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Author Topic: cable thru chassis  (Read 5314 times)

Offline wideopen231

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cable thru chassis
« on: April 05, 2020, 03:00:04 PM »
 Going to have to ut remote power shut off on car,rules are rules. Would like to run thru upper right part of main hoop dow to fron of motor and to switch which is about 18" foward of motor.

Question is if I weld a tube in hoop just past radius and run cable thru it then exit in front of motor thru upper tube  and place a what ever you call the piece around opening to keep tube from failing.Have brain fart right now. Is that legal? I know spec stops at mid plate just wondering about opening in main hoop with tube welded into it.
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Offline rooman

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Re: cable thru chassis
« Reply #1 on: April 06, 2020, 05:49:07 AM »
With a doubler or tube welded for cable entry/exit it will still certify.

Roo
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dreracecar

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Re: cable thru chassis
« Reply #2 on: April 06, 2020, 08:19:43 AM »
On a customer car , I mounted the S-O switch to a plate and then used a solinoid (kicker) to punch the lever and just ran some 16ga wire to a button switch at the back of the car. Hit the button, solinoid hits the toggle, batteries disconnected, until manually switched back on.
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Offline wideopen231

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Re: cable thru chassis
« Reply #3 on: April 06, 2020, 05:48:05 PM »
was solenoid deal legal? I thought about same thing but figured not legal. Then I have to get s switch that kills mag and battery to be legal.LOL Besides for bracket deal if big tires in rear,skinny tires on front,car has diaper,driver has helmet and money you are good to go.
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Offline rooman

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Re: cable thru chassis
« Reply #4 on: April 07, 2020, 04:03:37 AM »
I usually run two cables from the shut off switch--one to the back of the car as required by the rules and another to the cockpit so that the driver can shut off the electrics there as well.

Roo
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dreracecar

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Re: cable thru chassis
« Reply #5 on: April 07, 2020, 10:07:45 AM »
Why would it not be legal??? Big red button at the back with the indicater sticker "push off". In fact should be mandatory in door cars with some sort of "G" meter or rollover switch that would kill the power ( fuel pumps) in the event of a crash. Who knows the condition of the driver and if he is able to get to the switches. Nothing like having a 25gpm fuel pump feeding a fire while you are upside down waiting for rescue to turn the power off.

 I used a standard S-O switch and a relay to the simple vertex magneto.  the only issue was that the solinoid Button should only be used for emergency S-O only and the switch should be engaged and disingaged manually . The solinoid really kicked the lever hard and with testing and many repeated hits, the S-O switch broke. you have to set the stroke length correctly as to not over travel

 The other reality was that this was a semi-chute tail car and really no place to mount a normal switch nicely . An industrial machine on-off switch mounted to the body and a wire disconnect. Didnt need to string 15ft of  #0 battery cable thru the car either
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Offline 225digger

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Re: cable thru chassis
« Reply #6 on: April 07, 2020, 10:38:20 AM »
chris, how did you have your setup and what was wrong with it?
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Offline wideopen231

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Re: cable thru chassis
« Reply #7 on: April 08, 2020, 03:46:07 PM »
Well lets just say nothing wrong with it,if there was a remote S O. Just done some testing is never hooked anything except the Master cut off switch it self. Hey its bracket car and around here.Big tires in rear,little tires in front,have diaper to protect track,a helmet and entry money.Go race.LOL
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Offline Supercat

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Re: cable thru chassis
« Reply #8 on: April 08, 2020, 06:25:39 PM »
My mag and power kill is on my small dash.
Clearly says flaming river kill switch.
I have only had one tech person (young kid) helping at tech say it was an issue.  He was overruled by the tech official.
I sit well behind the tires so it is easy to reach from anywhere at the rear of the car.
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Offline THE FRENCHTOWN FLYER

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Re: cable thru chassis
« Reply #9 on: April 09, 2020, 05:58:25 AM »
Quote from: rooman on April 07, 2020, 04:03:37 AM
I usually run two cables from the shut off switch--one to the back of the car as required by the rules and another to the cockpit so that the driver can shut off the electrics there as well.

Roo
I have done similar with an onboard master kill. At one time it saved a lot of spectators from injury when I had a very ugly accident. I was able to kill the runaway car while only half conscious before the safety crew got to me. Grainger sells a very stout robust modular switch. I will pull out the part number when I arrive home (I'm travelling now). It can be stacked in interconnected layers so some contacts are NO and some are NC (for mags). At Ford R&E we used similar buttons in each dyno cell - with a big red button. Everyone was instructed if anything catastrophic happens on a dyno run to "PUNCH BOZO'S NOSE!" to de-activate the entire dyno cell and kill the engine. LOL. My thanks to John Peto for recommending this switch installation. R.I.P. John.

Note the big red button below the steering wheel above the delay box.
(Also note the wiring routed through the chassis tubes.)
« Last Edit: April 09, 2020, 06:18:40 AM by THE FRENCHTOWN FLYER »
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