Folks:
Is anyone running now or in the past Hatts with 8V-92 engines? I am looking at a late 80s Hatt that has these and have heard via Yacht Club and boatyard grapevine mixed reviews of these engines.
I am looking at a MY not a sportfish and thus the engines are not that juiced up (still rated at 720 hp each). I would appreciate feedback on these engines and any stats on fuel burn if you have them.
Thanks in advance.
Spin
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06-12-2012 11:54 PM #1Senior Member
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- Mar 2006
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Experience with 8V-92 Detroit diesels
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Re: Experience with 8V-92 Detroit diesels
I have 8 92's and have been running them for the last 13 years or so. I like the engines but mine are only rated at 650 hp. 720 is getting up there for these engines. I needed to major both of mine at about 2,000 hours which I understand is fairly common. My fuel burn is 50 gph at 175 off of the pins and 25 gph at 1500 rpms. This information is from a 56 MY.
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06-13-2012 09:47 PM #3Senior Member
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- Mar 2006
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Re: Experience with 8V-92 Detroit diesels
Dear JLR
Thank you for feedback. What type of speed are you achieving at those two RPM settings.
Thanks
Spin
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Re: Experience with 8V-92 Detroit diesels
Biggest issue with the 8v92s is the turbos -- the design is weak in the housing section and you need to make sure the exhaust is properly-supported so it doesn't load the turbo housings. If you don't the exhaust-side seals will get broken and then you get soot ingestion into the engines, which is extremely damaging in a big hurry.
Other than that the usual "gotcha" for high-horsepower Detroits is overheating. Diesels in general are VERY intolerant of overheats and marine DD turbo engines are marginal in their cooling capacity. If you're in a year-round boating area (no-freeze conditions) consider running distilled water + DD-approved inhibitors instead of coolant as that will give you 7-10% more heat transport capacity, which is a big improvement. This is a DD-approved option; it's not "back yard mechanic" stuff. Keep the coolers clean. Do not let the engines go over 185F -- period -- if you start to see temperature creep problems find out what's going on and FIX IT IMMEDIATELY.
And as with all engines, make sure you're not overloaded (that you can turn up 2350 at WOT, etc.)
I like DDs in general but the 8vs at 720HP are pretty high-strung and as such very intolerant of anything being out of sorts.http://www.denninger.net - Home page with blog links and more
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06-14-2012 12:15 AM #5Senior Member
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- Mar 2006
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Re: Experience with 8V-92 Detroit diesels
Genesis
Thanks for the feedback. My inclination is to find a good boat (and despite all logic) re-power. I have already spoken to a friend who is a CAT dealer (who by the way says from a cost sense not to repower) and have a general number for going with C 15 Acert engines.
The end result if handled by a top yard should be very good.. expensive but much less than buying a new boat.
Spin
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Re: Experience with 8V-92 Detroit diesels
At those rpms, I cruise at 15.5-16 kts and at 1500 rpms I am doing about 10 kts.