Page 1 of 2 12 LastLast
Results 1 to 25 of 45

Detroit 6V53TI 400HP marine diesel engine

  1. #1
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Detroit 6V53TI 400HP marine diesel engine

    Anyone here know anything about these diesels? I have read opinions ranging from "reliable workhorse" to "over-boosted time bomb". I'm looking at a boat with a pair of these that have about 2000 hours on them. These are a very old design 5.2 liter V6 two stroke supercharged (and turbocharged in the higher HP configurations) engine that evolved over the years and eventually peaked at 400 HP. The boat appears to be very well maintained and the engines in said boat were probably operated at less than 1/4 of rated HP for 98% of those hours (it's just the way these semi-displacement cockpit motor yachts are normally used).

    0 Not allowed!

  2. #2
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    2 stroke diesel? what?

    0 Not allowed!

  3. #3
    Changes come butcher bergs's Avatar
    Join Date
    Jul 2007
    Location
    the humbling river
    Posts
    12,220

    Re: Detroit 6V53TI 400HP marine diesel engine

    Similar design and operation in nitro RC engines.

    0 Not allowed!

  4. #4
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by xrocket21 View Post
    2 stroke diesel? what?
    Oh yeah, Detroit Diesels are, as far as I know, all two stroke and they have been around since before WWII. Ever hear of a 6-71 blower? Those came right off Detroit 6-71 engines, which were part of the first generation of diesels Detroit built. I could be wrong, but I think they are all supercharged solely because (unlike typical two-stroke engines) they don't use the crankcase as part of the intake system.

    Edited to add: They use poppet valves like a 4 stroke, but only for exhaust.

    0 Not allowed!
    Last edited by stoinkythepig; 11-01-18 at 09:06 AM.

  5. #5
    Lifer Falko's Avatar
    Join Date
    Mar 2010
    Location
    MoonTown
    Posts
    4,371

    Re: Detroit 6V53TI 400HP marine diesel engine

    That's a good amount of hp for a ~300cuin diesel. If they weren't run hard, I think you'd be fine though. But I can't imagine that design wasn't originally slated for maybe 250hp at the start? Any leaks apparent?

    0 Not allowed!
    Dad's Dream: Earn enough money to live the life that his wife and kids do.

  6. #6
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by Falko View Post
    That's a good amount of hp for a ~300cuin diesel. If they weren't run hard, I think you'd be fine though. But I can't imagine that design wasn't originally slated for maybe 250hp at the start? Any leaks apparent?
    The lowest HP versions were 185 HP. They are a 318 CI V6 (which you can determine from the name "6V53", "6" means 6 cylinders, "V" means V cylinder layout, and "53" means 53 cubic inches per cylinder). All DDs were named in this way.

    0 Not allowed!
    Last edited by stoinkythepig; 11-01-18 at 09:20 AM.

  7. #7
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Detroit Diesels also have the best exhaust sounds ever for diesels: YouTube

    1 Not allowed!

  8. #8
    Your Father csmutty's Avatar
    Join Date
    Sep 2008
    Location
    Pomfret Center, CT
    Age
    27
    Posts
    9,986

    Re: Detroit 6V53TI 400HP marine diesel engine

    Detroit also made 4 stroke as well.

    Did some research on the 2 cycle ones recently and came to the conclusion that they sound awesome, will always leak oil, and are heavy as fuck.

    0 Not allowed!
    -Christian LRRS/CCS #316 ECK Racing GMD Computrack Boston | Pine Motorparts/PBE Specialists | Woodcraft | Street & Competition | OnTrack Media

    2011 Pit Bike Race CHAMPION!

  9. #9
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by butcher bergs View Post
    Similar design and operation in nitro RC engines.
    Ill be damned, you learn something new every day!

    I have a ton of RC cars and know exactly what youre talking about!

    That's awesome.

    0 Not allowed!

  10. #10
    Lifer loudbeard's Avatar
    Join Date
    Jun 2013
    Location
    Rehoboth MA
    Age
    35
    Posts
    3,218

    Re: Detroit 6V53TI 400HP marine diesel engine

    A buddy of mine is a marine mechanic in Kittery, I sent him an email to see if he has any expertise with these.

    0 Not allowed!
    I went to MMI I know what Im doing here chief

  11. #11
    Lifer Falko's Avatar
    Join Date
    Mar 2010
    Location
    MoonTown
    Posts
    4,371

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by stoinkythepig View Post
    The lowest HP versions were 185 HP. They are a 318 CI V6 (which you can determine from the name "6V53", "6" means 6 cylinders, "V" means V cylinder layout, and "53" means 53 cubic inches per cylinder). All DDs were named in this way.
    So the 6V71's were some pretty big 2 strokes.

    0 Not allowed!
    Dad's Dream: Earn enough money to live the life that his wife and kids do.

  12. #12
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    6-71 blower yessssssssssssssssssssssssssssssssssssssss


    0 Not allowed!

  13. #13
    Backwoods lobster boy number9's Avatar
    Join Date
    Aug 2005
    Location
    Hanover, NH
    Posts
    3,529

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by stoinkythepig View Post
    Oh yeah, Detroit Diesels are, as far as I know, all two stroke and they have been around since before WWII. Ever hear of a 6-71 blower? Those came right off Detroit 6-71 engines, which were part of the first generation of diesels Detroit built. I could be wrong, but I think they are all supercharged solely because (unlike typical two-stroke engines) they don't use the crankcase as part of the intake system.
    This is correct; you can't have a nautrally-aspirated diesel two-stroke.

    0 Not allowed!
    '08 Ducati HyperMotard 1100S, '14 Subaru XV Crosstrek

  14. #14
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by number9 View Post
    This is correct; you can't have a nautrally-aspirated diesel two-stroke.
    Why not?

    Referring back to the RC car nitro engines, none of them are forced induction?


    Sidenote, I remember an argument about RC superchargers claiming they couldn't work because any boost would just blow out the exhaust port at overlap....

    0 Not allowed!

  15. #15
    Lifer loudbeard's Avatar
    Join Date
    Jun 2013
    Location
    Rehoboth MA
    Age
    35
    Posts
    3,218

    Re: Detroit 6V53TI 400HP marine diesel engine

    I have a friend looking at a boat with 2 Detroit 6V53TI rated at 400HP. He's not familiar with the engine and his research has led him to either "great workhorse of an engine" to "over-boosted time bomb." The pair have about 2000 hours on them with the majority of time being at 1/4 of their rated horsepower, they're in a cruising yacht.

    Anyhow, I said I have a buddy who may have some experience with them. Can you provide any insight?
    Yea, are you sure your friend is not you? Have him give me a call and I can talk him out of it.
    PM me if you'd like his number. He has his own shop, very knowledgeable guy.

    0 Not allowed!
    I went to MMI I know what Im doing here chief

  16. #16
    Lifer Garandman's Avatar
    Join Date
    Jun 2008
    Location
    Dorchester, MA / Mt Sunapee, NH
    Posts
    9,300

    Re: Detroit 6V53TI 400HP marine diesel engine

    We investigated the typical working life of diesels at one point, and it was more in the range - 4-7,000 hours before needing . The range is broad but 2,000 hours isn't a concern.

    You would certainly want a surveyor or mechanic or both to survey the boat before purchase.

    0 Not allowed!
    1975 BMW R90/6 | 2008 Triumph Tiger 1050 ABS | 2009 Honda CRF100F | 2009 Yamaha TrailWay 200 | 2012 Yamaha WR250R | 2016 Honda CB500FA | 2016 Suzuki GSX-R750

  17. #17
    Your Father csmutty's Avatar
    Join Date
    Sep 2008
    Location
    Pomfret Center, CT
    Age
    27
    Posts
    9,986

    Re: Detroit 6V53TI 400HP marine diesel engine

    Detroit's are totally different animals.

    0 Not allowed!
    -Christian LRRS/CCS #316 ECK Racing GMD Computrack Boston | Pine Motorparts/PBE Specialists | Woodcraft | Street & Competition | OnTrack Media

    2011 Pit Bike Race CHAMPION!

  18. #18
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by csmutty View Post
    Detroit's are totally different animals.
    expand please? Im enjoying learning about these bad larrys

    0 Not allowed!

  19. #19
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by Garandman View Post
    We investigated the typical working life of diesels at one point, and it was more in the range - 4-7,000 hours before needing . The range is broad but 2,000 hours isn't a concern.
    I've read that in sport fishing boats, 2000 hours is pretty much it for these engines and they will need a rebuild. That said, those boats are typically run hard (20+ knots) because the goal is to get to the canyon, get some big fish and get home, fuel-costs-be-damned. The boat I am looking at is typically run at a gentle 9 knots because the goal is to get from one quiet anchorage to the next while not spilling one's Pusser's Painkiller or spending an extra dime on fuel.

    Quote Originally Posted by Garandman View Post
    You would certainly want a surveyor or mechanic or both to survey the boat before purchase.
    Absolutely. That was always part of the plan regardless of the boat we choose.

    The Detroits were the base engine in this model (Tollycraft 44 or 45) and most people opted to spend a little more for 375HP Cat 3208s instead, thus there are very few Detroit equipped boats like this out there and I never had to consider one. 3208s have a stellar reputation in the marine world so I have no qualms about buying a boat with those and all the boats we've considered so far are equipped with them (but they all also require an airplane trip to see in a reasonable time frame). This boat just popped up on the market last week and is close to enough to drive to in less than 3 hours; would be stupid not to at least have a look at it...

    If the difference between the DDs and the Cats is 40 hours a year more maintenance on average, it might be something I'd be willing to live with. Both the Cats and the DDs are supposed to be VERY easy to work on with excellent factory service manuals, and supposedly both have excellent parts availability. I've also read that one can easily do a DD rebuild without taking the engine out of the boat, and with very few and relatively inexpensive special tools. I've seen rebuild kits for these DDs with new pistons, rings, gaskets, bearings, cylinder liners, etc. for less than two grand. The Cats are substantially more complex and expensive to rebuild (they don't have cylinder sleeves, thus they typically need a re-bore during rebuild), but rarely require it in live-aboard boats.

    While I'd prefer engines that require less work, If I can save 30 grand on the purchase price, it could be worth it to me. I'm pretty handy, I have a huge collection of tools and I love projects. The reality is, if a friend had one of these engines that needed a rebuild, I'd be the first volunteer to jump in and help with it for the fun of it. I can see myself spending part of my retirement in other boat's engine rooms earning a little extra cash while doing something I'd probably do for the fun of it anyway...

    0 Not allowed!

  20. #20
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by xrocket21 View Post
    expand please? Im enjoying learning about these bad larrys
    Here's a great animation that shows how they work:



    YouTube

    0 Not allowed!

  21. #21
    Dictionary quoting knob stoinkythepig's Avatar
    Join Date
    Dec 2002
    Location
    Raymond NH
    Age
    52
    Posts
    4,552

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by xrocket21 View Post
    6-71 blower yessssssssssssssssssssssssssssssssssssssss

    The reason people started using 6-71 blowers on big gas V8s back in the day was due to the fact that they were sized to deliver 426 (6x71) cubic inches of air per crank revolution which is how much air a 6-71 (426 cubic inch) two stroke needs in normally-aspirated operation, so despite the fact that there's a supercharger on the engine, it's not supercharged and is only operating at roughly 100% volumetric efficiency. On a four stroke, 426 cubic inch engine (like the old Chrysler Hemi), a 6-71 blower provides exactly double the air needed per revolution (assuming it's not under-driven or over-driven), thus a the engine is operating at close to 200% VE and is clearly "supercharged". Obviously, one can adjust the blower speed with different-sized pulleys to match the design needs for any size engine and boost level, within engineering limits; I just used 426 CI as an example.

    The 6V53TI engines I'm looking at have blowers and turbochargers to achieve a little more than double the HP of the blower-only (185HP) versions of the same engine. This is done at the expense of longevity. I have heard that the turbo dramatically muffles the harsh but awesome DD exhaust note, but that's probably a good thing on a pleasure boat.

    0 Not allowed!

  22. #22
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    I had my STI motor built (the second time) by Coughlan machine in norwood MA. I used to DROOL over the marine motors.

    Engine Gallery

    A matching pair of sparkly clean big bocks with blowers on top was a sight to behold. Its a big stack from the bottom of the oil pan to the top of the intake!

    1 Not allowed!

  23. #23
    Lifer Falko's Avatar
    Join Date
    Mar 2010
    Location
    MoonTown
    Posts
    4,371

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by xrocket21 View Post
    I had my STI motor built (the second time) by Coughlan machine in norwood MA. I used to DROOL over the marine motors.

    Engine Gallery

    A matching pair of sparkly clean big bocks with blowers on top was a sight to behold. Its a big stack from the bottom of the oil pan to the top of the intake!
    I was talking to a guy several years back (before the noise ordinances chased the big dogs off A-bay) that had a big go fast (Fountain 42) with twin blown 502's. Due to the squeezing of all the hp possible and running them to the max most of their life, the engines needed re-freshening around every 150hrs. Big $$ to play with the big boys. One of the other boats there was running twin Lycoming turbines. That's a level beyond my comprehension.

    0 Not allowed!
    Dad's Dream: Earn enough money to live the life that his wife and kids do.

  24. #24
    TWINS! xrocket21's Avatar
    Join Date
    Jun 2007
    Location
    Central Maine
    Age
    37
    Posts
    4,645

    Re: Detroit 6V53TI 400HP marine diesel engine

    Quote Originally Posted by Falko View Post
    I was talking to a guy several years back (before the noise ordinances chased the big dogs off A-bay) that had a big go fast (Fountain 42) with twin blown 502's. Due to the squeezing of all the hp possible and running them to the max most of their life, the engines needed re-freshening around every 150hrs. Big $$ to play with the big boys. One of the other boats there was running twin Lycoming turbines. That's a level beyond my comprehension.
    I was at the rockland lobster fest with my parents and their 34' sailboat (for sale if anyone is feeling froggy) and a guy in a go fast boat pulled up. The rockland harbor guy told him he couldn't park where he was pulling up, guy said he was pretty much out of gas and had to park and ignored the harbor guy. I was standing there drooling and he tossed me a line and asked for help.

    Oh man... the throttle blips of him just parking the fucker, the exhaust noise bouncing off the mainland... gave me goose bumps.

    He remote activated the doors on the rear and they opened up like cold war bomb bay doors and you could feel the heat coming out and hear the popping hot/cooling metal noises.

    Damn thing had THREE blown im assuming big blocks. Absolutely bonkers. I was in love.

    I remember that the cockpit had basically three padded tubes you stand in, no seats. Single row of gauges going from one side of the dash to the other, must have been 30 gauges.

    0 Not allowed!

  25. #25
    Changes come butcher bergs's Avatar
    Join Date
    Jul 2007
    Location
    the humbling river
    Posts
    12,220

    Re: Detroit 6V53TI 400HP marine diesel engine

    All the reading I've done on this engine tells me nothing more than they like to leak oil....a lot....and often.

    Haven't come across and real reliability issues as reported by owners other than a voiced concern for the HP vs displacement (hence the "overboosted timebomb" sentiment) but nothing that says they are outwardly prone to grenading.


    0 Not allowed!

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •