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A Bench Test Study of Port Fuel Injection Fouling
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 23, 2008 by SAE International in United States
Annotation ability available
ASTM method D 6421, “Standard Test Method for Evaluating Automotive Spark-Ignition Engine Fuel for Electric Port Fuel Injectors Fouling by Bench Procedure”, was developed by South West Research Institute (SWRI) and the procedure standardized by the Coordinating Research Council (CRC) in 1999. The method has the potential to be a cost-effective tool for evaluating additive and fuel effects on port fuel injector performance. However, the Bosch injectors specified in the test procedure are no longer commercially available and in practice, obtaining repeatable and reproducible results using Bosch injectors can be difficult.
This paper reports on bench test apparatus and test procedure modifications directed at obtaining better repeatability and responsiveness to fuels and additive chemistry. These modifications allow for better control of test-to-test injector tip temperature and keep the temperature closer to the injector soak temperature. Evaluation of injector-to-injector variability has led to the identification of Honda pintle style injectors as replacements for the Bosch injectors. Further study found that non-weeping injectors have fouling at test conditions. The initial injector flow rate, however, does not affect the injector fouling tendency
Use of different source of fuel injectors was determined to have advantages of not requiring pre-screening for fouling capability, improved test repeatability, and good response to base fuel and additive chemistries compared to using Bosch injectors specified in the standard test.
CitationHou, P., Nichols, T., Miller, K., and Bennett, J., "A Bench Test Study of Port Fuel Injection Fouling," SAE Technical Paper 2008-01-1593, 2008, https://doi.org/10.4271/2008-01-1593.
- CRC Report No. 565 “A Program to Evaluate a Vehicle Test Method for Port Fuel Injector Deposit-Forming Tendencies of Unleaded Base Gasolines” February 1989
- “Standard Test Method for Evaluating Unleaded Automotive Spark-Ignition Engine Fuel for Electronic Port Fuel Injector Fouling”
- CRC Report No. 617 “Port Fuel Injector Bench Test Method, Interlaboratory Study, and Vehicle Test Correlation” March 1999
- Megnin Martin Evans Beth Koehler Don Kohl Karen Naylon John “The CRC Port Fuel Injector Bench Test Method, Interlaboratory Study, and Vehicle Test Correlation” SAE Paper No. 1999-01-1548 May 1999
- “Standard Test Method for Evaluating Automotive Spark-Ignition Engine Fuel for Electronic Port Fuel Injector Fouling by Bench Procedure”
- Caracciolo Frank Stebar Russell F. “An Engine Dynamometer Test for Evaluating Port Fuel Injector Plugging” SAE Paper No. 872111 November 1987
- Bensen J.D. Yaccarino P.A. “The Effects of Fuel Composition and Additives on Multiport Fuel Injection Deposits” SAE Paper No. 861533 1986
- Richardson Charles B. Gyorog Donald A. Beard Loren K. “A Laboratory Test for Fuel Injector Deposit Studies” SAE Paper No. 892116 September 1989
- Whitehead Michael A. Buckingham Janet P. Brunner J. Kevin “The Port Fuel Injector Deposit test - A Statistical Review” SAE Paper No. 982713 October 1998
- Mendenhall William Sincich Terry “Statistics for Engineering and Science” Third Dellen Publishing Company San Francisco 1992