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Hatteras 50 with Cat 3412e

Discussion in 'Hatteras Yacht' started by tbonztoys, Dec 13, 2019.

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  1. tbonztoys

    tbonztoys New Member

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    Looking at Hatteras 50 3412e year 2000. 5000 hrs on engines. Any concerns i should be aware of ? What kind of longevity should these engines give, assuming reg and proper maint. Any first hand experience with actual fuel burn/ speeds/ rpm data would be appreciated. Thanks
  2. Pascal

    Pascal Senior Member

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    I ran a 2003 70 MY with 3412Es. I put 4000 hours on them, they had 5400 hours when the boat was sold and had a clean oil analysis. All with just routine maintenance except for one starter, one fuel cooler and a couple minor things I forgot.

    they re one of the best marine engine made. They could be good for another 5000 depending not just about maintenance but how they were run. I m guessing that in a SF they were pushed harder than in a MY. Your cat surveyor should be able to see how many gallon were burned.
  3. Capt J

    Capt J Senior Member

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    What HP rating? But somewhere around 110-120 GPH for both at 80% if they're the higher HP version. They should go more hours......maybe 6-8000 in a SF I would guess, could be as much as 10,000 hours. But really depends on how they were treated. I managed a boat with one set that sat a lot directly on the ICW where it would get waked and rock (water running in and out of exhaust) and at 1200 hours in 17 years it needed new cylinder heads and turbo's...….
  4. tbonztoys

    tbonztoys New Member

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    Capt j
    Hp is 1400 on 3412.
  5. bayoubud

    bayoubud Senior Member

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    Our last boat was a Hat 50c. Best I remember @1950 = 30 kt... 85 gph, @1850 = 28kt...72 gph, tops 37 kt. Those numbers were around 1/2 fuel. Great engines, still stay in touch with the buyer... he uses a lot... all is well and had the aftercoolers cleaned and tested maybe a year ago... regular maintenance with over 3000hrs. Comfortable boat with a tight er if you plan to do maintenance.
  6. PacBlue

    PacBlue Senior Member

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    The good thing about those particular CAT’s is that they are towards the end of the generation of 3412’s and have all the bugs worked out over time as CAT transitioned the product model to the C30/32.Reliability should be there strength.
  7. Capt Ralph

    Capt Ralph Senior Member

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    1400 on 3412E, the last series.
    The early 3412s had lower numbers thru the generations.

    I always felt Cat developed this engine the correct way. Start with a bomb proof block and improve and improve and improve. Rather than just another block and bolt stuff on till it blows (32s).
  8. bayoubud

    bayoubud Senior Member

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    Meant to add, 5000 engine hrs on most any high performance boat reduces the value. In this case your looking at hrs plus 20 years wear and tear, current cost for after coolers and he's if needed, along with gears. You would definitely want to see repair/maintenance records as far back as possible. That er is tight for a rebuild in place, has cutouts in salon floor for access from top for major work, still not much room around or under engines. Get an in-depth survey, borescope, not just a sea trial/computer readout. Appears the boat has had used regularly which is better that a dock queen. If good maintenance by owner those 3412's could still have a lot of hours left. Also, inspect engine stringers, there was some that had problems.
  9. Capt J

    Capt J Senior Member

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    Yes, I've run the 1400 HP 3412's. I was asking because the HP determines the fuel burn......the ones I ran burned just under 120 GPH at 80% load. They were good running motors, but very thirsty under 1000 rpms compared to 12v71's or 92's.
  10. Pascal

    Pascal Senior Member

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    I m not sure how you define thirsty under 1000rpm?

    that 70’ johnson I ran for years used 18 GPH combined at 1000 RPM, combined. Every other boat with wide beam and DDs used pretty close to that.

    if anything i would say an electronic engine has to be cleaner than mechanical.
  11. bayoubud

    bayoubud Senior Member

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    Our 3412's in the Hat 50c on high idle (650 rpm) burned 6 gph total at 8.2 kts. I was amazed, gen might burn 1gph, so 7gph total is still better than 1 mpg. Hard to believe 24 cylinders could do that economy! It was even better on low idle at 7.2 kts. Now, if you touched the throttles it changed fast!
  12. Capt Ralph

    Capt Ralph Senior Member

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    Yes, The E's were great and clean at low rpm.
  13. Capt J

    Capt J Senior Member

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    In comparison I ran a 75' Hatteras MY on the great loop, with 12v71 TI's we were at 12 gph total at 10.2 knots.
  14. Capt Ralph

    Capt Ralph Senior Member

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    Hard to compare engines in different boats. Different boats require different amounts of hp to move at various speeds.
    Rough math tells me your Hatt was drawing 120hp per engine.

    My 12V71TI Bert draws a good bit more at 10 Kts. No stuff, I'm fatter than the Hatts.
  15. Pascal

    Pascal Senior Member

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    what was the beam? How did you determine the burn rate? 12 GPH is barely more than my old 8V71w were burning pushing a 16’ beam 53 footer at 9.2 kts. I ve run a few other DD boats and never gotten that kind of economy.
  16. Capt J

    Capt J Senior Member

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    Just under 18' but it was a 65' Hatteras MY extended to 75' and cockpit was mostly flat bottomed. I calculated the burn. One leg I did 550 NM at 10 knots...….ran at cruise 30 minutes, 2x a day. But the fuel burn chart also matched the 12 gph I was calculating. She was at exact hull speed at 10.3 knots...…...doing 9.2 knots in a 53' footer, you're above hull speed and pushing a lot more water.