Best4x4xfar said:
You could try
firetrace..
Something else to consider is a fire bottle like they use in boat engine compartments. It would be highly advisable to rig up an experiment though to find out how high 'normal' under hood temperatures can get (you know under low speed, heavy load, high outside temperature conditions) before installing any type of automatic system, since they all are tripped by temperature exceeding a certain threshold. I'd be pretty concerned that 'normal' under hood temps might be higher than the trigger threshold though for boat style fire bottles like
Fire Boy (175 degree trigger) or
Sea Fire though (didn't see a trigger temp listed on the site), leading to discharge when not needed and an expensive paperweight.
Because these systems are designed for essentially sealed spaces, it would also be advisable to increase the standard capacity/per cubic feet of area to be covered to compensate for agent loss.
I also meant to include a link to the Fire Trace brochure for
Commercial construction equipment. Like Sea Fire, I can't find a spec readily on discharge temperature, but I would think it would be higher than the FireBoy systems. Another nice feature of the Fire Trace would be the ability to cover multiple areas with one system (think under seat boxes as well as under hood) because of the design. Neat stuff..