Interesting 2 Stroke Technical

oscar89 · Post by **oscar89** » Mon Feb 16, 2009 6:00 pm

Seems large diesel engines such as those used in ships & locos are 2 stroked. W/ the addition of a turbo or supercharger to pressurize the intake externally these engines are able to use a wet oiled crankcase as w/ a 4 stroke. You no longer need the piston to pump the air/fuel into the cylinder & can seal off the crankcase. No more need to burn oil & prematurely wear out a 2 stroke engine due to poor lubrication. This techinique would seem much better than the oil in gas thing.

Joliet Jake · Post by **Joliet Jake** » Mon Feb 16, 2009 6:48 pm

Right you are that?s why they use it in ships

The only problem is you have to have a dedicated oil system with a pump, sump and Babbitt bearings replacing roller bearings as well as the machining of oil passages.

Skirting on each cylinder to control oil and pressures

throw in a blower and.........

Just not cost effective ????..although the four stroke boys are getting close!

oscar89 · Post by **oscar89** » Mon Feb 16, 2009 6:52 pm

Just came to me, be hard to keep the oil out of the intake & exhaust ports as well.

Will_jdx · Post by **Will_jdx** » Mon Feb 16, 2009 7:08 pm

Another thing to remember, those 2 cycles have exhaust valves. 7000 RPM with the sled engines with valves, more parts to wear.

Will