Editing Flat-four engine (section)

=== 1900–1935 ===
[[File:Wilson-Pilcher flat-4 engine.jpg|thumb|1904 [[Wilson-Pilcher]] water-cooled engine]]
In 1900, the first flat-four engine was produced by [[Karl Benz#Benz & Cie. and the Benz Patent Motorwagen|Benz & Cie]], based on Benz's  1897 "contra" flat-twin engine.{{citation needed|date=September 2019}} This engine was used in Benz racing cars, produced {{convert|20|hp|kW|0|abbr=on}}, had a displacement of {{convert|5.4|L|cuin|0|abbr=on}} and was designed by Georg Diehl.

London company [[Wilson-Pilcher]] released its first car in 1901, which was powered by a flat-four engine. This engine was mounted longitudinally in the chassis, water-cooled, produced {{convert|9|hp|kW|0|abbr=on}} and had a displacement of {{convert|2.4|L|cuin|0|abbr=on}}. Unusually for its day, the bore and stroke were equal, with each being {{convert|95|mm|in|1|abbr=on}}.

In 1902 the Buffum automobile was equipped with opposed four cylinder engines that were rated at 16 horsepower. Herbert H. Buffum produced an American Automobile called the Buffum in Abington, Massachusetts from 1903 to 1907.<ref>{{cite web |title=The Buffum Automobile |url=http://www.american-automobiles.com/Buffum.html |publisher=Farber and Associates |access-date=2019-10-27 |archive-date=2019-04-23 |archive-url=https://web.archive.org/web/20190423025054/http://www.american-automobiles.com/Buffum.html |url-status=dead }}</ref>

Having previously produced flat-twin engines, the 1926 [[Tatra 30]] was the Czech company's first model powered by a flat-four engine. Tatra produced various flat-four engined model through the 1920s and 1930s.
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