The,Fuel,Injection,about,Carbu car The Fuel Injection about Carburetor (3)
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The Case for Fuel InjectionIf youre not so concerned about traditionwhen building your next hot rod or custom project and the thought of tuningmultiple Strombergs every other weekend doesnt whet your appetite, then goingwith electronic fuel injection may be for you. Although cost and complexity aregreater than with carburetors, even on a car like 1928-34 Ford, there are manybenefits of going with EFI. For starters, once the engine and fuel system havebeen fitted and tested, they require minimal maintenance. Problems associatedwith carburetors, including rough idling, cold weather starting and excessivelyrich mixtures are virtually eliminated, because EFI systems allow for a muchmore precise fuel delivery which is exactly tailored to the amount of airentering the engine. The reasons why fuel injection has becomeso widespread, at least from an OE standpoint, go back to emissionsrequirements instigated in the 1970s. In order to reduce the output of harmfulexhaust gases, more precise control and metering of air/fuel mixtures wererequired. In order to successfully achieve this, oxygen sensors, placed in thetop of the exhaust stream, relay the level of O2 passing through back to anelectronic engine control module, which then precisely adjusts the air/fuelratio in real time. Also known as closed loop control, this requires moreprecise fuel delivery, simply not possible with carburetors and theirrelatively crude fuel jets and air flow control. As a result, fuel injectioncame to the forefront. Early systems used injectors placed atop acentral hole in the intake manifold (much like a carburetor), but have beensupplanted by sequential injection which completely separates the air and fuelpaths, drawing the former in through the top of the engine via a throttle bodyand a manifold with individual intake runners and then squirting the fuel invia a rail linked to individual injectors for each cylinder at the bottom ofthe manifold. Because of the need for more precise fuel delivery, much greaterfuel pressure is required (usually between 40-45 psi versus 8-9 psi forcarbed systems); hence EFI systems use high pressure lines and a high volume,electrically-operated pump, often with a main and return fuel line (that drawsexcess fuel back to the gas tank). The pump can be externally or internallymounted, but for quieter operation and reduced maintenance, pumps mounted inthe tank itself are becoming increasingly popular (the fuel also cools the pump,extending operating life). Getting the Right ComponentsWhen it comes to building a hot rod orcustom with electronic fuel injection, choosing the right donor car iscritical. Central to the EFI system is the engines electronic control modulewhich, via air intake temperature sensors, throttle position sensor andmanifold absolute pressure sensor, precisely monitors the flow rate of air intothe engine. Using this data, the ECM consults its internal look up tables tomatch the flow rate of fuel to achieve the Stochimetric ideal of 14 parts airto 1 part of fuel. When youre considering EFI, you need to get your hands on acomplete system, ECU, wiring harness, fuel rails and injectors, plus determineif youll need new fuel lines, fittings and an electric fuel pump. Find out more about Proton Saga carburetor byvisit miparts.com.
The,Fuel,Injection,about,Carbu