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vvishwaskumar
vvishwaskumar • Mar 6, 2011

carburetor unit.

now a days carburretors are not used in the vehicle and i jst want to know that which unit used in place of carburretors and how does it functions..??
Carburetors are not used. Fuel injection is a system for mixing fuel with air in an internal combustion engine. It has become the primary fuel delivery system used in automotive petrol engines, having almost completely replaced carburetors in the late 1980s.

Multi-point fuel injection injects fuel into the intake port just upstream of the cylinder's intake valve, rather than at a central point within an intake manifold. MPFI (or just MPI) systems can be sequential, in which injection is timed to coincide with each cylinder's intake stroke; batched, in which fuel is injected to the cylinders in groups, without precise synchronization to any particular cylinder's intake stroke; or simultaneous, in which fuel is injected at the same time to all the cylinders. The intake is only slightly wet, and typical fuel pressure runs between 40-60 psi.

Many modern EFI systems utilize sequential MPFI; however, in newer gasoline engines, direct injection systems are beginning to replace sequential ones.
ISHAN TOPRE
ISHAN TOPRE • Mar 11, 2011
Hi Praveen.Can you tell us the difference between a carburetter and fuel injection technique?
Let my dad come... I got the info from him... I will update you tomorrow.., 😀
raj87verma88
raj87verma88 • Mar 11, 2011
Carburettor
Basic function is to vaporise fuel (petrol) and mixing it with air in correct proportions, depending on engine requirement over a range of speed and load. It controls the mass of mixture entering combustion chamber. Many SI engines still use Carburettors.

Injection
Used in CI engines. Fuel is injected directly into combustion chamber through injection nozzles. Quantity is controlled through fuel control lever.
vignesh sp
vignesh sp • Mar 17, 2011
­T­he goal of a carburetor is to mix just the right amount of gasoline with air so that the engine runs properly. If there is not enough fuel mixed with the air, the engine "runs lean" and either will not run or potentially damages the engine. If there is too much fuel mixed with the air, the engine "runs rich" and either will not run (it floods), runs very smoky, runs poorly (bogs down, stalls easily), or at the very least wastes fuel. The carb is in charge of getting the mixture just right.


On new cars, fuel injection is becoming nearly universal because it provides better fuel efficiency and lower emissions. But nearly all older cars, and all small equipment like lawn mowers and chain saws, use carbs because they are simple and inexpensive.
ShrinkDWorld
ShrinkDWorld • Mar 24, 2011
can you explain why ethanol is added in to the petrol??
ISHAN TOPRE
ISHAN TOPRE • Mar 24, 2011
Yes.
1.Ethanol is cheaper than petrol
2.Ethanol and petrol blend gives an efficient mixture.

Any other reason anyone knows?
ShrinkDWorld
ShrinkDWorld • Mar 24, 2011
is ethanol combustible??? how much heat genrated by unit ethanol???

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