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Hi guys, so this fuel film is the fuel that is not inyected directly into the cylinders but at constant air speed it also evaporates right?
This happens mostly because is port inyection design? Is there a way to modify this? And if so, it´s worth it?
With direct inyection happens something similar?
Why some engine builders swap from D.I to Port inyection? Does it have anything to do with it?
I would appreciate any additional information or data on this. Greetings.
Fuel Film only applies to Port Injection, and with direct injection you (hopefully) combust all the fuel you inject. Some of the injected fuel clings to the port walls (this is the fuel film), depending on the manifold pressure the fuel film can increase or decrease, making the amount of injected fuel to be consumed either too much (richer than desired) or too little (leaner than desired).
This is not a reason that engine builders might switch to port injection. They would do it because -- they can't fit large enough direct injectors, or their preferred ECU (and tuning experience) doesn't support direct injection.
Here are some good webinars that might give you some more insight into what fuel film is and how to compensate for the change in fuel film volume (while specifically demonstrating how this is handled in 3 different ECUs):
https://www.hpacademy.com/previous-webinars/110-fuel-film-quick-set-up-motec-m1/
https://www.hpacademy.com/previous-webinars/233-haltech-elite-transient-fuel-tuning/
