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E15 Outboard Marine High Ethanol Fuel Endurance

Study on the impact of 15% ethanol fuel on outboard marine engines, evaluating performance, carbon deposits, and material wear over 300 hours. Conclusions highlight issues and recommend further testing for lubrication and driveability.

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E15 Outboard Marine High Ethanol Fuel Endurance

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  1. E15 Outboard Marine High Ethanol Fuel Endurance A study of the effects of running gasoline with 15% ethanol concentration in current production outboard four-stroke marine engines and conventional two-stroke outboard marine engines. Prepared By: David Hilbert

  2. Overview • Test Objective: Run 300 hours of wide-open throttle (WOT) endurance on 3 engine families. • Two engines from each family: One on E15 (15% ethanol blend fuel) and the other on pure gasoline. • 9.9HP 4-stroke carbureted, • 300HP Supercharged 4-stroke “Verado”, • 200HP 2.5L 2-stroke EFI (represents “legacy” product) • Engine selection was reviewed and approved by NREL Technical Monitor • Test standards used were common qualification tests. • Test regimen was reviewed and approved by NREL Technical Monitor

  3. 9.9HP Carbureted 4-Stroke • More carbon deposits on piston underside and rods of E15 engine. E0 E15

  4. 9.9HP Carbureted 4-Stroke • The fuel pump gasket showed signs of deterioration on the E15 engine compared with the E0 (pure gasoline) engine. E15 E0 • Material transfer from gasket to check valve in fuel pump.

  5. 300HP Supercharged 4-Stroke “Verado” Cylinder 3 Bottom Valve Cylinder 3 Top Valve Cylinder 6 Top Valve

  6. 300HP Supercharged 4-Stroke “Verado” • Carbon deposits may indicate that the E15 engine’s pistons and connecting rods were hotter during operation than those in the E0 engine. E15 E0

  7. 200HP EFI 2.5L 2-Stroke Recovered Pieces from Failed Rod Bearing Undamaged Bearing Undamaged Rod Damaged Rod

  8. Conclusions and Recommendations Summary • Despite the limited scope of the project several significant issues were discovered. • More testing is necessary to understand effects on: • Lubrication system in 2-stroke engines • “Driveability”- Examples: cold and hot start, acceleration, deceleration, etc. • Similar testing by Volvo Penta indicated difficulty starting the E15 engine.1 • Storage (phase separation, corrosion, etc.) Source 1: M. Cahoon, R. Kolb, and G. Zoubul, Volvo Penta 4.3 LG E15 Emissions and Durability Test, NREL SR-5400-52577, October 2011

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