Hi I am new to the board. I have a 1999 Sea Ray 270 with the 7.4 MFI V8. For some reason the boat feels underpowered. It struggles to come up onto plane with more than 4 people on board and that is with drive all the way down and tabs deployed. The owners manual states that with WOT it should run between 4200 - 4600 RPMs. I dont go past 3600. Any idead what to check. Thanks !! Jim
Hello and question
- Thread starter Jmazzio
- Start date
Welcome. Here is a list of things to check. Most will apply to your boat.
Engine Won't Reach Operating RPM (WOT). Check....
1. Fuel condition. Type and Octane possibly old fuel
2. Propeller pitch or diameter, damaged blades
3. Restricted fuel pickup tube or anti siphon valve http://forums.iboats.com/showthread.php?t=283363
4. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
5. Marine growth on hull and outdrive
6. Wrong gear ratio in outdrive
7. Restricted carburetor air intake (clogged flame arrestor)
8. Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
9. Poor cylinder compression
10. Carburetor defective, or wrong type.
11. Fuel pump pressure and vacuum
12. Boat overloaded, improperly loaded, or improperly trimmed.
13. Engine Overheating
14. Engine timing and ignition system operation
15. Remote control cables and linkage for proper travel to open throttle plates fully.
Engine Won't Reach Operating RPM (WOT). Check....
1. Fuel condition. Type and Octane possibly old fuel
2. Propeller pitch or diameter, damaged blades
3. Restricted fuel pickup tube or anti siphon valve http://forums.iboats.com/showthread.php?t=283363
4. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
5. Marine growth on hull and outdrive
6. Wrong gear ratio in outdrive
7. Restricted carburetor air intake (clogged flame arrestor)
8. Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
9. Poor cylinder compression
10. Carburetor defective, or wrong type.
11. Fuel pump pressure and vacuum
12. Boat overloaded, improperly loaded, or improperly trimmed.
13. Engine Overheating
14. Engine timing and ignition system operation
15. Remote control cables and linkage for proper travel to open throttle plates fully.
