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I recently purchased a new boat to me. Its a 31′ Bertram FBC. It has 2003 Yanmars 6LYA-STP 365 H.P. Each engine has right at 700 hrs on them. The gears are zf models 220A, ratio is 1.75:1 and she is propped at blade 22 x 24 x 1.75. I was told when lifted at the yard, that she weighs 18k pounds. It also refit by Cabrera Yachts in 2003. They tunneled the hull as well. This boat reminds me of Shooter that Seaboard refit.
The old owner told me that she takes a while to spin up and get on plane. I was told that its a Cabrera thing to build boats for speed. My first trip after having her delivered was as such. I left the marina, and opened her up to WOT to see what she has. Man, she is slow taking off. I didn’t record an accurate time or rpm, but I would say from 1200 to 1800 rpm took about 30 seconds. At about 1800 rpm, I pulled back on the throttles to about half throttle, then slowly opened the throttle as rpm increased. I would say it took me a good 2 1/2 to 3 minutes to get her to wide open. She does fly at WOT, but she’s a slug getting to WOT.
So, there’s a little puff of black smoke, more so out of the port engine than the starboard, but nothing like a diesel truck that someone turned the pump up on, and mosquito fogging everyone. I will try to attach a video if its not to large a file.
All things being fair and equal, There’s no boost or egt gauge. The exhaust out of the turbos are not done right. I don’t know when or if the aftercoolers were serviced, I do not see that in the service records. I am guessing she has 3-4 coats of bottom paint. She is a heavy fat girl, that I’d like to lighten up a bit. I say that because she hits 3,000 rpm at WOT. These are 3300 rpm engines.
I am guessing that she is over propped, does anyone have any suggestions on a good base size prop to start with, or should I be focusing more on engine issues and maintenance first?
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