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Beta Marine Repower Solutions -> Beta Marine Engines -> RPM beta 25
Post Info TOPIC: RPM beta 25
celappiii


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RPM beta 25
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I have a 2 year old BETA 25 WOC K37021 Engine # 411 G 1351.

I understand the engine should top out at 3600 rpm in neutral and in gear; 3600 rpm in idle is achieved.

In gear only 3300 rpm is achieved; assuming the bottom is clean, could it be the pitch?

It is a 3 blade prop pitch 15" x 8"

Charlie Lapp

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celappiii


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I forgot to add that the boat is a 1990 Catalina 36, wing keel

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Stanley


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Assuming that you can easily reach 3,600 in neutral, then you do have too much propeller. If you cannot easily reach 3,600 in neutral, first adjust the controls so that you can.

If the controls are correctly adjusted, then this could be because your propeller has a larger blade area ratio (BAR or EAR) that 50%.
I suggest that you get a propeller company to take 1" of pitch out of the prop which will help considerably.

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