| 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 |
|
