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Vibration under acceleration |
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dutchus 
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Joined: March-25-2024 Location: Western Michian Status: Offline Points: 2 |
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 Topic: Vibration under accelerationPosted: August-29-2024 at 12:59pm |
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I have a 1968 Correctcraft Mustang with 318 225HP.
When accelerating, it vibrates bad but cruise around 30 MPH and under, smooth. 12" X 12" prop redone, new strut bearing, aligned strut and shaft alignment, and engine runs great. Only thing I can think of is mounts. Any other ideas and where to obtain the mounts? Thank you |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 3032 |
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Posted: August-29-2024 at 7:59pm |
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My money is on the prop. You say it’s “redone”. Care to elaborate? A new CNC prop is velvet smooth….
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3778 |
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Posted: August-29-2024 at 8:43pm |
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Any chance you checked the prop shaft to see if it is straight. There is an allowed run out number to avoid vibration. I forget what is allowable. .003 maybe?
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3372 |
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Posted: August-30-2024 at 8:04am |
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Also, don't dismiss a cold jug or two wires crossed. an 8 will chug on acceleration, then smooth out at cruise
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
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