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Author Topic:   Engine Mounting Height
rtk posted 04-19-2004 08:10 PM ET (US)   Profile for rtk   Send Email to rtk  
As I have stated in a previous topic I have repowered my 1997 21 Outrage with a new 2003 250 HP EFI Mercury. I just purchased the boat last October and it felt like I was not getting much "bite" while underway- always felt like I was getting some ventilation or cavitation. Very little room to trim the motor up before it cavitated. I first suspected the prop- so for the repower I'd play with a few propellers. Dealer recommended a four blade so I figured I would give it a go. I have had the boat out a few times and I am still experiencing the same cavitation or ventilation I had with the other motor and prop when it is choppy. Calm water really not a problem- seems to dig right in and the boat handles like a dream. The boat will plane off around 3200-3500 rpm and get up to 4200 rpm or so. A minute or so after that the rpms will just drop about 300 or so and it really feels like the prop is "biting" real well. At the 4200 rpm or so before this happens it feels a little loose.

Seems to me that the engine height is a little high? I really didn't pay close attention to how much higher the anti-ventilation plate is above the keel before they launched it.

What engine height is everyone else running? Any assistance or recommendations appreciated.

Oh, what a motor that 250hp EFI is. The throttle response is incredible- a real nice running motor.


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