Talk:Junkers Jumo 205

This motor remains the most sucessfull diesel engine ever used, in aviation.In a time when a brent of oil costs more than US$140, a commercial aviation based on diesel, can return.Agre22 (talk) 22:47, 9 July 2008 (UTC)agre22

The same photo from http://en.wikipedia.org/wiki/File:Jumo205_cutview.JPG is used on three different pages representing different engines of two different manufacturers and three different engine models. In order to achieve some sort of credibility you must verify which of the three engine types this photo actually represents, and remove it from unapplicable pages. PatrickDunfordNZ (talk) 23:17, 24 January 2009 (UTC)

It's used to represent different closely-related engines, but is correctly described as a 205 in each use. Andy Dingley (talk) 23:34, 24 January 2009 (UTC)

The problem is that we need more free images of these engines, the image captions clearly state what the relationship is between them, it's not ideal but better than nothing. The actual differences between them all are relatively minor (bore/stroke etc) the image serves at the moment to show the unusual layout of these engines. I have seen a potential 'non-free' Napier Culverin image (the license tagging has to be absolutely correct else it gets deleted) but the image is not particularly good. If I remember correctly I split the 204 and 205 from a single article some time ago. Might be worth noting that the Culverin was a licensed built version and is not going to appear much different. There is an active task force trying to address these problems and others at WP:AIRENG, we will get there eventually. Cheers. Nimbus (Cumulus nimbus floats by) 00:02, 25 January 2009 (UTC)

As far as verification goes in the Napier Culverin article, as I created it, I can assure readers that the information is as cited in the very comprehensive reference book that I used, I don't understand the questioning of this myself. I also added the reference section to the 204 and 205, agreed it could do with more cites. The main development text was pre-existing and unreferenced but I assumed good faith with this and left it until it can be referenced as it is not contentious. Nimbus (Cumulus nimbus floats by) 00:16, 25 January 2009 (UTC)

Smoke/ poor scavenging

Smoky exhausts in 2 strokes is attributable to crankcase induction. Hot oil, splashed around, is drawn into the cylinder when the piston is near BDC, remembering that each cylinder has a sealed crankcase and uses crankcase pressure to aid cylinder filling. Rotary or reed valves facilitate the crankcase drawing air/fuel mixture from the carburetor, as the piston rises. Poor scavenging is analogous to exhaust gas recirculation. It cools combustion temperatures and allows leaner mixtures, usually part of a suite of emission reduction measures, ie the antithesis of smoky exhausts! — Preceding unsigned comment added by 121.214.62.9 (talk) 18:11, 6 March 2014 (UTC)

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