CRC pilot program to investigate the effect on driveability of intake valve deposits and variations in fuel volatility

Technical Report · Tue Jun 01 00:00:00 EDT 1993

OSTI ID:5964853

During the Coordinating Research Council's (CRC) program to select an engine to replace the BMW 318i as the industry standard intake valve deposit test engine, an opportunity was identified to compare the driveability performance of the engines evaluated with and without intake valve deposits. A pilot program was thus conducted by the CRC Volatility Group at Southwest Research Institute during late 1 991 and early 1 992 to investigate the relationship between intake valve deposits and cold-start and warmup driveability. Eight vehicles were tested using three fuels with varying T50 levels. Duplicate ratings were made using both the BMW Driveability Test Procedure and a modification of the CRC Cold-Start and Warmup Driveability Procedure. None of the three candidate engines were as good as the BMW 318i reference engine in discriminating valve deposit effects on driveability. Rater differences obscured other possible effects.

• Research Organization: Coordinating Research Council, Inc., Atlanta, GA (United States)
• OSTI ID: 5964853
• Report Number(s): AD-A-267401/8/XAB; CRC--579
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330603 -- Vehicle Design Factors-- Engine System
ADDITIVES
AUTOMOTIVE FUELS
CONTROL EQUIPMENT
DATA
ENGINES
EQUIPMENT
EVALUATED DATA
FLOW REGULATORS
FUELS
HEAT ENGINES
INFORMATION
INTERNAL COMBUSTION ENGINES
NUMERICAL DATA
STANDARDS
STATISTICAL DATA
VALVES
VARIATIONS
VEHICLES
VOLATILITY