Drag Racing Discussions > Front Engine Dragsters

battery disconnect with mag kill

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H.G. Wells:
When my car was configured with a battery I used a morse cable at the rear to activate the shut off that was located at the front of the motor, between the starter and the battery. 

The relay was only used to ground the mag and was a very simple deal. As long as the power was feeding the relay the circuit to the mag was open. When the power was shut off to the relay the relay sent the mag to ground.

JrFuel Hayden:
Tech has never said we had to have a shut-off in our Heritage JrFueler, even when Good Guys was running JF.
No doubt because we don't have an on-board starter battery, just a one pound battery to run the RacePak, trans brake, tail light, and shift light.
 We use a Hayden, light weight [ 10 lb] remote 24 volt battery pack to start the engine.  24 volts is needed because we need to spin the motor fast enough for the 20 amp MSD mag and the 16;1 compression.

Jon

wideopen231:
Yea if was running headup deal i would not have battery onboard.Since its mostly bracket deal using starter pack is not option.Never who will or will not be there when racing. Hey leaving battery,cable and switch out would save a bunch of weight and maybe some cost.

  Going with 16v battery setup.Better than one 12 and lot less weight and cost than 2-12v.Only 13:1 but the 4.5" arm doesneed help getting spinning for mag.

dreracecar:
On a customers car in order to keep the cables short, I mounted the shutoff close to the battery and made a plate to mount a shifter solinoid (kicker style) and ran some 16ga to the back of the car with a machinery kill switch.  Manually turn the switch on and off to save from hammering the shutoff, but in an emergencey hitting the rear switch energizes the solinoid and bumps the shutoff to kill all battery power including the solinoid. Tried to get NHRA to look at this for door cars where it would also include a roll-over switch so in a crash and the car gets upside down the fuel pumps would be shut down and the power killed before the car even stops crashing

Van:
Bruce's Setup is great and accomplishes what Tec at Bakersfield want to see. I will use this on my Altered that I am building. I am thinking a door lock solenoid to trip the switch should do it.
 Thanks Bruce
 

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