northern
Well-Known Member
- Jan 17, 2007
- 3,526
- Boat Info
- 380 Aft Cabin 1989 Charts Timezero radar Furuno
- Engines
- Twin 454 strait shaft
Not a SeaRay engine
Have a 2008, 350 Vortex with 180 hours on it in my jetboat. Run it at 3,700 RPM most of the time. Use SAE 30 single weight oil. Manufacture recommends 30 or 40 weight oil.
This summer engine started to use a quart of oil every 10 hours. We ran it 8 to 13 hours a day for two weeks.
Raw water temperature 65F all summer.
Engine is closed cooling system and runs at just under 200F at 3,700 to 4,000 and 160 at 1,400 RPM.
Did dry compression test (Engine had sat for 3 months) all cylinders 150 +/- 5 PSI except two that were 178 and 180.
Did wet compression and pressure up on average 30 PSI.
Spark plugs brown, electrodes not burn. One person comment was looks like engine is running rich. Black deposits on threads near electrodes.
Engine does not use oil at 1,400RPM
No visible sign of engine burning oil on start up or when running, PVC valve not plugged, no oil in PVC hose, no oil in bilge, no oil on exterior of engine.
Questions
Should I go to SAE 40 or other type of oil
Any other test I can do
Is this oil consumption normal when running engine for long time at high RPM.
Have a 2008, 350 Vortex with 180 hours on it in my jetboat. Run it at 3,700 RPM most of the time. Use SAE 30 single weight oil. Manufacture recommends 30 or 40 weight oil.
This summer engine started to use a quart of oil every 10 hours. We ran it 8 to 13 hours a day for two weeks.
Raw water temperature 65F all summer.
Engine is closed cooling system and runs at just under 200F at 3,700 to 4,000 and 160 at 1,400 RPM.
Did dry compression test (Engine had sat for 3 months) all cylinders 150 +/- 5 PSI except two that were 178 and 180.
Did wet compression and pressure up on average 30 PSI.
Spark plugs brown, electrodes not burn. One person comment was looks like engine is running rich. Black deposits on threads near electrodes.
Engine does not use oil at 1,400RPM
No visible sign of engine burning oil on start up or when running, PVC valve not plugged, no oil in PVC hose, no oil in bilge, no oil on exterior of engine.
Questions
Should I go to SAE 40 or other type of oil
Any other test I can do
Is this oil consumption normal when running engine for long time at high RPM.