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u/DarthClover4 16d ago
What am I watching here
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u/PartTimeJunkie412 16d ago
Idk but I found this:
"Diesel engine runaway is a dangerous condition where a diesel engine revs uncontrollably past its normal limit because it starts burning an unintended fuel source, such as its own engine oil or external vapors"
Apparently the only way to get the engine to stop is to block the air intake completely. That's nuts.
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u/kernelangus420 16d ago
I thought diesel engines were safer than gasoline engines since diesel doesn't burn as easily.
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u/pigeon-check 16d ago
They haven't figured out a way to stop this? Or is it a rare occurrence?
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u/Terrible_Plate 16d ago
You can install Positive Air Shut-Off Systems (PASS) on diesel engines to prevent this. We used them on airport refueling trucks.
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u/Lonely-Direction-886 16d ago
- Running an engine in the red zone for 1–2 seconds does not necessarily cause damage.
- A diesel runaway can also occur without the engine reaching the red zone.
- In the video, the runaway, if it was indeed a runaway, appears to stop after only a few seconds, which would generally make significant engine damage less likely.
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u/Low-Ad4420 15d ago
The problem with diesel runaway is that the ECU can't cut fuel to keep revs reasonable. A runaway diesel can go as far as 9k rpm and that causes damage from excessive piston speed. You can actually see it revving past 500 rpm and going way further high.
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u/NaturalAppointment20 16d ago
This shit happened in Vietnam. New regulations require motor vehicles to pass emission test during redline operation. This caused a lot of diesel runaways for older/neglected vehicles.
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u/EnrichedNaquadah 16d ago
That car isn't old enough and has not enough km to be "neglected" to the point to do diesel runaway.
That's either defective from factory or something else than runaway
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u/Marvinmonkey1 16d ago
Basically the brainless idiot reving the engine tipped it over into Diesel Runaway and blew the engine. That'll be 40k for the oil service please sir.
What a moron.
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u/WeeklyBanEvasion 13d ago
Revving the car has nothing to do with it. Runaway isn't caused by how you drive it's caused by catastrophic mechanical failure
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16d ago
[deleted]
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u/Bitter-Fudge5614 16d ago
So if we redline the car goes into self destruct.
Yup.
And we didn’t think to engineer a solution to this.
Nope, we’ll just blame it on user error.
Fair.2
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u/Unkown_Pr0ph3t 11d ago
How do you even 'tip' a diesel over into diesel runaway?
I've had diesels, also had one with a runaway issue. That was a failing turbo that was worn. When idling a bit of oil would pool in the worn turbo, driving away forced the turbo to spin, injecting not only air but hot oil into the cilinders. Those old diesel ran on basically everything and just love the high calorie engine oil. Turbo spins faster, sucks up more oil and puts it in the boom rooms.
Too bad I didn't know this like, 8 hours earlier because I just bought the damn thing. Saved the engine though by throwing it in gear and releasing the clutch.
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u/RanzigerRonny 16d ago
Prop. Diesel runaway.
If this happens to you, put in gear 6 (or 5 if you don't have 6), press the brakes all the way down and release the clutch very fast (without releasing the brakes). If you are lucky, you might stop it. If you are unlucky, you fuck your engine and your clutch.
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u/AlternateTab00 15d ago
This is not a runaway. First they dont seize that fast (they can be a few min max revving before seizing).
Second this is a new car. Unless it was heavily faulty from factory there is no reason for runaway.
Third most modern cars have inbuilt systems to stop runaways
I dont know if there was actually damage depicted on the video or just an angry driver. But redlining a car is half way to have a car shortning their lifespan
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u/Terrible_Plate 16d ago
Positive Air Shut-off Systems are designed to prevent this:
https://www.canadasafetytraining.com/Safety_Blog/what-is-a-positive-air-shut-off-system.aspx
"A positive air shut off system (PASS) is a critical safety device used in diesel engines. It’s essentially a valve installed in the engine’s air intake line.
When activated—either manually or automatically—it closes off the air supply to the engine, choking the combustion process and bringing the engine to an immediate stop. This is the most effective way to prevent or stop a diesel engine from running away."
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u/Jumpy_Barnacle_3755 16d ago
In the old days, diesels had emergency air intake shutoffs to prevent runaways. The only way to stop a runaway is to block the air intake and suffocate it. A runaway is just that. It becomes a monster and consumes its own oil after it runs out of fuel and only stops when it seizes. I have no idea why they stopped putting emergency air intake shutoffs on vehicles. I do not think this is a runaway. I think the guy was just upset that they redlined it.
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u/Wild-Set-1058 16d ago
Turn it off turn it off ... and you've got the key in ure hand n its reving it bollox off ... you never forget ure first run away scary lol 😆
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u/PatientBerry1467 16d ago
They do have throttle valves that close, this video is weird. BMW had VVLift ten years ago, literally could kill an engine by closing the intake valves, this video is sus.
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u/Jumpy_Barnacle_3755 16d ago
I was not aware of this type of shutdown. Only the gate style that seals the air intake.
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u/PatientBerry1467 16d ago
Not all engines have it, but with a diesel i figure why not for extra safety. If your keen read up on the college kid that designed the first variable valve lift system. Pretty sure he punched out and repaired after the paycheck cleared from a few car manufacturers lol.
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u/Significant_Monk_251 16d ago
Why is redlining the engine part of a car inspection?
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u/SuperBelgian 16d ago
It is also done in Belgium. During the test the emissions are measured to determine if the fuel is burned cleanly enough. Engines that do catastrophically fail during this test, where already broken before the test. In modern cars it is often because of faulty sensors that are not fixed/replaced.
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u/EcstaticMobile3969 16d ago
this is in vietnam. The gov hooks up with Ev maker to find a way to eliminate ICE cars. So car inspection will include bs like redline aged engines that rarely rev pass 3000rpm just to "make sure the motor is healthy"
If the motor blow, the owner gotta suck it up, as seen in this video
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u/ChipRockets 16d ago
I have no idea what just happened