I feel funny asking this but my curiosity is winning out:
Background: my car died on the backside of MidOhio so I pulled off into the grass near a corner worker. As I sat there it somewhat became apparent something in the engine area was on fire. I briefly contemplated the many consequences of setting off the fire system. One consequence being a face full of foam even though I wasn’t on fire. So I then considered putting my gloved thumb over the cockpit nozzle in the dash and setting off the system hoping it would just do the engine. I was afraid my thumb would end up hurt and still get a face full of foam. So I didn’t do anything. Got out and corner workers put out the little fire that was there. Just an ignition wire and breather hoses. If I had successfully set off only the engine area, I think the mess would have been about the same. Dunno.
But I’m curious, anyone try to block off a nozzle and set off the system? Successfully?