Help design a driver accessible master power cutoff!
#3059112
07/14/22 08:00 AM
07/14/22 08:00 AM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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At this point i am sorting out the best way to build a driver accessable power cutoff. Would like ideas that incorperate easy acsess by driver, main focus on panic situations.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Help design a driver accessible master power cutoff!
[Re: FastmOp]
#3059126
07/14/22 09:06 AM
07/14/22 09:06 AM
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JERICOGTX
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https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/2892544/Searchpage/2/Main/237596/Words/%2Bcutoff/Search/true/re-inside-car-battery-shut-off.html#Post2892544
69 GTX
68 Road Runner
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Re: Help design a driver accessible master power cutoff!
[Re: '72CudaRacer]
#3059129
07/14/22 09:32 AM
07/14/22 09:32 AM
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justinp61
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Use a cable and handle, like a parachute or a fuel injection cut off lever.
Brian This is the simplest way. My buddy does it and puts the lever on a bracket just to the right of the seat on the floor. The lever stands straight up within easy reach.
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Re: Help design a driver accessible master power cutoff!
[Re: justinp61]
#3059140
07/14/22 10:11 AM
07/14/22 10:11 AM
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Joined: Jan 2003
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gregsdart
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My battery and master cutoff are both up front. Battery in front of radiater, switch on passenger side frame rail to right of radiater. I use a long morse cable to back of car. I will figure out how to bolt to the morse cable at the switch, then run the new cableback to the shifter area or up overhead by the parachute lever. Going up the side of the roll cage and mounting it by the roof/ parachute release seems to be about my best option?
Last edited by gregsdart; 07/14/22 10:22 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Help design a driver accessible master power cutoff!
[Re: Clanton]
#3059159
07/14/22 12:03 PM
07/14/22 12:03 PM
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Joined: Dec 2005
Posts: 11,521 Fulton County, PA
CMcAllister
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Mr. Helpful
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You already have all the hardware mounted in the car. No need to redo it if it works. Just piggyback a Morse cable into it.
I'm doing this on just about everything I get involved in. Just makes sense to be able to run it from the drivers seat for so many reasons.
If the results don't match the theory, change the theory.
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Re: Help design a driver accessible master power cutoff!
[Re: CMcAllister]
#3059195
07/14/22 01:47 PM
07/14/22 01:47 PM
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gregsdart
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It does make sense for sure, McCalister Al, looks great. Clanton, that button was my first thought. No better deal than something you can slap quickly. I was thinking use a Ford starter relay, so not much juice required going through the button.
Last edited by gregsdart; 07/14/22 01:52 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Help design a driver accessible master power cutoff!
[Re: Cab_Burge]
#3059255
07/14/22 05:19 PM
07/14/22 05:19 PM
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dvw
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Morse cable on mine. The rest are just scrap tune and plate fabbed up. Lever is attached at the roll cage. Doug
Last edited by dvw; 07/15/22 08:08 AM.
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Re: Help design a driver accessible master power cutoff!
[Re: gregsdart]
#3059296
07/14/22 08:58 PM
07/14/22 08:58 PM
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Joined: May 2011
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Clanton
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It does make sense for sure, McCalister Al, looks great. Clanton, that button was my first thought. No better deal than something you can slap quickly. I was thinking use a Ford starter relay, so not much juice required going through the button. I was going to look on Amazon or some local to get the button.I think I am going to use this fastronics 305-040 50 amp push pull button.17$
Last edited by Clanton; 07/14/22 09:20 PM.
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Re: Help design a driver accessible master power cutoff!
[Re: B1MAXX]
#3059398
07/15/22 01:12 PM
07/15/22 01:12 PM
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Joined: Dec 2005
Posts: 11,521 Fulton County, PA
CMcAllister
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For those that run cables are those even legal? Have you ever had it commented on at tech? My NHRA rule book states all rod or cable must be of 5/16 diameter most of those look like 1/4 or less. Or is it the fact that the cable is just ancillary make it not relevant. I just looked at this rule for one of my cars I was working on a couple weeks ago. Using a shifter cable would be easier plus I have them laying around,but they aren't 5/16. The rule book is concerned with safety people being able to shut everything down at the rear of the car, in the event of a crash.. Beyond that, they won't or shouldn't care. If you back into a wall at speed and tear it all up, probably doesn't matter if you have a cable or rod at that point. Dragsters have had the master switch up by the battery forever, with a cable to the rear of the car to operate it. High amp remote relays are becoming common now with the pushbutton/mushroom head switches being used to control them. Takes some specific switches and wiring to be able to control it from 2 locations - unless you use your old master switch set up to control the relay, rather than to function as the high amp connector. Modern and Speedwire and others offer these systems.
If the results don't match the theory, change the theory.
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Re: Help design a driver accessible master power cutoff!
[Re: B1MAXX]
#3059412
07/15/22 01:41 PM
07/15/22 01:41 PM
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440Jim
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Using a shifter cable would be easier plus I have them laying around,but they aren't 5/16. Most of the shifter cables I have seen are only 3/16" (#10 threaded end), but the outside of the sheath may be 5/16 or 3/8". Many shifters are harder to move then the electrical main cut off switch. The rule is the rule, I can't change that. IMO, a 3/16" rod 12" long is not stiff enough, but a 3/16" morse cable with thick outer sheath is strong enough (if I was making the rule). A 30 series Morse cable has #10-32 ends A 40 series Morse cable has 1/4" ends. I like the comment about it being a secondary mechanism.
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Re: Help design a driver accessible master power cutoff!
[Re: CMcAllister]
#3059417
07/15/22 01:49 PM
07/15/22 01:49 PM
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Joined: Aug 2003
Posts: 43,112 Bend,OR USA
Cab_Burge
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The older Mr. Gasket and Moroso battery cutoff switches weren't rated very high on much current they can safely handle, I wore one out and learned that they are rated less than 100 amps There are better ones available, I bought one rated at 250 Amps and it worked great so can you find one to buy when you do a search Sorry for no links or company names: blush:
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Help design a driver accessible master power cutoff!
[Re: Al_Alguire]
#3059425
07/15/22 02:19 PM
07/15/22 02:19 PM
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Joined: Sep 2003
Posts: 421 montana
BANDIT
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My door car has one like Al's, except there is a parachute lever instead of a knob. Works great, and Tech inspector has not said a word.
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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