Inline Four Cylinders - The Most Popular Car Engine

[@dirtyarcade]

Easily my new favorite channel on KZbin.

[@EngineeringExplained]

Thanks!

[@madyanneserat9964]

I like this chanel because of how he uses one of my favorite subjects (physics) to explain the best thing I love

[@RodrigoSilva-nm5dl]

I think it would be amazing for people who are just starting to watch your videos and to learn more about cars and engineering if you could write a "step-by-step" guide. You can't understand the more advanced stuff if you don't know the basics first, so this would be your own list with your own videos ordered from basic to advanced. Would be superb and in my opinion you'd only improve your viewer's engineering knowledge and understanding. :)

[@Landon_N]

Your idea was a great one! I found this video through a playlist he created doing exactly this

[@Ahmadkelsayed]

After 8 years, I hope this guy having a good life rn.

[@SargeandSniper1]

That would explain why a Cummins 4bt shakes like crazy, but not why a 6bt has almost no vibration. Just my observation. Great videos, keep it up!

[@Landon_N]

In his follow up video he explains why the i4s shake so much but the 6 cylinder inlines are inherently balanced

[@atubebuff]

When talking about an engine being "small" it would probably be interesting to mention the difference between interference & non-interference designs. It'll help people understand why their valves can bend when you lose the timing belt.

[@mutznutzgamer]

Very well explained, perhaps mentioning the fly wheel adds up as a balancer, which helps to eliminate vibrations.

[@Jorgetrn]

Thanks for this video. My motorcycle has an i4 engine, and I found this video to be very educational.

[@Kawika680]

Thanks for all the videos. I'm a rookie Tech and I'm always expanding my knowledge. Keep posting

[@seb5945]

Can't wait for more engines - V4, V6, I6, V8, V10, V12 and W16. Please do it.

[@fadedmotovlogs]

awesome vid man, keep up the good work.

[@garyzhong86]

great video! Can't wait to see the flat engine explained in the future

[@omegarugal9283]

the basic combustion engine design, the balance between economy and power

[@SJgunguy24]

The most powerful engine ever ran in Formula 1 was a 4 banger. They laid it on it's side (not completely but to get the CG lower) IIRC it was 1.5L and was pushing 1400 HP. Don't popo too bad on the 4 bangers, you can really do a lot with them.

[@Nikiaf]

It also had one of the best names ever given to an engine: the BMW Megatron.

[@MrKidsMeals]

Nikiaf only BMW could be that cool

[@ethanknight8461]

But it also probably costed more than your net worth

[@healthystyle]

What's the compression ratio for a 4 cylinder in-line 1.6 petrol in psi?

[@paulray4234]

One thing I'm not picking up on is if the firing order is 1342 , then how are 14 going up at the same time and 23 going down. I've been watching your videos in order and I really appreciate your time explaining all of this. Thanks

[@caricatureparty]

they go up at the same time but they only one of them fires. the other one is pushing out all the exaust from its last explosion.

[@caricatureparty]

they both go to the same place at the same time but for different reasons.

[@khemsingh7466]

i want to know how these secondary forces are acting in upward direction?

[@electric7487]

The formula for the motion of a piston and conrod is: D = R cos(theta) + sqrt(L^2 - R^2 sin^2(theta)) Where R = stroke / 2, L = con rod centre-to-centre distance, and theta = angle from TDC. Now remember your double angle formulas? After some tweaking, we can see that sin^2(theta) = (1 - cos(2 theta))/2. There is a cos(theta) term, which represents the primary component, and the cos(2 theta) term represents the secondary component.

[@jerrychase4177]

Please explain the Offenhauser 4 Cylinder Engine and the Inline 6 cylinder, Novi 8 cylinder and V16 variants of this engine. Would continued development of this engine make sense?

[@natgoboom]

Cheers for the explanation.

[@motivationalwealth777]

This is an excellent explanation with makes me think of how great overall the 2.2 s2000 engines are and now the frs has a really nice well balanced 2.0 boxer still I enjoy the overall craftsmanship of the s2000 more. Btw you are a genius!

[@FarmYardGaming]

0:10 Thought you said you'd talk about The Avengers for a moment

[@FarmYardGaming]

Avengerses

[@taveeeee]

Great video again.

[@nightfury6836]

Awesome video!!!

[@MrZeko3rs]

Love your videos!

[@ZeFleischwaffe]

great vid!

[@matheusstrapasson9242]

If a I4 engine has the primary forces balanced, why are the counterweights present in all I4 engines we see daily?

[@GH-oi2jf]

It’s a given that you balance each rod and piston with counterweight on the crankshaft. If you didn’t do that, and relied only on the pistons moving opposite to each other to balance, then most, or at least a large part, of the mass would be in the reciprocating parts. A heavy, balanced crankshaft is stronger and gives smoother operation.

[@dylanspriddle]

Great video, well explained.

[@mdhilwan7321]

Great explanation! Im eyeing a car that uses an inline 4 engine. Watching the rest of ur vids :)

[@iD4v1d]

Make a video about flat vs boxer engines, a lot of people mix up those 2

[@amr19932012]

they are the same !

[@salty126]

Amr EzzElDin No they arent. Boxers having opposing cylinders like a flat v6. Flat fours are basically an I4 on its side.

[@EngineeringExplained]

Flat just means the pistons are horizontal (parallel to the ground), regardless of the layout (boxer, or inline). Boxer engines have opposing pistons.

[@electric7487]

Flat is a general term. Flat V = 180° V engine, crank pins are shared. For each pair of cylinders, when one piston is at TDC the other is at BDC. Boxer = 180° offset crank journals. Each pair of cylinders has both pistons at TDC or BDC simultaneously.

[@bryantack1]

You should make a video explaining VVT. Meaning how it works and ways to optimze the the cam timing for different RPM and loads. Not many good videos really getting into that

[@Mladjasmilic]

Please explain why straight 6 are perfectly balanced , why road V8 have crossplane crank and how it balances engine , why Ferrary now uses 65 degree Vee angle instead standard 60 degree in V12s , how V10 and L5 are balanced , also L3 and 90 degree V6s .

[@EngineeringExplained]

Videos to come!

[@HardcoreCafe]

Don't forget the more exotic stuff like Honda's RC211V V5 or the oval piston V4 from the Honda NR... also radial engines and Wankel engines.

[@LilleyAdam]

V12s are perfectly balanced, regardless of angle. This is because they are two inline 6's. An inline 6 is perfectly balanced, so a v12, which is just two inline 6's that push the same crankshaft is also perfectly balanced. Regarding V10 and I5, see Engineering Explained's video on primary balance regarding the equation used. 90 degree V6's are not balanced. To improve the balance, the use a split crankpin which has a 15 or 30 degree offset, though I forget exactly.

[@emiliepullen2082]

It partly has to do with firing order and what cylinders are at TDC verses what cylinders are at BDC, I don't know much about engines but I know how the physics of them work.

[@Klattooss]

Are you going to explain other types of engines?

[@EngineeringExplained]

Of course!

[@zmanmd1641]

Does a 90 degree V4 have the same secondary imbalance as the inline 4? In particular, was wondering about the Motus V4.

[@DrathVader]

What about inline 6's or 8's? I8 is vary rare, but I6's were quite popular in 90's sports cars. Do they have similar advantages and disadvantages?

[@yeesenchai]

Inline 6 have different advantages. They are the smoothest because everything balances out but it was kinda phased out by v6 for lower center of gravity and packaging

[@EngineeringExplained]

I'll have a video on I6's soon! :)

[@mrunderhill5083]

Well done.

[@rowan2285]

I've always heard that 4 cylinder engines last longer than 6 cylinder engines due to fewer moving parts. However, don't they have to work harder than a 6 cylinder to move the same amount of weight (same sized car - Nissan Altima for example)?

[@GETBACK612]

thanks for the video

[@fabricioteidy]

Awesome stuff

[@CO-ZEntertainment]

Thanks you for this video

[@ronniefoster9467]

Very good explanation. Can you do a video on balancershafts.On 4 cylinder engines they are used to balance out second order vibration. But on a 3 cylinder engine I believe they are used to balance the primary forces.

[@EngineeringExplained]

Yes indeed! (as in make a video on it)

[@LilleyAdam]

Primary forces on a 3 cylinder are balanced. Primary forces on just about all inline engines are balanced. However, on the bottom of the inline 3 crankshaft are counterweights to reduce the pitching motion caused by the piston movements. Note that the zero primary imbalance has no influence over the pitching rocking. The counterweights reduce the pitching moment by about half but also induce a rolling moment. The balance shaft balances the remaining pitching and rolling moments.

[@ArmenianSOADfreak]

Useful video. Can you make one on I3 engines?

[@felixwarnmark]

I sure hope that if you're doing different types of engines that you're going to do one on the rotary engine!

[@EngineeringExplained]

Rotary Engine - Explained

[@Kevin_10225]

I believe this disadvantage of the secondary imbalance can be quite noticeable on small diesel engine found on some small pick up trucks and SUVs worldwide. For example Toyota's 1KD engines (which are 3 liter inline-4) used on Hilux trucks and Fortuner SUVs, and Mitsubishi's 4M4 engines (3.2 liter inline 4s), used in some Mitsubishi body on frame suvs and trucks. These engines, which probably have balancing shafts, vibrate quite a lot, even for diesel engine standards. You can feel it on the whole car and can get obnoxious on the long run. Other engines of this category such the 3.2 inline-5 powerstroke found in the ford transit and ranger t6 internationally vibrate much less. I believe the greatest engine displacement acceptable for an I4 engine is around 2.8, but the most common sizes are 2.5 liters max, and still, there are this larger displacement I4 i mentioned before 🤔

[@Unb3arablePain]

Not a bad engine design, but the only think I dislike is car companies now have cylinder drop fetish. They'll drop their V8s to V6s, V6s to 4cly., and now even 4cly. to 3cyl. Then they will slap a turbo on to make up for the power loss but it's almost never done the right way. Yeah, I understand 2 less cylinders = better fuel economy, however if car companies REALLY cared about fuel economy they'd be pumping out more diesels and hybrids (save for Chevy and Toyota with their diesels and hybrids). Also, a NA engine will always be more reliable and work smoother than a turbocharged one, unless the turbo is done properly and added on to already existing displacement. For example, BMW with their turbos and other companies designing a V8 to incorporate turbos for even more power. Just sticking a turbo and dropping 2 cylinders puts strain on the engine, not to mention lag and other problems. Like I said, great engine design. My 05 Corolla LE runs forever and it works well. I just wish companies would keep their NA engines.

[@desertfox2020]

I would like to see below average displacements without dropping the cylinder count, for sound and smoothness, and torque. A 2.5 liter V8 should be able to make more torque and will definitely be smoother than a 2.5 liter L4.

[@EngineeringExplained]

desertfox2020 There's a lot of cost and complexity in making a 2.5 V8 rather than a 2.5 I4, without necessarily a power benefit. The V8 will have more moving parts, and more chance for reliability issues, everything being held equal. There's at least a few reasons why most smaller engines use fewer cylinders.

[@desertfox2020]

Engineering Explained Power benefit aside, I'd rather pay for the fuel in an old 250 hp 5+ liter V8 than listen to the drone of a modern 250 hp 2.5 liter 4 cyl that gets excellent fuel economy. But that's just me, I guess lol. Thanks for the reply! For what it's worth my current car has a 3.8 S/C V6 so whatever.

[@EngineeringExplained]

I like the sound of my 2.5L 4 cyl: 2014 Subaru WRX STI - Full Review and Test Drive - My New Car!

[@desertfox2020]

Engineering Explained But it's a boxer! I believe we were discussing inline 4s? :) Boxers sound wonderful.

[@JThought320]

Talk about engine diagnostics codes plz

[@joschomo1010]

Good video, so are you going to do this with inline 6's, and v8's, and flat 4's and stuff? That would be a really interesting video

[@EngineeringExplained]

Yes indeed!

[@joschomo1010]

thankyou, keep up the good work

[@enriquesotomayor8256]

Can you do a rotary engine video and any other engine .

[@EngineeringExplained]

Rotary Engine - Explained

[@Re-InCarNation]

He should make a video on the Yamaha cross plane crank inline 4.

[@jinzobeji7552]

hey man your videos are really amazing and clearly coming for a professional..how do you know so much about cars ?? is it by your own researches or u learn it in class if yes what do u study ?? i wish i knew this much about cars :(

[@EngineeringExplained]

My own research. But if you want to know as much as I know, all ya have to do is watch all my videos! :) www.howdoesacarwork.com/p/faqs.html

[@psions555]

hey dude love your videos. had an idea that maybe you could do a video on how Alfa Romeo TwinSpark engines work. i know you have lots of vids on timing, VLIMs and ignition systems it's just the TwinSpark is an interesting design to me

[@threelettersyndrom]

Can't you remedy secondary forces by making two pairs? In a pair, the cylinders will cancel eachother's primary forces, while the pairs cancel out eachother's secondary forces. Or does that give rise to some other issue?

[@liftonly2]

Can you do an explanation video on the 4.0 liter inline 6 in the jeep cherokee xj and why its so robust.

[@shinichichiba]

what would happen if you coupled two inline 4's and what would the firing order have to be?

[@Antoniocool86]

Great videos. Can you do Subaru's boxer 4?

[@shyamrangapure8312]

How is that all the 4 engines have secondary forces pointing upwards at the same time? When 1,4 are at tdc 2,3 should be at bdc so 1,4 should have higher upward force than lower downward force from 2,3, isn't it? I'm sure I might have confused somehow

[@quan22777]

Hello, can you possibly do a video on fuel cell powered cars?

[@parthapratimsaikia1906]

can you tell me how the secondary forces plot arise here and their frequency..

[@EngineeringExplained]

partha pratim saikia Yep - kzbin.info/www/bejne/nZWrgmuXicuch7M

[@parthapratimsaikia1906]

thanks a lot.. is there any material related to power or torque distribution in multi cylinder engines?

[@cdysart15]

Can you compare and contrast a Inline 4 with a flat 4? Also does the secondary forces do anything besides make vibrations? Such as affecting reliability, power or fuel consumption?

[@EngineeringExplained]

I will have a video on a flat four, soon! :)

[@HardcoreCafe]

That's exactly what I thought when I saw your smile ...knowing that you own a flat four powered car now.

[@MrIrrepressible]

If you could negate or reduce the vibration of the secondary force would more power be transmitted to the wheels of an i4 car?

[@EngineeringExplained]

Depends on how you reduce/negate it. Regardless, it would probably be a fairly minimal impact on power. I'll have a future video on balancing shafts to show how to reduce it.

[@fanousontheloose]

Great video! you've answered one of my cars mysteries!! I have a '97 Toyota Previa which runs on an inline 4cyl engine. I always notice that when I'm idling that my car is always vibrating! Mirrors and anything else just a bit loose fitting. But Toyota took care of the High CG issue and put it on its side in the middle/bottom of the car.

[@super_duper_heeper_turbo9266]

Q: does inline 4 engines devides the whole declared CC? for example (bmw s1000rr) suppose to be 250cc per cylinder or 1000cc per cylnder?

[@7150285]

Jason, an inline engine vs a V type engine (the same size). Which one will be better and which one will u prefer?

[@EngineeringExplained]

I'll have some videos on V engines. They both have their advantages.

[@F9000LIi]

Awesome vid very informative....please explain Subaru's H-4cylinder & H-6cylinders enginea.

[@healthystyle]

What is the compression ratio in psi for these 1.6 petrol 4 cylinder, please?

[@john-rosssnell2890]

hey I will like to know if u build up a 4litre v4 engine with lighten piston ect to make around 700hp will it be more fuel efficient than say a and 6l v12 referring to an aventador

[@phantomstratocaster]

would it be possible to make a 8 cylinder engine with a flat head 4 in the middle and 2 [90^] cylinders in the front and 2[90^]cylinders in the back for a total of 8 cylinders or a v4 in the middle with 2 v cylinders in the front and back so it is capable of operating 4 or 8 cylinders at a time?

[@rahulsharma-mi6rz]

how do u decide the direction of primary and secondary forces as u have shown that all the cylinders are having the direction of secondary forces pointing up

[@electric7487]

He illustrates them when the pistons are at TDC or BDC. When the pistons are all in the middle, secondary forces point down while primary forces are zero.

[@spencerfarrow7416]

Would A crossplane crank shaft inline 4 be with the secondary balancing ?

[@davidwells2982]

I have always wondered why the cylinders are aligned bored with the center of the crankshaft. It seems that more power could be made if the connecting rod was straighter during the power stroke, with less sideways pressure and friction on the piston. I'm sure it would add vibration, but what other disadvantages are there?

[@TheYazone]

It is possible to make a 4 cylinder boxer engine? Could that position of the pistons lower the CG? Then you could add some superchargers to improve the HP of the car and, with the low CG, make a hot hatchback, for example?

[@EngineeringExplained]

Swap the supercharger for a turbocharger, and that's my car! 2014 Subaru WRX STI - Full Review and Test Drive - My New Car!

[@LilleyAdam]

Engineering Explained semantics here, but turbo chargers are super chargers with a turbine thrown on the back.

[@TheYazone]

Engineering Explained Oh God, you have an awesome car! Mine is a VW Golf TDI 1.6. Not much, but with 105 HP is fine. I like the Lexus C200h too, but is so expensive, then...

[@triggerfishable]

can you explain to me how you could have a crossplane i4. just like one side of a crossplane v8? or is there more to it?

[@ΑΡΗΣΚΟΡΝΑΡΑΚΗΣ]

Tyler Henry you buy a Yamaha R1

[@d.haroldangel241]

So, can you FULLY balance an IL 4 using the various methods?

[@zachary3777]

What about crossplane I4? Like on the yamaha R1.

[@EmyrWood]

Can you do a video on Methanol Injection? :)

[@ThrottleJerk]

Would it be possible to put an inline 4 cyl on the side so we can have a lower center of gravity?

[@EngineeringExplained]

Yes, certainly possible but packaging could get strange. There are also flat fours, which I'll have a video on soon.

[@nkboz28]

I drive a 2009 MINI Cooper S (turbo model). Would you have any ideas on how to get extra horsepower out of the stock engine. It's a 1.6L 4cyl. turbo with DOHC. As far as I know I can add a better filter, ie Cold Air, and better exhaust. I'd also like to upgrade the intercooler, but beyond that I'm not sure. Please grace me with your wisdom because I love cars, but I'm not one to work on them. Thank you in advance and also thank you for providing videos that allow people like me to learn.

[@ΑΡΗΣΚΟΡΝΑΡΑΚΗΣ]

Remap it

[@nkboz28]

Good idea, just can't afford a remap atm but definitely a must

[@ΑΡΗΣΚΟΡΝΑΡΑΚΗΣ]

+kyle boswell I have a remaped BMW E46 compact, believe me is a little beast in the mountainous twisty roads of my country

[@TheFerrarispyder]

Can you make a video on the chevy sonic rs engine

[@prakashs1674]

We can balance out center of gravity by balancing the weight of the car???

[@ATLDroneGod]

Ford perfected this with the I4 ecoboost 👍🏼

[@ryankenny6079]

do one for straight six :x

[@bartojoe]

Great. I need help, I repaired a 2001 mirage 1.5 new rod bearings, piston rings, Felpro head gasket, new Japanese oil pump, but when I start the engine I noticed that the oil is not reaching the cylinder head. This never happened to me. I'm wrecking my head tryin to figure out what it is. Any ideas? Thanks

[@RaggaDruida]

do L6, boxster 6 and V12, those are my favorite xD

[@LilleyAdam]

boxer. not boxter.

[@MrBruneras12]

Much explained.

[@fredbeer6950]

Can you do v8s explained

[@gunmen424]

Does a 5Cyl engine in a Volvo S60 2.5 Turbo work the same way?

[@Tanatious15]

Could you explain Honda Vtec engines Acura NSX

[@EngineeringExplained]

VTEC - Explained

[@a.louisejones3785]

what about I5 like in some Volkswagens and Volvos?

[@Bazawaza1]

can you please do a video on the Crossplane crankshsft ?

[@EngineeringExplained]

***** kzbin.info/www/bejne/lYXWpIt8bd6Em80

[@stumftim]

Is there a crossplane L4 video too? (like yamaha R1)

[@stumftim]

Nevermind, a V8 is just 2 L4s stuck together at 90o

[@maddogthekid8290]

Can i put this into my homework?

[@peacekiller89]

hi can you make video about big block and small block difference and also the numbering they speak about 428 big block.

[@Luc1dKn1ght]

Big block and small block refer to the engine block, or the lower part of the engine that the crankshaft sits in. Really the only difference is that one is bigger and heavier duty. When someone talks about a 350 small block or a 454 big block or like you said, a 428 big block, what they are referring to is the displacement and what style engine block the engine is. A 350 would be 350 cubic inches which is the same as a 5.7 liter. A 428 cubic inch would be a 7.0 liter engine. Again this comes from companies like Chevy, Ford, and Pontiac back before foreign cars were as big of deal as they are now, because they would use the standard measurement of cubic inches instead of the metric liters.

[@salty126]

Luc1dKn1ght Saying big block or small block has nothing to do with displacement even in the `1960s. there could be a 350 bigblock or 350 small block.

[@Luc1dKn1ght]

salty1264 Which is why I said, "what they are referring to is the displacement and what style engine block the engine is." But that is a good point to clarify on. Displacement is not dependent on block style but somethin in the 300's is commonly going to be a small block

[@enja001]

do an inline 5

[@carlossaunders554]

Can we avoid this second harmonic with boxers engines? thanks

[@V1ralB1ack]

Yes. Boxer 6 engines are more harmonically balanced than an inline engine. The reason they aren't popular is because they are big and flat and that makes them just as hard to fit in a car as an inline engine. Fun fact, Subaru's boxer 4 engines are angled downward so in case of a high impact accident the framing will absorb the impact and the engine will be shot downward destroying the transmission and saving the driver.

[@carlossaunders554]

@@V1ralB1ack that's is nice, thanks mate

[@maddogthekid8290]

bruh i didnt need my brother for my project this time

[@Dani2wheels]

Can you please explain why my carburated 2001 Yamaha R1 with FIVE valves per cylinder has the same HP as the 2002 R1 with fuel injection but only FOUR valves per cylinder? I really wanna know why an extra intake valve proves to be useless.

[@jord505]

its most likely not more 'powerful' but rather more reliable, and efficient. simple refinement i assume.

[@DrathVader]

With 5 valves per cylinder design you should have faster response to opening the throttle, because you have more intake flow and filling cylinder with the mixture is better. Also 5V engines SHOULD be able to rev slightly higher than 4V.

[@BloodstainedSinner]

It's because fuel injection is more precise, while carburation is a pretty inaccurate method of putting fuel into the cylinders. With this, a caarbed engine basically sucks fuel into the cylinder head, and hopes it ignites properly. A fuel injected engine squirts fuel exactly where it needs to be, and the exact amount that needs to be there, resulting in better combustion (which means more power) and less fuel being used.

[@anjaninator]

why can't you put another inline that connects to the same crankshaft but its is facing down so that the secondary forces would also cancel out, i assume people already thought of this

[@tolikechicken]

+OnJohn They exist, but they are almost always rotated. They are called flat or boxer engines.

[@lolzforthewinzor]

Why do inline 4s produce more power than a similar capacity v4 or twin?

[@EngineeringExplained]

I wouldn't say that they do.

[@kananisA75]

Is the engine in bikes balanced the same way?

[@EngineeringExplained]

For four stroke inline engines, it could be the same. There are other methods though, I'll have additional videos with time!

[@kananisA75]

Engineering Explained Thank you !!!

[@Jwelthag]

The Mercedes M271 Engine is a great I4 DOHC Engine. Seriously.

[@hannahkan0622]

Can a V4: 1 3 2 4 used instead of an I4: 1 2 3 4

[@worldofai-games1036]

+yiu yeung Kan They can be used. However, it's a V engine and it will have more parts (two camshafts, two sets of valve banks) compared to an inline. If you want something like a V4, check out Subaru's Boxer engine. They use Flat-4 engines which provide perfect secondary balance.

[@sermerlin1]

Ey man... Is it possible to modify a non turbo inline 4 engine and add turbo to it? My car is Seat leon stella 2003 1.6 16v engine... 1598 CC and 105 BHP. It's petrol engine. I would love to be able to boost my car and how much if possible the mods woould cost? I'm expecting at least about 2 to 3k euros right? Also how much HP would i be able to pull out with this engine once it's turbocharged?

[@user-rp4je2gc2o]

ofcourse it's possible, but it's gonna cost alot, you're better off buying a more powerfull one

[@sermerlin1]

Vos Well I'd rather have my car modded then buying stock faster... It would be almost the same and modded car is way cooler then stock faster :)

[@manthanbhargav6391]

What is W16 engine?

[@99Bodi]

Yamaha solved this secondary forces problem, by using a crossplane crankshaft on the 2009+ R1

[@LilleyAdam]

A cross plane is a much less balanced design.

[@vasco984]

Yamaha has a cross plane 4 cylinder.