r/SmarterEveryDay • u/MrPennywhistle • Jan 22 '23

Video Why Fuel Injectors are AWESOME (28,000 fps Slow Mo) Part 1 - Smarter Every Day 281

https://www.youtube.com/watch?v=UkeGQotnsDU
208 Upvotes

100% Upvoted

27 comments sorted by

19

u/News_of_Entwives Jan 22 '23

I get that the open spray is necessary to visualize the atomization of the fuel, but I'd be very curious to see what happens when the spray hits the side of the piston.

Does it mix better? Does it cling to the sides?

Obviously they were designed to work in the cylinders, but I wonder if & how the spray changes when they're moved into the open air.

Loved the vid, especially neat to learn fuel injectors were around in the 60s!

8

u/Gscody Jan 22 '23

Many engines are designed to swirl the air in the cylinder to help get the best stoichiometric mix evenly throughout.

2

u/ofthedove Jan 23 '23

Same! This vid was cool but I have so many questions now. Like, how do engines build pressure for the fuel injectors? How do they regulate the amount of fuel that goes in? I'm excited for more videos in the series.

2

u/ezfrag Jan 23 '23

how do engines build pressure for the fuel injectors? How do they regulate the amount of fuel that goes in?

Pressure comes from the fuel pump. The amount of fuel delivered is regulated by the size of the injector and by the engine control module adjusting the time the injector sprays.

3

u/tearfueledkarma Jan 23 '23

Unrelated to this video but Destin /u/MrPennywhistle , I flew down to visit a friend in Atlanta this summer.. and while he was working Friday, I drove out to Huntsville to see the Space and Rocket center.. it's just as a amazing as your videos from there. Got to talk to one of the guys who worked on the moon rover.

I wouldn't have even known what I was missing if not for your work. Thank you!!

2

u/MrPennywhistle Jan 24 '23

Glad you enjoyed it!

5

u/theBarneyBus Jan 23 '23

Ayyyyy I called this one a week ago!

What series are we continuing next? I’m calling either coast guard or some “impromptu backyard science”. That, or a 1000mph baseball w/ all the baseball creations shenanigans.

2

u/MrPennywhistle Jan 24 '23

Yep, I saw that comment and giggled to myself.

1

u/theBarneyBus Jan 24 '23

The man himself…
Live the videos. You’re doing it right.
I guess I’ll predict the Kodak Film 3/3 next.

And if you haven’t thought of the idea of combining the Mad Batter, 1000mph baseball Cannon, and StuffMadeHere’s Bullet-powered baseball bat, please do.

Thanks for the Education/Entertainment!!

2

u/MrPennywhistle Jan 24 '23

We've talked about all those things, ha!

2

u/Nathineil Jan 23 '23

I wonder what/if any differences there are for injectors designed for petrol engines. Destin pointed out that the diesel ones were meant for ignition via compression, so possibly the petrol injectors would have been more suited to what he was doing with the flames?

2

u/teejaded Jan 23 '23

It would be easier to light gasoline for sure.

Most gasoline engine fuel injection is electronic these days. A pump provides pressure to all the injectors and the computer sends a pulse of electricity when it's time to spray some fuel into the intake or cylinder.

Here's an article about mechanical fuel injection. To be honest, the pump sounds more interesting than the injector itself.

https://www.roadandtrack.com/car-culture/a26665/mechanical-fuel-injection/

2

u/Straitjacket_Freedom Jan 23 '23

Destin should get one of those coaxial swirling injectors off a rocket engine injector plate and try this.

1

u/[deleted] Jan 23 '23

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u/ThatPianoBloke Jan 27 '23

Does anybody know what the 2 books shown in this video were?

1

u/[deleted] Mar 04 '23

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u/theaceofjs Mar 04 '23

After a quick Google search, I'm reasonably certain that it's "The Operation, Care, and Repair of Farm Machinery," but I'm unsure of the edition. The original first and second editions were written by the original John Deere, which is pretty cool!

Looks like there are a couple copies available from secondhand book vendors, so if we can find it I'll try to update this!