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Author Hilbert, David.

Title High ethanol fuel endurance [electronic resource] : a study of the effects of running gasoline with 15% ethanol concentration in current production outboard four-stroke engines and conventional two-stroke outboard marine engines : June 16, 2010-June 30, 2011 / David Hilbert, Mercury Marine.

Imprint Golden, Colo. : National Renewable Energy Laboratory, [2011]


Location Call No. OPAC Message Status
 Axe Federal Documents Online  E 9.18:NREL/SR-5400-52909    ---  Available
Description 1 online resource (52 p.) : col. ill.
Series NREL/SR ; 5400-52909
NREL/SR ; 5400-52909.
System Details Full text available via Internet in .pdf format. Adobe Acrobat Reader required.
Type Of Report Subcontract report.
Note Title from title screen (viewed Nov. 3, 2011).
"October 2011."
"Prepared under Subcontract No. NFM-0-40044-01."
Bibliography Includes bibliographical references (p. 52).
Summary Three Mercury Marine outboard marine engines were evaluated for durability using E15 fuel - gasoline blended with 15% ethanol. Direct comparison was made to operation on E0 (ethanol-free gasoline) to determine the effects of increased ethanol on engine durability. Testing was conducted using a 300-hour wide-open throttle (WOT) test protocol, a typical durability cycle used by the outboard marine industry. Use of E15 resulted in reduced CO emissions, as expected for open-loop, non-feedback control engines. HC emissions effects were variable. Exhaust gas and engine operating temperatures increased as a consequence of leaner operation. Each E15 test engine exhibited some deterioration that may have been related to the test fuel. The 9.9 HP, four-stroke E15 engine exhibited variable hydrocarbon emissions at 300 hours - an indication of lean misfire. The 300HP, four-stroke, supercharged Verado engine and the 200HP, two-stroke legacy engine tested with E15 fuel failed to complete the durability test. The Verado engine failed three exhaust valves at 285 endurance hours while the 200HP legacy engine failed a main crank bearing at 256 endurance hours. All E0-dedicated engines completed the durability cycle without incident. Additional testing is necessary to link the observed engine failures to ethanol in the test fuel.
Funding DE-AC36-08GO28308
Subject Marine engines -- Fuel consumption.
Outboard motors -- Fuel consumption.
Ethanol as fuel -- Research.
Spark ignition engines -- Alternative fuels -- Research.
Added Author Brunswick Corporation. Mercury Marine.
National Renewable Energy Laboratory (U.S.)
Gpo Item No. 0430-P-05 (online)
Sudoc No. E 9.18:NREL/SR-5400-52909

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