The 2005 Silverton 34 Convertible was offered with both Crusader 6.0L MPI and 8.1L MPI engine options, providing different performance characteristics. The 8.1L engine is generally favored in this hull for better performance and efficiency at lower RPMs.

Engine Specifications

Feature Twin Crusader 6.0L MPITwin Crusader 8.1L MPI Total Horsepower~640-750 hp (320-375 hp each)~760-850 hp (385-425 hp each) Fuel TypeUnleaded GasolineUnleaded Gasoline TypeInboard, Closed Cooling SystemInboard, Closed Cooling System Approx. Fuel Use (Cruise)~25 GPH (at cruise speed on plane)~29 GPH (at cruise speed on plane) Approx. Max Speed~25-31 mph (21-27 knots)~31+ mph (27+ knots)

Performance and Efficiency Notes

• Torque: The 8.1L engine provides significantly more low-end torque compared to the 6.0L. This allows the heavier Silverton 34 Convertible hull to get on plane more easily and cruise at a lower, more efficient RPM.
• Cruising: Running the 34 Convertible on plane at an efficient cruise speed often requires high RPMs with the 6.0L engines, leading to high fuel consumption for the speed achieved. The 8.1L setup is generally considered better for achieving efficient planing speeds.
• Hull Speed: At hull speed (around 7-10 knots), fuel consumption for both engines is considerably lower, with some owners reporting around 1-1.5 nautical miles per gallon total.
• Maintenance: Both engines use a closed cooling system suitable for saltwater use, which helps with longevity.

The choice between the two engines often comes down to desired performance. For better overall performance, especially when loaded or at higher speeds, the 8.1L is the generally recommended option. You can find more detailed performance data and owner insights