ISO 8178-7:2015 PDF

Overview

ISO 8178-7:2015 defines the parameters and procedures used to determine which reciprocating internal combustion engines may be grouped into an engine family and how to select the parent engine for emissions testing. The part applies to non-road engines for land, rail traction and marine use (excluding on-road vehicles) and supports manufacturers and approval authorities in reducing the number of engines that require full emissions testing while ensuring compliance with emission limits.

Key Topics

• Scope and responsibilities: The manufacturer identifies candidate engines, proposes family membership and provides technical justification. Parties involved (manufacturer and approval authority) agree the final family and parent-engine selection.
• Parameters defining an engine family: Basic characteristics that must be common to family members include:
  • Combustion cycle (two-stroke, four-stroke, rotary, etc.)
  • Main cooling medium (air, water, oil)
  • Individual cylinder displacement: for unit displacement ≥ 0.75 dm3, members shall be within 85%–100% of the largest; for