Could you tell me the process for the fuel injection Vortec V6 air to fuel mixture. How is the fuel injected to the cylinders. Sorry stupid question but I want to prove a fact!
Thanks for your input
Adam O

 

For fuel delivery and not the actual calculation of the injector pulse width? I'm going to assume for just fuel delivery.

Well that depends on the year you are talking about.

The term Vortec was first given to the CPI(central port injection) motor used between '92 and '95 (IIRC). This motor has fuel supplied by the fuel pump plumbed into the intake manifold to the CPI injection spider. A fuel pressure regulator maintains the pressure at 55-60psi, directing any excess fuel to the return line where it goes back to the tank. The CPI spider has 1 batch fired electronic fuel injector feeding 6 pressure actuated poppet nozzles located in the 6 intake runners directly before the cylinder head.

The SCFI(sequential central fuel injection) motor was used between '96 thru '05. This motor used much the same setup, but instead of a single batch fired injector, the SCFI spider uses 6 individual sequentially fired injectors in a common housing. These 6 injectors fired precisely when necessary for each individual cylinder. They fed fuel through lines to pressure actuated poppet nozzles, much the same way as the CPI motor's single injector did. In '02, the SCFI spider was updated to a true MFI spider, moving the electronic injectors out to the intake runners, doing away with the problematic poppet nozzles. The MFI spider is a direct replacement for the older SCFI spider.

I hope that's what you were looking for... If not, I can get into the specifics (as I understand them) of how the computer determines the proper injector pulse width if you'd like...