r/whatisit • • 5h ago

New, what is it? What is this?

Post image

Seen on a Massachusetts highway with Maine plates on the trailer. Engine? For what? I’ve seen a large 100’ diesel engine before but it was a long time ago and I forget more than I remember.

628 Upvotes

250 comments sorted by

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480

u/The_Last_W0rd 5h ago

big diesel boat engine

108

u/lonetraveler73 4h ago

I've seen bigger...no really. I worked for a diesel engine company. All heavy equipment. Let's see a mining dump truck engine in comparison.

54

u/cmb1213 4h ago

If we’re comparing engine sizes, I sail on containerships with slow speed diesels. Talking idling at 26 rpm and rated speed of 96 rpm

20

u/Certain-Definition51 3h ago

Watching those get taken apart and serviced on YouTube is just…amazing to watch.

I did some sailing on the Great Lakes and at night you could hear the rumbling of the lakers coming. Through the fiberglass hull. While asleep.

It lulled me into a false sense of security because I could always hear ships around me…until one day a cruise ship snuck up on me while I was reading and scared the crap out of me.

4

u/Flaky-Bar-6656 2h ago

I am so jealous of what you just described

5

u/teachthisdognewtrick 3h ago

With a 14 foot stroke and a 5 foot bore.

2

u/onetobeseen 3h ago

It would work like a diesel electric train? I have never been anywhere near a freighter etc

5

u/Knotical_MK6 2h ago

Not one turning that slow.

Slowspeed diesels like that are direct drive. Just a shaft out the flywheel straight to the prop. Engine stops and starts in the opposite direction to provide reverse.

2

u/Kiwifrooots 2h ago

Is that why they need harbour pilots and tugs?

2

u/rudenavigator 1h ago

The pilot is required for their local knowledge, not because of propulsion.

Tugs are usually a safety/make the job easier thing and heavily dependent on the port and size of vessel.

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2

u/Kern4lMustard 2h ago

We used to do a haunted house in an old blast furnace. The straight 6 in that is 2 stories high and twice as long.

2

u/mclobster 2h ago

zero horsepower, ALL the torque

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50

u/Real_Gap3480 4h ago

I used to work for a company that restored and finished massive valves for huge ships, kind of miss it.

I don't miss the sandblasting.

24

u/Monksdrunk 4h ago

while working in school towards my diesel career i had to settle for blast booth at the windmill tower plant. went from $22/hr to 13.5/hr overnights.

my blast hose blew out and sand blasted the entire outside of the booth. opposite side of me. only way to hold it was between your legs. would have blown my nuts off. i quit that week

10

u/PepsiColaRS 3h ago

Very, very likely similar in size. A C175-20 is ~27-28ft long but that is the entire genset, not just the engine. Approx 10.5ft wide as well, but again that's the whole genset and most of the width is the cooling stack. The engine and generator are only about 7.5ft wide.

A standard lowboy deck is 25-29ft long, 8.5ft wide. So this engine is about as wide as a C175-20 less the cooling stack, and potentially longer than the engine without attached generator.

Either way both are freaking huge. The biggest I've had the (dis)pleasure of working on is a measly C32 crammed as tight as you can imagine, sideways, in a cold mill. But I've gotten to spend a little bit of time around 797s touring and shadowing in quarries. Those puppies are BIG.

Here's an old Terex 33-15 (150T) for tax, regionally local heavy equipment museum purchased it for preservation a few years ago. Its generator is powered by a measly (by comparison) yet might 16V-149TI, the power plant being based on diesel electric locomotives. Unofficially 93 units produced and sold between 1971-75 as far as records have shown, this is one of few survivors.

3

u/catdieseltech87 3h ago

You haven't. There are no mining dump truck engines that size. Caterpillar's biggest truck, doesn't have l an engine half that size.

9

u/14point4kMODEM 4h ago

Massive generator for a data center in the basement, like 8 of them I think we're bigger than this... Much

4

u/KurtosisTheTortoise 4h ago

They used piston engines and not turbine? Just curious if they were backup or primary generators? System decisions are fascinating

3

u/14point4kMODEM 3h ago

I'm no mechanic just risk management but they looked just like this but bigger I feel. Probably 50 years old? I'm told they could run some crazy amount of power like for a few small cities. Can't really give the location but it's still being assessed.

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2

u/TraditionalPair8067 20m ago

It's not a contest 🤷‍♂️

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8

u/VelkaFrey 4h ago

Seen similar engines used on nat gas compressors

6

u/BreadfruitOk6160 4h ago

Isn’t that at “ship” level?

3

u/QuinceDaPence 4h ago

Tug boat size

2

u/Motor-Cranberry-1092 4h ago

Dude i straight up said this exact set of words before I clicked on the comments tab lol

Great minds

2

u/Sgt-Stadanko-69 4h ago

Generator??

10

u/fh3131 4h ago

No, this is a diesel engine. It may drive a generator in some applications, or just mechanically drive a propeller or driveshaft

6

u/CrotalusHorridus 4h ago

I’ve seen generators this big, also huge natural gas pipeline compressors, like Caterpillar 3616

This is an old tired boy

4

u/Several_Mousse_9485 4h ago

That's one big airplane

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94

u/FreezNGeezer 5h ago

That is going into my 1992 VW Golf....

59

u/nehrkling 4h ago

Don't worry, VW said it passes emissions tests.

18

u/Ancient_Jellyfish588 4h ago

Oh it'll pass. Don't ask any questions about how though.

6

u/antkeane 4h ago

Diesel prices though!

5

u/Null_98115 4h ago

I'm putting it in my Westy.

4

u/Wheatabix11 4h ago

it will fit nicely in my Triumph TR7

2

u/criggie_ 3h ago

I suspect your TR7 would fit nicelly in the oil pan of this thing. Heck your engine is probably smaller than one of the cylinders on this.

2

u/ymmotvomit 3h ago

Well it is the shape of things to come.

4

u/RearAdmirer 4h ago

Probably burns less oil than my EA888.

3

u/drossen 4h ago

You golf is going into that engine

2

u/khauser24 3h ago

With today's diesel price?!

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48

u/Specialist-Two2068 5h ago edited 1h ago

Either a railroad locomotive or maritime engine, but more likely for a ship or maritime use of some kind.

This looks to be some flavor of old ALCO (American Locomotive Company) engine, possibly a 251 or variant thereof. It looks to have 18 cylinders arranged in a V-pattern.

There was a North American version of the 251 with a V-18 configuration in the form of the 251F, which was used in the Canadian-built MLW M-640 diesel locomotives. The V-18 version was also used in the Famous class US Coast Guard medium-endurance cutter ships. This same series of engines were also used as stationary gensets for emergency/backup power generation.

(This is the 16-cylinder version, viewed from the opposite end and side as your picture, but the actual engine series and the basic design are the same)

15

u/ElectricPenguin6712 4h ago

This is an ALCO engine. I worked on a smaller version in the Coast Guard on the Reliance class cutters(210s). White shells on the side were called turtle backs and right below are the explosion covers to mitigate damage from a crankcase explosion.

5

u/mbash013 2h ago

Came here to say that! 270 main prop guy here. 18 cylinder ALCO 251. Recognized those turtle backs and jacket water risers immediately.   ALCO stands for Always Leaking Crude Oil. 

2

u/Specialist-Two2068 1h ago

Their railroad counterparts weren't much better in terms of cleanliness. ALCO locomotives tended to smoke really bad (in comparison to their EMD and GE brethren) mostly due to turbo lag and running the mixture just a little too rich.

2

u/silber196 2h ago

My old man was an electronics chief on the Steadfast in the late 90s— always had an appreciation for the Reliance class since. Which canoe did you call your own?

As a later squid and merchant mariner, and obviously from a uscg family— many thanks to all the coasties out there.

2

u/The_Last_W0rd 2h ago

i was gona say it looks like 9 visible cylinders on the side shown in the photo so it may in fact be a V-18.

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15

u/NutshellOfChaos 5h ago

18 cylinder diesel engine. Could be for a locomotive, ship, generator, or pumping station.

2

u/TheVorch 4h ago

Modern locomotives are all V-16s, I think, so more likely a generator or a boat engine.

3

u/Tight_Emu1777 4h ago

Modern locomotives are V-12s, actually. Wabtec is the largest producer of mainline locomotives in the US and they haven’t produced a locomotive with a V-16 in over 20 years. All ES44 and ET44 variants are V-12s. In the US, at least.

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11

u/Mindes13 5h ago

New motor for the Miata

19

u/Quirky_Operation2885 5h ago

Engine for a reasonably sized boat

10

u/Malefectra 4h ago

Nah, at that point it's a small ship.

4

u/Quirky_Operation2885 4h ago

"reasonably sized."

Definitely not cargo ish draft, but bigger than a weekend cruiser.

2

u/Southern-Ad-1294 4h ago

It depends on how many engines they have

9

u/Natoochtoniket 5h ago

Engine for a reasonably sized big boat

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8

u/Fetidville 4h ago

It looks to be an ALCO ship or rural powerplant engine.

8

u/FETT7022 4h ago

104liter (give or take a few) diesel engine for a train or boat.

4

u/frickin_darn 4h ago

Your mom’s “massager”

3

u/ghostman1846 3h ago

sad this was like 20 comments from the top. Come on people, we can do better.

5

u/pupperdogger 4h ago

At first I thought it was a GE or maybe an old Waukesha diesel, but they didn’t build an 18 cylinder. Then I thought Colt Pielstick. Ultimately I have settled on ALCO 18-251 prime mover. If that’s what it is it’s for starting power application best I can tell. The 18 cylinder is an odd one for large medium speed diesels. Thanks for the excuse to rabbit hole for a while. Again, I’m not certain but I have it the old college try.

3

u/Gamer_0627 4h ago

Spot on. Still have 4 of these in service at a local plant for backup power. Even still supported by Fairbanks Morse (FMD).

16

u/StickFew4407 5h ago

It's a semi truck with a flatbed trailer

11

u/Token-Gringo 5h ago

Oh, yeah. Now I see it. What a good eye.

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4

u/ImissDigg_jk 4h ago

Looks like the motor to OP's mom's vibrator.

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14

u/DunkeyColdMedina 5h ago

That is a big fuck all ICE.

18

u/DunkeyColdMedina 5h ago

Internal Combustion Engines. FFS read a book.

12

u/EmployerDesperate581 4h ago

Funny you mention FFS. I saw a post earlier about Facial Feminization Surgery.

2

u/Suspicious_Aspect_53 4h ago

I know. It's a joke FFS. 

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7

u/Wonderful-Hunter686 5h ago

Boat, train, or massive quarry dump truck engine. Someone familiar with this engine will pop in and give you the exact model at some point.

3

u/Vivid-Iron-6813 5h ago

It is a diesel locomotive Pusher motor also used in Marine ships

3

u/frenchmans-hole 4h ago

It’s a steam reclamation engine. We got warnings that a few of these would be transported through Maine and would be closing roads and such.

3

u/RoosterzRevenge 4h ago

Marine engine being pulled by a sweet ass Peterbilt

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3

u/iBUYbrokenSUBARUS 4h ago

Bigass motor

3

u/tipareth1978 4h ago

Big engine, for a ship or a crane or something

3

u/Libby_785 4h ago

It sure matches the picture of an ALCO 18-251 diesel engine. This was most likely a marine application, possibly stationary power plant. The largest used in a diesel locomotive was the 16-251. Compare the picture from the OP with the one pictured in Wikipedia.

https://en.wikipedia.org/wiki/V18_engine

2

u/Status_Barnacle1735 5h ago

In a Australia we call that a big donk

2

u/asbestosorangutan 4h ago

Industrial backup power diesel engine. I’ve seen them in nuclear power plants. It could be from Pilgrim Nuclear Power Plant

2

u/GearhedMG 4h ago

Obligatory: Starter engine for your mom's vibrator.

2

u/Canadianguy2044 4h ago

Locomotive prime mover

2

u/amy-schumer-tampon 4h ago

A big ass verry old engine, probably used in an electric generator or a boat

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2

u/NachoNinja19 4h ago

New Engine for my Honda civic

2

u/billyrevs300 4h ago

LS swap out lol

2

u/GeekDadIs50Plus 4h ago

Sleeper dragster.

2

u/d-unit24 4h ago

That's a big ass diesel engine of some sort

2

u/ConflictMaster3155 4h ago

The frame on the bottom suggests a it may be a locomotive engine and it’s a V18.

Super easy to find. It’s the Alco 18V-251. Literally the picture at the top of the “V18 Wikipedia page.

1 was used in a locomotive. 26 were used on 13 Famous Class USCG Cutters. A few more were used for power generation. Extremely rare compared to the V16 version of which more than 1000 were made, and a similar number of V12s.

2

u/EmptyRebuplic 4h ago

Thats a sweet truck

2

u/rxmp4ge 3h ago

Spoon engine for a Honda Civic. Yet to receive its T66 turbo, NOS or MoTeC system exhaust.

3

u/Different-Fan-6991 3h ago

Honda Civilization

3

u/Bishopjones2112 4h ago

V18 cruise diesel for a decent sized ship. Not a massive boat and not small pleasure boat. Probably a few thousand tonnes

2

u/Leading-Loss-986 4h ago

Google thinks it is an ALCO 251 series v-18 diesel engine for marine or land-based power generation or in big train locomotives. Someone here may know more.

1

u/jayron32 5h ago

Big ass diesel engine

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u/[deleted] 5h ago

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u/AlfredoCheeseSauce 5h ago

it's a picture of a dashboard and a truck hauling a giant motor

1

u/HomeauxPomeaux 5h ago

Shitrotator

1

u/Tough_Yard7088 5h ago

The one I worked with was an Ingersol industrial motor.. it ran on natural gas, and worked as a gas compressor..

1

u/AdElegant3851 4h ago

Toaster?

1

u/ZebeDIEah 4h ago

R/HRSPRS

1

u/TheDean242 4h ago

Hellcat

1

u/LefT-NYC 4h ago

It's exactly what it looks like! 🙄

1

u/Southern-Ad4016 4h ago

A really big engine for a ship

1

u/Mental-Chapter6523 4h ago

Put this bad boy in a stadium and you can flush all the toilets at once.

1

u/UnFound94 4h ago

Big engine. No, it wont fit in your civic.

1

u/Gorrmb69 4h ago

Kinda looks like a locomotive engine.

1

u/Volchiefretired 4h ago

New engine for Vespa

1

u/Ferowin 4h ago

It looks similar to a tugboat engine I saw years ago.

1

u/Grouchy_Afternoon924 4h ago

Diesel electric submarine motor?

1

u/SilentWatcher83228 4h ago

My boat needs one of its backup generator overhauled

1

u/DirtyMitten-n-sniffi 4h ago

That’s going in my mustang , bolts right up to my trans too

1

u/CaPnK56 4h ago

It is a ships engine, maybe a large tug?

1

u/ProteusRift 4h ago

Ship's diesel on a truck bed behind a truck on a road going somewhere. There are also woofed hils in the background and overcast skies. Ask rainbolt for a geo in Mass.

The hood and dash of a dark car, likely a truck or SUV are in the foreground

1

u/Heeey_Hermano 4h ago

Possibly the diesel engine for a large generator?

1

u/Remarkable-Quail-813 4h ago

The two biggest I've ever worked with were a Fairbanks Morse op 10, and a humongous 12 cylinder Alco

1

u/kuntrycid 4h ago

It could be from a generator

1

u/Vfrnut 4h ago

Eh . A small engine. Not really with second look .

The pic below is of a BIG engine .. where people WALK thought it for inspection it has LADDERS built inside it . The head and block off at the moment.

1

u/rexfaktor 4h ago

This would be difficult to replace with an electrical option due to our current battery technology.

1

u/fieldcar321 4h ago

Locomotive engine

1

u/Bifferer 4h ago

1964 VW Beetle engine.

1

u/Gold-Man33 4h ago

Ship engine

1

u/Cobrachimkin 4h ago

That’s one of the Spoon engines that they were overnighting from Japan.

1

u/GMH2045-18 4h ago

I work for a diesel engine manufacturing company, and the plant I currently work at makes 95 liters engines used in locomotives as well generators.

1

u/ViniusInvictus 4h ago

Ship Engine, or Shenzhen.

1

u/Accomplished-Idea358 4h ago

I just watched Mr Hewes start this motor in a video about 15 min ago. Its a crazy beast.

1

u/DerrikeCope 4h ago

Is that a Hemi? /s

1

u/RevolutionaryBrain75 4h ago

Something belonging on r/hrsprs.

1

u/Renaissance_Rob 4h ago

20 cylinder turbocharged diesel engine.

1

u/StreetVagrant 4h ago

Idk but I think with slight modification it can fit inside of a Mazda Miata

1

u/Aware_Necessary8288 4h ago

Gotta be for a big ass boat or train

1

u/Hot_Shoe26 4h ago

That's one sweet pete

1

u/Kdiman 4h ago

Small block 35000000000000000

1

u/AdderallAndAudio 4h ago

It's a big ass 2 stroke. An EMD V16. Used in lots of Mississippi/Ohio/Illinois River tugboats.

1

u/Pretend-Design-7061 4h ago

Based on location, that's probably from a boat.

1

u/Hot_Time_8628 4h ago

Besides boats and trains, this unit could also be heading for a life as an emergency power generator. Seen a few on the hospital campuses.

1

u/DaveBowm 4h ago

V-18 diesel engine. Probably in the 4000 to 20000 hp range. Likely used on a ship.

1

u/Professional_Wind574 4h ago

Locomotive engine

1

u/dpjejj 4h ago

Engine engine number nine going down the county line…

1

u/Competitive-Dot-4264 4h ago

Generator block

1

u/Crewsy67 4h ago

That looks like an old train engine being repurposed likely into a marine vehicle.
You can see the frame has been torch cut to remove it from the train.

1

u/swervecityPhILM 4h ago

Ford’s new Infiniduty powerplant. The truck itself comes pre-lifted by 36 inches, the length of the truck is 37 feet and it has lights that round the entire chassis at eye level. Target consumer is suburban dads that employ landscapers and have soft, well manicured hands.

1

u/Primary-Floor8574 4h ago

Someone driving and using their phone at the same time to take a picture of a semi truck?

1

u/Be_Ferreal 4h ago

That is a data center boom digging up every part I can help build something… back up generator right there, buddy

1

u/ALCO251 4h ago

ALCO 251F, 18 cylinder specifically, a rare one.

1

u/[deleted] 4h ago

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u/drinkeroftherye 4h ago

Looks like an ALCO engine. Used on trains and ships.

1

u/3417- 3h ago

A replacement engine for my Prius?

1

u/Glockout387 3h ago

VW motor

1

u/EggRepresentative575 3h ago

A big friggin engine

1

u/Awleeks 3h ago

Will it fit in a Civic?

1

u/notepad987 3h ago

It is a electric semi with the backup diesel engine to keep the battery charged....

1

u/Byaaahhh 3h ago

That’s the new Hemi now that efficiency regulations have been rolled back

1

u/TheRealistoftheReal 3h ago

When a D battery isn’t enough

1

u/Ok_Net_5191 3h ago

Maybe an electrical power plant the engine?

1

u/Minimum-Web-6902 3h ago

Chevy bigger block!!

1

u/Apprehensive_Owl7186 3h ago

Yeah that’s my new engine I’m bouta throw in my Miata don’t worry about it brotha

1

u/UlfricStormcloak000 3h ago

Ship engine.

1

u/Kippykittens 3h ago

I think I saw a video of one of these running maybe this one it was nuts no I don’t have a link sorry

1

u/Free_Young4188 3h ago

Locomotive engine

1

u/T206V70R 3h ago

Weed Whacker.

1

u/MaximusManimal 3h ago

Whatever it is, I wanna hear it cold start...

1

u/czpo19mm 3h ago

Locomotive engine

1

u/funnyguy044 3h ago

Anyone whana help me rig this into a truck? Let's fly past everyone

1

u/Sea_Gold9283 3h ago

It might be a two-stroke. I dont see any charge air piping. I bet the intake is under those upper removable covers.

1

u/Alex0964 3h ago

engine

1

u/DecisionDelicious170 3h ago edited 3h ago

For a ship.

1

u/germanVFL 3h ago

7.3 power stroke

1

u/FirmAthlete162 3h ago

Auxiliary power

1

u/Mr_Maniac454 2h ago

God I love diesel engines

1

u/wrx_420 2h ago

That Peterbilt is gorgeous.

1

u/RealBigDickBrannigan 2h ago

That is what is known in the business as a "BFE". 😄

1

u/RegeneratingCan 2h ago

Locomotive engine, looks like an ALCo diesel

1

u/[deleted] 2h ago

Freighter engine..

1

u/darksamus8 2h ago

BIIIG engine, like for a container ship. Probably heavy fuel oil

1

u/zcpibm3 1h ago

Diesel Engine.

1

u/Extension-Rabbit3654 1h ago

A giant ass engine

1

u/Professional_Echo438 1h ago

schiffsdiesel

1

u/hoosarestillchamps 1h ago

Alco 251, worked on a couple tugs with these.

1

u/ThePumpkinFiend 1h ago

'72 Super Beetle engine.  Could be a '71

1

u/PsychoPeterNikleEatr 1h ago

Ferry engine.

1

u/HeziktZonderVan 1h ago

Overcompensation.

1

u/oopswrongbutton423 49m ago

Damn, your mom's back up generator for her vibrator is a bit overkill!!!!

1

u/nopower1981 28m ago

It's on wheels so it's obviously a residential portable generator