pre-combustionn.
/ˌpriːkəmˈbʌstʃ(ə)n/, U.S. /ˌprikəmˈbəstʃ(ə)n/ In some diesel engines: commencement of combustion of the fuel in an auxiliary chamber, before it is drawn into the main cylinder. Cf. prechamber n. Frequently attributive.
ΘΚΠ
society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > diesel > start of combustion in
pre-combustion1923
1923 L. H. Morrison Diesel Engines xx. 472 One of the first of the precombustion engines developed in the United States was the Western... The precombustion chamber is located in the cylinder head almost in line with the cylinder bore.
1932 Mod. Diesel v. 43 On the Continent the line of development appears to have been directed towards securing a steady and progressive burning of the fuel by a system of pre-combustion, the charge being ignited in a partially separated chamber from which the more or less controlled expansion then passes to the working cylinder.
1972 S. H. Henshall Medium & High Speed Diesel Engines for Marine Use iv. 75 Pre-combustion chamber hot member engines are characterized by their smooth running, complete combustion with clean exhaust and a tendency to high fuel consumption.
1989 New Scientist 13 May 44/2 Pre-combustion systems are the better solution because they allow engines to burn fuel more efficiently.
This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).
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