Talk:Back-fire

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Untitled[edit]

Suggestion: clarify earlier whether the "backfire" term refers to fire actually occurring in the exhaust, in the intake manifold, or in both. From current formulation of the article it seems to me that tardive reference to "popback" is a bit unclear and may confuse the reader. I would rather refer popback earlier in the description.Corrado72 (talk) 08:48, 17 December 2020 (UTC)[reply]

Clarification of a lean backfire A lean backfire typically occurs in the intake manifold when an engine is being operated moderate or heavy load. "Lean" is defined as an air fuel mixture that has insufficient fuel for a given amount of oxygen. The same thing can be written from the opposite perspective, "Lean" means that there is too much oxygen(collouquially "air") for a given amount of fuel.

This ability to express the same idea from two different perspectives occasionally leads to accidental mis-statemments. 210.239.48.38 10:15, 8 September 2005 (UTC)3sgte[reply]

An intake leak will result in a lean condition, not a rich condition like the article states. The manifold is under vacuum, so a leak will suck air in from the outside 68.250.246.149 07:22, 30 May 2006 (UTC)[reply]

Not in a forced induction engine where the leak is in the pressurized part between the engine (block) and the compressor. Also the article doesn't make a (perceptible) distinction between intake-side and exhause-side backfires which are quite different phenomena in terms of cause, formation, impact and possibly troubleshooting strategy. An expert may however be able to shed more light on this. 79.240.100.85 (talk) 22:12, 25 August 2008 (UTC)[reply]

Article does not mention valve timing as a possible cause. In modern engines, advanced ignition timing is rare compared to late valve timing caused by a slipped timing belt/chain, which yields the same result. —Preceding unsigned comment added by 184.58.53.77 (talk) 10:01, 26 October 2010 (UTC)[reply]

Other meanings of the word[edit]

Hey, how come this article talks just about backfires in internal-combustion engines but there ain't no info anywhere on Wiki about backfires in firearms? 98.234.126.251 (talk) 08:52, 1 August 2009 (UTC)[reply]

Origin[edit]

As far as I can tell, the term "back-fire" originally referred to the old firefighters technique (the equivalent of modern controlled fires), and not a flintlock musket. It wasn't given that meaning until after it had acquired the more common one of flames comin out of car engines in the early 20th century. The currently cited source does not comment on the etymology at all. 166.249.103.116 (talk) 17:31, 22 August 2011 (UTC)[reply]

This appears to be an American term in this context and not one I have ever come across until now. I am inclined to believe the musket theory due to its similarity to the actual cause and effect of an engine backfire (ie a mis-timed explosion), although I can find no evidence (yet) to support this. Weasley one (talk) 16:12, 4 October 2011 (UTC)[reply]

Exhaust Overrun Crackle/Pop[edit]

I believe that overrun crackle is a kind of backfile. Can anyone elaborate on this? Is this something for another article? — Preceding unsigned comment added by Ajoiner (talk • contribs) 13:29, 19 October 2011 (UTC)[reply]