A Question about Detroit Diesel 6-71T HorsePower

[CarribBop]

I recently discovered an internet site with standard diesel engine specifications for DD, CATs and Cummins.
It lists the DD6-71 as having 238HP and 285HP for the DD6-71T, there is no TI or TO listed.

Nowhere in the specs of any of the boats listed on the web do I see HP anywhere near these specs.
In all the listings I see on the web, that bother to list the HP, the DD 6-71T?es are listed as having either 390HP and 485HP.

Did any 6-71 turbo generation boats come with these lower HP rated engines, say closer to the 285HP? This would have been a great option, for the original buyer, to get the most life from the engines, hind-sight is 20-20.

Is the HP of a boat's engines listed anywhere on the boat, so you know what the actual HP is?

Pascoe writes that the DDes can be easily de-rated with injector swaps.
Talking to a CAT mechanic, he said de-rating a CAT involves more than changing injectors because the complete engine has been modified. Can the DD6-71TI be de-rated without a total rebuild?

 

[Boatsb]

I recently discovered an internet site with standard diesel engine specifications for DD, CATs and Cummins.
It lists the DD6-71 as having 238HP and 285HP for the DD6-71T, there is no TI or TO listed.

Nowhere in the specs of any of the boats listed on the web do I see HP anywhere near these specs.
In all the listings I see on the web, that bother to list the HP, the DD 6-71T?es are listed as having either 390HP and 485HP.

Did any 6-71 turbo generation boats come with these lower HP rated engines, say closer to the 285HP? This would have been a great option, for the original buyer, to get the most life from the engines, hind-sight is 20-20.

Is the HP of a boat's engines listed anywhere on the boat, so you know what the actual HP is?

Pascoe writes that the DDes can be easily de-rated with injector swaps.
Talking to a CAT mechanic, he said de-rating a CAT involves more than changing injectors because the complete engine has been modified. Can the DD6-71TI be de-rated without a total rebuild?

If its on the internet it must be true.


Do you have a specific question on your motors? .

 

[captddis]

I recently discovered an internet site with standard diesel engine specifications for DD, CATs and Cummins.
It lists the DD6-71 as having 238HP and 285HP for the DD6-71T, there is no TI or TO listed.

Nowhere in the specs of any of the boats listed on the web do I see HP anywhere near these specs.
In all the listings I see on the web, that bother to list the HP, the DD 6-71T?es are listed as having either 390HP and 485HP.

Did any 6-71 turbo generation boats come with these lower HP rated engines, say closer to the 285HP? This would have been a great option, for the original buyer, to get the most life from the engines, hind-sight is 20-20.

Is the HP of a boat's engines listed anywhere on the boat, so you know what the actual HP is?

Pascoe writes that the DDes can be easily de-rated with injector swaps.
Talking to a CAT mechanic, he said de-rating a CAT involves more than changing injectors because the complete engine has been modified. Can the DD6-71TI be de-rated without a total rebuild?

Sure. pull the throttle back.

 

[CarribBop]

Question about Detroit Diesel 6-71T Horse Power simplified:

if a 6-71N at 238HP will last 10,000-20,000hrs if you look after it
and if a 6-71T at 485HP will last 2000hrs if your lucky

1. Can you de-rate a 6-71T and get 6-71N Hours?
2. Did any of the production 6-71T?es, installed in a Hatteras, come rated at less than 390HP?

 

[Boatsb]

Many different hp ratings over the years. 310 for naturals was common. 390 to 450 was common too. 485 was tops from only one marinizer.

 

[captddis]

Short answer is no you can't just change injectors and remove turbo's and intercoolers and make a N engine. The big item is the 17:1 compression rating on the T's compared to the 18:1 on N's not to mention a number of items. You can run the turbo engines at hull speed and they will outlast you. Or buy a boat with naturals.

 

[seasalt]

I believe that both Covington and J&T jacked them up to 485. I owned a set of Covington 6-71TIB's.