Diesel Engines aren't known for being quiet and smooth, but why is that? This video describes in detail why that is. You can help the channel for free by clicking the Amazon Affiliate Link: www.amazon.com/gp/product/B07...
I just thought of EE when I clicked on this video because he is doing a lot of explaining things, just like EE! He is for diesels, while EE is for gassers. lol
Being a diesel tech myself, I agree with almost everything you said but I can not believe you didnt touch on injectors, especially older mechanical type and HEUI system injectors. You can literally hear a T444E/DT466/Maxforce 7/9 coming from a mile away they are so loud lol. Injector clatter for days. Btw only reason maxforce 13s are so quiet is they spend more time in the shop getting EGR coolers changed then they do running ;) Great video as always
Have you ever worked on a pre-combustion 1693, 3406, or 3408? They were probably the noisiest CAT engines made. Sound like the cylinders are full of nuts and bolts, but that was just their nature. I love the sound.
I miss the destruction of the week! I hope you end up teaching diesel technology classes some day because you are fantastic at these videos. I’m guessing you’d have a really good classroom demeanor.
Gotta love those 3406e engines. I sometimes forget how loud them straight pipes are during winter though. Then I'm reminded when the weather warms up and got my window open and hit them Jakes
I have Pittsburgh power performance mufflers on both of my 3406e, love the sound of a straight piped diesel but I'd also like to be able to hear in 10 years lol
Love your videos Josh, you do a great job of making these topics accessible to everyone. I actually run a pump shop myself... One reason for the distinctive knock of older diesel engines is the ignition delay period. There is always a slight delay between the beginning of injection and the ignition of the fuel. Low cetane fuel or cold engine temps will increase this delay period. When ignition does occur, all the fuel injected up to that point ignites at once, which suddenly increases cylinder pressure and gives you that knock. Modern common rail diesels are quieter because they use pilot injection. Pilot injection works by injecting a very small amount of fuel early, waiting for it to ignite, then injecting the rest of the fuel. This allows for a more gradual pressure increase which decreases noise. It also reduces NOx emissions. Common rail injectors used on light duty diesels since the turn of the century (and recently appearing on some medium and heavy duty engines) run at 24,000 to 33,000 psi (Cummins XPI can hit 50,000 psi), which gives better atomization even at low engine speeds and allows for more efficient, quieter combustion.
Passengers always comment on the noise of the early 7.3 Powerstroke turbo-Diesel in my van. “That’s loud, is that the exhaust?” “No, it’s just a Diesel.”
Kudos to you my young brother. As a long time sub I've learned a great deal from your channel. I have a PowerStroke 7.3 L that I have rarely put a wrench on. I grew up working on my gas engine cars since pre OBDC 1, when everything was just vacuum hoses in the late 60's and 70's (remember carburetors distributors?) anyway I really appreciate when you show the internal components of a diesel engine and explain their operation.
The newer ones are much quieter as they have staged injection with the fuel pulse broken up into stages with pilot, combustion, and post combustion injector pulses. This dramatically reduces the noise since your not burning everything in one shot. Pretty amazing how quiet a ford 6.7 is at idle.
Great as always , have bled plenty of Diesel engines over the years due to air in the fuel system Howe do modern engines handle this problem thanks for sharing 👍
Electro Motive Diesel (EMD), that power EMD Locomotives is a 2 cycle Roots blown or turbocharged. Talk about a sewing machine smooth but tremendous power. Up to 567, 645 or 710 c.i.d. per cylinder ×16. Anywhere from 1500 to 4300 h.p.
Great video Josh! Question, isn’t the injectors a large source of the diesel clatter as well? I can’t vouch for cat rocker actuated injectors but I’ve heard 60 series and HEUI injectors on a test bench and they clatter loud enough it sounds like the engine they go in is running. Just curious, let me know what you think. Keep up the good videos!
I am driving a 2001 Peugeot 306 hdi. Thats a french 2l inline 4 wagon with 90hp since they put diesel engines into almost everything over here in europe. If you open the hood the injector chatter is ridiculously loud but I like it and the car gets close to 55mpg.
Great informative video! I get all kinds of weird looks from kids or other young folks whenever i am out and about lol. I can see them just wondering, “why is that thing so loud”. Haha
another thing is that they usually have MUCH higher displacement compared to automotive gas engines. Especially on big semi trucks, they usually are 12L+. More displacement means more air and fuel which means bigger boom
i finally found out what's that loud noise and quiets down after a while sounds like the engine has a kid throwing tantrum in it. It was the radiator fan.
What size fittings and hose do I need to make oil pressure gauge tester, I already have the cat gauge but dont know what size on fittings. any input thank you great videos.
Block design can have some to do with it. Deutz air cooled diesel are individual jugs that are like your lawn mower engine just bigger and beefed up. And because there are no water jugs that absorb a lot of the noise, they are easily heard a mile away under load. I actually have a little bit of hearing loss from irrigation pumps powered by these engines. I should add that our ih 766 does have some noise from the injector pump and that is what you mainly hear at idle.
Great entertainment as usual. Missed seeing "blown up stuff" at the end of the video like you've had in previous vids. What's happening, nothing blown up lately in the Cat shop? haha. You dont have to be a "great illustrator" all you have to do is know-your-stuff and the speaking will do the writing on the board for you and nobody cares about squiggly lines - people are buying you, not the illustrations. On my own channel, im soon starting content talking about CVT's in a style as a blend of what you do "sitting in front of camera" and doing a "white board" like "EE Jason". Keep up the great work there Bud.
Don't the mufflers also provide some back pressure? In some engines they do...and if you don't run them with a muffler, you can damage the engine. Is this true on diesels, too?
The newer common rail trucks use multiple injections per combustion cycle. Where as the older trucks just use a single shot of fuel every combustion cycle with makes them much louder.
International Harvester mounted their diesel behind the grain bin on their combines, so it was always very quiet in the cab. Deere had their diesel right by the cab, so you had to deal with all their heat and noise.
Most of the noise comes from combustion, especially the older style diesels that don't have common rail injection. Modern diesels are pretty quiet.....with the injection system able to do multiple injection events in a cycle, the rattle can be controlled
So I remember when I was young,... (no comments please) aah... those were the days man...... oh ... where was I oh yea. When I was young.. right. When I was young sitting in the service truck with my dad day in and day out on my summer vacations from school, occasionally we would come across a truck that would sound like the engine was coming apart. I recall Mack's were the worst and they sounded like the pistons were swapping cylinders (as Dad put it). All the trash trucks were Mack in our area and when they came around at 7:00 in the Morning and woke me up I recall saying to myself why in Gods green earth doesn't someone tell all the trash collection companies to fix those trucks they are all broken There were many a day I contemplated calling the City and blasting them about the sinful noise. I mean am I the only one this bothers? Dad assured me that this was a Normal noise and a call to the local Mayor Police and State department would only serve to create a problem for me. AKA him, And as time went on they got quieter .. almost Silent. like today I strain the hear them in my new town.. its like.. Whoa wait. How-come the trash containers are empty. Umm yea its either "SOMEONE STOLE MY TRASH!!! WHY DID I THROW THAT STUFF OUT. IT MUST HAVE BEEN AWESOME STUFF WITH REAL VALUE!!'", or wow that 15 ton truck with a 375 HP 2000 lbs of torque, engine behemoth, garbage truck somehow snuck up to my house and carted away my crap i didn't want and perhaps no one else did either (which made more sense as well as made me cancel my ebay trash sellers account.. In conclusion, It made me feel different.... Today's technology with Piezo electric injectors and Smart Computer controlled Multi Pulse Injectors Have changed the field of diesel engines. The Turbos and engine sealing technologies add to the pluses. The old ones were better some say but they are just different. The old beasts were Simpler, Ran forever without complaint with little more than oil and filter changes. Sure the new one are way more fuel efficient, and quieter and better for us and the environment. Believe it or not, My Nephew said I was causing physical harm to the neighbors and polluting the environment with my 1988 Ford Van with the International Diesel. Of course it passed the emissions testing but he convinced some people to comprise a investigation into it. I have to commend his self serving determination ... Family... Anyway Great stuff here Josh.
Why are they sounds like connecting rods bearings knocking on the crankshaft? it is thrilling as ones can think of the engine is already damaged. I've listened the same sound on caterpillars, specially on a pail loader when it starts first time in the morning with cold weather. What causes that spooky noise? please, thank you. Wonderful explanation and videos.
I have a FIAT Tipo 1.9TD from 1993 and is very loud at idle (Sounds the same cold and hot) but when you are driving is a lot quiet, like gasoline quiet.
Main reason most diesels are louder is they are bigger, ever stood next to an aero engine of the internal combustion type even fitted with a silencer they are loud, another main area for noise emission on the older type of diesel with mechanical jerk type injection is the injector pipes and nozels expanding and contracting each time they are pressurised, probably half the total noise is from this area of the engine, one reason the common rail was developed. Then you have compression knock, combustion should be a fairly smooth process in itself with a steady flame front, no pre ignition in fact the problem with diesel is getting the fuel to start burning fast enough. Another thing is sound frequency in diesels it is much lower and this makes it sound louder to human ears.
I can't even hear the bus coming anymore where I live. The jakes are silent, the cooling fans on them are now electrical driven, exhausts are all muffled up, quieter transmissions. The times are definitely changing.
A turbo is exactly like a jet engine. It's essentially a centrifugal turbine engine with no combustion chamber. You can build your own jet engine if you just build a combustion chamber for it. I built one out of a drive shaft with a piece of exhaust pipe inside to act as a flame holder.
Ahh, the banging, hammering and clanking that that came out of the old slow turning 300 series marine Cats; the 343, 353, 379, 398 & 399 - pretty sure we paid an extra $10k just for the noise! No fans, no mufflers, all engine and turbo. Had a deck hand on one boat who was scared to go into the engine room because he was sure one of the mains was going to blow up in his face. We all laughed until one did, what a mess . . .
Nice video...you seem to be the one to ask about cats, I bought a 95 ford 9000 with a 3176 cat in it..can i put a Jake on that motor? Or just an exhaust brake....thanks in advance
2YG, 7LG, 9CK? Should be a 9CK. Engine Manufacturer: Caterpillar Engine: 3176B Engine Serial Number Prefix: 9CK Horsepower: All Engine Brake Model Number: 310A/3176 Engine Control System: Electronic 12 Base Kit: 148-7495 24V Dual Lead Base Kit: 148-7496 24 Single Lead Base Kit: N/A Engine Control Group Non-ABS: N/R Engine Control Group ABS: N/R Cab Control Group: 143-6652 *1 Clutch Switch Group: N/A Lash Setting: 0.025" Adjusting Tool: 149-6114 Lash Setting: 0.025" Tune-up Kit: 143-6626 Notes: Special switch with gold contact, May not be required if vehicle has control pre-installed; however, low resistance gold contact switches must be used with this engine.
my first truck with a cat sounded bad like the pistons were swapping cylinders right now I live in a 1968 gm pd4107 bus converted to a motor home Detroit two stroke every thing on it is gear drive blower alternator water pump even the original Ac system fan runs all the time engine temp controlled by shutter stat real happy that that the engine is 30 foot behind me cause dam that that old two stroke is noisy you and yours have a good day THE GRUMPY BUS
Of course the Maxxforce is so quiet...….its hard to make noise when your not able to run! But seriously, my 09 International was very quiet, but it was also gutless, broke down all the time (pyros, EGR, Nox sensors and DPF) and still wasn't legal to keep. Love my 2 new ISX15 trucks! Quiet enough, plenty of power and 3 years now with zero breakdowns.
My 1968 Kaiser-Jeep M35A2 deuce and a half has the Hercules 465-LDT-1C multi-fuel engine (22:1 compression ratio) & has the "whistler" turbo. There is about 6 feet of exhaust pipe past the turbo, and no muffler. You MUST wear hearing protection when driving it, or you will eventually go deaf.
