 |
|
11-24-2021, 09:36 AM
|
#1
|
|
Guru
City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 520
|
Detroit Diesel 4-71 NA
Any general knowledge about these engines in general and suitability for pushing a Hatteras 58 at displacement speeds? I believe they are 175hp each. Not much extra in reserve I'd think, but maybe adequate for ICW/inshore cruising? Hours unknown at this point.
Thanks.
|
|
|
|
11-24-2021, 10:06 AM
|
#2
|
|
Guru
City: Coupeville Wa.
Vessel Name: Pelorus
Vessel Model: Californian 42 LRC
Join Date: Oct 2015
Posts: 2,191
|
175HP seems high. Screenshot from boatdiesel.com
__________________
Some things are worth doing simply because they are worth doing.
|
|
|
|
|
11-24-2021, 10:14 AM
|
#3
|
|
Guru
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,347
|
If I remember correctly some of the Hatts., the LRC 58' used them. THe 65' LRC went for the 6-71s.
THose boats were intended to be slower passagemakers, not planing boats by any means.
I did meet someone that brought his 58 LRC to the Broughtons, mid west coast B.C. from Hawaii but that was 20 +yrs ago. He did have the 4-53s.
You might also consider looking up the Hatteras forum and asking there.
https://www.samsmarine.com/forums/index.php
|
|
|
|
|
11-24-2021, 10:31 AM
|
#4
|
|
Guru
City: Seattle
Join Date: Jun 2012
Posts: 3,099
|
@mike66, with over 450 posts you're not new here and I'm surprised you haven't read the many, many previous threads on Jimmies.
Personally I'm surprised they didn't put 3-71's or 4-53's in that boat. My 65 footer had twin 6-71's and it was way over-powered. I wish I had a single 6-71 instead. I ran 1325 rpm at 8.25 knots and did not like running those engines so slowly, especially on those continuous, 5-7 day long runs.
|
|
|
|
11-24-2021, 10:38 AM
|
#5
|
|
Veteran Member
City: Battle Ground
Join Date: Dec 2020
Posts: 32
|
Detroit 471 is more in the 130HP range. For a 58 footer you would need two
|
|
|
|
|
11-24-2021, 10:49 AM
|
#6
|
|
Guru
City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 520
|
Just getting started on my research. Own a Lehman single and know quite a bit, but no reason to know anything about Detroits. The Hatteras has twins.
Just was looking for any feedback on general reliability such as Great!, Run Away! Easy to maintain!, nightmare!, that sort of stuff. I am a 95% DIY type of guy. Seems being NA it cuts down on some maintenance, probably overall engine stress by not being pushed to produce too much power.
|
|
|
|
|
11-24-2021, 11:13 AM
|
#7
|
|
Guru
City: Seattle
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 4,010
|
The 6-71 is probably the most common engine in the world. The 4-71 is basically all the same parts. I think this is a better engine than the 4-53 but we are talking insignificant differences. I see no reason to run and finding service and parts will be easy.
|
|
|
|
|
11-24-2021, 11:20 AM
|
#8
|
|
Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 20,262
|
We were looking at 53 LRCs a couple of years ago. It had 471s in it. They are a great engine, easy to maintain and parts are available everywhere and fairly reasonable in prices. I posted a speed vs rpm vs fuel burn that we found on one of them. I no longer have the table, when we decided to go with an express cruiser I deleted all the Hatteras stuff. You may be able to find it here on TF by searching, maybe. I loved the boat but my wife couldn’t get past how dirty it was so we didn’t make an offer on it. Great layout.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
|
|
|
|
|
11-24-2021, 11:40 AM
|
#9
|
|
Guru
City: Reno, Nevada
Join Date: Apr 2019
Posts: 1,175
|
Quote:
Originally Posted by Comodave
We were looking at 53 LRCs a couple of years ago. It had 471s in it. They are a great engine, easy to maintain and parts are available everywhere and fairly reasonable in prices. I posted a speed vs rpm vs fuel burn that we found on one of them. I no longer have the table, when we decided to go with an express cruiser I deleted all the Hatteras stuff. You may be able to find it here on TF by searching, maybe. I loved the boat but my wife couldn’t get past how dirty it was so we didn’t make an offer on it. Great layout.
|
https://www.trawlerforum.com/forums/...23&postcount=3
|
|
|
|
|
11-24-2021, 11:46 AM
|
#10
|
|
Guru
City: Seattle
Join Date: Jun 2012
Posts: 3,099
|
8 knots 1400 rpm. Seems like an ideal point
|
|
|
|
|
11-24-2021, 11:46 AM
|
#11
|
|
Guru
City: San Diego, CA
Vessel Name: Second Chance
Vessel Model: 42' Uniflite Double Cabin
Join Date: Jul 2017
Posts: 828
|
71 series Detroits are great for a DIY guy. I've got a thread here detailing an overhaul of a 671, it's really the same engine, just two cylinders longer.
If have a bit of clearance in the engine room you can do an in-frame rebuild right there in the boat if you so desired. If you can find an old salt to show you how to run the rack and tune the governor you'll be able to do all your own work on one no problem.
|
|
|
|
|
11-24-2021, 12:16 PM
|
#12
|
|
Guru
City: San Diego, CA
Vessel Name: Second Chance
Vessel Model: 42' Uniflite Double Cabin
Join Date: Jul 2017
Posts: 828
|
Some how this was a duplicate!
|
|
|
|
|
11-24-2021, 12:46 PM
|
#13
|
|
Guru
City: Seattle
Join Date: Jun 2012
Posts: 3,099
|
If OP wants to run those 4’s a bit warmer (say 1600-1700 rpm) then it’s easy enough to use smaller injectors. Could drop the rating down to the 110-120hp range. Repitch your props.
|
|
|
|
|
11-24-2021, 01:03 PM
|
#14
|
|
Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 20,262
|
Quote:
Originally Posted by Alaskaflyer
|
Yup, that is it, thanks for finding it. And my thumb looks great, doesn’t it…
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
|
|
|
|
|
11-24-2021, 01:05 PM
|
#15
|
|
Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 20,262
|
Quote:
Originally Posted by sbman
71 series Detroits are great for a DIY guy. I've got a thread here detailing an overhaul of a 671, it's really the same engine, just two cylinders longer.
If have a bit of clearance in the engine room you can do an in-frame rebuild right there in the boat if you so desired. If you can find an old salt to show you how to run the rack and tune the governor you'll be able to do all your own work on one no problem.
|
In the 53 Hatteras LRC there is about 6’6”, or more, of headroom in the engine room. Quite a bit on the outboard side too. Great engine room to work in.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
|
|
|
|
|
11-24-2021, 01:53 PM
|
#16
|
|
Scraping Paint
City: Ocean park
Vessel Name: Tug life
Vessel Model: Nordic tug 26
Join Date: Jun 2021
Posts: 255
|
71 series Detroit is probably one of the best engines ever made some I will argue the 60 series is better nevertheless one of the best engine that you could possibly have fairly easy to inframe as already been stated most of the people reading this form should be jealous of that Engine
|
|
|
|
|
11-24-2021, 02:20 PM
|
#17
|
|
Guru
City: Seattle
Join Date: Jun 2012
Posts: 3,099
|
Best of all, they are really, really quiet. Hence the double layer of foam earplugs and ear muffs that I always wore, just to be stylish of course.
|
|
|
|
|
11-24-2021, 02:46 PM
|
#18
|
|
Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 20,262
|
Quote:
Originally Posted by Mako
Best of all, they are really, really quiet. Hence the double layer of foam earplugs and ear muffs that I always wore, just to be stylish of course.
|
Ha ha, at least they have a throaty sound not an annoying whine.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
|
|
|
|
|
11-24-2021, 03:12 PM
|
#19
|
|
Guru
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,962
|
The inline 71 series are probably the most reliable Detroit, but 53s are a close second. I've been running them or most of 60 years, private, commercial, and in the military. If you learn the adjustments, they are very reliable, low maintenance engines. But don't let the average marina mechanic touch them. I suppose a marina mechanic could learn to change oil and with some instruction, the fuel filters. There is no bleeding necessary like injector pump engines.
If you keep the fuel and oil clean, once the adjustments are made, they go about a decade with just the occasional check. I run 2 micron fuel filters and haven't changed an injector since 2011 when I had these rebuilt. Until covid, about 500 hours a year.
My engine room is well insulated and directly under the salon. At full rpm, twin 671s, I can carry on a typical conservation. You push the button, warm them up, and go.
|
|
|
|
|
11-24-2021, 03:47 PM
|
#20
|
|
Senior Member
City: Kasilof Alaska
Join Date: Aug 2015
Posts: 173
|
My old fishing partner has a 3-71 in a 53 foot skookum. Puts 6000 hours a year on it. Rebuilds it every 5 years. Engine has been rebuilt 3 times so over 100,000 on it. Not sure how you can get much more reliable than that. Trusts that engine all year long in the gulf of Alaska and the Bering Sea.
|
|
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Trawler Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
