In looking on the used markets, I'm seeing the 12V71Ti's in the 60+ ft. boats.
How are the life spans on these versus the motors on the 53's and 58's? Any difference?
Thanks!
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Thread: 12V71Ti Life versus 8V92Ti ?
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09-22-2020 07:55 AM #1Senior Member
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12V71Ti Life versus 8V92Ti ?
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09-22-2020 08:04 AM #2Senior Member
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Re: 12V71Ti Life versus 8V92Ti ?
SOUTHPAWS
1986 52C Hull #391 8v92TI
PENSACOLA, FL
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09-22-2020 08:24 AM #3
Re: 12V71Ti Life versus 8V92Ti ?
Divide the HP into the displacement. The lower the ratio, and the further below 1:1 you can be, the longer the life span, in theory.
Example: a "basic" 6-71 produces 216 HP..... 216/(6*71)=216/426=50%
The 6-71TI produces 485 HP which is 485/426=113%
Pretty clear the latter will have a higher chance of a coronary long before the former.
But, and it's a HUGE but, that is of course subject to all else being equal. How was it run, and how was it maintained. A properly maintained and run TI has a better chance than a natural that was neglected and abused.
So there is no simple answer to your question.1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay
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09-22-2020 08:51 AM #4Senior Member
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Re: 12V71Ti Life versus 8V92Ti ?
That all sounds logical. I will have to look at the HP's and displacements.
Thank you!
Bob
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Re: 12V71Ti Life versus 8V92Ti ?
Different beasts. 71 series is a dry liner engine 92 is a wet liner. 92’s are easily damaged by overheating and poor coolant management. Most MY engines fail from poor maintenance and lack of use than hours. All these engines in charter or commercial use run far more hours than the weekend warriors
"DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN
Endless Summer
1967 50c 12/71n DDA 525hp
ex Miss Betsy
owners:
Howard P. Miller 1967-1974
Richard F Hull 1974-1976
Robert J. & R.Scott Smith 1976-present
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09-22-2020 11:32 AM #6Senior Member
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Re: 12V71Ti Life versus 8V92Ti ?
I'd say this is true with pretty much all marine diesels. Rarely does a rec user kill an engine due to hours, usually it's lack of cooling passage maintenance that leads to an overheat that kills them. The higher hp ratings have MUCH less room for error on cooling so lack of maintenance usually shows up much quicker on them than say a trawler or hull speed application.
SOUTHPAWS
1986 52C Hull #391 8v92TI
PENSACOLA, FL