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oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: Replacing Engine

Sun, 25 January 2004 09:36

oki, i apologise then Wink

Quote:

how will the injectors know to "inject" at correct time in engine cycle. Do they get a signal from the distributor or what?

in one sentence?? i'll try.

the vast majority of EFI cars use batch injection, either in a single bank, or in multiple banks, although some cars actually use staged injection, and some also inject mulitple times for each bank per engine cycle, and i believe that the 4AG has two squirts for each of two banks per engine cycle, but there are also a few systems out there that are "Truly Sequential", which means that the injectors are timed to fire at a particular angle of the crank, for each cylinder, that said tho, some "sequential systems" actually have less number of banks than cylinders, but still inject at a 'timed crank position' and call themselves sequential, even tho they are not really, but getting back to the original question, what do you mean by

Quote:

the correct time

????????, most engines will use either a toothed or magnetic pickup from the crankshaft (crank angle sensor), or a reluctor style pickup from a cam driven toothed wheel (cam angle sensor), or other will use the coil pulses and divide by number of cylinders to work out rpm, but even so, none of these sytems are "TIMED" as such, they just inject a certain number of times per revolution, based on the rpm, number of banks, number of squirts per bank etc, and this timing/rpm information is sent for the pickup to the ECU which then uses a number of other inputs, such as load (AFM/MAP), coolant temp, air temp, O2 sensor feedback etc, to determine the pulsewidth of each injector pulse, and then the ECU tells the injector to fire.

so to sum up:
1) wtf do you mean by "correct time"????
2) signal comes from either dizzy, or crank angle or cam angle sensors, or direct from coil pulses (tach)

all of this you should have found in 5 minutes, seriously.
Cya, Stewart

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