| 词条 | Gray Marine 6-71 Diesel Engine |
| 释义 |
The 6-71 Gray Marine Diesel Engine is a marinized version of the General Motors Detroit Diesel 6-71 engine produced by the Gray Marine Motor Company. It was used in landing craft during World War II and is used today in private boats and training facilities. Engine characteristicsThe 6-71 is an inline six cylinder diesel engine.[1] The 71 refers to the displacement in cubic inches of each cylinder.[1] The firing order of the engine is 1-5-3-6-2-4.[1] The engine's compression ratio is 18.7:1 with a 4.250 inch bore and a 5.00 inch stroke.[1] The engine weighs {{convert|2185|lb|kg|abbr=on}} and is 54 inches long, 29 inches wide and 41 inches tall.[1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts).[1] V-type versions of the 71 series were developed in 1957. The 6-71 is a two stroke engine.[2] As the engine will not naturally aspirate, air is provided via a roots-type supercharger.[3] However, on the 6-71T models, a turbocharger and a supercharger are utilized.[2] Fuel is provided by unit injectors, one per cylinder.[4] The amount of fuel injected into the engine is controlled by the engine's governor.[1] The engine cooling is via liquid in a water jacket. In a boat, cool external water is pumped into the engine and passed through a heat exchanger mounted on or nearby in a "double loop" configuration.[4] DevelopmentThe Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. Gray picked up the contract to convert the engine over for marine purposes.[5] UseThe 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II.[6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3] References{{Commons category|Gray marine engines}}1. ^1 2 3 4 5 6 {{cite web|last=Barrington Diesel club|title=Detroit Diesel 6-71 engine specs at Barrington Diesel Club|url=http://www.barringtondieselclub.co.za/671DetroitDiesel.html|accessdate=11 April 2012|deadurl=yes|archiveurl=https://web.archive.org/web/20120308222058/http://www.barringtondieselclub.co.za/671DetroitDiesel.html|archivedate=8 March 2012|df=}} 2. ^1 {{cite web|last=Tugboat Enthusiasts Society of the Americas|title=DETROIT DIESEL INLINE 71 SERIES|url=http://www.tugboatenthusiastsociety.org/Pages/tugmach-diesel-modern-DD71-01.htm|accessdate=11 April 2012}} 3. ^1 {{cite web|last=Caprio|first=Dennis|title="Jimmy" Rules: Detroit Diesel 6-71|url=http://www.yachtingmagazine.com/gear/equipment/jimmy-rules-detroit-diesel-6-71|work=Yachting Magazine|accessdate=18 April 2012}} 4. ^1 {{cite book|title=G.M. Grey Marine Model 64 HN9|publisher=Hatch and Kirk INC.|location=Seattle, Washington|url=http://www.cg83527.org/DD671Manual.htm}} 5. ^{{cite web|last=Homfield|first=Max|title=A Brief History of Gray Marine Engines|url=http://gasengine.farmcollector.com/gas-engines/gray-marine-engines-history.aspx?page=3|work=Gas Engine Magazine|accessdate=18 April 2012}} 6. ^{{cite book|last=Grayson|first=Stan|title=Engines Afloat|year=1999|publisher=Devereux Books|isbn=0-9640070-7-X}} 3 : Marine diesel engines|Detroit Diesel engines|Two-stroke diesel engines |
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