Just a few observations here.... Although the fuel is injected directly BEHIND the intake valve, this does NOT qualify as DIRECT injection in my book.
Start like this: if the fuel is injected BEHIND the valve, it is also being injected INTO THE AIRSTREAM. And as such, is going to be somewhat mixed with air in short order.
To my way of thinking, direct injection means DIRECTLY INTO THE COMBUSTION CHAMBER. Not behind a valve. To me this indicates INDIRECT injection. No matter how they play word games, DIRECT means DIRECT. Period.
So, you mean to tell me that 50 million dollars of engineering, research, and development cannot solve this problem?? That doesn't say much for GM's engineering staff.
A word about BG - as far as I am concerned, most of their stuff is your basic "mechanic in a can" snake oil.
There still is nothing in a can that can fix a broken part, put material back onto a scored crankshaft, repair a scored bore, fix a burned valve, or otherwise overhaul an engine without turning a single wrench. My opinion based on over 40 years of fixing the darn things.
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