As a truck mechanic I worked on quite a few of these engines in the 70s, didnt matter if you were going 2 mph or a hundred they literall screamed and the oil oh the oil they leaked like a sieve. good memories

Please tell me im not the only one who notices how clean Lenny runs... no smoke at all.

I don't know what's more impressive .. the sound of it and the way it runs or the fact that there's no smoke at all

I drove an Attack Troop Carrier with two Grey Marine 671's in Vietnam. It was a converted WWII LCM where you had to handle 25 tons deftly using two D-handle four-foot joysticks. I would twist for power on each engine and shift forward or backward for differential thrust. You could pivot the beast very gracefully when needed. Like coming into a pier against a strong current. Many a night sleeping next to them while the night watch drove going up rivers and canals through the jungle. The 671 sound and smell is still hammered into my night memories. I remember dreaming about home then waking up to the nightmare - just the opposite of normal life.

I had closed captions turned on....at idle it said, "Hmm......" At 2650 RPM it said, "(MUSIC)"...... How true it is!

Back in the mid 80's when I went to diesel school, the class of 12 split up in pairs and our class project was to completely tear down a 6-71, including the rack, reassemble it, and start it up on the stand. Since there was no oil or water in it, no exhaust system, and an open blower without the air box and trip plate, we were only suppose to run it just long enough to idle it and verify the rack was properly adjusted. About a minute. The teacher had made a steel plate with a handle welded to it to slam onto the blower in the event of a run-away to shut the air off. We got to the last motor when the shop phone ran and the teacher handed the plate to another student so he could answer it. The last two guys started their motor and the rack immediately went to full fuel. The guy with the plate dropped it and ran like he'd been shot! That motor ran for about 45 seconds before before we could get it shut down! You should hear what a 6-71 sounds like turning about 5 grand with no exhaust and an open blower! Yes, we all went home with stained underwear!

I can remember as a kid sitting on the engine hatch of fishing boat going out San Francisco bay with screaming Jimmy, at full scream. 40 years ago still can hear it today.

This engine's will run for ever Dependable and simple to work No computer B.S or plastic need it Thanks for posting this video God bless You all

Drove one of those screamers with a 13 speed for 12 years starting in 1971 . Hauled gasoline around western Pennsylvania , Ohio and NY. Exhaust had a 90 degree elbow just outside the passenger window and what a roar , loved it !!!

Could listen all day long I don’t think it’s possible to be tired of the sound

Military used to have a lot of them, old pre 70s HET had 16V92 with twin straight pipes, that's why I still listen to them today.

Best diesel ever made. Used in everything from WW2 landing craft to bulldozers, fishing boats, fire trucks and farm tractors. Won our war, grew and transported our food, fought our fires, built our infrastructure, caight our fish, you name it. That sweet GM music was the soundtrack to our cityscapes, waterfronts and construction sites.

Growing up in Ca.in the 60's, we lived near the Cajon Pass and would hear those trucks going up and down the pass day and night. The sounds were incredible.

Growing up in the 1970's I used to hear that wonderful screaming Jimmy sound all the time down the highway. Thanks for bringing back good memories, loved it!

I had twin 8v53 Detroit's in my Chris craft. It redlined at 2850. I ran them at 2650 when I was out on the water. Had to wear ear muffs when I went down in the engine room at those rpms. Incredible.

Growing up in Boston in the 80s all the public transportation busses sounded exactly like that. Man that sound brings back memories.

Nothing sounds Sexier than a general motors built detroit 2 stroke

No engine, gas or diesel, will ever sound as wonderful as a properly tuned Detroit Diesel. I used to have a 6V92T in an Eagle and I loved going through tunnels or overpasses at 70 mph just to hear it run. Honestly I don’t think that the 6V92T was their best sounding engine but it was still sweet.

Detroit diesels make beautiful music 👍🏻👍🏻👍🏻

Even at low idle I find myself grinnin' ear to ear! Thanks for the memories! :-)

Love that sound!!! And I see literally zero smoke!

It is clearly evident that Lenny is owned by a master 2 stroke diesel mechanic!

Back in the 70’s I used to drive an International Cab-over with an 8-71 under the Dog house right next to me. No wonder I’m almost deaf.

Without exception this is my favourite engine of all time. worked on these from 1980 till 1997 in marine versions from 3 53;s up to 16v149's love em all, great power, great engines

You sir are totally unsupervised where’s Kelly

Drove a fire engine that had one. Could hear it coming a mile away. Then hit the jakes brake!

The 6/71 is my favorite Detroit Diesel, it’s music to my ears especially when going through the gears.

You know, I never tire of hearing these engines. This one sounds especially sweet ...

That is the best sounding running 6-71 straight blower I've heard in a long time. Used to be a popular logging truck engine back in the day. Really wicked with a Jake head, but necessary for mountains logging truck. 8V71 twin turbo'd has a real high pitched scream on a hard pull

Loved the sounds of those busses when I was growing up, this really brings back memories! thanks for showing this and letting us hear it sing!

First semi I drove, a Brockway. Long nose screaming jimmy. Loaded 40 ft. Trailer 60+ mph. Headwing maybe 50mph. Great trucks. Originals had wooden floors. Man brings back memories. 85 now missin. Last tractor 9670 Int. Cabover. God bless.🐻

Oh you bring back memories, when many years ago we used to service one of theses engines in a garage I worked at when I was 16. I liked it then and I still like it!

Lenny just needs some turbo whistle to complete the orchestra. xD

SING IT, LENNY! PLAY US THE SONG OF YOUR PEOPLE!

In the 1970’s Detroit Diesel told mechanics oil pressure was adequate at 1 lbs. pressure to every 100 RPM’s . That always stuck in my memory . When tuned correctly the initial start the engine would lope 3 times and then smooth out .

The most beautiful engine sound all over the world! I love this! Thanks a lot!

Most beautiful sound in the world

Now you're just showing off! Love it.

My Dad had possibly the most stroked out Detroit ever. It was a 671 with 70 injectors turned to 2650. It would make a 290 Cummins cry.

That thing is tuned to perfection! Amazing!!!

Oh man, that is awesome. Ever since i was a kid, i have always loved the way a two cycle Detroit sounds, especially the 671. Great American engine..

Still gives me goosebumps...Thrilling sound of a roaring Jimmy!

I've always loved the "busy" sound of a Jimmy! Great engine. Nice video.

Tuned to perfection, so clean burning.

All I know that Screaming Jimmy sounds GOOD, ESPECIALLY when going down the highway. Great short video ✌🏽

Gave me flashbacks to watching maximum overdrive when I was a kid

Man that engine sounds great, very neat idle, clean exhaust revs up smooth without hesitation, nice toy.

Brings back memories of my dad's gmc wrecker. Loved to ride in it on a service call. Detroit's are awesome!

Love the sound of Lenny never missing a beat!!!

Superb! 6-71 already my favourite engine sound ever but at 2650rpm and burning that cleanly, wow. Thanks for sharing 😊

It's working with its pistons all working together, so it's so smooth. That diesel lasts so long partly because of it's smoothness in all power pulses. A masterpiece.

I used to work in the oil field. 671’ were on the Rigs. Their were left and right hand engines. They’d bolt two of them together. Had three sets or six engines with long strait pipes coming out. Those pipes were aimed highly at the mud tanks where you had to work sometimes. You talk about Loud ! They were all maxed out RPM’s. I’ve pulled many of them out when they’d blow up ! I still wish I could go back to those days !

Nice! Gotta love the sound of a screaming Detroit. I've driven lots of these in trucks throughout my career from a 6v53 through 8v92, mostly 8v71's. When I was young an old guy told me to slam my hand in the door and then drive it like you are mad at it. I found that if you keep them revved up and screaming they don't leak as much oil.

What a beautiful scream!!

I was born in 1949 in Los Angeles. I loved to hear the diesel trucks and busses growl through the gears. In the mid 1960's, my dad commuted to work in SF in Greyhound busses with the split rear windows. Earth movers would howl as they scooped up dirt. In Vietnam, the electricity was generated by six boxcar-sized two stroke diesels. The smell of diesel exhaust was everywhere. In the 1980's, I got to visit a geothermal drilling rig near Clear Lake, whose power was provided by four boxcar-sized diesel motors. Great memories. Thanks for sharing!

Lennie sure sounds good!! One of my favorite fire engines had a 671,one great power plant. Thanks for sharing!!

Absolute Beautiful gm music no other diesel comes close to a screamin jimmy

Best sounding 6cyl I’ve every heard

My hats off to you, that is the best running Detroit I have ever seen, and no smoke. I worked on these things for years, mostly marine engines!

I've driven these and loved the sounds!

They were the work horse of the artic . Had an old farmer for a mechanic and one time he had to change the engine out in a Nodwell at 30 below and he used a Bell 206 to lift the engine in and out .

Love the sound of a 2 stroke Detroit 👌

Making me homesick, l drove Freightliners out of San Diego Ca for 8 years, straight V12 Twin turbos V12 and Turbo V892 Millions of miles 1972 to 1980

What a wonderful collection of coaches! Thanks for posting!

Burning surprisingly clean. Love that sound!!👍🏻

Listening to the sweet music here in Ireland, beautiful!!

I started with my local transit service in the mid 90's. Most of the fleet (500) or so where GMC fishbowl. My favorite of all the buses that I have driven in the past 25 years. Very dependable and could go through all types of weather and road conditions. The company would get 30 to 40 years of service from these great machines. Parts were easy to find as companies all over the world had them and they were seen everywhere. New Flyer 20 to 25 years is what we get. I sure do miss driving them. Great memories. Thanks Scott.

You just cant beat that sound ! No 4 stroker ever sounded soo good!

...and drive them like you are pissed off! They love it!! Our older fleet of fire engines all had DD 2strokes, fire them up cold, run the piss out of them, then shut em down, sometimes 5-10 tomes a day. They were dead reliable, plenty of power, and fun to drive. Our newer stuff, all 4 stroke and electronic, takes 30 seconds just to start(the computer has to go through all of its checks) then you only get a percentage of its rated power until its fully warm(they are all 450+hp and slower then molasses) they are constantly in the shop getting repaired. No bueno! The life of any fire apparatus is a hard one and these newer engines aren’t designed for it. Hey are made for efficiency over the road in a semi, not to be abused!

OMG had the chills the whole time that Jimmy was a singin

At the 2650 rpm point that great sounding Detroit diesel engine sounded so smooth that it seemed as if it wasn't working that hard. I am 70 years old and I have always enjoyed the sound of a Detroit diesel engine. Great job.

This sounds absolutely awesome linked with no smoke on start up and no smoke on fast running this is amazing.

Sounds good at idle Love the sound of a healthy Detroit 2 stroke

I don’t have any words for how great that sounds

Love that sound. Grew up riding in trucks with that same engine. I also loved hearing it when my former boss would start his 1949 gm old look bus up to move it around the lot or to take it to the museum in Hershey for their spring fling.

That is one of the cleanest burning 6s I've seen. It sounds great!

That engine sounds smooth as butter! Absolutely awesome diesel-ness! I was a welfare kid in the 70's and whenever our clan had to travel, it was via Greyhound (or sometimes Trailways). The sound of those engines in the terminal was music.

I remember well as a kid hearing a cement mixer go by every day and thinking it had a turbine engine. It probably had turbocharged 8V-92!

Sounds epic! No smoke either, and without the need for DPF! Sign of a happy engine!

Unbelievable the memories that sound brings back !!

Brings back memories of the old GM city busses, sitting in back right next to the engine, waiting for the bus to leave, hearing the steady thrum of the engine idling.

LoL I never thought about every turn they fire, wow. Nice sound

I love to hear two of these together in the Euclid bulldozer this sound brings back childhood memories of the buses we rode downtown and back and other trucks and equipment sharing that beautiful sound as well

The most iconic sound ever...love it

One of the ships I worked on had a V16 Detroit gen set which COULD be started remotely but I always started it locally to hear it start up and run up to 1800 rpm, a fantastic sound. Being a two stroke it sounded like a 4 stroke at 3600, being a V16 it sounded like a straight eight at 7200, fantastic

Love it sounds great.

These 671’s were in the old Crown Coach school buses back in the day. Manual shift made it even better. Music to my ears as a driver every morning. Loved it.

A true mechanical symphony- thanks for sharing

And no soot coming out of the exhaust! That's nice!

I miss the sounds of the old fishbowls we had around here when I was a kid. Especially going up hills they just sounded awesome. These new NovaBus / NewFlyers they use now just aren't the same. Wish I had the $ to own a fishbowl bus love the style. Nothing beats the sound of a old 2 stroke Detroit!

I just drove my new to me...1955 GMC Buffalo home... she's a beauty. Total custom with no smoke and not one oil leak on the "Screamin Jimmy". I am a happy camper! You sir are the reason I bought it. Love all your vids!!!

came home from work and first thing i hear , what a wonderful sound ,, i'll never tire of listening to a detroit diesel screamin a 16V-71 sounds absolutely AMAZING ,,there is a farm i do some work for in central nebraska that has a huge semi trailer mounted generator ,,was formerly used to power a huge traveling carnival , it's a 1.2 megawatt portable generator powered by a 20V-71 ,it has 4 turbochargers

Or to put it another way, it sounds like a “normal” 4-stroke 6-cylinder gasoline or diesel running at 5,300 RPM. It’s no wonder newbies lug them. They’re already lugging when they sound normal to non-Detroit people. The county repaved our road three summers ago. They had a little roller with I believe a 4V71. They hit the governor at 7 am and held it there until 4 pm for two weeks. Had a straight pipe out the top, about two feet long. I like the Detroit sound at idle and under acceleration, but I never want to hear that again. The foreman had just had most of his teeth pulled, awaiting implants. He must have thought he’d been assigned to hell.

I was in court in the late 70s when the head of Thurston Motor Lines shop swore. Under oath that there is no such thing as "governor" on a Detroit engine.

Back in the early 90s I had my own international Harvester load star tandem dump truck, I think it was a 1200 series. It had a 6-71 Detroit, and 5 4 pair of transmissions. Every now and then the short piece of 4 inch galvanized exhaust flex pipe would rot out and it would be open exhaust. What a sound when fully loaded crossing over a bridge and coming down with the throttle backed off at 45 miles an hour! Sounded like the biggest pipe organ in the world on steroids! I love 6-71s

Great sound, no smoke. Simply Perfect 👍🏻

YES SIR, WE HAD A 671 IN THE 60 FOOT FISHING BOAT I WORKED ON WITH MY UNCLE AND MY GRANDAD! IT WOULD ONLY TURN UP 2200 RPM WIDE OPEN, IT WAS RUN 14 TO 16 HOURS A DAY 6 DAYS A WEEK AND NEVER MISSED A BEAT, IT WAS OVERHAULED NUMEROUS TIMES SLEVES PISTONS AND BEARING, AND THE CRANK WAS ORIGINAL NEVER REPLACED! IT WAS DEFINITELY A REAL WORK HORSE AND DEPENDABLE ENGINE!

That sound brings back memories for me! My dad drove for Trailways years ago. The Silver Eagles they operated were equipped with 8V71 Detroits. They had that same distinctive, awesome sound! Thanks for the memories. 😊

My dad worked for an oil rig moving company in the 50s &60s and had 4-71s in their IHs and thier Whites had 6-71s and to this day I can still hear them no other diesel had that sound love the 6v92 and 8v71 sound 👍

What a sweet sound! Popped right off, and no smoke!