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Summary and Analysis

By Environmental Protection Agency

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Book Id: WPLBN0000217302
Format Type: PDF eBook
File Size: 1.1 MB
Reproduction Date: 2007

Title: Summary and Analysis  
Author: Environmental Protection Agency
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Publication Date:
Publisher: United States Environmental Protection Agency


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Agency, E. P. (n.d.). Summary and Analysis. Retrieved from

Excerpt: On October 5, 2001, EPA published a Notice of Proposed Rulemaking (NPRM) which put forth proposed emission standards and test procedures for large spark-ignition (SI) engines; recreational vehicles using spark-ignition engines such as off-highway motorcycles, all-terrain vehicles, and snowmobiles; and recreational marine diesel engines. For large SI engines, a twophase program was proposed. The first phase of the standards, to go into effect in 2004, will reduce combined HC and NOx emissions by nearly 75 percent, based on a steady-state test. These standards will be supplemented in 2007 by setting limits that will require optimizing the same technologies, but emission measurements will be based on a transient test cycle, new requirements for evaporative emissions and engine diagnostics will also start during this phase. For snowmobiles, the Agency proposed adopting a first phase of standards for HC and CO emissions based on clean carburetion or 2-stroke electronic fuel injection (EFI) technology, and second phase of emission standards that will involve significant use of direct fuel injection 2- stroke technology, as well as possible limited conversion to 4-stroke engines. For off highway motorcycles and all-terrain vehicles, the Agency proposed standards that will reduce emissions by 50 percent, based mainly on moving these engines from 2-stroke to 4-stroke technology and second phase of standards for all-terrain vehicles that will require some catalyst use. For recreational marine diesel engines we proposed standards similar to the existing standards for commercial marine diesel engines.


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