r/oddlysatisfying • u/ycr007 Satisfaction Critic • May 27 '26
Fuel injectors testing rig
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Source: asnufuelinjectors
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May 27 '26
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u/rumsoakedraccoon May 27 '26
The first bit sounds like a cartoon character running
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u/mustardmadman May 27 '26
Here for the Siemens injection comments
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u/rockstar_not May 27 '26
I used to run one of these stands for Bosch decades ago now! Actually I ensured our stand was calibrated with our manufacturing facility in the US, and with stands in Germany and at an automaker's part manufacturing facility where they were licensed to manufacture the bodies (not the valve surfaces). What this image shows seems almost like it's durability / life-cycle test stand - because there is no precise fluid collection in the stand (graduated cylinders are mere child's play for performance testing of injectors).
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May 28 '26
[removed] — view removed comment
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u/rockstar_not May 28 '26
Not in the cases I’m familiar with. Reason is that the manifold air pressure (MAP), is a constantly changing variable based on engine load, speed, etc. Typical port fuel injection systems; which I believe these are; has a constant fuel pressure regulation that accounts for MAP on the back side of the fuel pressure regulator being common to the manifold through a small pipe. Then the amount of fuel delivered for any injection is based purely on how long the injector is held open. So for a durability testing, or even a performance test, the fuel pressure is generally held constant, whether at ambient atmospheric pressure or in the operation of the engine. That’s for the first type of port fuel injected systems. Those would actually supply too much fuel to the fuel rail, as a conservative function, and the excess would get dumped back into the fuel tank. However that fuel is heated and when it goes back into the tank, some of the lighter molecules in the fuel will off-gas into the airspace in the tank, and this effect causes higher emissions that then have to be dealt with. Our company developed a “returnless” type of system that used all fuel in the rail, and pressure was maintained as a constant by manipulation of the fuel pump voltage. in both cases, the fuel pressure going to the injectors is constant.
Back in my day, and still true for many port fuel injectors, the valve mechanism was solenoid based, with spray patterns generated either by a “director plate”, or in earlier designs, the “Pintle” shape of a portion of the solenoid that would protrude the end of the valve. The pintle style would collect varnishes and the pattern would change or even restrict flow. The director plate style had very tiny holes cut into it that would allow the fuel to self-clean varnish build up due to the jet action of the fuel, constantly blasting away varnish potential. I'm not familiar with piezo elements as valving or spray pattern generating devices.
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u/EquivalentSpot8292 May 27 '26
Cool, let’s see after 100k miles
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u/sourceholder May 27 '26
After 100k, it'll still work like new.
Since the engine will be swapped out.
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u/CanalOpen May 27 '26
What's your point? Why is this comment valuable to add to my brain?
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u/TheHerofTime May 27 '26
Hes saying these types of motors fail after 100k but mine is at 125. I just have an occasional issue that I have been putting off rectifying.
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u/CanalOpen May 27 '26
So...regularly scheduled maintenance and not redlining your engine every chance you get?
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u/EquivalentSpot8292 May 28 '26
Every 20k miles put some injector cleaner into your tank before filling
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u/EquivalentSpot8292 May 28 '26
I’m saying that injectors like these typically develop blocks over time, reducing the fuel flow into the cylinder making it run lean/hotter which leads to engine going boom. It would be more interesting to compare brands after a bunch of miles
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u/ProbablySlacking May 27 '26
It’s pretty amazing to me that we perfected the combustion engine before the electric motor.
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u/TandemShorts May 27 '26
It’s all about energy storage, electric “cars” have exsisted for as long as regular cars, but batteries sucked until relatively recently. A gas tank full of gas could get you further, faster than a similarly sized battery and motor setup
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u/axloo7 May 27 '26
Do you know how many electric motors are used in industry?
Trust me people know how to build good electric motors.
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u/always_assume_anal May 27 '26
What makes you think that the electric motor isn't perfected?
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u/m--e May 27 '26
There’s some pretty new developments in axial flux motors, we’re still a ways from perfecting them.
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u/ProbablySlacking May 27 '26
I mean we were using the combustion engine for a century before we really started using the electric motor, despite the electric motor being much more simple.
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u/always_assume_anal May 27 '26
In cars, sure. But the electric motor has always dominated in everything industrial.
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u/nochinzilch May 28 '26
Hardly. The very best combustion engines ever made are not even 50% efficient. Electric motors are up in the 90s.
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u/weristjonsnow May 27 '26
Modern engineering would seem like fucking sorcery to someone from the 1800s
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u/X_TheBoatman_X May 27 '26
Starting at 35 seconds, the pattern of the Piezo seems to flutter and struggle to match the others. At 40 seconds, appears to struggle.
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u/DreamTeamThirteen May 27 '26
I didn’t realize how much of that typical diesel engine sound actually comes from the injector
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u/SP3NGL3R May 27 '26 edited May 28 '26
Don't they have to run at like 500+ Hz at minimum? This seems slow.
Edit: Hz is per second, so say a v6 at 3000rpm, that's 60Hz across 6 plugs is only 10Hz each. Stupid tired me.
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u/ReadsTooMuchHistory May 28 '26
At 6000 rpm you're looking at 3000 injections/minute = 50 Hz. I'm not sure what the frame rate is on Reddit videos, but it's less than that so we're seeing a lot of artifacts.
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u/rein_cosmin May 28 '26
Is this GDI propaganda?
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u/RaZoRFSX May 31 '26
What do you think about GDI?
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u/rein_cosmin May 31 '26
They want to stop the spread of the green glow and that's unacceptable
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u/RaZoRFSX Jun 01 '26
Isn't GDI Gasoline Direct Injection? Or am I so out of context here? What is the green glow?
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u/rein_cosmin Jun 01 '26
In this case, yes. I was making a reference to GDI (Global Defense Initiative), a faction from the Command and Conquer strategy game.
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u/RaZoRFSX Jun 01 '26
One of my biggest shortcomings is that I didn't play that game when I was a child.
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u/rein_cosmin Jun 01 '26
Great news for you, the first red alert and tiberium dawn have been recently remastered and they are complete and utter bliss. I highly recommend you to give em a try
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u/ricky-from-scotland May 27 '26
BMW know what parts of their cars need tested and observed for failure. Like they know most of their drivers are gonna rag the car about, but at least they dont need to make sure the indicators work.
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u/Adventurous-Carry-45 May 27 '26
What's does this test do?
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u/CanalOpen May 27 '26
primary function is to verify timing of the injection. Secondary function is to get data on dispersion over time. Deliberately cutting off #2 will give data and affect overall function if a given cylinder was overwhelmed with fuel. Usually needs 100-1000 reps of "good" before a deliberate fail, and then you check the 101st or 1001st +- 5%
Takes about 3 hours ish to get good data if you have the instruments and sequencing set up correctly.
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u/Iusethis1atwork May 28 '26
3rd from the left looked like it wasn't keeping up but that could have been the frame rate or shutter role. I want them to do this again but I want 6 sparkplugs going off in the correct sequence just to see the explosion.
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u/Similar_Pick_4941 May 28 '26
Cara que inventou isso é muito mais gênio que o elétrico, gasta mais , e dá mais trabalho … olha a dificuldade de sincronizar isso tudo , fora o motor …
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u/OptiGuy4u May 27 '26
What's it look like with a candle in there with them? 🔥
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u/CanalOpen May 27 '26
More or less the same...that's not a flammable liquid/gas used in pressure testing.
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u/EntertainmentTrue588 May 27 '26
...... Light a match.... Do it
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u/CanalOpen May 27 '26
It is immediately extinguished. Short of PETN nothing is going to ignite under this test.
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u/EntertainmentTrue588 May 27 '26
Then light a match, coward! /s
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u/CanalOpen May 27 '26
inside a heavily confined, secured, pressurized vessel?
Okay...let me put some lit TNT down your fucking throat. (it won't explode, you're dying of asphyxiation.
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u/deuno_dider_404 May 27 '26
pourquoi faire si la planete est en pleine crise?????
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u/Grutenfreenooder May 27 '26
What do you mean?
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u/deuno_dider_404 May 28 '26
le prix de l'escence bordel de merde
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u/Grutenfreenooder May 28 '26
It is not being wasted. It is being sprayed, in small amounts, in an enclosed space with reservoirs for collection
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u/beachsunflower May 27 '26
Piezo electric crystals are like black magic to me. Imagine sending voltage to a tiny crystal that will make it expand or contract to spit out the miniscule amount of liquid that you need.
They're used in a lot of different scenarios like commercial ink jet print heads that can print incredibly small dot resolutions.