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Old 22 August 2005, 05:22   #1
Country: Sweden
Town: Stockholm
Make: Bombard DB500
Length: 5m +
Engine: Evinrude e-tec 50
Join Date: Mar 2005
Posts: 5
Engine mounted to high on transom?

I have a Bombard DB500 + Evinrude e-tec 50.
The engine are raised about two inch on transom.

Is it possible that a raised engine pulls the rear of the tubes into the water?
When running at speeds above 25knots the water sprays heavaly from the rear of the tubes and on the engine.
Would it work better if engine are lowered back to default?


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Old 22 August 2005, 15:28   #2
Richard B's Avatar
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
Hi Christian,

I'm no expert on engine heights, but I understand that you should be mounting the engine so that the anti-cavitation plate (it may have a different name in Sweden) is approximately level with the keel (ie the v) of the hull, or a little bit higher. Beware that if you adjust the height of the engine, then it may affect the perfomance of the boat. However, if it's causing problems, then possibly try some adjustments.

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Old 23 August 2005, 06:40   #3
Country: Norway
Town: Trondheim
Make: Revenger 34
Length: 10m +
Engine: yamaha F350
Join Date: Jan 2003
Posts: 12

I have an Bombard DB730, this boat also have this spray of water on the engine. I have mountet the engine with anti cavitation playe 1 inch above the keel.
The reason for this spray is the way the tubes are atached to the boat, so u need to freqvently spray the engine with motor conservation spray on the powerhead in order to protect the engine against the corroding effect.

But try to raise the engine to abaout 1 inch , an use an steel high rake proppeller, like ballistic. then u will gain some speed. The proppeller has to tolerate som air in its blades in order to operate properly.
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