Spark-Ignition Marine Engines and Watercraft (SIME/SIMW)

This page last reviewed August 29, 2017

Introduction

image of boat

ARB's recreational marine engine program is an important new element in ARB's efforts to improve air quality through reductions of hydrocarbon (HC) and oxides of nitrogen (NOx) emissions. Regulations have been adopted for certain marine vessels and regulations have been proposed for other spark-ignition engines used in boats for propulsion. Commercial marine engines are covered under the Commercial Marine Vessel webpage. Spark-ignition auxiliary marine engines (power generators, winches, or auxiliary propulsion engines for sail boats) are defined as small off-road spark-ignition engines (below 25 horsepower) or large off-road spark-ignition engines (25 horsepower and greater) depending on their size. Compression-ignition auxiliary and propulsion marine engines under 50 horsepower are defined as off-road diesel (compression-ignition) engines.

Latest Update: September 13, 2017
  • TP-1505-A (Alternative leak test procedure) has been approved for use in certifying SIMW pressure relief valves for diurnal control. You can view the approved test procedure here.





Recent Updates and Events
Formal Regulatory Documents

Component and Engine Certifications

Workshops/Meetings

News Archive


Regulatory Documents

Regulatory History


Watercraft Evaporative Certification

Component Executive Orders

Test Procedures




SIME/SIMW Certification Materials
SIME/SIMW FAQs


Related Links

SIME/SIMW Certification Materials

SIME/SIMW FAQs


Off-Road Certification Database


Keep Me Posted

If you are interested in receiving updates and public annoucements regarding ARB's SIME/SIMW regulatory programs, please click on the link in the left margin labeled "Join the SIME/SIMW E-Mail List" and enter your contact information.

SIME/SIMW Emissions Rulemaking Contacts

  • Exhaust Emissions Lead:  Jeff Lowry (626) 575-6841
  • Evaporative Emission Component Certification:  Michele Dunlop (916) 323-8971
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