Term Paper Mpfi vs Carburetor

Only available on StudyMode
  • Download(s) : 749
  • Published : April 3, 2011
Open Document
Text Preview
2/4/2011
SUBMITTED BY :- | Anand PrakashRoll. No. RB4912-A03Reg. No.- 10903205| Term Paper
Engineering Thermodynamics
(MEC-203)
Submitted To:- Mr. Tukesh Kumar Soni

lpu| MULTI POINT FUEL INJECTION SYSTEM vs. CARBURETOR|

ACKNOWLEDGEMENT
This is to certify that the following term paper has been made by Anand Prakash of section B4912 on the topic “MULTI POINT FUEL INJECTION SYSTEM vs. CARBURETOR” under the supervision of our thermodynamics teacher Mr. Tukesh Kumar Soni sir.

I am greatly thankful to my teacher Mr. Tukesh Kumar Soni sir and sincerely pay my gratitude for providing me the guidance on the given topic.

ABSTRACT
Carburetors have been around almost as long as the car itself. Its functionality can be explained as a device that delivers the correct amount of fuel to the engine according to the air that is forced through the engine by atmospheric pressure. The initial cost of a carburetor engine is almost five times cheaper than an electronic fuel injected one, although maintenance costs could perhaps set one back a bit. The clear advantage of a carburetor engine is that it is not restricted by how much gas is pumped from the fuel tank. This means that any modifications to the cam in an attempt to make the engine "breathe better" will allow the cylinders to pull more fuel through the carburetor resulting in a more dense explosive mixture in the combustion chamber. The end result… unrivaled power!

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.

CONTENT
CARBURETORS.......................................................................................... ........page no.(4) MULTI POINT FUEL INJECTION SYSTEM (MPFI) .............................. .....page no.(8) ADVANTAGE OF M. P. F. I............................................................................... page no.(9) MPFI vs.CARBURETOR TECNOLOGY.........................................................page no(11). CONCLUSION.......................................................................................... ..........page no.(12) REFERENCE.......................................................................................... ............page no.(12)

CARBURETORS

* carburetors were used on most SI engines as the means of adding fuel to the intake air. The basic principle on which the carburetor works is extremely simple, but by the 1980s, when fuel injectors finally replaced it as the main fuel input system, it had evolved into a complicated, sophisticated, expensive system. * Carburetors are still found on a few automobiles, but the vast majority of car engines use simpler, better controlled, more flexible fuel injector systems. Many small engines like those on lawn mowers and model airplanes still use carburetors, although much simpler ones than those found on the automobile engines of the 1960s and 1970s. This is to keep the cost of these engines down, simple carburettors being cheap to manufacture while fuel injectors require more costly control systems. * Even on some of these small engines, carburetors are being replaced with fuel injectors as pollution laws become more stringent. Figure shows that

* the basic carburetor is a venturi tube (A) mounted with a throttle plate (B) (butterfly valve) and a capillary tube...
tracking img