SAE technical papers on CD-ROM/SAE technical paper series · 1994 · 10 citations · 4 references
<div class="htmlview paragraph">The Coordinating Research Council (CRC) Intake Valve Deposit Group is evaluating a dynamometer based test to rank fuels for their relative tendency to form intake valve deposits. The Ford 2.3L OHC, dual spark plug equipped engine was previously selected (<span class="xref">1</span><span class="xref">*</span>) for use in the current test program to determine optimum test conditions.</div> <div class="htmlview paragraph">A fifteen test design of experiments was constructed to reproduce intake valve deposit weight and morphology, representative of that causing field driveability problems. Test results were analyzed and a two-mode composite test was deduced from deposit weights, visual ratings, observations on the test valves and thermogravimetric analysis (TGA) results.</div> <div class="htmlview paragraph">Once the test was optimized, an additional ten test matrix was conducted to assess both repeatability and the performance of the test over a range of deposit levels. Base fuel and base fuel + two additive combinations were tested to provide a range of deposit tendencies.</div>
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