Re: 20 MPH Slow!
The motor shot comment was tongue in cheek. It seemed you were unwilling to even try cleaning the hull to see how things improved.
Based on your stated symptoms, a missing cylinder sounds extremely unlikely given all else is working correctly. You are true in your assessment that you can hardly tell by sound if a V8 is missing on a cylinder, or even 2. However for it to still be producing to 4800 RPM without the prop half out of the water is not normal unless you propped down like 4 inches.
Something still doesn't seem right, and you would really need to confirm your tach, as that is the most important gauge on your boat when troubleshooting mechanical problems. For instance if you stated it was only getting 3200 RPM you would have had more responses toward missing cylinders, etc.
Glad you figured it out though.
The motor shot comment was tongue in cheek. It seemed you were unwilling to even try cleaning the hull to see how things improved.
Based on your stated symptoms, a missing cylinder sounds extremely unlikely given all else is working correctly. You are true in your assessment that you can hardly tell by sound if a V8 is missing on a cylinder, or even 2. However for it to still be producing to 4800 RPM without the prop half out of the water is not normal unless you propped down like 4 inches.
Something still doesn't seem right, and you would really need to confirm your tach, as that is the most important gauge on your boat when troubleshooting mechanical problems. For instance if you stated it was only getting 3200 RPM you would have had more responses toward missing cylinders, etc.
Glad you figured it out though.
