knocking/knock

knocking/knock
A loud knocking or banging noise made inside a reciprocating engine cylinder during the combustion stroke caused by shock waves produced by the detonating engine. Knocking is an explosion rather than a smooth burning process. It is caused by burning either the wrong fuel or the incorrect amount of fuel. The fuel-air mixture, in this case, ahead of the flame front gets so hot that it explodes and produces a rattling noise, or knocking.

Aviation dictionary. 2014.

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  • Knocking — Knock ing, n. A beating; a rap; a series of raps. [1913 Webster] The . . . repeated knockings of the head upon the ground by the Chinese worshiper. H. Spencer. [1913 Webster] …   The Collaborative International Dictionary of English

  • knock — v. & n. v. 1 a tr. strike (a hard surface) with an audible sharp blow (knocked the table three times). b intr. strike, esp. a door to gain admittance (can you hear someone knocking?; knocked at the door). 2 tr. make (a hole, a dent, etc.) by… …   Useful english dictionary

  • Knock knock ginger — The original term Knock Knock Ginger, now also known as Ding Dong Dash, Ding Dong Ditch, Knock Door Run, Dolly Knock, Chappy (Scotland), Chap Door Run, Knock Down Ginger, Ring and Run, Knick Knock Nanny, Nicky Nicky Nine Door, Buzz Buzz Book it,… …   Wikipedia

  • knock — ▪ I. knock knock 1 [nɒk ǁ nɑːk] verb [transitive] 1. FINANCE if something knocks the price of shares, stocks etc, the price changes very quickly and unexpectedly: • Talk of easing the US credit policy knocked prices higher in light trade. • Its… …   Financial and business terms

  • Knock — PlacesKnock is a place name found in a number of countries.Germany* Knock, East Frisia, East FrisiaIreland* Knock, County Mayo * Knock Shrine * Ireland West Airport Knock, commonly known as Knock Airport also * Castleknock, County Dublin *… …   Wikipedia

  • knock — {{Roman}}I.{{/Roman}} noun 1 firm sharp sound ADJECTIVE ▪ loud, sharp ▪ gentle, light, quiet, soft ▪ timid ▪ …   Collocations dictionary

  • knock — {{11}}knock (n.) mid 14c., from KNOCK (Cf. knock) (v.). As an engine noise, from 1899. {{12}}knock (v.) O.E. cnocian (W.Saxon cnucian), to pound, beat; knock (on a door), likely of imitative origin. Meaning deprecate, put down is from 1892.… …   Etymology dictionary

  • Knocking on wood — Knocking on wood, and the spoken expression knock on wood or touch wood are used to express a desire to avoid tempting fate after making some boast or speaking of one s own death.The expression is usually used in the hope that a good thing will… …   Wikipedia

  • Knock, Knock, Ginger — or Knocky Door Ginger were the names for the game dating back to 19th century England or possibly before to the Cornish traditional holiday of Nickanan Night. This game or prank is played by children in many cultures. It involves knocking on the… …   Wikipedia

  • Knocking — Knock Knock (n[o^]k), v. i. [imp. & p. p. {Knocked} (n[o^]kt); p. pr. & vb. n. {Knocking}.] [OE. knoken, AS. cnocian, cnucian; prob. of imitative origin; cf. Sw. knacka. Cf. {Knack}.] 1. To drive or be driven against something; to strike against… …   The Collaborative International Dictionary of English

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