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  1. #1

    12v71 TI Detroit’s

    I have seen hp ratings of , 650,750 850 etc. for these motors . Were they special from J/T , Covington ? What are the differences, heads,injectors, turbos ? Can you easily rebuild a 650 hp motor to 850hp ? Regards, Edward

  2. #2

    Re: 12v71 TI Detroit’s

    Quote Originally Posted by edward View Post
    I have seen hp ratings of , 650,750 850 etc. for these motors . Were they special from J/T , Covington ? What are the differences, heads,injectors, turbos ? Can you easily rebuild a 650 hp motor to 850hp ? Regards, Edward
    I've seen 650 and 675 for my Ti engine. The TA's are higher hp. As far as I know, the N90's are the largest injectors. My sense is you could go from 17 to 1, to 18 to 1, and go to a bigger turbo.. don't know exactly what that would net you.. but more power!

  3. #3

    Re: 12v71 TI Detroit’s

    I have twin turbo 12-71 TA's rated @ 870hp

  4. #4

    Re: 12v71 TI Detroit’s

    Mine are TI's and rated at 840HP. Covingtons. I have heard there is a lot to go back natural but not sure about increasing HP.

  5. #5

    Re: 12v71 TI Detroit’s

    Blower gear ratio change, maybe larger inter cooler, larger oil cooler, larger HE, possibly different water pump plus what’s been mentioned. Should already be four valve heads.
    Semper Siesta
    Robert Clarkson
    ASLAN, 1983 55C #343
    Charleston, SC

  6. #6

    Re: 12v71 TI Detroit’s

    Mine are TI's rated at 1000 hp, so it CAN be done.
    Whether it SHOULD be done.....I would say no!
    "The older I get, the faster I was......."

    1979 60C "Ohana" hull# 331

  7. #7

    Re: 12v71 TI Detroit’s

    There's a lot of different parts on the high horse power turbo DD 2 strokes compared to the parts used and the timing of the lower rated turbo engines. Remember for a long time each of the DD distributors were building their own versions which is why there's so many horsepower differences. Many of those custom parts are no longer available.
    CRICKET
    1966 HAT50C101
    Purchased 1985 12v71Ns
    Repowered 1989 with 8v92TI
    Repowered 2001 with 3406E

  8. Re: 12v71 TI Detroit’s

    Quote Originally Posted by luckydave215 View Post
    Mine are TI's rated at 1000 hp, so it CAN be done.
    Whether it SHOULD be done.....I would say no!
    Are these Covington engines?

  9. #9

    Re: 12v71 TI Detroit’s

    I don't think there is anything special about whether the old Detroit 12V71TI engines are BKX or Covington etc. What they did was use big injectors and big turbos. That's the recipe for approx 850HP. Mine dyno 860hp.

    My turbo's are: R5101513
    Injectors are: 9215P

    The original injectors that the builders used are old part numbers I believe.

  10. Re: 12v71 TI Detroit’s

    The poster that has 1000 HP 12V-71TIs has had a lot more done to those engines than just larger turbos and injectors.

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