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Sir Dugald Clark (1854 – 1932) designed the first two-stroke engine in 1878 and patented it in England in 1881.

Name Clark's name was spelled Clerk in London, where he was a member of the Royal Society and winner of the RSA Albert Medal (RSA) under this name. In his native Scotland, and particularly at the University of Glasgow where his papers are archived, it was spelled Clark.

The Clark cycle engine The Clark cycle engine uses a similar valve arrangement to the four stroke cycle diesel engine, with both exhaust and inlet valves in the cylinder head and operated by a camshaft. At the end of the power stroke, both exhaust and inlet valves open, and the cylinder is filled with fresh air supplied by a supercharger, which replaces or scavenges the exhaust gas. As no fuel or lubricant has been added to this inlet air, some loss through the exhaust manifold is not serious. The inlet gas is then compressed in a compression stroke, and the fuel injected approaching top dead centre and ignited as in a four stroke diesel engine.

The Clark cycle was used in large engines powering railway locomotives and ships, and was adopted by General Motors Corporation in the United States to form the Detroit Diesel Company.

The Clark cycle was not adapted to gasoline fuel, nor to smaller engines. The gasoline two stroke cycle, and the concept of cylinder ports replacing head valves, were both later invented by Joseph Day. Day's inventions were subsequently adapted for two-stroke diesels, and modern two-stroke diesels of all sizes either incorporate elements of both designs, with cylinder port inlets and cylinder head exhaust valves, or use cylinder ports for both inlet and exhaust.

See also

• Joseph Day

References

Sir Dugald Clark (1854 – 1932) designed the first two-stroke engine in 1878 and patented it in England in 1881.

Name Clark's name was spelled Clerk in London, where he was a member of the Royal Society and winner of the RSA Albert Medal (RSA) under this name. In his native Scotland, and particularly at the University of Glasgow where his papers are archived, it was spelled Clark.

The Clark cycle engine The Clark cycle engine uses a similar valve arrangement to the four stroke cycle diesel engine, with both exhaust and inlet valves in the cylinder head and operated by a camshaft. At the end of the power stroke, both exhaust and inlet valves open, and the cylinder is filled with fresh air supplied by a supercharger, which replaces or scavenges the exhaust gas. As no fuel or lubricant has been added to this inlet air, some loss through the exhaust manifold is not serious. The inlet gas is then compressed in a compression stroke, and the fuel injected approaching top dead centre and ignited as in a four stroke diesel engine.

The Clark cycle was used in large engines powering railway locomotives and ships, and was adopted by General Motors Corporation in the United States to form the Detroit Diesel Company.

The Clark cycle was not adapted to gasoline fuel, nor to smaller engines. The gasoline two stroke cycle, and the concept of cylinder ports replacing head valves, were both later invented by Joseph Day. Day's inventions were subsequently adapted for two-stroke diesels, and modern two-stroke diesels of all sizes either incorporate elements of both designs, with cylinder port inlets and cylinder head exhaust valves, or use cylinder ports for both inlet and exhaust.

See also

• Joseph Day

References

Dugald Clerk - Wikipedia, the free encyclopedia
Sir Dugald Clerk (1854 – 1932) designed the first two-stroke engine in 1878 and patented it in England in 1881.

Dugald - Wikipedia, the free encyclopedia
Dugald Clerk; Dugald Campbell; Dugald Christie, a Canadian lawyer and activist; Dugald Drummond, a Scottish engineer; Dugald Malcolm; Dugald Clark; Dugald Stewart; Dugald Sutherland MacColl ...

Isle of Mull Family History Pages - Dugald CLARK
Birth : 1806, Fidden, Kilfinichen, Isle of Mull, Argyllshire, Scotland: Died : Father : John CLARK: Mother : Janet MARQUIS

Dugald Stewart - definition of Dugald Stewart by the Free Online ...
Thesaurus Legend: Synonyms Related Words Antonyms. Noun: 1. Dugald Stewart - Scottish ... Dugald Clark Dugald Clerk Dugald Cowan: Dugald Dalgetty Dugald Drummond Dugald Livingstone

Manuscripts Catalogue
Copy of letter from Andrew Gray to Dugald Clark. [S.l.]. 15 Nov. 1883. Reporting on the testing of an engine Call Number: MS Kelvin LB1 Role: recipient More Details

dugaldin - definition of dugaldin in the Medical dictionary - by the ...
dugaldin. a toxic glycoside in helenium. ... Dugald Clark Dugald Clerk Dugald Cowan Dugald Dalgetty Dugald Drummond Dugald Livingstone

Dugald Stewart definition of Dugald Stewart in the Free Online ...
Stewart, river, Canada Stewart, river, 331 mi (533 km) long, rising in the Mackenzie ... Dugald Clark Dugald Clerk Dugald Cowan: Dugald Dalgetty Dugald Drummond Dugald Livingstone

Isle of Mull Family History Pages - John CLARK
1 Dugald CLARK: 2 Mary CLARK: 3 Ann CLARK: 4 Donald CLARK: 5 Duncan CLARK: 6 Nicol CLARK ... Information supplied by : Unknown: Email Address :

Manuscripts Catalogue - Document Details
Content: Copy of letter from Andrew Gray to Dugald Clark. [S.l.]. 15 Nov. 1883. Reporting on the testing of an engine: Date of Creation: 1883: Language: English

Dugaldia hoopesii - definition of Dugaldia hoopesii in the Medical ...
Dugald Clark Dugald Clerk Dugald Cowan Dugald Dalgetty Dugald Drummond Dugald Livingstone ... All content on this website, including dictionary, thesaurus, literature, geography ...