[unclebilly]

Here are 5 data points that I can offer from personal experience…

1. We had a halon system in the chump 911. When an oil line blew during a 24 hour race at Spokane , we used it and it worked to extinguish the car with minor damage. We repaired the line and went back racing. I’m not sure any other system would have allowed for that.

2. My Miata and Ford have water based systems. We intentionally pulled the pin on the Ford after a race at Laguna Seca and it made a hell of a mess. We also determined we needed to re aim some of the nozzles.

3. I have a regular fire extinguisher in my Tundra behind the seat. You need to take these out and shake them periodically otherwise the powder settles on the low side and compacts itself from the gentle vibration of driving. At work we had fire extinguishers on all of our trucks and equipment. We found that in some cases, a fire extinguisher wouldn’t work when needed despite being fully charged. The propellant would come out but no powder.

4 & 5. I have had a powder extinguisher discharge twice in the cab of 2 of my vehicles on 2 miserable occasions. The first time was in my Dodge truck at a tractor pull even that I won’t with that truck in 2001. The second time was when I dropped my backpack onto the fire extinguisher in my Mack gravel truck. The weight of the back pack held the lever down… what a f’ing mess.