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IM240 Repair Verification: An Inexpensive Dynamometer Method
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English
Abstract
An inexpensive system was designed that would allow repair shops to verify the adequacy of repairs made to cars that had previously failed the new high-tech I/M test (IM240). Before and after repair tests on a limited number of vehicles were performed with both official IM240 and prototype repair grade (RG240) equipment systems. Analyses were performed to determine if the RG240 system concept is capable of determining if the repairs performed resulted in adequate emissions reductions to assure a passing IM240 retest. This study focuses on development of a prototype RG240 system consisting of a 100 SCFM CVS, a dynamometer with an eddy current power absorber and non-adjustable 2000 pound inertia flywheel, and a BAR 90 emissions analyzer with an additional nitric oxide analyzer.
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Citation
Mickelsen, J. and Clemmens, W., "IM240 Repair Verification: An Inexpensive Dynamometer Method," SAE Technical Paper 940431, 1994, https://doi.org/10.4271/940431.Also In
References
- “Inspection/Maintenance Program Requirements” Federal Register 57 215 November 5 1992
- Pidgeon, W. Dobie, N. “IM240 Transient I/M Dynamometer Driving Schedule and the Composite I/M Test Procedure” January 1991
- “High-Tech I/M Test Procedures, Emissions standards, Quality Control Requirements, and Equipment Specifications” Revised Technical Guidance July 1993