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
Welcome to the Hatteras Owners Forum & Gallery. Sign Up or Login
+ Reply to Thread
Results 1 to 10 of 54
Thread: 12v71 TI Detroit’s
-
09-01-2019 11:45 AM #1Senior Member
- Join Date
- Dec 2014
- Posts
- 406
12v71 TI Detroit’s
-
Re: 12v71 TI Detroit’s
-
09-01-2019 05:42 PM #3
Re: 12v71 TI Detroit’s
I have twin turbo 12-71 TA's rated @ 870hp
-
09-01-2019 06:14 PM #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.
-
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
-
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
-
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
-
09-03-2019 01:05 PM #8Senior Member
- Join Date
- Apr 2008
- Posts
- 494
-
09-07-2019 09:48 AM #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.
-
09-07-2019 11:50 AM #10Senior Member
- Join Date
- Apr 2008
- Posts
- 494
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.