll be a cool 1/4 million bucks just to get it off the roof and a new one put up. never mind the cost of a new unit of cost of potential downtime and shutting down 4 blocks of downtown Calgary for a day.

theres tons of drilling rigs and Rail equipment pounding jimmies still. actually almost every single piece of CP rail service equipment runs a 2 stroke.

 

It seems like most of the logskidders around here has 2 stroke detriots in them. Needless to say, their sound is hard to miss. When I was in the volunteer fire dept., we had a pumper with a 2 stroke detroit in it. They are around. There is even a pretty neat video on youtube about a chevy truck with a 2 stroke translanted into it.

http://www.youtube.com/watch?v=mP4_Z...yer_detailpage

 

Thanks for the feedback. The only previous experience I have with diesel engines was when I was a kid (ok, up until I was 30) and flew model airplanes. Those little nitro-methane engines are 2 stroke diesel style engines with glow plugs. I was really struggling to see how our modern diesels could operate on the same mechanical principles - other than compress to combust.

 

Alot of those Detroit 2 strokes (if not all?) were supercharged and turbo charged to help push out all exhaust gasses at all RPM ranges.

 

If Turbo charges were added they were labeled as Silvers I think.
We own a few work boats with 6/92 Jimmys. Tough units.

 

All 2 stroke Detroits have blowers. Some are turbo charged also. Back in my day the turbo's had a TA prefix.

MikeyB

 

NONE of the modern drilling, workover, and completion rigs around here have a 2-stroke anything..
They have all but went by the way side due to many reasons... 4strokes have replaced 2 strokes in every application...
The old 2-strokes just burnt so much fuel.... they were destined to be replaced.
Although..... in EPG applications, there are still several old 6V's in hospital basements and such..... like others said, its just too expensive to dig them out..

 

1/2 the frac fleets here are still 149s. Calgary transit still runs tons of them. as of the late '90s Detroit diesel was still making NEW 92s for the US military. might be different now though.