Talk:Scavenging (engine)

Engine cycle
Something needs to be said here,  about two-stroke and four-stroke engine cycles. Scavenging is not all that important in a four-stroke engine, because two of the four strokes are specifically dedicated to the exhausting and inlet of the cylinder. On the other hand, scavenging is of critical importance in a two-stroke engine,  because they are typically trying to do both at the same time.Eregli bob (talk) 04:07, 5 August 2012 (UTC)

Missing diagrams?
In the three scavenging types descibed there are references to (a), (b) and (c), respectively. Where are the diagrams being referenced? -- T HE F OUNDERS I NTENT  PRAISE 17:37, 10 October 2012 (UTC)

Why "Scavenging"?
Why is the term "scavenging" applied to this process- what is being scavenged? When was the term first so used to describe this process in engines?Mavigogun (talk) 11:19, 8 December 2013 (UTC)
 * Good question. "Scavenging" is a common term around the early IC engine period for "picking over" in a sense that would leave nothing behind. Many of the lower classes made a poor living by scavenging coal waste for missed coal or domestic refuse and sewers for anything of small value (look at "toshers"). One can see why this "complete removal" process would acquire such a name. As to the first use, I don't know. It would be interesting to check my bookshelves for which is the first time it was in use. Andy Dingley (talk) 11:54, 8 December 2013 (UTC)

Crossflow vs loop
The article is now hopelessly confused between crossflow in 4 stroke engines and loop scavenging [sic] in crankcase compression 2 strokes. Some of this is due to the confusing, but historical, recycling of the term "loop scavenging" for two different things, but I'm talking about the vertical loop type using a deflector piston. They're significantly different, mostly (as always) owing to the different valve timing for 4- and 2- strokes. Andy Dingley (talk) 10:25, 15 October 2019 (UTC)


 * Hi Andy. To avoid this confusion, do you think it would help to split the Types section into 2-stroke and 4-stroke engines? Cheers, 1292simon (talk) 21:25, 17 October 2019 (UTC)