Different Flat & Boxer Engine Configurations Explained | Flat-Twin to Flat-16

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The Engineers Post

The Engineers Post

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Different Flat & Boxer Engine Configurations Explained | Flat-Twin to Flat-16
A flat engine is also a horizontally opposed piston engine with cylinders on either side of a central crankshaft.
Most flat engines use a "boxer" configuration because the movement of the engine's pistons resembles the action of a boxer's fists in the horizontal plane. However, unlike the boxer's fists, which both moves in the same direction, half of the 'Boxer' engine's pistons move in the opposite direction. Boxer engines have low vibrations since they are the only common configuration with no unbalanced forces, regardless of the number of cylinders.
Flat engines have been used in aviation, motorcycle, and automobile applications. They are now less common in cars than straight engines and V engines (for engines with six or more cylinders). They are much more common in aircraft, where straight engines are a rarity, and V engines have almost vanished except in historic aircraft. And They have even replaced radial engines in many smaller installations.
The advantages of flat engines are a short length, low center of mass, and suitability for air cooling.
The most common flat-twin engines are:
Flat-twin engines: A flat-twin engine is a two-cylinder IC engine with the cylinders on opposite sides of the crankshaft, where both cylinders move inwards and outwards simultaneously.
Flat-4 engines: A four-cylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. Most flat-four engines are designed so that each pair of opposing pistons moves inwards and outwards simultaneously. The terms "flat-four" and "boxer-four" are often used synonymously.
Flat-6 engines: It is a six-cylinder piston engine with three cylinders on each side of a central crankshaft, where each pair of opposed cylinders moves inwards and outwards simultaneously.
Flat-8 engines: A flat-eight engine is an eight-cylinder piston engine with two banks of four inline cylinders, one on each side of a central crankshaft.
Flat-10 engines: A flat-ten engine is a ten-cylinder piston engine with five cylinders on each side of a central crankshaft.
Flat-12 engines: A flat-twelve engine is a twelve-cylinder piston engine with six cylinders on each side of a central crankshaft.
Flat-16 engines: A flat-sixteen engine is a sixteen-cylinder piston engine with eight cylinders on each side of a central crankshaft.
--- Time Stamp --
00:00 - Introduction to Flat-Engines
01:43 - Types of Flat-Engines
02:01 - Flat-Twin Engine
04:42 - Flat-Twin Engine in Motorcycles
06:45 - Flat-4 Engine
11:00 - Flat-6 Engine
14:09 - Flat-8 Engine
16:16 - Flat-10 Engine
17:07 - Flat-12 Engine
19:55 - Flat-16 Engine
21:00 - Wrap Up
All images used in this video are under a creative commons license.
Watch our video on 'V' Engines: • Different 'V' Engine C...
Watch video on 'W' Engines: • Different 'W' Engine C...
Watch the video on Inline Engines: • Different "Inline Engi...
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КОМЕНТАРІ: 110
@TheEngineersPost
@TheEngineersPost Рік тому
The Difference between the Flat and Boxer engines: A “flat” engine is one with a 180-degree cylinder angle (which often lays flat in the vehicle) and is also correctly referred to as a “horizontally-opposed” engine. A Boxer engine will feature an individual journal for each connecting rod, 180 degrees apart from one another. This allows each pair of opposing pistons to mirror each other’s movements.
@okami5029
@okami5029 Рік тому
who else watching this was like "hol up they got a flat 16?!"
@frygengrau823
@frygengrau823 Рік тому
Yeah actually, the flat 16 in the video is from the Porsche 917
@afoxwithahat7846
@afoxwithahat7846 Рік тому
I'm more amazed there's no flat 10 engines
@Keterius
@Keterius Рік тому
@@frygengrau823 No? The 917 had a flat 12
@Ramcharger85
@Ramcharger85 7 місяців тому
Hell yeah. 😂. Damn!
@Camdenlw
@Camdenlw 5 місяців тому
@@Keterius917/30 was tested with a flat 16
@1888fel
@1888fel Рік тому
The boxer 8 is now my favorite engine for the noise. I fell in love with the flat engine configuration when I bought my 2022 BRZ, it sounds really nice and it feels responsive
@TheEngineersPost
@TheEngineersPost Рік тому
Good choice!
@DarthVader-1701
@DarthVader-1701 8 місяців тому
The BRZ is basically an RX-7 but with a boxer instead of a rotary. Both Japanese cars but with German patented engines.
@Ramcharger85
@Ramcharger85 7 місяців тому
Flat engines sound freaking amazing. But never knew they made a flat 10, let alone 12 or 16. Freakin sweet 😊
@stevenmitchell6347
@stevenmitchell6347 Рік тому
Basically, the only real advantages of a V configuration with OHC and 6 or more cylinders over flat engines are width, oiling and, critically, aftermarket support. IMO as a retired Industrial Design Engineer and fabricator.
@chrisjarmain
@chrisjarmain 26 днів тому
I own an aircooled VW classic transporter. The noise is fantastic. Being its aircooled Is also unique from a mechanical perspective. So, whilst it may take up more space being a flat boxer, it is gained back with the lack of coolant components. It is a very simple engine. No timing chain or belt, and parts are VERY easily available. And because it is simple in design, it is open to vast modifications. Great for a motoring enthusiast. 😊
@dorianleclair7390
@dorianleclair7390 Рік тому
The WRX went to direct injection like the brz in 2015. And the exhaust manifold is no longer unequal length headers. So no longer has the boxer rumble. Supposedly more efficient going to equal length header.
@mattperjes6173
@mattperjes6173 Рік тому
equal length headers are 9 times out of 10 more efficient because they have far better exhaust scavenging properties. The boxer rumble from the EJ’s occur because of the irregular pulses of the exhaust causing turbulence in the manifold.
@georgewilkinson1068
@georgewilkinson1068 Рік тому
That "rumble" was made the old Subarus and the WRX a Subaru.
@Omega_SM
@Omega_SM Рік тому
@@georgewilkinson1068 better being more efficient and powerful or having the engine noise but not the innovation and the performance?
@elias1162
@elias1162 Рік тому
This is exactly what I'm looking for. Thanks a lot.
@TheEngineersPost
@TheEngineersPost Рік тому
Glad I could help!
@wrenchg3954
@wrenchg3954 Рік тому
THIS VIDEO IS FREAKING AMAZING! IVE HAD A RELATIONSHIP WITH THE FLAT-4 SINCE I WAS A PRE-TEEN. NATURALLY MY FIRST CAR WAS A 69 VW BEETLE. THE REST IS HISTORY. I WASNT AWARE OF THE ABUNDANCE OF INFORMATION RELATING TO THE FLAT DESIGN. THEY'VE ALWAYS SEEMED TO UNCOMMON AND OBSCURE. DATED OR RARE. DIDNT KNOW HOW OFTEN MANUFACTURERS WENT BACK TO THE DESIGN
@user-od5sl2jt7e
@user-od5sl2jt7e Рік тому
Rotax, Subaru, Porsche, Alfa Romeo- we love you)
@darylmorse
@darylmorse Рік тому
Interesting video. Quite a few mixed up photos, but otherwise pretty well done.
@thecelticprince4949
@thecelticprince4949 Рік тому
Big thumbs up for the mention of Richard Pierce's motor.
@mechguy8459
@mechguy8459 Рік тому
Comprehensive guide on Flat Engine. Love it 💗
@TheEngineersPost
@TheEngineersPost Рік тому
Glad you liked it!
@SmrazagilaniMohammadraza
@SmrazagilaniMohammadraza 8 місяців тому
which is more durable for 4 wheel drive 4 to 6 in line or 4 to 6 boxer engines
@tardstomper
@tardstomper 8 місяців тому
Subaru, damn you. I love those boxer style hamster wheels.
@Dustin1110
@Dustin1110 Рік тому
EZ30 and EZ36 were actually available until last generation Outback in North America
@raunakdas4224
@raunakdas4224 Рік тому
Informative 👏 kudos to the editor
@TheEngineersPost
@TheEngineersPost Рік тому
Glad you liked it
@vastosbicycles8325
@vastosbicycles8325 Рік тому
for the two cylinder boxer engine like the BMW motorcycle engine, crankcase free breath causes a lot of pumping loss.
@edonveil9887
@edonveil9887 Рік тому
Would make sense to make it 2 cycle.
@vastosbicycles8325
@vastosbicycles8325 Рік тому
@@edonveil9887 good point.
@hankyspanky1987
@hankyspanky1987 Рік тому
Not to be rude but can't forget that in Gran Turismo 3 A-SPEC and Gran Turismo 4, sSbaru Impreza, 22B, Impreza STI and Mitsubishi Lancer Evo, and prototype used the boxer engines for rally races, the Suzuki Escudo Pikes Peak Version used a I think boxer 6 engine...going off what I was taught and learned from those 2 racing games (the best ones that ever came out for Playstation 2)
@rocketbunnysti6344
@rocketbunnysti6344 Рік тому
I love gran turismo
@Ardonn
@Ardonn Рік тому
Wrong. Evo's use an inline-4 and the Suzuki Pikes Peak cars use a V6. Only cars in GT 3 and 4 using boxer engines are Subaru and RUF/Porsche. You didn't read right or remember wrong, all information in GT games are correct. They definitely didn't write anywhere that an Evo would use a flat-4, they are a japanese company and know what engines japanese auto makers use better than foreign manufacturers.
@oreisha9266
@oreisha9266 Рік тому
Hermoso sonido el 8 cilindros, que locura 😍
@danishh3819
@danishh3819 Рік тому
thank you sir for information ❤
@soundararajan2090
@soundararajan2090 Рік тому
Sir" really great explanation Master speaking . Thanks.
@ZepHoffman
@ZepHoffman Рік тому
beautiful video, thanks
@joelejo1587
@joelejo1587 Рік тому
Hello bro you kept you word. About engine. Nicely explain. Keep it up.
@TheEngineersPost
@TheEngineersPost Рік тому
Thanks for watching
@fadedsoul23
@fadedsoul23 Рік тому
So if I’m understanding this correctly, a flat engine (excluding 180 v engines) has pistons that don’t move simultaneously in pairs while a boxer does? Or is there more differences?
@JeffCurtisIflyHG
@JeffCurtisIflyHG Рік тому
The way the author used the terminology, all these engines are flat engines, with horizontally opposed pistons. They can either be boxer or 180 V. In a boxer, each pair of horizontally opposed pistons have their own crank pin and each pair moves out together and in together. In a 180 V, the pair of horizontally opposed pistons share a single crank pin, as one of the pistons moves in, the other moves out and visa versa. For 2, 4, 6, 8, and 10 cylinder flat engines the boxer configuration is the better choice as it results in lower vibration. The way to imagine this is think of these motors as two 1, 2, 3, 4, 5, and 6 cylinder inline motors bolted to each other in mirror image. A single cylinder motor has poor primary balance, but as the video describes, in a boxer twin, the changes in momentum of one piston is balanced by the opposite movement of the opposing piston. Because the pistons have to be offset from each other along the crank due to the need for separate crank pin there is a rocking couple along the shaft as described in the video. An inline twin has good primary balance but a strong rocking couple and an uneven firing order. In a boxer 4 the rocking couple is almost completely eliminated (not completely because cylinders on one side are offset from those on the other) and even firing. If a flat 4 were built as a 180 V the rocking couple would that of the inline twin times 2, very bad. An inline triple has perfect reciprocating plane balance, even firing, but a rocking motion along the crank shaft. In a boxer 6 the rocking is almost completely eliminated. If a flat 6 were built as a 180V it would have the same rocking motion as the inline 3 times 2, so not as bad as a 180 V 4 but still, the boxer 6 is much better. Once you move up to 8 cylinder flat motors, the balance issues change, but firing order becomes an issue. An inline 4 has perfect primary balance. So while a 180 V 8 would have perfect primary balance, it would have the same secondary balance issue as an inline 4 and the piston firing separation would still be 180 degrees (always 2 pistons for each stroke). In a boxer 8, the crankshaft pairs of throws are separated by 90 degrees from each other, instead of flat like an inline 4. Look at the animation at 14:20. This enables perfect secondary balance and 90 degree firing separation. The boxer is still the better choice. An inline 5 has perfect reciprocating plane balance but a rocking motion along the crankshaft similar to the inline 3 but not as bad. A boxer 10 would nearly eliminate the rocking motion so probably the better choice still but maybe less compelling. An inline 6 has perfect balance. This is the case where a 180 V engine is the better choice as the crankshaft is simpler and the engine is slightly shorter due to less offset between banks required as a result of sharing crank pins. The animation of the flat 12 is a 180 V engine. Wikipedia has a good article on Engine Balance for further details.
@nickayivor8432
@nickayivor8432 Рік тому
Thanks 👍 Happy Christmas 🎄
@user-ll8gp8cg2o
@user-ll8gp8cg2o Місяць тому
WOW appreciate you keep going love from pakistan
@getthewin1046
@getthewin1046 Рік тому
Very well explained 😘
@TheEngineersPost
@TheEngineersPost Рік тому
Thank you 🙂
@dramirez6493
@dramirez6493 Рік тому
11:02 Flat-6 Enigne what i win?? Haha nice video brother
@joshfoley8862
@joshfoley8862 Рік тому
Flat 4 in a 2006 Beetle? Rear drive? I wish.
@h60memo
@h60memo Рік тому
I guess being an engineer doesn't mean one knows the difference between an old beetle and a new beetle.
@alexjenner1108
@alexjenner1108 Рік тому
There are a lot of places where the video doesn't match the narration. For example 18:13 in 1964-65 the Ferrari 512 F1 with 1.5 L flat 12 ... meanwhile video switches to Ferrari with post 1990 high nose aero design.
@negeritopizza6103
@negeritopizza6103 9 місяців тому
Man i wish there was a modern 5+ litre boxer 8 engine
@adhammaher7717
@adhammaher7717 Рік тому
hey man please do a video of brake disks kinds
@MrTay675
@MrTay675 5 місяців тому
So realistic. Not really worth it until boxer 6 but once you do - yes you loose simplicity and weight compared to inline 6 but the lower weight center may give you a HUGE advantage looking for sports racing
@imrancapricorn78
@imrancapricorn78 Рік тому
you are the best one.
@trance9158
@trance9158 Рік тому
Tucker automobiles are awesome.
@narcissistinjurygiver2932
@narcissistinjurygiver2932 Рік тому
why not repl the cyl heads with crankshafts and make an opposed piston engine?
@nickt8972
@nickt8972 Рік тому
Correction...Ferrari 12 cyl. BOXER engine for F1 was (312) was introduced in 1970 in the 312B, not in 1975 in the 312T.
@user-sy1ed9ex5m
@user-sy1ed9ex5m Рік тому
It's flat, not boxer. It have common rod journals for the opposing pistons, and not separate as a true boxer.
@droppindeuces6981
@droppindeuces6981 Рік тому
Not really buying the 'too expensive to produce' argument (with regard to cylinder heads). Most V configurations require 2 heads as well. GM produced millions of examples of the Small Block V8.
@micromymario23
@micromymario23 Рік тому
In fact, producing two simpler things is not necessarily more expensive than producing only one but more complex.
@jasonmajere2165
@jasonmajere2165 Рік тому
It does for inline 4, and V are just easier to package into a car.
@mikestirewalt5193
@mikestirewalt5193 Рік тому
The Rotax you show has water-cooled heads. It's not purely an "air cooled engine".
@fexploder3281
@fexploder3281 Рік тому
12:08 I don't think this is a flat six engine so that's a flat 4.
@primaht6180
@primaht6180 Рік тому
Why does engine (crank) not rotate opposite direction when it starts?
@maxtuner5762
@maxtuner5762 11 місяців тому
Well When i crashed my 2004 subaru impreza The engine ended up beneath the car rather on my lap,so it's a win for me
@Lancair320
@Lancair320 Рік тому
The Rotax engine you showed for the aircraft flat 4 is both air and water cooled so you’re carrying heavy water. You would have been better off showing a Lycoming or Continental 4 cylinder. They’re purely air cooled.
@Thom101
@Thom101 Рік тому
rotary valves make boxer/flat configurations simpler and drops the part count (less to break). The Rotax brand is a good example.
@benedictgorospe5246
@benedictgorospe5246 Рік тому
This is the literal version of she purs like a kitten Edit: sorry i forgot to put the time 8:50
@NorthWay_no
@NorthWay_no 7 місяців тому
So basically the flat engine world is screaming for support from FreeValve to massively shrink the needed space. The explanation was that the boxer fires opposite sides 360 degrees apart,, but are there no configurations where both sides fire simultaneously?
@yourordinarygamer6071
@yourordinarygamer6071 Рік тому
Do the rotary engine please
@shariqhasan6220
@shariqhasan6220 Рік тому
Ok so based on the sound of the engine at 4:27, its safe to say all cars in Gran Turismo 1 had flat twin engines 😂😂😂
@chadkline4268
@chadkline4268 Рік тому
Best engines ever. BMW boxers: best bikes ever 😎👍
@karinaml.
@karinaml. Рік тому
Can you make a video for mitsubishi 4g93t /GSR engine family?
@TheEngineersPost
@TheEngineersPost Рік тому
I surely will do it.
@jaumebaldevell6137
@jaumebaldevell6137 Рік тому
Motor porsche 917 y ferrari motor V 180° no .boxer cateto
@EJ20555
@EJ20555 8 місяців тому
イエエエエエエエエエイイイ水平対向エンジンダアアアアアアアアアアア
@fabrisoto
@fabrisoto Рік тому
👏🏽👏🏽👏🏽👏🏽👏🏽👏🏽👏🏽
@robertmyatt9177
@robertmyatt9177 Рік тому
Er the Porsche 918 has 4 not 6 cylinders
@aadaminda5717
@aadaminda5717 Рік тому
❤️❤️❤️❤️❤️❤️❤️❤️❤️
@emilcsollak695
@emilcsollak695 Рік тому
V 180 ° pistons
@tomster7574
@tomster7574 Рік тому
The most common flat engines are every Number of cylinder engines? Except a single cylinder which can’t possibly be a boxer engine nor even flat.
@worldhello1234
@worldhello1234 Рік тому
@13:11 the 914/6 is 4 times as expensive as the VW flat 4 914 counterpart.
@marcotravaglini5747
@marcotravaglini5747 Рік тому
Interesting. But You've forgot to mention Lancia Flavia 1.5, 1,.8, and 2.0 liters flat Boxer fours. They were lightweight alloy engines developed in the '60s.
@jairepp
@jairepp Рік тому
you forgot to ad alfa romeo flat 4
@user-sy1ed9ex5m
@user-sy1ed9ex5m Рік тому
No mention of the Alfa Romeo boxer 4?
@denverbulsao8142
@denverbulsao8142 Рік тому
6 cylinder
@palashchoudhury5565
@palashchoudhury5565 5 місяців тому
180° Flat 4 OHV Engine
@khushbuparikh2825
@khushbuparikh2825 Рік тому
Made it water to work yo engine no required off fuel work for you khushbu girishchandra parikh
@khushbuparikh2825
@khushbuparikh2825 Рік тому
Made it air to work engine no required off fuel work for you khushbu girishchandra parikh
@martinb.770
@martinb.770 Рік тому
Rather superficial overview. The difference between V180° and why there are barely Boxers beyond 6 cyl, doesn't get analyzed, the 2 mio Alfas (Sud, 33, 145/146) don't even get mentioned, the Citroen GS get just hinted, the evolution of the beetle/356/911 engine not even scratched, let alone the aspect of turbos/biturbo in Boxers, but the same "pros" and "cons" repeated by a mecha voice for any cyl nr.
@pauloguerreiro6487
@pauloguerreiro6487 Рік тому
He didn't mention the Testarossa, which had a flat 12
@nathangrant104
@nathangrant104 Рік тому
Probably because Ferrari didn't use a true boxer engine in that car.
@bulentbuyuk
@bulentbuyuk Рік тому
14 silindir racig turbo
@darrenlyddieth5770
@darrenlyddieth5770 Рік тому
O Alpha Romeo, Alpha Romeo, wherefore art thou Alpha Romeo?
@h60memo
@h60memo Рік тому
That bothered me also
@almelling6699
@almelling6699 Рік тому
Those engines shown are Boxers not flat ,,,flat is the opposing pistons on the same crankpin. Different.
@rossbrumby1957
@rossbrumby1957 Рік тому
The flat 12 wasn't a boxer, as the demo video showed- same crankshaft as a V12.
@trance9158
@trance9158 Рік тому
Porsche rules!!!!
@javigar133
@javigar133 Рік тому
Two minutes in and I am impressed, he knows 2, 4, 6, 8, 10 lmao
@user-km3dj4bu3p
@user-km3dj4bu3p Рік тому
thank god for BRZ
@kitsune1594
@kitsune1594 Рік тому
Soviet T-64 tank uses 5 cilinder opposite 5TD engine.
@mmd8488
@mmd8488 Рік тому
ボクサーエンジンを語るなら、水平対向とⅤ型180度の違がいを理解して無いと駄目と思う。
@dudley7540
@dudley7540 Рік тому
No H-16?
@mikeglenn3333
@mikeglenn3333 Рік тому
Volkswagen lost a lawsuit in the 50's to Tatra over the air cooled engine designs
@wernerschwarz7596
@wernerschwarz7596 Рік тому
The Porsche 718 GTS does not have a flat-6. It hast a flat-4. so sad
@elgronch8673
@elgronch8673 Рік тому
aparently you forgot about Tatra 11 (1923-1927)
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