Standard

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Submitted By entezarim
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Chapter 4: Feasibility of Proposed Standards

CHAPTER 4: Feasibility of Proposed Standards
Section 213(a)(3) of the Clean Air Act presents statutory criteria that EPA must evaluate in determining standards for nonroad engines and vehicles. The standards must "achieve the greatest degree of emission reduction achievable through the application of technology which the Administrator determines will be available for the engines or vehicles to which such standards apply, giving appropriate consideration to the cost of applying such technology within the period of time available to manufacturers and to noise, energy, and safety factors associated with the application of such technology." This chapter presents the technical analyses and information that form the basis of EPA's belief that the proposed emission standards are technically achievable accounting for all the above factors.

4.1 CI Recreational Marine
The proposed emission standards CI recreational marine engines are summarized in the Executive Summary. We believe that manufacturers will be able to meet these standards using technology similar to that required for the commercial marine engine standards. This section discusses technology currently used on CI recreational marine engines and anticipated technology to meet the proposed standards. In addition, this section discusses the emission test procedures and not-to-exceed requirements. 4.1.1 Baseline Technology for CI Recreational Marine Engines We developed estimates of the current mix of technology for CI recreational marine engines based on data from the 1999 Power Systems Research (PSR) database and from conversations with marine manufacturers. Based on this information, we estimate that 97 percent of new marine engines are turbocharged, and 80% of these turbocharged engines use aftercooling. The majority of these engines are four-strokes, but about…...

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