I understand the concept that DI is the source of moving the bcg. What confuses the issue is that chamber deposits are clear evidence that the gases also exhaust from the action end of the barrel.
For them to have no effect would be from timing delayed enough to have no propulsive force against the bolt. My anecdotal impression is that blowback on the bolt still occurs and is a factor, regardless of what the action is.
It's hard to conceive there is no effective propulsion at all in DI when the same force is the actual method of cycling in other firearms. Taking advantage of it through appropriate timing would be more efficient.
A blowback or roller lock delayed firearm is cycled exclusively by propulsion from gas pressure against the bolt face. Having DI simply unlock the bolt at the appropriate time would be sufficient. Changing port sizes will certainly affect the amount of gas flow, but it also changes the timing pulse.
I appreciate the concern that DI may be depicted inaccurately, which is why I hoped someone would come in with data and time pressure graphs to illustrate. I sell auto parts and constantly deal with questions from a completely uneducated public. I'm no stranger to the concept that "Just because I say so." lacks sufficient detail to communicate information. I explain it anyway, and sometimes get something across. I also know I don't know everything, and to question common assumptions, like "that's the way it is."
Raising questions about how the DI system works has shown me it's not the jammomatic many believe it to be, including myself. While of limited value to the public, how it works exactly is beneficial knowledge, just like understanding that you can't charge a battery fully in less than an hour. More like twelve. Having the right operating concepts makes related decisions more appropriate.
Let me get this: DI has no related gas propulsion affect on the bolt face at all?


Reply With Quote

Bookmarks