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High ethanol fuel endurance : 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.
- Format:
- Book
- Government document
- Author/Creator:
- Hilbert, David.
- Series:
- NREL/SR ; 5400-52909.
- NREL/SR ; 5400-52909
- Language:
- English
- Subjects (All):
- Marine engines--Fuel consumption.
- Marine engines.
- Outboard motors--Fuel consumption.
- Outboard motors.
- Ethanol as fuel--Research.
- Ethanol as fuel.
- Spark ignition engines--Alternative fuels--Research.
- Spark ignition engines.
- Genre:
- technical reports.
- Technical reports
- Technical reports.
- Physical Description:
- 1 online resource (52 pages) : color illustrations.
- Place of Publication:
- Golden, Colo. : National Renewable Energy Laboratory, [2011]
- 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.
- Notes:
- Title from title screen (viewed Nov. 3, 2011).
- "October 2011."
- "Prepared under Subcontract No. NFM-0-40044-01."
- Includes bibliographical references (page 52).
- OCLC:
- 759518104
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