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Thread: DD 8v71s and 8v92s info
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Re: DD 8v71s and 8v92s info
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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01-15-2018 07:31 PM #12Registered Member
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- Dec 2017
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Re: DD 8v71s and 8v92s info
John, I had 8v71n's in my '71 45' Convertible. You understand the issues. Mine leaked oil like a sieve and the mechanical noise from the injectors was very loud. Normal conversation in the salon wasn't possible. The salon being right over the engines didnt help. On the plus side, the engines didn't smoke after startup, got good fuel economy at displacement speeds and parts availability was good . In terms of rugged reliability, aspirated 2-cycle Detroits are the the equal of any modern diesel. I love the exhaust note.
I have since repowered with Cummins 6bts 210 hp. I run the boat at displacement speeds so i didn't need big iron. The duty cycle for the boat is to take us from Bellingham to Alaska in the spring, fish all summer and return in September. The boat is perfect for this application, with new power and genset, 2 freezers and plenty of redundant systems. A Hatteras really turns heads in the remote areas of Alaska.
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01-15-2018 09:07 PM #14Senior Member
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- Apr 2005
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Re: DD 8v71s and 8v92s info
I have 6-92's in my 1982 Series I 48' MY and they are very quiet.....unless you go down into the
engine room. Years ago shortly after I bought the boat, I replaced all the sound proofing in the ER with
Soundown and it really made a big difference. My boat has two very large mufflers on each engine as
well and all we hear on the flying bridge is a low steady hum. I doubt that Hatteras' are any louder
than any thing else and in fact they are probably easier on the ears.
Walt
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01-16-2018 08:10 AM #15Registered Member
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- Jan 2018
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01-16-2018 08:13 AM #16Registered Member
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- Jan 2018
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Re: DD 8v71s and 8v92s info
I appreciate all of the replies. Late yesterday, I spoke with a broker who has a 61' MY with 892s for sale. He said it has 3600 hours on the engines, no leaks, and no smoke other than the normal diesel start up. He invited me to come over and start the engines myself. He also echoed many of the things you guys said. Thanks again.
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Re: DD 8v71s and 8v92s info
Noise levels vary with each boat and there are two types of noise. Exhaust and inside mechanical
The exhaust of some boats are quieter than others For instance the 58 MY with 8V92s is much louder on the FB than the 53 or 58 YF with 71s. It s a nice sound but gets a bit tiring after a while
At the lower helm most boats are quiet especially at hull speed. If any mechanical noise makes it thru it's usually because of bad seals on the ER doors or around the engine hatches. It can also come thru some of the wire chases from ER to helm and saloon. All which can be easily addressedPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: DD 8v71s and 8v92s info
We had 892 TI's in the 56 Hatteras MY and it was extremely quiet in the main salon and lower helm. I have run 2 56 Hatts differing in years (1981 and 1984) easily 10,000+ miles combined. In the 56 even the exhaust note is pretty quiet confined to a low rumble.
Inside the engine room is another story with a mechanical note that I grew to absolutely love.Nightingale - 1984 Hatteras 56 Motor Yacht
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01-16-2018 12:16 PM #20Senior Member
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