Standard Test Method for Dynamometer Evaluation of Unleaded Spark-Ignition Engine Fuel for Intake Valve Deposit Formation
5.1 Test Method—The Coordinating Research Council sponsored testing to develop this test method to evaluate a fuel's tendency to form intake valve deposits.
5.1.1 State and Federal Legislative and Regulatory Action—Regulatory action by California Air Resources Board (CARB)9 and the United States Environmental Protection Agency (EPA)10 necessitate the acceptance of a standardized test method to evaluate the intake system deposit forming tendency of an automotive spark-ignition engine fuel.
5.1.2 Relevance of Results—The operating conditions and design of the engine used in this test method are not representative of all engines. These factors shall be considered when interpreting test results.
5.2 Test Validity:
5.2.1 Procedural Compliance—The test results are not considered valid unless the test is completed in compliance with all requirements of this test method. Deviations from the parameter limits presented in Sections 12 – 14 will result in an invalid test. Apply engineering judgment during conduct of the test method when assessing any anomalies to ensure validity of the test results.
5.2.2 Engine Compliance—A test is not considered valid unless the test engine meets the quality control inspection requirements as described in Sections 10 and 12.
1.1 This test method covers an engine dynamometer test procedure for evaluation of intake valve deposit formation of unleaded spark-ignition engine fuels.2 This test method uses a Ford Ranger 2.3 L four-cylinder engine. This test method includes detailed information regarding the procedure, hardware, and operations.
1.2 The ASTM Test Monitoring Center (TMC)3 is responsible for engine test stand calibration as well as issuance of information letters after test method modifications are approved by Subcommittee D02.A0 and Committee D02. Users of this test method shall request copies of recent information letters from the TMC to ensure proper conduct of the test method.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given throughout this test method.
1.5 This test method is arranged as follows:
Summary of Test Method
Significance and Use
Engine and Cylinder Head Build-Up and Measurement Area
Engine Operating Area
Fuel Injector Testing Area
Intake Valve Rinsing and Parts Cleaning Area
Parts Rating and Intake Valve Weighing Area
Test Stand Laboratory Equipment
Test Stand Configuration
Dynamometer Speed and Load Control System
Intake Air Supply System
Fuel Supply System
Engine Control Calibration
Engine Coolant System
External Oil System
Temperature Measurement Equipment and Locations
Pressure Measurement Equipment and Locations
Flow Measurement Equipment and Locations
Speed and Load Measurement Equipment and Locations
Exhaust Emissions Measurement Equipment and Location
DPFE (EGR) Voltage Measurement Equipment and Location
Ignition Timing Measurement Equipment and Location
Test Engine Hardware
Test Engine Parts
New Parts Required
Reusable Engine Parts
Special Measurement and Assembly Equipment
Reagents and Materials
Preparation of Apparatus
Test Stand Preparation
Engine Block Preparation
Preparation of Miscellaneous Engine Components
Cylinder Head Preparation
Cylinder Head Assembly
Cylinder Head Installation
Final Engine Assembly
Test Stand Calibration
Engine Operating Procedure
Periodic Measurements and Functions
End of Test Procedures
Determination of Test Results
Post-Test Intake Valve Weighing Procedure
Photographs of Parts—General
Induction System Rating
Determination of Test Validity-Engine Conformance
Precision and Bias
Detailed Specifications and Photographs of Apparatus
Engine Part Number Listing
Statistical Equations for Mean and Standard Deviation
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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