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1989 SN2001 drive ability issues

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captinr View Drop Down
Groupie
Groupie


Joined: February-01-2006
Location: United States
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    Posted: September-15-2024 at 8:00pm
I need the prop whisperer. Just picked up an 89 2001 CB. My fourth '89. 1300 hours, boat is incredibly clean. I have a vibration at low and mid throttle. Came with a OJ 13x16 P2 4 blade. I just pulled it off. Held on with a lock nut, no cotter pin. It had a little side to side movement, as well as a little front to back. Didn't need a puller to get it off. No apparent damage. Motor runs strong but running that prop, could only get 2000-2200 RPM up to about 32MPH. I also have the 14x16 3 blade that supposedly was the original. Thoughts?
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KENO View Drop Down
Grand Poobah
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Joined: June-06-2004
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: September-16-2024 at 8:17am
Originally posted by captinr captinr wrote:

Motor runs strong but running that prop, could only get 2000-2200 RPM up to about 32MPH. I also have the 14x16 3 blade that supposedly was the original. Thoughts? 
I think your speed vs RPM numbers don't really make any sense at all.

You should have about a 100 to 1 ratio of RPM to speed

For example 3000 rpm would be about 30 mph.

So, your tach and speed readings are more than a little questionable Wink

The 14X16 would have been the original prop on your 89,  with the 1.23 to 1 transmission, so if it's in good shape why not put that on and see how the boat runs?

Then you could click on the link below and read about a couple of Acme props that are a good match to that boat

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