Editing H engine (section)

== History ==

===Aircraft engines===
[[File:CASM - Napier Sabre - 030906.jpg|thumb|[[Napier Sabre]] H-24 engine (starboard side)]]
*[[Lycoming Engines|Lycoming]], US
**[[Lycoming H-2470]] H-24 "[[hyper engine]]" (1930s) {{cvt|2300|hp}}
*[[Fairey Aviation]], UK
**[[Fairey Prince (H-16)]] (1939) – {{cvt|1500|hp}}
**[[Fairey Monarch]] (1939) – H-24 {{cvt|2240|hp}}
*[[Klöckner-Humboldt-Deutz DZ 710|Klöckner-Humboldt-Deutz DZ 720]] – H-32, 102.9 litres diesel
*[[D. Napier & Son]], UK.
**[[Napier Rapier]] (1929) – H-16 air-cooled vertical, 8.83 litres {{cvt|340|hp}}
**[[Napier Dagger]] (1934) – H-24, air-cooled vertical, 16.85 litres {{cvt|890|hp}}, a development of the Rapier
**[[Napier Sabre]] (1938) – H-24, water-cooled horizontal sleeve valves, 36.7 litres {{cvt|3500|hp}}.
*[[Pratt & Whitney]], US
**[[Pratt & Whitney X-1800|XH-2240]] - H-24, liquid-cooled,
**[[Pratt & Whitney X-1800|XH-2600]] - H-24, liquid-cooled,
**[[Pratt & Whitney XH-3130|XH-3130]] - H-24, liquid-cooled,
**[[Pratt & Whitney XH-3130|XH-3730]] - H-24, liquid-cooled,
*[[Rolls-Royce Eagle (1944)|Rolls-Royce Eagle]] (1944) – H-24, 46.2 litres, {{cvt|3200|hp}}.

=== Formula One racing engines ===
The [[British Racing Motors]] (BRM) H-16 Formula One engine won the 1966 US Grand Prix in a [[Lotus 43]] driven by Jim Clark.<ref>{{cite web|url=http://members.madasafish.com/~d_hodgkinson/brm-e-H16.htm |title=BRM engines H16 |publisher=Members.madasafish.com |access-date=2010-09-12}}</ref> It was also used by the unsuccessful 1966 [[BRM P83]] car driven by Graham Hill and Jackie Stewart. As a racing-car engine it was hampered by a high [[center of gravity]], and it was heavy and complex, with gear-driven twin overhead cams for each of four cylinder heads, two gear-coupled crankshafts, and mechanical fuel injection.<ref>{{cite journal |journal= Model Cars |issue= July 1967 |last1=Taylor |first1=Roger |title=Lotus 43 & B.R.M. 83 |page= 327 |url=http://vsrnonline.com/Mags/MC/Vol4/V4N7/MC_V4N7_p327.jpg |archive-url=https://web.archive.org/web/20160326130659/http://vsrnonline.com/mags/mc/Vol4/V4N7/MC_V4N7_p327.jpg |archive-date=26 March 2016 |url-status=dead}}</ref><ref>{{cite journal |journal= Model Cars |issue= July 1967 |last1=Taylor |first1=Roger |title=Lotus 43 & B.R.M. 83 |url=http://www.vsrnonline.com/mags/mc/Vol4/V4N7/MC_V4N7_p328.jpg |page= 328 |archive-url=https://web.archive.org/web/20160304185506/http://www.vsrnonline.com/mags/mc/Vol4/V4N7/MC_V4N7_p328.jpg |archive-date=4 March 2016 |url-status=dead}}</ref>

<gallery mode="packed" heights="200px" style="text-align:left">
File: BRM H16 engine.jpg |[[British Racing Motors|BRM]] H-16 engine (64-valve version)
</gallery>

=== Motorcycle engines ===
[[File:Brough Superior Golden Dream (close up).JPG|thumb|Brough Superior H-4 motorcycle engine]]
The [[Brough Superior Golden Dream]] motorcycle, first shown in 1938.<ref>{{cite book|last=Wilson|first=Hugo|title=The Encyclopedia of the Motorcycle|chapter-url=https://archive.org/details/encyclopediaofmo00wils_1|chapter-url-access=registration|year=1995|publisher=Dorling Kindersley|location=London|isbn=0-7513-0206-6|pages=[https://archive.org/details/encyclopediaofmo00wils_1/page/34 34–35]|chapter=Brough Superior Dream}}</ref> A 1,000&nbsp;cc H-4 design and a few units were produced in early 1939. Any development planned was interrupted by World War II and subsequent years of austerity.

[[Wooler (motorcycles)|Wooler]] built a motorcycle prototype with a similar configuration to the Brough Superior Golden Dream and exhibited it at the [[British International Motor Show]] at [[Earls Court Exhibition Centre]] in 1948 and again in 1951. This was replaced by a [[flat-four engine]]d prototype at the 1953 show.

=== Powerboat racing engines ===
{{refimprove section|small=yes|date=November 2019}}
German firm Konig, who specialised in racing outboard motors,<ref>{{cite web |title=Quincy vs Konig |url=http://www.quincylooperracing.us/gpage8.html |website=www.quincylooperracing.us |access-date=16 November 2019}}</ref> built a few 1000cc  H-8s in the 1970s, which were basically two of their VC500 flat fours mounted one above the other, with the direction of rotation reversed on one of them. Each half of the engine was a water cooled 2-stroke with rotating disc valve driven by a toothed belt via two 45/90 degree pulleys, plus two siamesed expansion chamber exhausts, fed by two single choke carbs. Both cylinders at each end of each engine fired at the same time, hence the siamesed exhausts for each pair.