What is twin-v engine? where is it used ? and how it works ?

Answer 1

In a true V-twin engine, for example Harley Davidson engines, the two cylinders share a single crank pin (also known as a journal) on the crankshaft, therefore the "twin" nomenclature. Two cylinder, V shaped engines with separate crank pins for each cylinder are more properly called "V-2" engines, however, proper identification of V-2 engines is uncommon. They are frequently referred to as V-twin engines, too, although this is technically incorrect.

V angles
The most obvious configuration for a V-twin is a 90°, in which counterweighting can balance the engine, in odd firing 90 degree Vees. This is seen in the Moto Guzzi and Ducati, but other angles can be seen like the 45° of the classic Harley-Davidson engine, the 75° Suzuki, the 52° Honda, the 80° Honda CX-500, the 47° Vincent, the 42° Indian, and the 60° Aprilia.


Orientations
The terms longitudinal engine and transverse engine are used to refer to the crankshaft orientation. A common mistake with V-2 engines is to refer to the cylinder orientation (as mentioned on BMW's web site). However referring to the crankshaft gives a correct method to engine orientations as it gives the same orientation for all V-engine types like V-2, V-4 (which would be difficult to describe with cylinder orientation) and V-8.


Transverse mounting
Both two-cylinder V engines are common on motorcycles. The engine can be mounted in transverse position like on Harley-Davidsons, Ducatis and many recent Japanese motorcycles. This transverse position gives the motorcycle a reduced frontal area. The main disadvantage of this configuration is that the rear cylinder and the front cylinder will receive different air-flows making air cooling somewhat problematic especially for the rear cylinder.


Longitudinal mounting
The longitudinal two-cylinder V as seen on Moto-Guzzis and some Hondas is less common. This position is well adapted to transmission shafting. When used in motorcycles, this approach has the slight disadvantage of causing a torque reaction that tends to lean the motorcycle slightly to one side. However, many motorcycle manufacturers have corrected for torque reaction by rotating the transmission input shafts and/or the balance and drive shafts opposite that of the crankshaft so that there is approximately equal mass turning clockwise and counterclockwise at any time, thereby physically canceling the effect.

The longitudinal V-twin motorcycle engine is the logical alternative to the flat-twin configuration. The flat-twin has better overall engine balance but is wider in profile. This requires the flat-twin to be mounted high on the motorcycle to avoid cylinder heads touching the ground in curve. On the other hand a V-twin could be mounted lower and could result in a lower center of gravity for the whole motorcycle.



Engine balance
Piston engine configurations
Straight Single, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14
V 2, 4, 5, 6, 8, 10, 12, 16, 20, 24
Flat 2, 4, 6, 8, 10, 12, 16
W 8, 12, 16, 18
Other inline H, VR, Opposed, U (Square), X
Other Radial, Rotary, Pistonless (Wankel)

Answer 2

Several of the other posters have already explained how a V-twin engine works. I just wanted to mention that this design shows up in a couple other applications besides motorcycles. For example, Briggs & Stratton makes V-twin engines for lawn tractors. They also show up in some generators and industrial applications.

Answer 3

A V-TWIN engine is a 2 cylinder (TWIN) configured in a "V".
The angle can be different (Harley's are 45 degrees, old Indians were 42 degrees). Usually, the big end of the connecting rod rides a common crank pin. It allows a large cu in engine in a narrow package.

Answer 4

VISU got it!
To ellaborate (because the answer is complete and correct as it is), the V-twin has the advantage of a narrow width that can pack a lot of dislacement into a very narrow frame.
It has the disadvantage that, in air-cooled engines, the rear cylinder tends to heat up more, being out of the uninterrupted air flow.
The reason they are used in Harleys and customs and clones in the US is a complete lack of imagination in the buyers (not the builders, who are just cowardly weenies afraid to experiment). Because grandpa's motorcycle had a V-twin, their bike must have a V-twin. Doh!
Heck, most of those rubes think Brando was riding a Harley V in "The Wild Ones" (when it was actually a slant-twin Triumph!).
Do yourself a favor, and keep an open mind as to engine configuration. 100 years of technology has made more modern engines that are MUCH nicer to ride that the "potato-potato-potato" sputtering of a V.

Answer 5

What is it:
A V-twin is a two cylinder internal combustion engine where the cylinders are arranged in a V configuration.

Where is it used:
Motorcycles only (cars are too heavy to move with only two cylinders and the balancing issues make it vibrate too much for comfortable car driving. Although motorcycle riders LOVE the rumble of the motor.)

How does it work:
Too big of an issue for this post. However follow this link http://auto.howstuffworks.com/motorcycle.htm and you will find everything you wanted to know about how motorcycles work... and then some! It has lots of pictures and motion graphics too!

Answer 6

not twin-v but V-twin. V-twin normally refers to Harley Davidson or Moto-Guzzi engines.

2 cylinders in a V shape, get it? V for the shape, and twin because of 2 cylinders.

There are many other companies out there that now sell V-twin engines, but the above name companies have been selling them longer then anyone else.

Primarily used in motorcycles
4 -stroke, 2 cylinders internal combustion engine.

look here. http://auto.howstuffworks.com/engine1.htm

Answer 7

Never having owned a Sporty i'm not really sure what's best for it.I would go to some of the Sportster forums and see what they have to say.Harley claims you can use their synthetic in all 3 but i wouldn't do it.20/50 oil just isn't heavy enough to withstand the shear forces of the gears in the transmission in my opinion.I've owned Harley's for 36 years and the very best thing for the transmissions i have used is Redline Heavy Shockproof synthetic.It will make your bike shift like it has never done before.No clunk between 1st and 2nd.I also use Redline MTL in the primary.The Lucas is fine for the engine though.Personally i run Mobil 1 V Twin.I'm thinking of going to Aimsoil though.

Answer 8

Sagar-S ; Something I noticed that neither Grenle, or Visnu mentioned
is that -on V-twins WITH an 'un-even' firing-beat: like Harleys, for example
-(rather than the tame Yamaha 'Virago'-series)..
Is that IF you wish to, say "HOT-UP" a 883 cc. 'Sportster'; bare in mind that the FIRST
cylinder "In the Beat" -on full acceleration- "grabs" a far-bigger 'charge' of (explosive)
fuel/air mixture as: "First, gets IT First!": a bigger load on its con-rod, & piston..
The way Harley deal with this inherrant problem -when grinding their 'long-duration'-
racing camshafts.. is to design a MUCH fatter INTAKE lobe
-onto the leading-edge of the "2nd-cylinder's" intake-valve lobe.. This slightly crude
-for 2007- way of solving the inherrant problem
-works, and works well!.

Now.. IF I was running a "solid-lifter" camshaft - in ANY "off-Beat" twin..-including MOST front-pair/rear-paired cylinders on -even- almost all 4 cylinder 'hot-rodded' motors;
(except a very few '70/'80's Nissan engines, with "crossed-over" intake manifolds) -the old twin-carb. engines , I would set the INTAKE clearance ON the "[second]-bite" cylinder about 2-"thou" TIGHTER -than the "FIRST-bite" cylinder.. (and, soon you'll understand it -ALL.)

Yes; you remember the sound of the old, high-compression M.G.B's:
THAT is the reason [for the] (slight) "double-Harley" sound from their exhausts!
It was a slightly serious problem in a Triumph 'Dolomite Sprint'
(semi-racing) engine with, basically perfectly 'elliptical' valve-timing..
(as that engine used a "simple" system of one cam lobe -'doing' TWO valves!)
The single lobe would be running on the heel/ 'bucket' of the intake-valve,
-ALSO articulating the EXHAUST valve -(by a usual)- 1.62:1 ratioed valve-rocker:
(AND the cylinder heads were even 4-Valve/cylinder combustion-chambers!) ..Valve-clearance, though was by "pallet-shims": 5-cent,-or "Six-pence-like",
little spacers: -NOT quickly adjusted.. for 'fine-tuning'!
(Certainly Nissans "crossed-over" intake manifolds
"evened-things up" -on the 'twin-carb' engines -perhaps of 1600 cc..).

So, Harley owners easily 'do it' -compared with the racing Brittish Sports-Car brigade.. Triple-carburettored E-type Jaguars were -possibly- THE most difficult to "get-on-song"
when using the original triple S.U. instruments -with a pair of "D-Type" racing camshafts
-(really intended for a motor of considerably SHORTER-stroke than 106 mm.
-as all 3,8, & 4.2 Jag motors are; unlike the 'revvy' 3.4 litre: perhaps a better racing engine
-in the vein -in the crank department- of a Miller/Offenhauser -if correctly prepared)..

Answer 9

It's a Harley Davidson engine, used on HD motorcycles. Go to www.harleydavidson.com

Answer 10

Moron you are.