Engine valves?

Question

Hi everyone
As i understand an 8 valve 4 cylinder engine has 2 valves per cylinder with one acting as an input and the other the output(Sorry i cant remember the correct terms for them)
And a 16v engine has these doubled so you get double and thus a faster car.

my question is how does a 12v engine work?

Cheers, davy

Answer 1

I think you are talking about a v-12 motor like the ones found in europe, Ferrari, lambo, etc. However I will explain that a 12-valve 4-cylinder motor will have two intake valves per cylinder and one exhaust valve per cylinder. 3 valves per cylinder total x 4 cylinders = 12 valves. The reason why they add more intake valves then exhaust valves is its easier to push gases out then to suck (vacuum) them in. More air in = more gas in = more power out!
Hope this helps. Take care.

Answer 2

Same as any other.
There are Inlet valves and Exhaust valves.
12 valves could be a 2 valve per cylinger 6 cylinder,
or a 3 valves per cylinder 4 cylinder.
or more usually a 4 valve per cylinder 3 cylinder.
Quite why people use 3 valves per cylinder beats me, some used 2 inlets some 2 exhausts.
Yamaha even used 5 valves per cylinder on its Formula 1 engine but could not match the power of the 4 valve per cylinder Cosworth it was based on.
Anyway if it says 12 valve it is probably a 3 cylinder Corsa

Answer 3

On a 4 cylinder engine, you get 3 valves per cylinder. Either one inlet, and two exhausts, or one exhaust, and two inlets.
There have also been 5 valve engines in the past, giving a 20 valve setup on a 4 cylinder engine.

We get used to even numbers in engines, even numbers of cylinders and even numbers of valves, and yet some of the most powerful engines have been based on odd numbers of valves and cylinders.

Everyone has heard of a V6, yet a V5 engine is inherently smoother and more balanced than an even number V-engine. The same goes for a V8 engine.

VW/Audi quite liked the odd cylinder idea, and produced some very smooth and powerful engines with odd numbers of cylinders.

Answer 4

on a twelve valve, 4 cylinder engine you have 1 exhaust, output, and 2 intake, input, valves, the theory is that on the intake stroke, the piston creates a vacuum and thus air flows into the cylinder, so the bigger are that is opened in the cylinder the more air or air/fuel mixture is introduced to the cylinder. the piston creates pressure to expel the exhaust therefore the bigger area is not needed to allow the same amount of exhaust to escape. Hope this sheds some light.

Answer 5

12 valves came mostly on 4 cylinder diesel engines 2 intake and 1 exhaust per cylinder and on a few gasoline engines too.For example the 1990 peugeot 605 svdti came with diesel engine 2100 cc 3 valve per cylinder 2 intake and one exauhst Excelent engine by the way

Answer 6

I have a nissan 2.4 liter 4 cyl 12 valve two intake and one exhaust valves per cylinder. Two small valves iinstead of one large one are lighter and need weaker springs. The stiff springs and heavy valves need more power to operate so more small valves are more efficient to get the same flow

Answer 7

well a 12v engine would be three cylinders, each with 4 valves, vauxhall use this in the 1.0litre corsa, the turm u need is inlet and exhaust valves hope this helps

Answer 8

Two valves on the intake...one one the exhaust.

By the way...could Phish send me a photo of his V5 engine...I'd like to see how the cylinders are arranged :)

Answer 9

2 v for intake and 1 v for exhaust. usually the exhaust valve is larger than the intake valves in these engines. hope this helps

Answer 10

IT WORKS ON THE SAME PRINCIPAL AS ANY OTHER ENGINE. AS FOR THE VALVES IT ALL DEPENDS ON THE COMPANY THAT MADE THE ENGINE AND THE TIME PERIOD. iN THE 70S ON BACK THEY ALL HAD AN INTAKE VALVE AND AN EXHAUST VALVE. NOW SOME GOT THREE VALVES PER CYLDER AND SOME GOT FOUR.