The "famous hudson hornet" has a bit of a story about this... as Smokey Yunick was the mechanic on it.. he wanted to offset the bores like this but they wrote in the rule book "you can not offset bore the cylinders in the block from factory position" so Smokey Yunick offset the crank in the block...😂 and moved the gearbox across aswell... always thinking 1 step ahead of the officials
@ARockyRock7 ай бұрын
That's genius.
@arlynspencer54306 ай бұрын
This "Offset Cylinder Design" was First used by the Rambler Car Company in 1908. Other Designs are an, Offset Connecting Rod, shaped as 'b' or 'd' - where the "circle part" connects to crankshaft-conrod journal - the "Top of vertical line" to piston. The connecting rods (con-rod) used in this Video are standard "I-rods" - centered equally to the con-rod journal and are almost exclusively used in engines. Experiments with "b & d" conrods go back some 50yrs and both were found to create "Piston-dwell" at TDC & BDC, depending on - degrees of offset. Patents for Offset Cylinder and b & d Con-rods have Expired, are now Public Domain.
@grantfuller20167 ай бұрын
The very first polytechnic course I did when I became a motorcycle mechanic ( about 40 years ago ) , involved stripping and measuring an old ( already old at that time ) Briggs and Stratton lawn mower engine . Those engines today would be perhaps 60 years old , and they had cylinder offset . I recall that because I had never considered the possibility and was questioning my measurements . I don’t recall the amount , it wasn’t enough to see with the eye , but it was there . I think 1 or 2 mm . Honestly , I’ve always thought it was a normal part of engine design since ( maybe they are pushing that offset further now ) .
@fredrikbergdahl29887 ай бұрын
It is indeed a normal part of engine design. A small connecting rod angle on TDC keeps the piston held towards one side of the cylinder, which prevents it from rattling in the bore as it changes direction. But that is, as you found out, only a couple of millimeters or so.
@paulshubsachs49776 ай бұрын
This "désaxé" principle was followed by top-class designers such as Henri Toutée. Hard to say who originated the idea, but it certainly dates back to the early 1900s. My 1934 Chenard et Walcker has slots cut into the lower cylinder areas to accomodate the bias of the connecting rods! The balance problem is probably why the forward face of the flywheel casting includes a hefty annular integral "balance" (?) ring. I was thinking about machining it off, but your timely explanation is making me re-think!
@andrewwmacfadyen69587 ай бұрын
Small amounts of cylinder offset were originally introduced many decades back to counter piston slap.
@realdbcooper34232 ай бұрын
surely if you bring back the h configuration this balancing issue can be resolved?
@turboslag7 ай бұрын
This is known as the desaxe design. It has been used frequently over the decades. The true endorsement of it's advantages would be it's use in racing engine design and offhand I don't know of one, although there must be, given the constant quest for advantage in racing.
@gavmansworkshop56247 ай бұрын
Some air compressors use the offset for the compression stroke I've found too.
@North7007 ай бұрын
Don’t know if he was the first but smoky Yannick employed these principles in his early days of racing
@ColCurtis6 ай бұрын
In your animation the connecting rod hits the cylinder wall and the poison exits the cylinder at bdc
@cri1410sti16 күн бұрын
yes, that huge offset is possible only in that animation, in real life the offset is 5.5mm to 1cm 😊
@PerpetualMan227 ай бұрын
Changes the mechanical advantage the connecting rod has against the crankshaft in the begining of the power stroke
@shawnmcatee8957 ай бұрын
Cylinder offsets are as old as the 4 stroke engine. And depending on the engines use, can be great, or a huge liability. When off throttle, with high compression ratios, it's not uncommon to break the piston or the rod, or both, with the severe rod angles on the up stroke in off throttle scenarios.
@PokySan22 күн бұрын
It seems as if the friction is most important however it is mostly about newton times distance, make a sheet showing the total area (integral) of the newton meter curves for each engine resulting in a power advantage.
@SJR_Media_Group7 ай бұрын
We have used longer rods and shorter strokes in the past Over-square allows higher RPM and less piston slap. This is due to the angle of rod and piston is less.
@martin-vv9lf7 ай бұрын
I have to wonder if you had a boxer engine with both blocks offset would it be balanced.
@Eduardo_Espinoza7 ай бұрын
Same thought! :)
@andrewirving39827 ай бұрын
The air cooled vw engine has the pistons offset about 1.5 mm
@edgarasvas7 ай бұрын
In my university this construction was called dezaxial pistons. I learned it 20 years ago. God knows when it was constructed. So its kinda old.
@TravisFabel7 ай бұрын
So thinking about this, If you had a 90* V12 or 190*boxer engine, with offset cyls, its possible to counterbalance it completely with almost no weights.
@johnnysodak72617 ай бұрын
Can you elaborate ?
@Hjfvvdst7 ай бұрын
I have wondered about cylender cant and offset combined. Small amounts. Some of my questions are in the offset what happens with cam timing and duration ramp rates. Then, flame time and piston speed down the cylender. Fuel flame speed. It seems in an offset torque would increase. Cylender cant may also improve Torque. It may also improve piston side load. Just thoughts.
@billjenkins36997 ай бұрын
Cylinder....
@billygriffin30797 ай бұрын
Effects on a two cycle engine such as non symmetrical port timing , increased transfer velocity, effect of a longer stroke mechanical leverage, and a longer power cycle.
@Eduardo_Espinoza7 ай бұрын
Maybe ring catching prevention too = bigger ports :)
@matthewfredrickmfkrz19347 ай бұрын
Probably an easy mod to the jug if you drill for bigger studs idk about sealing the base
@tavaresrco4 ай бұрын
pelo que se pode entender essa inovação pode ser aplicada em qualquer motor, e não ficaria nada surpreso se encontrasse um antigo motor diesel com essa configuração, pois é até meio óbvio que a força não deve ser aplicada linearmente sobre o eixo e sim no deslocamento, assim como fazemos ao pedalar bicicletas. Bem problemas com patentes a parte, se pegarmos um bloco de motor convencional cortarmos justamente no final da camisa do pistão e adicionarmos uma junta em ângulo, do mesmo material que o restante do bloco, tudo que temos que fazer é ajustar o comprimento das bielas para ter um motor que atenda essas novas especificações... se o corte for bem feito e a junta tiver as medidas muito bem calculadas, nem ajuste de bielas será necessário... O bom disso, é que esse novo motor além do benefício do novo ângulo ganha também sobrevida pois as retificas podem explorar esse novo ponto de corte para eventuais correções e ajustes. Uma pena eu não ter uma oficina ou dinheiro para fazer os testes... mas talvez alguém ai lendo isso sinta-se inspirado a fazer esse teste...
@cjespers7 ай бұрын
Piston pin offset, pin height, rod length, all things to consider. Thanks for the cool video.
@PatrickDelgadillo-r9q3 ай бұрын
I suspect this came about from curiosity of hot rodders use of piston pin offset for power gains. In other words flipping the pistons opposite of oe installation. The offset cylinder would have been a logical progression of that idea.
@Eduardo_Espinoza7 ай бұрын
I think this would be perfect for a boxer or flat engine layout :)
@yummyhershey59027 ай бұрын
It would be very strange for a boxer. Because of the opposed cylinder layout, in order for both banks to have the correct offset one bank would be raised higher, and the other would be lowered. I feel like that would create problems with assembly and strength, and may make it harder to properly lubricate and cool the motor.
@motorradmike7 ай бұрын
I think the offset technology can only be realized with an in line engine.
@bugsmousey91837 ай бұрын
The fb20 has asymmetric connecting rods
@donrothwell14216 ай бұрын
Every flathead Ford v-8 had it plus offset wrist pins.
@beachboardfan95447 ай бұрын
Sweet jesus! A 13 min vid on desaxe cylinders but never once mentioning desaxe!
@kennethprocak51767 ай бұрын
The only reason you would do it is to reduce engine height. And you could reduce engine length if you stagger every second piston. Volkswagen VR5 and VR6 engines used it.
@loganshotrod4x4647 ай бұрын
Connecting rod failure is almost always attributed to failure of the rod bolt & the rod bolt is under the most stress at TDC at the end of the exhaust stroke & at the beginning of the intake stroke… that’s when rod bolts break & an offset cylinder makes it even worse. Yeah, you might make more power with a severely offset cylinder, but it comes at a cost of reliability.
@camaro920266 ай бұрын
How is the connecting rod going through the cylinder
@73-carina187 ай бұрын
when this offset would gain enough,all the engines would have been build like this,long ago. but buildingcost,to overcome the specific needs for this style engine are probably higher then the gains.
@thomaslindell54486 ай бұрын
Doesn’t this in balance the engine
@philkuusisto15587 ай бұрын
I expected to see more torque as the power stroke happens at a little more leverage from the crank.
@jiyushugi10857 ай бұрын
Yamaha uses offset cylinders in its 4-stroke, single-cylinder motocross bikes, and probably in some other models as well.
@B1g_Tarn7 ай бұрын
I thought that was in their outboard motors didnt know their bikes used it
@jiyushugi10857 ай бұрын
@@B1g_Tarn I do a lot of translating work for Yamaha in Japan but I've only done a few outboard jobs for them. I'm headed over there next week and will ask my contacts there. If they're also using them in the OBs perhaps they're using them in most of their engines.
@alejandroesteves89037 ай бұрын
it has always been there as part of a kinematic analysis! it was waiting to harness
@daddycool8897 ай бұрын
Toyota in the ‘90’s claimed to have cylinder offset in a concept car, it also had soft valve springs as the engine was designed to not rev past 4000rpm. I remember all this but not the concept car.
@samsungtvset33987 ай бұрын
Sounds exactly like the Prius engine.
@Galatzo7 ай бұрын
Seems like an off-center flat engine might be easier to balance that a V engine
@shaikkareem16376 ай бұрын
In offset engine, It might in turn produce friction during the compression cycle.
@DrKnowNothing14 ай бұрын
Yes, but the pleasure is much lower, so the friction force is much lower during this step of the cycle.
@tedjones-ho2zk7 ай бұрын
Could do an offset connecting rod instead of offset cylinders.
@terrypikaart43947 ай бұрын
They have been offsetting the wrist pin for 50yrs or more. Same effect.
@Cobra427Veight7 ай бұрын
Yeah , but only by about 1.5 mm .
@andrewwmacfadyen69587 ай бұрын
To counter piston slap.
@countryjoe35516 ай бұрын
Kind of similar, but not entirely the same benefits.
@watchyMCFCwatchy7 ай бұрын
Norton tried this on their Manx race engines in the 50's and 60's. They couldn't even measure the difference.
@JxH7 ай бұрын
"...in the 50s and 60s."
@bountyjhonny26282 ай бұрын
thank you for this information
@abrokenpal7 ай бұрын
Balancing these cylinder offset engines are a hell. Doubt it will be mainstream.
@richardcasey75217 ай бұрын
Great video!
@robertbritton47167 ай бұрын
Not for 2 stroke?
@fuckingpippaman7 ай бұрын
i was thinking the same
@chrisjarvis44497 ай бұрын
offset piston pin in v motors ! same thing ?
@JxH7 ай бұрын
You referred to the crank *counterweights* as a "balancing shaft".
@yodab.at17467 ай бұрын
It confused me. I thought the counter weights on the crankshaft were primary (countering the weight of the piston and wrist pin going up and down or side to side in a boxer) and secondary forces were generated by the weight of the big end (essentially being thrown from side to side).
@RoyDees-t2k7 ай бұрын
You never mentioned how much the offset is.
@Eduardo_Espinoza7 ай бұрын
Looks like half of a piston ratio
@JxH7 ай бұрын
Not a large number of mm.
@cri1410sti16 күн бұрын
@@JxH i didn't saw more than 1cm
@ehb40314 күн бұрын
assuming the 9 degrees (at 3:30) is in reference to the 72 mm stroke (5:15) and an average rod/stroke ratio of 1.8 (slightly longer than average but let's assume we're "pushing it" for efficiency) or 129.6 mm, a little bit of trigonometry gives us an offset of 31 mm (sin9 x 201.6). I think this is too high (maybe my calculations contain an error), I'm pretty sure Yamaha uses single digit offsets. An offset of 6 mm in this engine would give a TDC angle of 1.7 degrees.
@kurtdobson7 ай бұрын
I had thought about this in 1979 but couldn't figure out the implications on balancing...
@somenygaard7 ай бұрын
Interestingly enough I thought about it as well once in 1976 then again briefly in the summer of 1981. I had intended to build a totally custom one off V12 engine to test things out but I forgot about it until this very moment thanks to this video. Time to get to work.
@davidk43386 ай бұрын
My 1934 Massey Harris tractor engine has offset pistons! This is not new technology.
@lordvalentine4717 ай бұрын
Could this be done in an opposed piston diesel configuration
@marvinmcconoughey35477 ай бұрын
Yes. The visual aspect will look a bit odd, but that would have no operational impact.
@lucientjinasjoe15786 ай бұрын
And I thought that i had a secret in the 1975 with ofset and longer rod converted a steet bike with a two stroke 7o cc engine 5 hp in more than 15 hp
@SchoolforHackers7 ай бұрын
Balance shaft? Please look up that term.
@Abigailrp7 ай бұрын
counterweight
@SchoolforHackers7 ай бұрын
@@Abigailrp Correct.
@Bizmyurt7 ай бұрын
Very easy just make a zick zack 6 cykinder engine and it will be naturally balanced!
@tonyfree26917 ай бұрын
Has to be more friction on one side
@Eduardo_Espinoza7 ай бұрын
Yes minus the power stroke though
@tonyfree26917 ай бұрын
@Eduardo_Espinoza of course ! Eve bettin 2 stroke do you think?
@robjones87337 ай бұрын
Toyota 2AR-FE has this setup.
@voicucristian48007 ай бұрын
That work on Renault 12 since 1968...
@cri1410sti16 күн бұрын
Renault 12 1.3 to 1.4 C-engine does not have this
@hotmav7 ай бұрын
Is the VW VR6 engine offset pistons?
@Motor-City-Mike7 ай бұрын
This is so far from new, it's ludicrous. This tech is roughly a century old, SMH!
@Bloodcurling7 ай бұрын
Opposite on the way up
@Einimas7 ай бұрын
V configuration would look "special"
@wandamaddox78247 ай бұрын
Yeah, like a VW VR6
@Einimas7 ай бұрын
@@wandamaddox7824 does only a half of the vr6 has this benefit?
@Eduardo_Espinoza7 ай бұрын
Good point @Einimas I do remember hearing it had issues with vibrations even though they call it the "compact inline 6"which is very ironic Maybe they can make one side normal instead?
@wandamaddox78247 ай бұрын
I think it is not offset like this video describes. It's weird in a different way.
@garnerblair51796 ай бұрын
VR banks are offset opposite of each other
@65bug5197 ай бұрын
All I have to say is " slant 6"
@timhallas42757 ай бұрын
This is one of those ideas that net zero improvement over existing designs. But I'm pretty sure someone will give someone some money.
@rhrh487 ай бұрын
شكرا
@zafar786007 ай бұрын
no way jose
@boardernut7 ай бұрын
This was "innovated" several decades ago. Is this AI generated content ?
@frankd.b.92337 ай бұрын
Just more rpm and less nm
@mr.joshua29377 ай бұрын
This is nothing new. Nissan has this in some of there older vehicles with smaller displacement engines.
@davidwickboldt7127 ай бұрын
New??? Not so much.
@tonywood36607 ай бұрын
This is nothing new....
@gerrydrummond32875 ай бұрын
Find a better description of an offset engine. This is clearly written by somebody who doesn’t have English as their first language and they’re using artificial voice.
@yusuffirdaus39007 ай бұрын
Offset cylinder have bad balance
@cri1410sti16 күн бұрын
that why they applied to 3cyl engines, the engines were not balanced from the start :)