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Old 08-28-2011, 11:06 AM   #1 (permalink)
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Question How to kill a 5.3L when rolled over?

A buddy of mine asked me yesterday if there's any way to make a Vortec 5.3L shut itself off if the buggy ever rolled over. I couldn't answer him but now he's got me thinking.

He has a tired & leaking Dodge 318 and SM465 in his trail buggy that's getting replaced with a drive-by-cable 5.3L truck engine and NV4500. One of the challenges of this swap is to get the engine to kill itself *preferably* automatically if it ever flips over. Any ideas or experience in this?
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Old 08-28-2011, 11:13 AM   #2 (permalink)
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Quote:
Originally Posted by Rinkrat456 View Post
A buddy of mine asked me yesterday if there's any way to make a Vortec 5.3L shut itself off if the buggy ever rolled over. I couldn't answer him but now he's got me thinking.

He has a tired & leaking Dodge 318 and SM465 in his trail buggy that's getting replaced with a drive-by-cable 5.3L truck engine and NV4500. One of the challenges of this swap is to get the engine to kill itself *preferably* automatically if it ever flips over. Any ideas or experience in this?
IIRC fords have a roll over switch in the passenger kick panel. Might be a good place to start. Or turn the key off
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Old 08-28-2011, 11:18 AM   #3 (permalink)
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IIRC fords have a roll over switch in the passenger kick panel. Might be a good place to start. Or turn the key off
It can be triggered by an impact so no good for this.
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Old 08-28-2011, 11:20 AM   #4 (permalink)
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It can be triggered by an impact so no good for this.
He said roll over not impact
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Old 08-28-2011, 11:32 AM   #5 (permalink)
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ive seen that ford switch kick off when a shelby gt500 did a launch, dont use that route.

some newer GM suv's have a rollover sensor factory equipped, i would do some research on that.

or just use a tether like quads and jetskis do.
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Old 08-28-2011, 11:49 AM   #6 (permalink)
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Do 5.3 have an oil pressure sensor like the injected 5.7 engines? When a 5.7 sees less than 7 lbs oil pressure the engine shuts off. Neither engine makes good oil pressure inverted.

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Old 08-28-2011, 12:27 PM   #7 (permalink)
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Turn the key.
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Old 08-28-2011, 12:31 PM   #8 (permalink)
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Turn the key.
This option works for me, but there are other less experienced drivers who drive this buggy who would be more shocked at rolling over than in the right frame of mind to preserve the engine.
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Old 08-28-2011, 01:01 PM   #9 (permalink)
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I have also seen a Mustang roll over sensor get triggered by a rear end collision. Might not be what you're looking for.
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Old 08-28-2011, 01:05 PM   #10 (permalink)
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Old 08-28-2011, 01:09 PM   #11 (permalink)
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Why would they non recomend for off road? Seems like a great thing to have.
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Old 08-28-2011, 01:12 PM   #12 (permalink)
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Why would they non recomend for off road? Seems like a great thing to have.
Shit, I buzzed right over that. Might be finicky with 4x4s bouncing around?
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Old 08-28-2011, 01:13 PM   #13 (permalink)
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You need an oil pressure shut off switch, when the motor loses oil pressure (from the pump not picking up oil in a rollover) it shuts the ignition and the fuel pump off, I just put one on my truck. I got it from summit, the part number is sum-g1438
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Old 08-28-2011, 01:29 PM   #14 (permalink)
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You need an oil pressure shut off switch, when the motor loses oil pressure (from the pump not picking up oil in a rollover) it shuts the ignition and the fuel pump off, I just put one on my truck. I got it from summit, the part number is sum-g1438
this....the mustang rollover switches suck i jumped one a couple of feet and it triggered the switch
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Old 08-28-2011, 01:54 PM   #15 (permalink)
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I wouldnt install a rollover switch, it could shut-off because of a bump or something and cause a dangerous situation. Especially if the rig has hydraulic steering. If you want to drive a buggy, your just gunna' have to learn what to do.
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Old 08-28-2011, 02:01 PM   #16 (permalink)
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You need an oil pressure shut off switch, when the motor loses oil pressure (from the pump not picking up oil in a rollover) it shuts the ignition and the fuel pump off, I just put one on my truck. I got it from summit, the part number is sum-g1438
this is my vote^^^. it may need to be wired like the factory TBI's that had this setup with a bypass to run the fuel pump during engine cranking, or you may run into engine starting issues.
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Old 08-28-2011, 02:02 PM   #17 (permalink)
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I wouldnt install a rollover switch, it could shut-off because of a bump or something and cause a dangerous situation. Especially if the rig has hydraulic steering. If you want to drive a buggy, your just gunna' have to learn what to do.
I agree with this, but I wouldn't go without something to shut the engine off in a
rollover situation. The oil pressure switch which I previously stated would be great. Just think if you rolled over and a fire started and your fuel pump just kept adding fuel to the fire... that would be a bad day. My fuel cell wont spill any fuel after it rolls over due to the check valve and the fuel pump shutting off.
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Old 08-28-2011, 02:05 PM   #18 (permalink)
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this is my vote^^^. it may need to be wired like the factory TBI's that had this setup with a bypass to run the fuel pump during engine cranking, or you may run into engine starting issues.
You do have to have a murphy (override) switch to start the vehicle and on uneven terrain, like lets say a off camber hill when the pump may not pick up fuel for a few seconds. I have mine on a push button on the dash.
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Old 08-28-2011, 03:43 PM   #19 (permalink)
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Do 5.3 have an oil pressure sensor like the injected 5.7 engines? When a 5.7 sees less than 7 lbs oil pressure the engine shuts off. Neither engine makes good oil pressure inverted.
Yes, yes they do. Unless someone screws up the cal in the ECM it will self protect the engine.
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Old 08-28-2011, 10:09 PM   #20 (permalink)
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The Gen II's LT1 add the oil pressure shut off. I am not sure why GM didn't do this with the LS motors. I have heard from a mech at a local dealer about a guy changing his oil and hit the remote start when he went into the house and burnt up the motor with no oil in it.

The oil pressure switch would work and you could wire it to the the fuel pump relay ground and have a manual switch to override it during start then arm it for driving it. Be easy and cheap.

The painless setup is probably not for off road cause if you climbing a hill and lost oil pressure the motor would die and you lose power. But if you had a accumulator it would be fine then in a roll over you would exhaust the oil in it and still kill the engine might take a min or two to finally die but it would.
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Old 08-29-2011, 05:35 AM   #21 (permalink)
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The oil pressure cut off is a good idea but becomes one more thing to fail. Whats wrong with a good old kill switch. Wire it in line with the RUN/KOEO circuit of your ignition switch. It should be big, like the Easy Button and say KILL or something comical like Oh' Shit or Oops. If people are too dumb to turn off someone elses rig after they roll it.....dont let them drive it.
Any on ever ran a SCAG walk behind mower?
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Old 08-29-2011, 06:12 AM   #22 (permalink)
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The oil pressure cut off is a good idea but becomes one more thing to fail. Whats wrong with a good old kill switch. Wire it in line with the RUN/KOEO circuit of your ignition switch. It should be big, like the Easy Button and say KILL or something comical like Oh' Shit or Oops. If people are too dumb to turn off someone elses rig after they roll it.....dont let them drive it.
Any on ever ran a SCAG walk behind mower?
I agree with this it would be a very good idea vs the oil pressure switch. Kinda like the "Easy Button" haha
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Old 08-29-2011, 06:48 AM   #23 (permalink)
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Turn the key.
I had a few keys on the keyring that the ignition key was on. When I rolled the centrifical force of the roll ripped the ignition key out of the ignition (it could have, just as easily busted the head off of the key). No way to turn the key to the OFF position as it was gone. Someone finally handed me a screwdriver.

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this is my vote^^^. it may need to be wired like the factory TBI's that had this setup with a bypass to run the fuel pump during engine cranking, or you may run into engine starting issues.
I'm running a 4.3L TBI that I haven't deleted ANY sensors on (running a full harness) and, I can tell you this, it will run just fine upside down. Don't count on the Oil Pressure sensor to shut the fuel pump off.
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Old 08-29-2011, 07:31 AM   #24 (permalink)
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Turn the key off or put a toggle between the 12v switched stuff and the 12v switched power source that will kill it quick.
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Old 08-29-2011, 08:23 AM   #25 (permalink)
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Turn the key off or put a toggle between the 12v switched stuff and the 12v switched power source that will kill it quick.
This. Toggle switch.
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