2 Stroke Diesel
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Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
2 Stroke Diesel
For the first time in many many years I heard a 2 stoke diesel today. It was in an older (70's?) GMC single axle dump. Who ever was driving it was really winding it out. It's a really cool sound.
I always think of the movie "Maximum Overdrive" where the trucks come alive and start killing everyone.
I always think of the movie "Maximum Overdrive" where the trucks come alive and start killing everyone.
Elder User
Joined: Sep 2006
Posts: 798
Likes: 1
From: Alma Arkansas
I never could quite figure the detroits out. Are they a 2 cycle or not??? They have exaust ports in the sleeve AL LA 2 stroke yet there are intake valves in the head like a 4 cycle.
And yes nuthin sounds meaner than a detroit
And yes nuthin sounds meaner than a detroit
Elder User
Joined: Sep 2006
Posts: 798
Likes: 1
From: Alma Arkansas
Originally Posted by 51dueller
They are a 4 cycle 2 stroke engine.
Is every stroke of the pistion a powerstroke or every other stroke?
Because wouldn't a 4cycle 2stroke be a contradiction of terms?
Posting Guru
Joined: Sep 2004
Posts: 1,616
Likes: 3
From: Sapulpa OK
Actually the intake is thru the cylinder ports cut into the lower end of the cylinder sleeve. The ports are uncovered when the piston is at bottom dead center and because the blower has this port area under pressure the incoming air charge will scavange the cylinder of combustion gasses thru the open exhaust valves.
A very efficient and powerful engine for its size although is prone to leak oil. This design is one reason we won WWII. The military used them everywhere from Higgins boats to light plants.
Steve
A very efficient and powerful engine for its size although is prone to leak oil. This design is one reason we won WWII. The military used them everywhere from Higgins boats to light plants.
Steve
Elder User
Joined: Sep 2006
Posts: 798
Likes: 1
From: Alma Arkansas
Originally Posted by 76supercab2
Yes. It is a contradiction in terms.
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Post Fiend
Joined: Apr 2004
Posts: 6,473
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From: Lafayette, IN
4-stroke = 4-cycle
The 4 cycles are: intake, compression, combustion, exhaust (2 upstrokes, 2 downstrokes)
2-stroke = 2-cycle
The 2 cycles are compression and combustion. There are no valves in the traditional sense, the fuel/air mixture is pressurized in the crankcase by the downward motion of the piston, then are let into the cylinder once the piston passes the intake port. Do a search for "2 stroke" at www.howstuffworks.com They have a very good explanation there.
Jason
The 4 cycles are: intake, compression, combustion, exhaust (2 upstrokes, 2 downstrokes)
2-stroke = 2-cycle
The 2 cycles are compression and combustion. There are no valves in the traditional sense, the fuel/air mixture is pressurized in the crankcase by the downward motion of the piston, then are let into the cylinder once the piston passes the intake port. Do a search for "2 stroke" at www.howstuffworks.com They have a very good explanation there.
Jason
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Postmaster
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Here's a fairly in depth description of the detroit diesel 2 stroke engine.
http://www.yachtsurvey.com/comparing_diesel_types.htm
Jroehl, you are correct in your description of smaller, gasoline powered 2 stroke engines. The Detroit diesel has some differences in the design, but is still a 2 stroke. One difference is a roots style blower is used to pressurize the air into the combustion chamber, scavenging the exhaust gases and cooling the combustion chamber. This designe allows use of an oil sump similar to 4 stroke engines and eliminates the need to mix lubricating oil with the fuel.
http://www.yachtsurvey.com/comparing_diesel_types.htm
Jroehl, you are correct in your description of smaller, gasoline powered 2 stroke engines. The Detroit diesel has some differences in the design, but is still a 2 stroke. One difference is a roots style blower is used to pressurize the air into the combustion chamber, scavenging the exhaust gases and cooling the combustion chamber. This designe allows use of an oil sump similar to 4 stroke engines and eliminates the need to mix lubricating oil with the fuel.
Last edited by 76supercab2; Oct 5, 2006 at 08:01 AM.