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Newsletter Sign Up var videoData = {"video_carousel_display":"inline","video_carousel":{"dealer_info":false,"items":[{"title":"Bertram 31 (1981) - Yanmar Repower (Not Prod) - Test Video","image":{"src":"\/sites\/default\/files\/media-icons\/generic\/video.png","alt":""},"url":"https:\/\/player.vimeo.com\/video\/251698354"}]}}; - [Price Quote](/user/login?destination=/markdownify/node/81398) - [Schedule a Test Drive](/user/login?destination=/markdownify/node/81398) - [Connect](/user/login?destination=/markdownify/node/81398) - [Compare to other boats](/boats/compare/81398) [Request More Boat Information](/request-more-boat-information-boat-test) --- [ ![Boat History Report Banner Ad](/sites/default/files/images/2020-09/boathistoryreportbanner.jpg) ](https://boathistoryreport.com/?utm_source=BoatTEST&utm_medium=testsNew&utm_campaign=affiliate) ## Brief Summary Just sprucing up the interior, updating the electronics and maybe adding a new paint job isn’t enough when you are trying to take a classic like the 31 Bertram and breathe new life into her. Richard Mastry of Mastry Engine Center in St. Petersburg, Florida recently took us on a ride down memory lane with one of his passions-- repowering beautiful old Bertrams. He has repowered over 30 of them, so we would call him a pro and since he helped bring Yanmar marine engines into the US, he could also be considered a professional resource for repowering a boat with Yanmar engines. This particular model has been repowered with twin Yanmar 6LPA-STP2s. ## Test Results | RPM | MPH | Knots | GPH | MPG | NMPG | SM | NM | dBa | |---|---|---|---|---|---|---|---|---| | 1250 | 8.5 | 7.3 | 2.7 | 3.13 | 272 | 620 | 539 | 83 | | 1500 | 9.2 | 8 | 4.3 | 2.13 | 1.85 | 421 | 366 | 84 | | 1750 | 10.1 | 8.8 | 6.2 | 1.63 | 1.42 | 323 | 280 | 85 | | 2000 | 15.9 | 13.8 | 7.9 | 2.01 | 1.74 | 397 | 345 | 85 | | 2250 | 20.1 | 17.4 | 10 | 2.01 | 1.74 | 397 | 345 | 86 | | 2500 | 23.7 | 20.6 | 12.4 | 1.91 | 1.66 | 378 | 329 | 87 | | 2750 | 26.4 | 23 | 14.4 | 1.83 | 1.59 | 363 | 316 | 88 | | 3000 | 29.5 | 25.6 | 16.7 | 1.76 | 1.53 | 349 | 304 | 90 | | 3250 | 31.3 | 27.2 | 19.1 | 1.64 | 1.42 | 324 | 282 | 89 | | 3500 | 34 | 29.6 | 23.3 | 1.46 | 1.27 | 289 | 251 | 90 | | 3750 | 35.9 | 31.2 | 26.8 | 1.34 | 1.16 | 265 | 231 | 90 | | 3911 | 37.4 | 32.5 | 29.4 | 1.27 | 1.11 | 252 | 219 | 91 | [View the test results in metric units](#) ![bertram31-chart.jpg](/sites/default/files/images/boat-charts/bertram31-chart.jpg) ## Specifications | Length Overall | 30' 7'' | |---|---| | Beam | 11' 2'' | | Dry Weight | 9, 400 lbs. (with fuel) | | Draft | 2' 7'' | | Deadrise/Transom | N/A | | Max Headroom | 6' 2'' | | Bridge Clearance | 8' 0'' | | Fuel Capacity | 220 gal. | | Water Capacity | 18 gal. | ## Acceleration Times & Conditions | Time to Plane | 5.3 sec. | |---|---| | 0 to 30 | 8.4 sec. | | Ratio | 2:1 | | Props | Michigan 18 x 25 4 blade broze | | Load | 3 pers., Fuel 107 gal., Water 12 gal , min. gear | | Climate | Temp: 90 deg., humid: 47%, wind: 5 mph, 10 mph: min chop | ## Engine Options | Tested Engine | 2 x 315-hp Yanmar 6LPA-STP2 Diesel | |---|---| | Std. Power | Not Available | | Opt. Power | 2 x 315-hp Yanmar 6LPA-STP2 | ## ezstandalone.cmd.push(function() { ezstandalone.showAds(103); });\*\*Contact Bertram Yachts for complete model information\*\* ezstandalone.cmd.push(function() { ezstandalone.showAds(104); }); - [Price Quote](/user/login?destination=/markdownify/node/81398) - [Schedule a Test Drive](/user/login?destination=/markdownify/node/81398) - [Connect](/user/login?destination=/markdownify/node/81398) - [Compare to other boats](/boats/compare/81398) Bertram Express Fishboats,