Wärtsilä's new 31 becomes the most efficient 4-stroke diesel engine in the world

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href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/author/loz-blain/" rel="author">Loz Blain</a> - June 22, 2015 </span> <a class="picture-count" href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures"> 4 Pictures </a> </div> </div> <div class="inline-item"> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/hero/wartsila-31-worlds-most-efficient-diesel-engine.jpg" data-at2x="https://web.archive.org/web/20150627082639/http://images.gizmag.com/hero/wartsila-31-worlds-most-efficient-diesel-engine@2x.jpg" alt="The name Wärtsilä 31 refers to its 31 cm piston bore" class="hero-img"/> </a> <div class="caption caption--hero"> <p> The name Wärtsilä 31 refers to its 31 cm piston bore (Credit: Wärtsilä) </p> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures" class="gallery-link">Image Gallery</a> (4 images) </div> </div> <div class="article-body"> <p>Finnish engine manufacturer Wärtsilä must be a fascinating place to visit. The company manufactures some of the most mind-bendingly enormous marine diesel engines in the world, like the record-breaking, <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/go/3263/" target="_blank">89-foot high, 44-foot long, 110,000 horsepower RTA96-C</a> we wrote about more than 10 years ago. Now, Wärtsilä has another entry in the Guinness Book of Records ... for the world's most efficient 4-stroke diesel engine.</p> <ul class="thumbnails"> <li> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures#1"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/gallery_tn/wartsila-31-worlds-most-efficient-diesel-engine-1.jpg" title="Wärtsilä 31 – the world's most efficient diesel 4-stroke engine" alt="Wärtsilä 31 – the world's most efficient diesel 4-stroke engine"/> </a> </li> <li> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures#2"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/gallery_tn/wartsila-31-worlds-most-efficient-diesel-engine-2.jpg" title="Wärtsilä 31 – dimensions and specifications" alt="Wärtsilä 31 – dimensions and specifications"/> </a> </li> <li> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures#3"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/gallery_tn/wartsila-31-worlds-most-efficient-diesel-engine-4.jpg" title="Standing 15 feet high, the Wärtsilä 31 is unlikely to find its way into a drag race car" alt="Standing 15 feet high, the Wärtsilä 31 is unlikely to find its way into a drag race car"/> </a> </li> </ul> <p>Designed for medium-sized ferries and cruise ships, or small to medium tankers and container ships, the new Wärtsilä 31 engine isn't nearly as huge as the mammoth RTA96-C. It stands a more modest 15.4 ft (4.7 m) tall in its highest configurations, and 28.8 ft (8.7 m) long in its longest. The cylinder bore is 12.2 inches (31 cm), and the stroke is 16.9 in (43 cm). In its largest V16 format, it makes up to 13,142 horsepower.</p> <p><div class="inline-item"> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/pictures#1" target="_blank"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/inline/wartsila-31-worlds-most-efficient-diesel-engine-1.jpg" alt=""> </a> </div> </p> <p>It comes in three versions – diesel, spark-ignited gas and dual fuel – and the diesel version takes advantage of advanced fuel and air injection systems, as well as variable valve timing, to deliver a world record efficiency of just 0.271 pounds per horsepower hour.</p> <p>To put that in context, the gigantic RTA96-C was the most efficient engine in the world upon its debut, and it uses 0.278 lb/horsepower hour. That's a saving of about 2.6 percent, and while that might not sound like a lot, these things can burn an enormous amount of fuel in a day. </p> <p>If you were to run the most powerful version of the 31 flat out at maximum power for a whole day, and assume it made the same efficiency figure (it wouldn't, but go with me here), the engine would burn some 85,557 pounds of diesel in 24 hours. So a 2.6 percent saving is going to add up to a heck of a lot of diesel over the service life of the engine.</p> <p>It's also worth noting that there's no efficiency penalty if you fit Wärtsilä's Nitrous Oxide reduction system to the engine to keep emissions down, which is a requirement for operating in certain areas. And the 31 also saves operators money in maintenance, running some 8,000 hours before it needs its first service.</p> <p>Next time we're in Finland, we'll have to drop by. The team at Wärtsilä must deal with some incredible engineering challenges to build these impressive machines. </p> <p>Source: <a href="https://web.archive.org/web/20150627082639/http://www.wartsila.com/media/news/02-06-2015-wartsila-launches-the-new-wartsila-31-engine-a-breakthrough-in-efficiency" target="_blank">Wärtsilä</a> </p> </div>  <div class="page-section"> <ul class="list-ui list-ui--horizontal share-bar"> <li> <div class="fb-like" data-href="http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/" data-send="false" data-layout="box_count" data-show-faces="false" data-share="true"></div> <script type="text/javascript"> _ga.trackFacebook(); </script> </li> <li> <a href="https://web.archive.org/web/20150627082639/http://twitter.com/share" class="twitter-share-button" data-count="vertical" data-via="gizmag" data-url="https://web.archive.org/web/20150627082639/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/">Tweet</a> </li> <li> <div class="g-plusone" data-size="tall" data-href="http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/"></div> </li> <li> <iframe style="overflow: hidden; margin: 0px; padding: 0px; border: 0px;" src="https://web.archive.org/web/20150627082639if_/http://badge.stumbleupon.com/badge/embed/5/?url=http%3A//www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/" width="50" height="60" id="iframe-stmblpn-widget-1" name="iframe-stmblpn-widget-1"></iframe> </li> <li> <div class="pin-it-button" data-url="https://web.archive.org/web/20150627082639oe_/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/" data-image="http://images.gizmag.com/gallery_lrg/wartsila-31-worlds-most-efficient-diesel-engine.jpg" data-description="Already holding the Guinness Book of Records nod for the world's largest engine, Finnish engine manufacturer Wärtsilä has just claimed another record with the world's most efficient 4-stroke diesel engine. "></div> </li> <li> <script type="IN/Share" data-counter="top"></script> </li> <li class="js-share-reddit"> <script type="text/javascript"> reddit_newwindow='1' </script> </li> </ul> </div> <div class="ad "> <div class="ad-label">Advertisement</div> <script async src="//web.archive.org/web/20150627082639js_/http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle ad-article-bottom" style="" data-ad-client="ca-pub-1607124478120364" data-ad-slot="6055296962"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div>  <div class="page-section"> <div class="OUTBRAIN" data-src="https://web.archive.org/web/20150627082639oe_/http://www.gizmag.com/wartsila-31-worlds-most-efficient-4-stroke-diesel-engine/38120/" data-widget-id="AR_1" data-ob-template="Gizmag"></div> <script type="text/javascript" async="async" src="https://web.archive.org/web/20150627082639js_/http://widgets.outbrain.com/outbrain.js"></script> </div>  <div class="page-section media"> <p class="h2 title-standout">About the Author</p> <a class="media__right" href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/author/loz-blain/"> <img src="https://web.archive.org/web/20150627082639im_/http://images.gizmag.com/CACHE/images/avatars/26.8883c4c3501b.jpg" alt="Loz Blain"/> </a> <p>Loz has been one of Gizmag's most versatile contributors since 2007. Joining the team as a motorcycle specialist, he has since covered everything from medical and military technology to aeronautics, music gear and historical artefacts. Since 2010 he's branched out into photography, video and audio production, and he remains the only Gizmag contributor willing to put his name to a sex toy review. A singer by night, he's often on the road with his a cappella band Suade.</p> <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/author/loz-blain/"> All articles by Loz Blain </a> </div>  <div class="page-section"> <p class="h2 title-standout">Tags</span> <ul class="list-ui list-ui--horizontal article-tags"> <li>» <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/tag/engine/" rel="tag">Engine</a></li> <li>» <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/tag/marine/" rel="tag">Marine</a></li> <li>» <a href="https://web.archive.org/web/20150627082639/http://www.gizmag.com/tag/efficiency/" rel="tag">Efficiency</a></li> </ul> </div>  <div class="page-section"> <p class="h2 title-standout">7 Comments</p> <ul class="list-ui list-ui--vertical word-wrap"> <li> <p>Interesting SFC figure, however, the same was obtained by Mike Hewland in a single cylinder, 500cc, single sleeve-valve distribution, Burt-McCollum type, gasoline engine, as in the interview in the C&D July 1974 issue.</p> <p>Best results ever with SSV were with a two stroke, compression ignition engine, with the 'open sleeve' concept, no 'junk head', sleeve acting as an annular piston 10% of piston area, 3% of power output via sleeve drive mechanism and crankshaft.</p> <p>A YT video exists about a Petter Brotherhood SSV in the Wärtsilä line of sizes, in the Anson Engine museum, UK. + salut</p> <span class="strong">Jose Gros</span> </li> <li> <p>Sure wish they could scale that level of efficiency down to consumer size.</p> <span class="strong">Frank Lee</span> </li> <li> <p>Now if we could somehow get this in a motorbike...</p> <span class="strong">Scion</span> </li> <li> <p>750RPM. </p> <p>But the stat I like is the weight. 56 tons for the smallest and 85 tons for the biggest. </p> <span class="strong">fastoy</span> </li> <li> <p>Finland seems to have a penchant for fine engineering.</p> <p>The fellow who was assigned the task to redesign the Rolls Royce Merlin to American Standards and methods at Packard was a Finn having studied at their fine Engineering School.</p> <p>The Packard became the preferred choice to the dismay of the Brits.</p> <p>bill</p> <span class="strong">Island Architect</span> </li> <li> <p>these guys need to ghost in a human for scale</p> <span class="strong">Milton</span> </li> <li> <p>Impressive but what is the RPM range</p> <span class="strong">equator180</span> </li> </ul> </div>  <div class="page-section"> <a name="comment-form"></a> <p class="h2 title-standout">Post a Comment</p> <div data-article="38120"> <form class="login-form js-login-form" action="https://web.archive.org/web/20150627082639/http://www.gizmag.com/login/" method="post"> <p class="strong">Login with your Gizmag account:</p> <p class="js-login-error"></p> <input type="hidden" name="csrfmiddlewaretoken" value="ma10Ts3RDPh6Pscqz5vTLQ7bk1PmtGcD"/> <input type="hidden" name="next" 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Wärtsilä's new 31 becomes the most efficient 4-stroke diesel engine in the world