1978 Bertram 31 Boat in Winthrop Harbor, IL 60096 US
Built in 1978
31
2 Engines (2x MERCRUISER)
31 feet
Gas
Fiberglass/Reinforced
Price History
| Date | Event | Price |
|---|---|---|
| 5/20/26 | Initial price | $119,900 |
1978 Bertram 31 Video Tours
Boattest.com Review
Overview
This review examines the impact of repowering a 1981 Bertram yacht with modern Yanmar 6LP series diesel engines. Originally equipped with two 330 horsepower Mercruiser 454 gasoline engines, the vessel underwent an upgrade to twin Yanmar 6LPA STP II diesel engines. This transition not only improved efficiency and operational security but also added value by reducing weight and fuel consumption while freeing up valuable engine room space.
Engine Design and Installation
The Yanmar 6LPA STP diesel engine features a compact design that fits easily within the existing engine stringers of the Bertram, creating an additional 3 inches of space on the inboard side and sufficient room on the outboard side to accommodate a small generator. The aft end of the engine also gained 5 inches of clearance. Despite its compact profile, the engine maintains accessibility to key maintenance points, including oil dipsticks on both sides, a spin-on oil filter, a secondary fuel water separator filter, and a primer pump located on the inboard side. The heat exchanger is positioned high on top with hoses routed around the front, while the stainless steel mixing elbow, wet turbocharger, compressor, and air intake are arranged efficiently at the aft end. The transmission cooler and hoses are located below these components. This layout significantly improves space utilization compared to the original large-block gasoline engines, allowing easier access to batteries and additional equipment placement.
Engine Specifications and Performance
The 6LPA STP is a 6-cylinder, 4-stroke, 4.1-liter turbocharged diesel engine equipped with an intercooler and a fresh water cooling system, which is considered optimal for marine applications. It delivers a continuous rating of 255 horsepower at 3600 RPM and a maximum output of 315 horsepower at 3800 RPM, weighing 899 pounds. The repowered Bertram achieved planing in 5.3 seconds and reached 30 mph in 8.4 seconds. At maximum RPM (3911), the engines consumed 29.4 gallons per hour, providing a range of 254 miles at 37.4 mph. Operating closer to the continuous rating at 3500 RPM, fuel consumption dropped to 23.3 gallons per hour, extending the range to 292 miles at 34 mph. The most economical cruise speed was 20.1 mph at 2250 RPM, yielding a range of 401 miles. These figures highlight the improved fuel efficiency and extended cruising capabilities afforded by the diesel repower.
Operational Benefits and Owner Experience
The repower delivered significant benefits including reduced engine weight, increased available space, and easier maintenance access, all contributing to safer and more economical operation. The owner noted that the only unexpected cost was repainting the waterline due to an overall weight reduction of approximately 3,000 pounds from the new engine installation. The diesel engines provide peace of mind through reliable and efficient performance, promising many years of enjoyable boating. The reviewer also emphasizes the advanced engineering of Yanmar's latest diesel models and recommends considering Yanmar power for both repowers and new yacht specifications.
Overview from around the web 1978 Bertram 31
The 1978 Bertram 31 continues to receive positive feedback from customers who appreciate its classic design and exceptional performance on the water
Here are some common sentiments shared by owners and enthusiasts: 1. Reliability and Build Quality: Many owners commend the Bertram 31 for its robust construction and seaworthiness. The solid fiberglass hull and quality materials used in its build provide a sense of security, making it a favorite for both casual cruising and serious fishing. 2. Performance: Customers often mention the boat's impressive handling and maneuverability, especially in rough waters. Its deep-V hull design allows for smooth rides even in challenging conditions, making it a dependable choice for offshore trips. 3. Spacious Layout: The interior layout is frequently praised for its thoughtful design, maximizing space for both comfort and functionality. Owners appreciate the ample storage, galley facilities, and the well-designed cockpit that caters to fishing enthusiasts. 4. Classic Aesthetics: The timeless style of the Bertram 31 is a highlight for many. The classic lines and distinguished profile resonate with those who value vintage craftsmanship, and many find it turns heads at the docks. 5. Excellent Fishing Platform: For anglers, the Bertram 31 is regarded as a top-tier fishing platform, providing a stable and spacious cockpit that can accommodate multiple users. Its deep gunwales provide safety and comfort while reeling in the catch. Overall, the 1978 Bertram 31 is affectionately regarded as a classic that stands the test of time, appealing to a diverse group of boaters for its reliability, performance, and stunning design.
The Biggest Pros and Cons
1978 Bertram 31: Pros and Cons
Pros
Classic Design: The Bertram 31 is renowned for its timeless aesthetic, featuring a classic deep-V hull design that is both attractive and functional.
Performance: Known for its seaworthiness, the deep-V hull allows for a smooth ride in rough waters, making it a favorite among serious anglers and leisure boaters alike.
Versatility: The Bertram 31 can easily serve multiple purposes - from fishing to cruising or entertaining, making it an adaptable choice for various boating lifestyles.
Spaciousness: Despite its compact size, the cabin layout provides a surprisingly spacious interior with adequate headroom, making it comfortable for overnight trips.
Robust Build Quality: Constructed with durable materials, these boats are known for their longevity and ability to withstand the rigors of both saltwater and freshwater environments.
Strong Community: With a loyal following, owners often find access to a network of fellow enthusiasts, resources for maintenance, and a market for parts and upgrades.
Cons
Fuel Efficiency: While the performance is impressive, older models like the 1978 Bertram 31 can be less fuel-efficient compared to modern boats with advanced engines and designs.
Maintenance Requirements: Older boats may require more frequent maintenance and repairs due to their age, which can lead to added costs and time commitment for owners.
Limited Modern Amenities: While the layout is functional, the interior may lack the modern conveniences and technology found in newer boats, which some buyers might find less appealing.
Weight: The solid construction that provides durability also contributes to a heavier vessel, which may affect towing and maneuverability for some owners.
Space Constraints: While the interior is spacious for a boat of its size, it may still feel cramped for larger groups, especially during extended outings or overnight stays.
Made For
The 1978 Bertram 31 is a classic and versatile boat designed to appeal to a wide range of boating enthusiasts. Ideal for passionate anglers, this vessel features a deep-V hull that provides excellent stability and performance, making it a top choice for both offshore and inshore fishing excursions. Families looking for a reliable platform for weekend getaways will appreciate the spacious cockpit and comfortable cabin, which can accommodate overnight stays. The layout is practical, with ample storage and seating, making it suitable for entertaining guests or enjoying quality time on the water. Whether you are an experienced boater or a novice looking to explore, the Bertram 31's timeless design and robust construction ensure a safe and enjoyable experience. Its strong reputation for durability and seaworthiness makes it an attractive option for those who value reliability and performance in their marine adventures.
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Boats For Sale in Illinois, United States Similar to the 1978 Bertram 31
Compare with similar boats and find the perfect one for you.
 1978 Bertram 31 | |||||
|---|---|---|---|---|---|
| $119,900 | $119,900 | $74,690 | $72,999 | $69,995 | $62,000 |
| Winthrop Harbor | Winthrop Harbor | Round Lake | Mchenry | Round Lake | Grafton |
| 31' | 31' | 23' | 25' | 23' | 47' |
| MERCRUISER | MERCRUISER | MERCURY | - | Yamaha | Crusader |
| 310 hp | 310 hp | 200 hp | - | 200 hp | - |
| 40 | 26 | 450 | 42 | 50 | 18 |
Other 1978 Bertram 31 For Sale in Illinois, United States
Meet the Broker
Address
Boat Location
Contact Skipper Bud's North Point about 1978 Bertram 31
215 North Point Drive, Winthrop Harbor, IL, 60096
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