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hatteras 58 8v71TTA turbo replacement

Discussion in 'Hatteras Yacht' started by henry mccoy, Dec 1, 2015.

  1. henry mccoy

    henry mccoy New Member

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    Is there a better turbo replacement than the originals? sources? issues?
  2. bigbill

    bigbill New Member

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    if you want to replace what you have with better turbo's, you may want to check in to wet turbos. much cooler engine room and no need to have the blanket insulation.
  3. henry mccoy

    henry mccoy New Member

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    thanks bill, just curious if there any bolt on replacements that anyone has had experience with

    henry
  4. Capt Ralph

    Capt Ralph Senior Member

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    Without altering the designed tune of the engine, It is best (IMO 71 Junkie) to keep all stock. My 12V71TIs still use the original dry turbos and going strong.

    With minimum / zero maintenance, it is amazing the abuse a turbo charger goes thru and still works so reliably. Nobody makes a bad turbo, stay stock.
  5. Oscarvan

    Oscarvan Senior Member

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    Out of curiosity, what goes bad on them? My guess is bearings. Are they replaceable? Rebuilt turbos are not cheap..... what else wears out?
  6. Capt Ralph

    Capt Ralph Senior Member

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    At many, many thousands of RPM, the common shaft is under a lot of heat and pressure. That bearing holds it all in place and together. That poor little bearing. Single little oil line fed to it.
    A fraction of a second without oil, poor oil quality, debris spec and it's gone.

    Surprising, lack of use and abuse is the main failure of a turbo.
  7. Capt J

    Capt J Senior Member

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    The bearings and seals. Sometimes if the bearing has gone bad the housing needs a core or to be machined.
  8. Capt Ralph

    Capt Ralph Senior Member

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    Once that bearing allows the shaft to wobble, shift or fly out of tolerances at all, the turbine wheels/vains may come in contact with the surrounding housing. Usually not good for many parts involved,, including the whole engine.
  9. Oscarvan

    Oscarvan Senior Member

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    So what are the impending signs of doom...... noises? That's how it is on car gas engines....
  10. RER

    RER Senior Member

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    Impending? No. Occurring? Yes. Loss of power. Black smoke.

    BTW ...the 8v71 is TI - Inter Cooled not TA - After Cooled. I think TA was truck only.
    Last edited: Dec 2, 2015
  11. henry mccoy

    henry mccoy New Member

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    turbos fail in a couples ways. the ones like on the 8-71tti are held together with a stainless steel band and bolt that breaks the turbo leaks exhaust gas and loss of power.
    turbos also fail from lack of use. corrosion and rust locks the turbo up so it cant spin. loss of power. black smoke.
    they also fail from loss of lubrication the oil feed line ruptures turbo fails and possible fire results with the non water cooled type..
    they can also fail from ware . start making some noise from the shaft wobbling and striking the housing results in loss of power
  12. Oscarvan

    Oscarvan Senior Member

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    Frequent ER checks...... Or a natural. Check.
  13. Capt J

    Capt J Senior Member

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    Also pull off the air cleaners every oil change and check the turbine for end play (movement side to side) and check the inside of the housing to make sure the turbine is not rubbing against the inside body of the turbo.
  14. henry mccoy

    henry mccoy New Member

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    your correct RER the marine 8-71 tti not 8-71tta :)

    henry
  15. Capt Ralph

    Capt Ralph Senior Member

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    Hum,, eerr,, aahh,,

    TA's were used in marine engines. 71s and 92s used them. Mostly during the Penski era and usually (not always) with DDEC.

    To ensure were talking about the same TA option, a sea water air cooler in the air box below the blowers.

    It was expensive, when they leaked, usually catastrophic.

    Not sure how a truck could keep a TA cool.
  16. RER

    RER Senior Member

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    I'm not aware of a marine application 8v71TA. Nobody said anything about 92's.
  17. Capt Ralph

    Capt Ralph Senior Member

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    That should be just; 8V71TI or 8V71TA.

    DDC gave up on that straight (experimental) 8 during the 40s. Packard did also.
  18. Capt Ralph

    Capt Ralph Senior Member

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    I didn't mean anything negative about 92s, just thought I'd throw that in at no extra charge.
  19. Capt J

    Capt J Senior Member

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    I've run 2 sets of 6-71 TA's, one in a 38' Buddy Davis SF and another was a 48' ocean express. They were mid 90's boats. There were also 71 TAB's too (turbo aftercooled with a bypass).
  20. Capt Ralph

    Capt Ralph Senior Member

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    We manage a boat with 671tib's. Dock queen that fast idles around town for the last 10 years. Owner found diesel fuel cheap this fall and ran the heck out of her to da bottom (Key West) and back to Jax.
    Blew out the air box cover gaskets. WOW, What a mess.
    Owner has an ear to ear grin. In 10 years, never ran her at speed for more than a few minutes..
    Took a few hours to explain what he did.

    AND, how much of a job to clean up.

    Now, 6-71 TAB's has to be a wild ride.