b'(pg. 63), the lowest sector is for displacements under 0.9L/ available in that power range. This is true unless you can cylinder and maximum engine power at less than 8kW, soprove that engine will not work in your application for the everything less than Tier 4 right on down to the smallestreasons outlined in the regulations. At this time, it is not marine diesel engine available is included. There are someknown how CARB will react to waiver requests for Tier waiver and extension opportunities, but nothing will go3 engines between 600 and 805bhp. The regulation also beyond Dec. 31, 2034. It looks like 2035 will be a busy yearreferences Tier 4 final off-road certified engines that have in shipyards. been marinized to U.S. Coast Guard requirements. This is not something commonly used in passenger vessels but is Why did I state everything less than Tier 4 instead of justused in other sectors of CHC.saying all engines less than 600kW or 805bhp? Here is the trap: the new CHC regulations differ from EPA regula- DPFsareexactlywhattheysoundlike.Theyare tions in that you must install the engine that is certifiednon-combustible filters that trap most particulate mat-to the most stringent marine standards (Tier 3, 4 or Tierter (PM) emissions from the diesel engine. There are two 4 final off-road). As an example, there is one marine en- distinctly different classes of DPs, passive and actively gine manufacturer that currently has an engine certified toregenerating.Whatdoesregeneratingmeanforyour EPA Tier 4 down to 441kW or 600bhp. Therefore, in Cal- DPF? The DPF traps PM until the engine exhaust system ifornia, if you want to install an engine rated at 600bhp,back pressure gets too high and then the filter regener-or one of the other ratings between 600 and 805bhp, youates by burning out all the accumulated PM so that the must install that specific engine as it is the only one knownfilter is no longer restricted. A passive DPF does this with to be certified to the most stringent marine standardhigh exhaust system temperatures associated with higher Experience Superior Target Detection!YOUR CHILLER EXPERTS SINCE 1995!For the most rugged and reliable commercial/militaryquality chillers available choose Flagship Marine,proudly manufactured in the USA with domestic alloys only.FAR3220BBNXTRugged, reliable, If you want allSolid State X-Band transceiver generates clear echo and simple design.the bells and images, even from small targetsIndestructible, whistles wenaturallysupply the fullLess maintenance than magnetron Radarsantimicrobialline of WebastoEnhanced side conningCuNi heavy walledchillers and See even more useful information with optionalcondensers. other products.Widescreen MonitorsReliable situational awarenesswith unbeatable target detection! State Of The Art Marine Air Conditioning Systems3211 SE Gran Park Way, Stuart, Florida 34997 www.flagshipmarine.comwww.itrmarine.com www.FurunoUSA.com 772-283-1609sales@flagshipmarine.com11 JULY 2023'