the differences in batch-fire and sequential efi hardware?

[cammeddrz]

obviously the wire harnesses and computers are different between the batch fire, and the sequential. but how does the hardware actually differ?

would a batch fire manifold/fuel rail run on a sequential computer? how about vice-versa? what are the differences between the manifiolds/fuel rails? any other parts that differ?

 

[adsm08]

I would think that the injectors, manifolds, rails would all work either way. It's really just a matter of the wiring and the program.

 

[feellnfroggy]

Doesnt a batch fire light off all cylinders at once for each spark plug lit or sumthing? Like all injectors and spark plugs activate each time a piston hits compression?

 

[igiveup]

Hello

Batch fire on 2.9l fires 3 then fires 3. and non-batch fire fires for each injector just before it fires the spark plug. My stang (5.0l) is multiport and fires each injector by itself before the spark is fired. Full size broncos are batch fire so it would be 4 and 4.

igiveup

 

[gwaii]

I would think that the injectors, manifolds, rails would all work either way. It's really just a matter of the wiring and the program.

this is correct.

Doesnt a batch fire light off all cylinders at once for each spark plug lit or sumthing? Like all injectors and spark plugs activate each time a piston hits compression?

in a batch fire,there are two sets of injectors.they each fire several times per cycle,totalling the proper amount of fuel for each intake charge.the ignition is just as it would usually be.sequential fires the injector once for each intake cycle,timed to match the intake valve openning.

batch fire pools the fuel on the intake valve,waiting for it to open.

 

[shane96ranger]

Doesnt a batch fire light off all cylinders at once for each spark plug lit or sumthing? Like all injectors and spark plugs activate each time a piston hits compression?

IIRC correctly, a batch will fire one side of the fuel rail, then the other. Sequential fires in each individual cylinder as needed. The batch should work on on anything, the combustion chamber would just have the fuel already there for a moment before it fired. One thing to remember is, you would be getting fuel in at least one cylinder while an intake valve would be open, which is why in the performance world it is less desirable.

EDIT: If you think about it, batch isn't much different than having a carb as far as the way the fuel is delivered in the combustion process.

 

[feellnfroggy]

in a batch fire,there are two sets of injectors.they each fire several times per cycle,totalling the proper amount of fuel for each intake charge.the ignition is just as it would usually be.sequential fires the injector once for each intake cycle,timed to match the intake valve openning.

batch fire pools the fuel on the intake valve,waiting for it to open.

It didnt take long to make all that clear. Ive had a few FSB probs I couldnt figure out that you just explained, too bad I dont have them anymore.

 

[shane96ranger]

batch fire pools the fuel on the intake valve,waiting for it to open.

Yeah, this is what I was referring to. I remember reading somewhere that some people prefer this because it allows the fuel to vaporize, and your engine runs cleaner and more efficient.

If you are running a supercharger or turbo, SEFI has a lot more benefits.

obviously the wire harnesses and computers are different between the batch fire, and the sequential. but how does the hardware actually differ?

would a batch fire manifold/fuel rail run on a sequential computer? how about vice-versa? what are the differences between the manifiolds/fuel rails? any other parts that differ?

BTW, is this a SBC you are referring to?

 

[cammeddrz]

shane, i'm not referring to sbc, sbf....or any engine in particular. i was hoping that whatever knowledge people had of either would surface

so if i cut through all of this.....there is no difference in batch vs sequential right? i figured as much. actually i knew it would work, i used to make money by taking the tbi'd camaroes and putting the tuned port manifolds on them, all i needed to do was splice the injector wires to the existing 2 (1 to each side of the engine)

so we know it will "work" but a sturdy enough cardboard box will "work" as a step-ladder, and there are differences between a step ladder and a box.

so the injectors are not located in different places? they are not different size injectors?no differences from the factory at all?

 

[feellnfroggy]

because it allows the fuel to vaporize, and your engine runs cleaner and more efficient.

QUOTE]

This I do know, pooling fuel does not vaporize better and does not run cleaner, quite the opposite. Fuel injectors run a high pressure to prevent pooling and assist atomization. Pooling fuel is like having dirty injectors and fuel dripping into the chamber it doesnt burn evenly through the cylinder. And everyone knows what unspent fuel causes.

 

[shane96ranger]

i used to make money by taking the tbi'd camaroes and putting the tuned port manifolds on them, all i needed to do was splice the injector wires to the existing 2 (1 to each side of the engine)

OK, this is what I was thinking you were asking about for the BII.

 

[gwaii]

so the injectors are not located in different places? they are not different size injectors?no differences from the factory at all?

as far as i know,the only differences were the minor changes made from one year to the next...there should be no equipment differences,except possibly injector size(in theory batch fire could use a smaller injector,as it gets the fuel in in several sprays,rather than just one)i don't know if this is the case-but the injector design is identical.there is no distinction when buying injectors what system is in place,just the size.

 

[Mac]

Okay, how about the Explorer 5.0L firing? Don't they fire also on the exhaust stroke, meaning twice per full cycle? Just something I think I remember seeing. Makes them run cleaner, need no smog pump and at least the 2000's dropped down to 17# injectors. Just more food for thought.
Dave

 

[igiveup]

Hello

as far as i know,the only differences were the minor changes made from one year to the next...there should be no equipment differences,except possibly injector size(in theory batch fire could use a smaller injector,as it gets the fuel in in several sprays,rather than just one)i don't know if this is the case-but the injector design is identical.there is no distinction when buying injectors what system is in place,just the size.

My brothers 88 Bronco had 5.0l in it with grey injectors. They were the same as my T-Birdbird was an 86 5.0l. I think they were 16 or 17 lbs injectors. The Bronco is batch fire, the Bird and my 88 Stang are multiport. The Bird had 160 hp and my Stang has around 240 hp. What does the Bronco have I am not sure. My way of doing it is if it looks the same and fits use it.

Okay, how about the Explorer 5.0L firing? Don't they fire also on the exhaust stroke, meaning twice per full cycle? Just something I think I remember seeing. Makes them run cleaner, need no smog pump and at least the 2000's dropped down to 17# injectors. Just more food for thought.
Dave

Didn't the trucks have less emission standards till the mid 90s?

igiveup

 

[bobbywalter]

on the eec 4 pin 58/59 is bank 1 bank 2 or

injector 1 and injector 2 on sefi.


bank is not 1234/5678 wich would be actual bank as in left side right side


its actually 1458/2367



on sefi its usually obviously the firing order



bank fire on the ford is single shot of juice per cycle for lopo....on the 351 lightening and custom tunes they double shot the injectors per cycle for some parameters.


on the eec4 fords the rails and intakes are the same, even the fuel pumps, regulators and lines.

i thought you wer talking about the hardware on the pcm board