Jimmy Buoy
Well-Known Member
- Dec 3, 2008
- 2,469
- Boat Info
- 2003 Cobalt 293
- Engines
- Twin Volvo-Penta 5.0 270hp & DuoProps
I had the same boat but a 2001 340 Amberjack (some minor differences in the cabin, but the same basic boat. It was powered by 8.1's which compared to older 7.4's had a much better cruising speed/rpm combo. You might want to take a good look at the 6.2 torque curve info to see how much torque it supplies at 3000-3600rpm.
That's the normal cruising rpm for that boat. My Amberjack would run at the following...
2400 rpm 11.5 mph full tabs
2800 rpm 16 mph full tabs
3300 rpm 26 mph no tabs
4500 rpm 38.5 mph no tabs
If the 6.2's don't provide near the same torque, you will have to run at higher rpm's with less aggressive props to achieve the same type of performance.
That's the normal cruising rpm for that boat. My Amberjack would run at the following...
2400 rpm 11.5 mph full tabs
2800 rpm 16 mph full tabs
3300 rpm 26 mph no tabs
4500 rpm 38.5 mph no tabs
If the 6.2's don't provide near the same torque, you will have to run at higher rpm's with less aggressive props to achieve the same type of performance.