Why do Diesel Engines require 2 valves?

[steamer]

HUUH What ya say!?


;D

 

[Till]

Some of you didn't understand the gnome monosoupape.

This engine has two valves per cylinder (if in doubt, read wikipedia first before answering).
1)the namegiving monosoupape, located at the top of the cylinder and controlled by a cam. Which is an poppetvalve type outlet.
2)the intakevalve, which is basically a hole located in the piston and opened by the suction caused by the piston on downward travel during induction stroke.
Rich mixture with lots of oil is sucked from the crankcase into the cylinder until the vaccum in the cylinder ceases and counterweights close the intakevalve.

As you can see, poweroutput is strongly limited by bad cylinder filling at high rpm, as the induction controlled valve will not open nor close at the right time.

 

[Stan]

Reliability was not an issue with Detroit 2 strokes. They made engines from 1 cylinder to 16 cylinder, all with interchangeable parts within a series, from about 1935 to about 2000. They made three series, 53 ci, 71ci an 92 ci per cylinder. They quit when they couldn't make the engines meet the new emission regulations. These were all intake port, exhaust valve configuration with a blower on the intake and some with an exhaust turbo as well.

 

[Maryak]

Yes,

They were a great engine. There was some talk around the CAFE standard and Detroit 2 stroke using a turbo scavenge blower driven off the flywheel to try and comply. I guess it was not successful as they elected to go 4 stroke.

Best Regards
Bob

 

[GOOFY063]

don't forget about the EMD's in the locomotives the big Detroit's,up to twenty cylinders and 710cid per cylinder ;D ;D

 

[terrywerm]

Those Detroit engines sure were noisy devils, too.

When they came out with the 4 cycle engines (60 Series) we always used to say that they were Detroit engines with the new converters on them. Someone would always ask "what new converters?" to which we would reply "the ones that convert noise into power". :big:

 

[chuck foster]

chuck you might want to look at this guys web page http://www.oldengine.org/members/durand/
right at the bottom he has a write up about his one valve engine.

it might be of some help

chuck

 

[cfellows]

chuck you might want to look at this guys web page http://www.oldengine.org/members/durand/
right at the bottom he has a write up about his one valve engine.

it might be of some help

chuck

Thanks for pointing me to that, Chuck. That's a great writeup.

Chuck

 

[Rustkolector]

I know this is an old thread, but I just ran across it.

Yes Chuck, a diesel can be produced with just one valve per cylinder. In fact it was produced here in the USA in the 1930's, and was known as the Monovalve diesel. Surprisingly is was an L head engine.

Jeff

http://gasengine.farmcollector.com/Gas-Engines/A-Monovalve-Diesel-Engine.aspx

 

[cfellows]

I know this is an old thread, but I just ran across it.

Yes Chuck, a diesel can be produced with just one valve per cylinder. In fact it was produced here in the USA in the 1930's, and was known as the Monovalve diesel. Surprisingly is was an L head engine.

Jeff

http://gasengine.farmcollector.com/Gas-Engines/A-Monovalve-Diesel-Engine.aspx

I guess pretty much everything has been thought (and maybe tried) before.