C4 injector firing??
Instructor
Joined: Jan 2013
Posts: 104
Likes: 1
From: Moriac Victoria
I've never understood how a batch fired engine even manages to run properly, let alone smoothly when either the left or right bank of injectors fire simultaneously regardless of whether the intake valve(s) are open or not?
So at any given time multiple injectors are spraying fuel onto the back of a closed valve(s) also without any airflow because the valve is closed?
Wouldn't you end up with fuel pooling on the closed valve waiting until it's opened before being sucked into the cylinder?...how does that affect atomization and efficient cylinder filling?
Sounds like a recipe for a very poorly running engine, and yet as I understand it this is exactly the way batch fired injection works
Am I missing something here?.....how is it possible for batch fired engines to actually run ok when fuel is being poured into ports before the firing order requires it?
Ken D
So at any given time multiple injectors are spraying fuel onto the back of a closed valve(s) also without any airflow because the valve is closed?
Wouldn't you end up with fuel pooling on the closed valve waiting until it's opened before being sucked into the cylinder?...how does that affect atomization and efficient cylinder filling?
Sounds like a recipe for a very poorly running engine, and yet as I understand it this is exactly the way batch fired injection works
Am I missing something here?.....how is it possible for batch fired engines to actually run ok when fuel is being poured into ports before the firing order requires it?
Ken D
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Your injectors #1, #2, #3, #4, #5, #6, #7 and #8 all fire at the same time (once per engine revolution, twice per ignition). The "bank fire myth" (as I call it) is a myth. See here:
http://forums.corvetteforum.com/c4-t...-debunked.html
As Bandit1977 brought up, it's amazing that these engines run as well as they do, considering the way they are designed. They were working with what they had back in those days when the microprocessors were a lot slower.
Yes, the injectors fire against the back of a CLOSED intake valve. Given that, I have always wondered why some people make such a big deal about injector fuel spray patterns and atomization.
I think it's weird that there is only one O2 sensor on my '86 and the ECM has no idea what's happening on the passenger side of the engine. I had a bad plug wire on #6 and the ECM went on its merry way like nothing was wrong. It couldn't see the problem.
http://forums.corvetteforum.com/c4-t...-debunked.html
As Bandit1977 brought up, it's amazing that these engines run as well as they do, considering the way they are designed. They were working with what they had back in those days when the microprocessors were a lot slower.
Yes, the injectors fire against the back of a CLOSED intake valve. Given that, I have always wondered why some people make such a big deal about injector fuel spray patterns and atomization.
I think it's weird that there is only one O2 sensor on my '86 and the ECM has no idea what's happening on the passenger side of the engine. I had a bad plug wire on #6 and the ECM went on its merry way like nothing was wrong. It couldn't see the problem.
