Not able to hit WOT RPMs with Mercruiser 5.0L

mjswan8029

New Member
May 13, 2013
10
United States
Boat Info
1994 230 Sundancer
Engines
Mercruiser 5.0L
I have a 1994 Sea Ray 230 with a Mercruiser 5.0L. Recently, I changed the engine / outdrive oil and since that time I have noticed I cannot reach WOT throttle RPMs (4400-4600). I'm only hitting 4200 at best and the boat seems sluggish to plane. I did notice it with 5 people aboard, which I had never had that many people on the boat before.

I'm curious could the drop in RPMs / sluggish performance out of the hole be attributed to the extra weight? Could I have put too much engine oil in the engine thus causing some performance issues? I have checked the dip stick and it looked a little high but I wasn't sure given the boat not sitting level on the trailer.

The oil pressure seemed a little low at higher RPMs compared to before the oil change (~50 vs the 60 before the oil change).

Prop has not changed and no damage has occurred in the timeframe.

Any thoughts would be awesome! I'm new to this engine.

Thank you!
 
Assuming the bottom is clean

1. Check the dipstick. Too much oil is a recipe for other disasters.
2. Run the boat with just you and see what you get.
3. Carb or EFI?h
4. When was the last time it was tuned up soup to nuts? To include wires.
4. How old is the gas?
 

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