Drag Racing Discussions > Front Engine Dragsters

Fire System Nozzle Placement

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glofria:
I've seen this before. Always go with what the OEM says to do. Here is what DJ Safety says: http://djsafety.com/wp-content/uploads/2016/10/10-lbs.jpg

In the case of fire suppression more nozzles is not better, but rather worse. a large (more) orifice yields less pressure and a shorter duration. Hence counter of what it is suppose to do.

Secondly these these systems are design to put out oil fires not fuel fires. That is what the fuel shut-off valve does. If you want more put a second system in as others have suggested.

BTW, we still have a halon fire bottle in our car. We tell our drive hit that button on our way out of the car. Luckily have never needed it.

glofria:
That is one on either side of the frame rails under the headers shooting at the block and one for the driver shooting downward to his crotch area.

arush:
Appreciate the feedback Paul, Roo, Supercat and Glofria.
All valid points to consider.
I am know thinking one in the diaper, two at the front of the engine and two in the drivers compartment aimed towards my feet.
I was not planning on going with a split system but do understand your logic.

dreracecar:
You run a split system so that you dont dump two bottles if you hit one of them by accident. I have never seen a fire in the blown alc cars that we run in 25 years. I know of some racers that have one of the 10# blocked off and carry it as a spare just in case the first goes off and does not have to go find a replacement. If you hook up both, make sure you go out and spend another $700 on a spare set of bottles to keep in the trailer so that the SFI expires before you use them.

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