Andrew; Before retiring, among other things, I did technical training for an industrial vehicle manufacturer... pretty much specializing in diesel engine training. I was a certified tech for both Cummins and Yanmar.
Based on what I know to be true at the time of retirement, I'd say you should have no real worries. Here's some basics on emissions requirements: Basically, emissions requirements are international standards. The current Tier IV levels are basically the same everywhere. The difference by region mostly have to do with when the standards become active. Europe is generally a year or so ahead of the US. And Canada lags a year behind. Different sizes of engines and different applications have different effective dates, with on road applications and larger engines coming first, smaller engines, small marine and non-mobile (like generator and pump) applications come later. One of the anomalies (at least to me) is that large marine and locomotive applications seem to be about the last class implemented. The standards become increasingly more restrictive. The regulations levels are referred to as "Tiers" in the US and Canada. Tier I was effective in the 90s. Tier II from 2002 to 2007. Tier III from 2010 to 2012. Tier 4 from 2013 to 2015. And Tier V will kick in between 2019 and 2022. CARB emissions standards are, indeed, fussier than the normal standards - but the differences are mostly in spark ignition (gas, propane, etc.) engines and on road diesels. CARB allows lower levels of COx (unburned hydrocarbons and carbon monoxide) and NOx (nitrous oxides) because that is what makes smog. CARB also requires very low levels of particulate emissions for on-road vehicles - which has ended up with particle filters in the exhaust systems of some trucks and busses sold in California. CARB also regulates small engines under 25HP (19KW) and hand held applications (like weed whackers) that are not covered by the normal Tier 1-V standards. A diesel engine is inherently much cleaner than a spark ignition engine. Higher combustion pressures and temperatures mean very low unburned hydrocarbons and carbon monoxide levels. Increasingly precise injector controls (like the high pressure common rails injection with computer controls used on the Cummins and Ford engines - and maybe on Yanmar Tier IV or Tier V) take care of the particulates. The bugaboo for diesel emissions is NOx. The atmosphere is about 80% Nitrogen, and the higher the combustion temperature, the more likely you are to create NOx. Computer controls on the injected fuel, to precisely manage the air/fuel ratio in a very narrow range, limit the amount of free oxygen (not used to burn fuel) available to form NOx. Basically, there is a CARB compliant sticker on your engine because there has to be a sticker if one is to sell the engine in California. The engine for CARB, the rest of the US, and most likely Canada and Europe are likely mechanically identical (except there is probably not a CARB label on the European engine). I suspect you will find that the performance and fuel economy (and certainly the reduced particulate smoke) to be better than what you had from your old Yanmar. Just be sure to clean out the exhaust elbow every year. Rick Brass Washington, NC -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Andrew Burton via CnC-List Sent: Thursday, August 17, 2017 12:42 PM To: cnc-list@cnc-list.com Cc: Andrew Burton <a.burton.sai...@gmail.com> Subject: Stus-List Emission controls Well, I finally got tired of fixing my engine every time I went out (or so it seemed), not to mention dealing with all the diesely rust under and around the thing. So I have gone for a brand new Yanmar 3YM30AE. It goes in this afternoon. It's pretty and shiny gray and I think I love it. However, I notice on one of the labels that it qualifies with all California emissions requirements. What does that mean in the real world (you know, the part that isn't in California)? I can't help thinking that it means seriously reduced efficiency and power. Running around with a 20-gallon fuel tank, that is a serious consideration. Can the assembled intelligence here give me some insight into what this means? Cheers Andy C&C 40 Peregrine Andrew Burton 61 W Narragansett Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ +401 965-5260 _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
