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.
Key Features
Key Features of 6LPA-STP2:
- Compact profile
- Easy access to maintenance points
- 24 valve overhead cam 6 cylinder in-line four stroke 4.1 liter
- 899 lbs per engine
- Gear reduction starter
- Two-stage fuel injectors
- 80 amp alternator
- Cast stainless mixing elbow for longer life
- Wet turbo
- Multiple transmissions available
**Contact Bertram Yachts for complete model information**
Specifications
Bertram 31 (1981) - Yanmar Repower (Not Prod) Specifications
| Length Overall |
30' 7'' |
Dry Weight |
9, 400 lbs. (with fuel)
|
| Beam |
11' 2''
|
Tested Weight |
N/A
|
| Draft |
2' 7''
|
Fuel Cap |
220 gal.
|
| Deadrise/Transom |
N/A
|
Water Cap |
18 gal.
|
| Max Headroom |
6' 2''
|
Bridge Clearance |
8' 0''
|
| Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model. |
Engine Options
Bertram 31 (1981) - Yanmar Repower (Not Prod) Photo Gallery
|
|
|
A running shot of the repowered Bertram 31.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bertram 31 (1981) - Yanmar Repower (Not Prod) Test Result Highlights
- Top speed for the Bertram 31 (1981) - Yanmar Repower (Not Prod) is 37.4 mph (60.2 kph), burning 29.4 gallons per hour (gph) or 111.28 liters per hour (lph).
- Best cruise for the Bertram 31 (1981) - Yanmar Repower (Not Prod) is 20.1 mph (32.3 kph), and the boat gets 2.01 miles per gallon (mpg) or 0.85 kilometers per liter (kpl), giving the boat a cruising range of 397 miles (638.91 kilometers).
- Tested power is 2 x 315-hp Yanmar 6LPA-STP2 Diesel.
For complete test results including fuel consumption, range and sound levels
go to our
Test Results section.
Standard and Optional Equipment
Bertram 31 (1981) - Yanmar Repower (Not Prod) Standard and Optional Equipment
= Standard 
= Optional
Bertram 31 (1981) - Yanmar Repower (Not Prod) Warranty
Bertram 31 (1981) - Yanmar Repower (Not Prod) Warranty Information
| Warranties change from time to time. While BoatTEST.com has tried to ensure the most up-to-date warranty offered by each builder, it does not guarantee the accuracies of the information presented below. Please check with the boat builder or your local dealer before you buy any boat. |
Full Warranty Information on this brand coming soon!
Bertram 31 (1981) - Yanmar Repower (Not Prod) Price
Bertram 31 (1981) - Yanmar Repower (Not Prod) Price
| Base Price (MSRP) |
N/A
|
| Price as Tested
|
N/A
|
| Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model. |
Yanmar Repower: Bertram 46 Battlewagon
Bertram Innovation: Anti-Rolling Gyro (ARG)
Bertram 20 Moppie Repowered with Yanmar Diesel
Bertram 25 Moppie Repower (Yanmar)
Bertram 31 Repower (Yanmar)
Innovations and Differences in the Motor Mounts (Bertram)
Innovator in Centerline Fiberglass Fuel Tank (Bertram)
Innovator in the Backing Station (Bertram)
Innovator in the Spiral Staircase (Bertram)
Pop-Up Helm Console (Bertram)
Repowering with Gas or Diesel? (Yanmar)