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Author Topic:   oil pressure warning light/switch
Dirt Freak

Total posts: 417
posted March 24, 2003 02:04 PM UIN: 13209501
Ok, we are running an oil pressure light this year, and I have a question. Has anyone ever rigged this up to where if it is activated, it would kill the car? Obviously it would have to have a manual bypass to start the car, but it seems to me this could be a good safegaurd, especially for a somewhat inexperienced driver. Does anyone have an opinion on this? Thanks!


Dirt Freak

Total posts: 353
posted March 24, 2003 02:29 PM
I know it can be done but I would be concerned with what might happen on the track if the switch malfunctions or for some reason the pressure dips low for a second or two and it kills the engine. Could cause a control problem when the driver least expects it.

I would run the light and put it where the driver can see it easily. I have seen some guys with 3-4" diameter lights on their dash to make it more noticeable.

Dirt Freak

Total posts: 417
posted March 24, 2003 02:47 PM UIN: 13209501
Yeah, we have the light is an easy to see place, but our driver is quite inexperienced and had trouble even telling me how many rpm's he was turning last year. I know by the time he could hit the switch if there was any sort of a problem the engine would be toast. Maybe he will just learn how to read the gauges better. It is just an idea I have been playing around with. Any other thoughts? Thanks.


Dirt Full Roller

Total posts: 64
posted March 24, 2003 02:49 PM
I'm gonna admit something that I shouldn't : When the racing gets really good, the last thing I am looking at is the gauges. I've been pondering a "audiable alert" - where I would run an earpiece inside the helmet with either a buzzer or a beepy thing if the oil pressure or water temp went beyond a certain range. Probably never do much more then talk about it .... but it crosses my mind from time to time.

Dirt Full Roller

Total posts: 42
posted March 25, 2003 11:03 PM
I admit that I have a hard time watching gauges while racing also. I wired all my gauges to lights so they would catch my attention. I even use a tach with a shift light so I don't have to watch it but I know about what rpm it's turning when the light comes on. The lights have saved me some money on engine troubles for sure.

Dirt Freak

Total posts: 273
posted March 26, 2003 02:32 PM
I have done the same thing Dirtracer50. We were racing on pavement and I would set the shift light at the desired rpm at the end of the straight. I KNEW if I had a good lap 'cause the light would go on early, but if I had a problem getting off the previous corner, I would drive in waaaaaaaay deep trying to light up the tach! LOL!!!!!!!

Dirt Forum Champ
Total posts: 1565
posted March 27, 2003 03:07 AM UIN: 54865418
if that red light doesn't get his attention nothing will just put it right in front of his face and he will notice i don't think having the car just die on him in the middle of the pack would do much for helping the racing budget either at least with a light he has time to react and try to get out of the way instead of tring to figure out why it died

RC Racing
Dirt Maniac

Total posts: 144
posted March 27, 2003 09:02 AM
dode, how much time does he have in the car? How many races? You probably just need to give him some time/experience and the light.

My 1st few races, the only time I looked at anything but the track & the cars in front or besides me was during staging, a caution, or cool down laps. Now, I'll do I quick scan middle of the straights, etc.

The kill switch is a unique idea, but consider the mess if the engine died when he's in the middle of the pack.

Go with the light.


Dirt Freak

Total posts: 417
posted March 27, 2003 09:33 AM UIN: 13209501
He has about 15 nights in the car so far, and still doesn't tell me a lot. Maybe I am just a little impatient. I got a recall tach this year, so that's one step ahead. Maybe some playback gauges? I just don't want him to blow a motor because of not paying attention. I agree the idea has drawbacks, but if he is running in the middle of the pack and the motor locks up, I'd have to say that probably would cause the same result wouldn't you?


Dirt Maniac

Total posts: 102
posted March 27, 2003 10:43 AM
If you still want to use a gauge that has a ground in it use a murphy gauge , you can pick one up at a John Deere Dealer in the area . The gauge will ground out the igition at 10 pounds of oil pressure . The gauge has a push button in the face of the gauge for starting the vehicle . Pushing the button will un ground the gauge . Just wire it into the ignition system .

[This message has been edited by autoshop (edited March 27, 2003).]

Dirt Freak

Total posts: 417
posted March 27, 2003 11:45 AM UIN: 13209501
That's kinda where I got the idea (I used to work as an powertrain engineer for John Deere, and we used it on a few things). We have a gauge light that does the same thing, so all I should have to do is T off the line. Yeah, it doesn't have a push button for starting, but I have that laying around.


Dirt Freak

Total posts: 237
posted March 27, 2003 12:48 PM
I believe the latest issue of CT mag has exactly what you're talking about. In their "new products" area. Called Engine Guard from Pro 1.

Quote from mag: "Built to protect your engine from damage caused by loss of oil pressure or overheating, Engine Guard will cut power to the engine within one-tenth of a second if a problem is detected."

Dirt Freak

Total posts: 417
posted March 27, 2003 01:02 PM UIN: 13209501
Hmmm...what month is that? I don't know if I have gotten it yet. You wouldn't want to just shut it down if it gets hot would you? You have no water flow through the system and no air flow through the radiator. The oil still makes sense to me though.


Dirt Maniac

Total posts: 199
posted March 27, 2003 09:25 PM
If you are going to use a switch to shut down the engine on low pressure be sure you have a good oil pan or an accumulator. A stock pan will let the pressure drop to 2- 3 pounds for a moment as you pick up the throttle on corner exit. SLEEPY

redneck bubbas racing
Dirt Freak

Total posts: 213
posted March 30, 2003 12:39 AM
I can't really help directly with your problem but I do have a solution. I couldn't (or didn't) pay enough attention to my gauges becuase I had a hard time figuring out what it said in the heat of the battle. I turned my guages so that staight up is where normal condition would be. Anything to the left on the oil and I paid more attn., anything to the right on the temp and I did the same thing. I also did this to my tach for end of straight away rpms.

Dirt Full Roller

Total posts: 46
posted March 31, 2003 07:30 PM
that's a great idea. it's called "indexing the guages" you turn them all in thier mounts so that when they are in the normal operating ranges they are pointing up. that way when you look over for a quick glance, as long as the needles pointing up all is good.

Dirt Full Roller

Total posts: 69
posted April 12, 2003 09:41 PM
John - if you haven't found the solution to this one drop me a line - I've got a schemetic for it - also there are some pressure switches with 3 connections on it - one pair closes when pressure is "up" and the other one is a "normal" idiot light ground signal - You'll have to scour the parts book for that one.... Otherwise it's easily done with a relay.

Dirt Full Roller

Total posts: 43
posted April 13, 2003 10:10 AM
Summit has an oil presure safety switch
that cuts off @ 7psi...$13.00

Dirt Freak

Total posts: 352
posted April 13, 2003 10:30 AM
2 inch trailer side markers are good lights, just drill a 2 inch hole and they pop in with the rubber gasket.

if a person cant see that they have no business driving a Yugo on the road.


Dirt Roller

Total posts: 25
posted April 13, 2003 03:12 PM
I see alot of guys that run the light backwards. I mean its on as long as there is pressure. I don't understand that idea.
I would rather have a big red light warn me of no pressure. Than have a light tell me there is pressure.

Jason Boivin

Dirt Maniac

Total posts: 110
posted April 14, 2003 09:53 AM
I agree the Idea of the light staying on all the time wouldnt be my 1rst selection.But also if you do go with the low oil pressure kill switch listen to what sleepy said about a good oil pan and or accumulator because Ive ran stock pans that Ive modified myself and I run the warning light and In hard cornering see the warning light flicker on and off.And I dont think you want a good hard studder from the engine comming off the corner.If your running the low pressure kill switch.

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