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3D Printed Subaru WRX Engine – How Boxer Engines Work

September 9, 2019


Hello everyone and welcome, in this video We’re going to be talking about boxer engines. Now what you just heard was a FA20 engine out of the 2018 Subaru Wrx what we have in front of us here is an Ej 20 3D printed engine from a previous generation Subaru Wrx, both of them 2 liter boxer four-cylinder engines. Pretty cool what we’ve got going on here 3D printed all of the you know parts actually move as they would function you’ve got this intake manifold on top here which you can remove and then you can remove this portion of the engine block and see inside, so First let’s talk about what is a boxer engine, and you know it’s a flat engine which means that the pistons lay flat But what makes it distinct from other flat engines is that the pistons move in and out together, So they actually have different crank pins for each piston. Now if there was a single crank pin that both of these pistons shared that would be a 180-Degree V type engine So just a flat engine still but both of these cranks would be basically connected and so your two pistons would move back and forth like this. rather than out and in, out and In as this works right here. Now running through the different components here You can see the pistons and gold those are connected to a force the connecting rods which are in gray, That is then rotating this crankshaft, Which we have in yellow, Which will ultimately be sending power to the transmission through the flywheel which we have here in Dark Gray now You can see the intake valves they’re opening there in blue, and then the exhaust valves opening down there Those are red. On the front here We have the timing for the Camshaft So you’ve got the crank here with the timing and you’ve got a timing belt here Which is connected to these and then you can take off this valve cover here and see in blue We have our intake cam, and then in the exhaust cam here in Red, okay So now observing the four strokes on this engine. You’ve got intake compression power and the exhaust valves open, intake compression power Exhaust valves open, and you can see that on both sides here, so intake compression power exhaust Now as far as firing interval and firing order It’s going to fire one cylinder for every 180 degree rotation of the crankshaft And so you’ve got cylinders one two three and four and you’re firing order is going to be 1 3 2 4 so left side first then the right side and so looking in here intake compression power Power power power power power Power Ka-boom! *ka-boom that’s the technical term* ok so now a little bit of Inception we’ve got a subaru crosstrek on top of a Subaru Crosstrek Both in hyper blue with the FB-20 2-litre 4-cylinder boxer engine Moving across we have the eJ20 Old Generation Wrx engine on top of the Brand-new 2018 Fa20 Wrx. W as there any purpose in doing this? Not really no, but it looks cool and finally we’re gonna have a little bit more fun just matching the sound while I’m driving the new Wrx and match this sound to the revs of this engine Kind of looks cool to see it And hear it in combination of course the revs We’re looking at our much much slower than what’s actually going on in the engine, but neat to see none the less And a huge thank you to Eric Harold who sent me these 3D printed models to use in the videos They’re absolutely incredible and he actually has I’ll include some links in the video description But he has all of the files available for you to download if you own a 3D printer He did all of this with a pretty cheap You know $200 Chinese 3D printer And so you know pretty much any 3D printer out there is capable of doing this you wanted to make it really accessible for anyone To get into so I’ll include the links in the video description You can check that out possibly download the files and maybe build one of these on your own If you have any questions, or comments feel free to leave them below thanks for watching

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