why theres a flame comes out from the exhaust pipe? specialy on turbo cars..?

Answer 1

The flame at the exhaust is unburnt fuel igniting in the exhaust. This can happen for a number of reasons. Blow off valves can do this depending on how they're set up. Most people vent their blow off valves to atmosphere because it sounds cool. What is actually happening is that air that has been metered is not going to the cylinder. The amount of fuel that is needed for combustion will still be sent. The engine will run rich and a larger than normal amount of unburnt fuel will flow out the exhaust. Heat mixed with the oxygen at the exhaust will cause the ignition of the unburnt fuel.

And to naresh, please don't answer questions you don't understand. Turbo cars do not use an alternate fuel supply. They don't use nitrous oxide fuel either. Nitrous oxide is used because it's a way to get more oxygen into the combustion chamber. While nitrous oxide (nitrous oxide fuel does not exist) can produce power, it doesn't have anything to do with turbo cars specifically.

Edit - ncjay08 is incorrect in saying that the wastegate opens when the throttle is closed. The waste gate is opened when boost pressure exceeds the spring rating in the wastegate acuator. I think he's confusing a wastegate and a blow off valve (which does what he described).

Answer 2

WOW, what a ton of crappy answers. On race cars when you lift off the throttle at high speed the carburetor is still dumping a little excess fuel into the engine. Years ago, this was really common on most types of race cars. Nowadays, not so much. On a turbocharged engine the wastegate opens when you lift off the throttle to bleed off the excess pressure that the turbo has built up. When the wastegate opens a litttle excess air/fuel mix is dumped. I used to love watching the old GTP cars run in the 80's and 90's where they would shoot some pretty big flames under braking. Today with computer controlled engines and all the new technology, it's not so common to see. Even in some Nascar races, you might see a few cars shoot a little flame under braking, but most don't.

Answer 3

It is overflow from the exhaust pipe. It looks really cool on short tracks when they are rounding the corners, but it is just overflow from the exhaust burning off that excess fuel.

Answer 4

Excessive accumulation of the carbon in the exhaust pipe is the reason for this. Better have it cleaned immediately as otherwise you will be in trouble.

Answer 5

turbo cars have alternative fuel supply, and use nitro boost(nitrous oxide fuel)......this has more calorific value and gives more energy supply to the cars engine.....usage of this causes a small flame like thing from the exhaust

Answer 6

Motor oil may mix into petrol and air mixture . I mean if you put too much motor oil to your car more than required level . And second reason may be a problem about firing system . Check it.