Accession Number : ADA190697

Title :   Development of a Laboratory Test for Multiport Injector Deposits: Approaches 1 and 2.

Descriptive Note : Final rept.,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Stavinoha, L L ; Estefan, R M ; Marbach, H W , Jr

PDF Url : ADA190697

Report Date : Sep 1987

Pagination or Media Count : 56

Abstract : This report evaluates a novel approach for measuring MPFI(Multiport Fuel Injectors) injector deposit-forming tendencies of fuel. By slowly coating a cylindrical metal surface with a thin film of gasoline and applying sufficient amounts of heat in alternate cycles of coating and 'soaking', two critical requirements of deposit formation were used. The deposit generated from a known injector-fouling fuel (fuel A) were measured gravimetrically and compared to a relatively 'clean' fuel (fuel C). Significantly greater concentrations of deposits were measured from fuel A when compared to fuel C. Fuel A was treated with 2 different types of additives-polymeric and amine-from 4 different manufacturers at high, clean-up levels and low, keep-clean concentrations and evaluated by the Bomb Method. Very few deposits were measured by any of the additive-treated fuels at high or low treatment levels. Greatly reduced levels of each additive in fuel A were tested for additive response by measuring deposit formation of as a function of additive concentration. Several additives appeared to begin losing their efficacy at lower concentrations in fuel A. With an improved design of the delivery system and optimization of experimental parameters, the Bomb Method promises to be a viable bench test method for measuring the deposit-forming tendencies of fuel.

Descriptors :   *DEPOSITS, *GASOLINE, *FUEL INJECTION, ADDITIVES, BENCH TESTS, CYLINDRICAL BODIES, LABORATORY TESTS, MEASUREMENT, METALS, OPTIMIZATION, REQUIREMENTS, SURFACES, TEST METHODS, THIN FILMS, COMBUSTION, CARBURETORS

Subject Categories : Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE