Multiple fuel injectors

[SomptingGuy]

Don't ask why I'm asking this, but...

Can anyone point me to an example of a port injected gasoline engine that uses more than one injector per port? These may be in series (i.e. one before the other) or both located the same distance from the intake valve.

- Steve

 

[patprimmer]

Steve

Unfortunately your OP was not that specific.

Now that you have specified, many of the above posts could be considered off topic from this point on.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers for professional engineers

 

[SomptingGuy]

... nevertheless, the replies have all been interesting and educational, so thanks to all.

- Steve

 

[Thecardoc]

Mazda Rotary engines used two injectors for years. One injector, the primary fed fuel all of the time. The secondary injector (the ones that were easy to see) only fed fuel under load, and when the intake runner control system was activated.

The Lexus system uses a typical intake runner injector, and the second injector is a direct injection system ( direct into the combustion chamber). This system makes use of a "stratified charge" for improved performance and emission standards.

One thing that never seems considered strongly enough is exactly how a technician is supposed to analyze a problem when a problem with a system like this finally occurs. I can easily envision individual cylinders suffering a fuel density missfire and only under specific engine load conditions. Which could mean, no way for the tech to re-create the conditions in the bay, and nothing but intuition to rely on for figuring out the problem with a customers vehicle. Sure some will say on-board diagnostics will show us what cylinder is miss firing and when, but truly almost everything else about the failure will be completely unknown. That amounts to too many variables that can only be worked through in lab type settings, where time isn't a factor. Meanwhile a technician is expected to diagnose the problem in a flat period of time, and then repair the circuit or change a part and always be correct the first time. That's a standard that if put to the test, NO-ONE could ever completely live up to.

 

[havok91]

"A comment like octane on demand does slightly less than zilch for their credibility."

So running 91 oct from one fuel cell on one set of injectors, and 116 from another fuel cell to the other set indicates, what, zilch on their credibility?
They may not be degree certified engineers, but their ingenuity is commendable - maybe not their tagline. I only quoted what they say.

Take a look at their products and then give an opinion.

Nevertheless, to run those injectors, if I remember right, they use Electromotive's TEC³. The guy wanted examples of engines running multiple injectors. DON'T be so quick to judge.

 

[patprimmer]

If they said that it had 2 fuel tanks, it was certainly well hidden amongst the smoke and mirrors.

I just wasted another half hour not prejudging the Lets get edjumacated video. As expected after seeing the gloss and glitter preceding it, it was kindergarten level with a Las Vegas façade.



Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers for professional engineers

 

[Torquey]

I don't know if this is helpful but the 2003-2006 Ford GT had 2 injectors per cylinder on it's 5.4L dohc supercharged motor.

 

[pokeytemplar]

In the aftermarket world look at the Big Stuff 3. It has the ability to control 16 injectors and in a V-8 or less provide staged injection. Once the first stage hits 80% duty cycle (or whatever you decide) the second set picks up the slack.