Formation of Intake Valve Deposits in Gasoline Direct Injection Engines

Paper #:
  • 2016-01-2252

Published:
  • 2016-10-17
DOI:
  • 10.4271/2016-01-2252
Citation:
Guinther, G. and Smith, S., "Formation of Intake Valve Deposits in Gasoline Direct Injection Engines," SAE Int. J. Fuels Lubr. 9(3):558-566, 2016, doi:10.4271/2016-01-2252.
Pages:
9
Abstract:
Gasoline direct-injection (GDI) engines have a well-known propensity to form intake valve deposits (IVD), regardless of operator service, engine architecture, or cylinder configuration. Due to the lack of a fuel-washing process that is typical of Port Fuel Injected (PFI) engines, the deposits steadily accumulate over time and can lead to deterioration in combustion, unstable operation, valve-sticking, or engine failure. Vehicles using these engines are often forced to undergo expensive maintenance to mechanically remove the deposits, which eventually re-form. The deposit formation process has not been well-characterized and there is no standardized engine test to study the impact of fuel or lubricant formulation variables. To meet this need, a proprietary vehicle-based GDI-IVD test that is both repeatable and responsive to chemistry has been developed. Using a vehicle equipped with a 2.0L turbo GDI engine, the mechanisms leading to deposit formation have been studied and analyzed, and found to be a combination of engine oil, engine-wear elements, unburned fuel, and exhaust gas contaminants. The rate of accumulation was also found to be affected by engine lubricant formulation variables.
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