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DTIC ADA190697: Development of a Laboratory Test for Multiport Injector Deposits: Approaches 1 and 2.

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

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