PL61 Pipelayer Engine Model Cat C4.4 Flywheel Power 130 HP Cat C4.4 ACERT Emissions U.S. EPA Tier 4 Final/EU Stage IV/Korea Tier 4 Final View Specifications PL72 Pipelayer Engine Model Cat® C9.3 ACERT™ Flywheel Power 212 hp Engine Power (Maximum) 257 hp View Specifications PL83 Pipelayer Engine Model Cat® C15 ACERT™ Flywheel Power 319 hp U.S. EPA Tier 4 Final/EU Stage IV: Net Power 323 hp View Specifications PL87 Pipelayer Engine Model Cat® C15 ACERT™ Flywheel Power 319 hp U.S. EPA Tier 4 Final/EU Stage IV: Net Power 323 hp View Specifications