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Thread: Is anyone setup to kill ignition with low oil pressure?

  1. #1

    Default Is anyone setup to kill ignition with low oil pressure?

    I have a Super Sniper, so I have three 0-5V inputs. I picked up a couple 0-100 psi transducers and plan to use one for fuel pressure and the other for oil pressure. It'd be really easy to kill ignition when oil pressure was too low (say below 15 psi?) for too long (say 5 seconds). PSI and time are just guesses, but the handles are there in the SW to set as desired. Anyone doing something similar? Pros? Cons?

    I guess the pro is protecting the engine. Cons include giving a $30 sensor the ability to shut the engine off. I'm not sold on this with my car, but I'm at least a little intrigued by the concept. Anybody doing this? If so, are you happy?

  2. #2
    Join Date
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    Will cranking the engine generate enough pressure to allow it to fire? You may need a workaround for that.

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    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  4. #4

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    Quote Originally Posted by Leon82 View Post
    Will cranking the engine generate enough pressure to allow it to fire? You may need a workaround for that.
    I thought about that. Not sure. Was thinking that maybe the timer might 'save' you here. The likelihood I do this is pretty dang low. It was more a curiosity as I was setting up the scaling and high/low warnings for my transducers and saw the stuff that you can do. I've seen engines live much longer than I think they should on very low oil pressure. Know a guy who had his pump pickup fall off his pump. At high RPM, he was sucking air so virtually zero pressure, at low RPM he had enough oil in the pan to feed the pump. He found the problem at the drag strip. When he pulled the engine apart to fix the pump, he checked all the mains and rod bearings. They were immaculate. If I wouldn't have seen it with my own eyes, I'd have called BS. Good oil is your friend.

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