Drag Racing Discussions > Front Engine Dragsters

battery disconnect with mag kill

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George:

--- Quote from: wideopen231 on January 25, 2016, 02:52:28 PM ---Car will have battery for starter,delay box, ttraqns brake ,gauges,tail light and driving lights for those tracks with dark shut down and return roads.

Relay would require more wiring than the flamming river piece.My cut off is right in front of engine,batter infront of front axle and cable out rear.Matter of fact cut off is less than foot from mag box.Down side flamingriver unit is about 100 more than normal shut off. Oh well the price you pay for the way we love to play
[/quot

We have run the Flaming River switch for several years without a problem. A full size battery is  in our nose piece and powers all you have described for your build. A push/pull cable connects the switch that is mounted to the side of the Powerglide and a handle mounted to the rear of the car ( PUSH OFF).
--- End quote ---

Van:
This is a very interesting thread. When I brought out my new FED to Bakersfield I was told that the switch must be controlled from the rear, so we drove to town and bought welding cable and moved the switch to the rear. When we tried to go back through Tec the second time we were told OK you can make a few short hits today but don't come back again until the switch is located on or at the battery. No cable allowed to travel any distance before the switch. The battery is at the front axle, switch mounted on the battery and Morse cable running the full distance to the rear = push pull and required decal for off. It was explained this way, Having a live cable traveling any distance that is still live after the switch is off endangers the safety crew that might be trying to get the driver out of a wrecked car. Don't do it and if you did, fix it now.

wideopen231:
Not sure about it mounted to battery rule.I have seen tons of RED's with battery mounted nose or midway with disconect near rear of car.Not saying it is not just I have not seen it writen and diffently not enforced around here if it is.

wideopen231:
Just read heritage series rule and found nothing about switch location.Only that a shutoff must be located at rear of car. and cable sizes are specified.

Draw 3D:
From 2015 HRHS rule book:
--- Quote ---8:4 MASTER CUTOFF
Mandatory when battery is relocated, or as outlined in Class Requirements. An electrical
power cutoff switch (one only) must be installed on the rearmost part of each vehicle and
be easily accessible from outside the car body. This cutoff switch must be connected to the
positive side of the electrical system and must stop all electrical functions including
magneto ignition. The off position must be clearly indicated with the word “OFF.” If switch is
“push/pull” type, “push” must be the action for shutting off the electrical system, “pull” to
turn it on. Any rods or cables used to activate the switch must be minimum 1/8-inch
diameter. Plastic or keyed switches prohibited. Switches and/or controls must be located
behind rear wheels on rear-engine dragsters.
--- End quote ---
I use a relay to kill the mag when power is off.

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