Oil pressure

[Jean-Sebastien Stoezel]

Hi:

I just recently started logging oil pressure, and I'd like to see how this compare to what others get.
Would it be possible for one of you to post screenshots of the plots you get? Ideally rpm and oil pressure in the same screenshot, vs time or distance.

And if possible a scatter plot of oil pressure vs rpm.


Thanks,
JS

[Diamond Level Motorsports]

Here is a screen shot of my Engine Profile Page. This data is from my FV at Laguna a couple of weeks ago. I like to review the shotgun plots which compare the oil pressure Vs the Lat, Long, and Vertical G's to see if I am having any pressure losses while the car is in motion.

[mblanc]

Shouldn't Your oil pressure vs long G should be scaled like your op vs lat G. -2 to +2

[Jean-Sebastien Stoezel]

Hi Scott:

Thank you for the reply. It's interesting that you are looking at oil pressure vs accelerations.
I thought checking against RPM was equally important, since there should be a direct relationship between RPM and oil pressure (at constant oil temperature).

Regardless, it's interesting that the oil pressure mainly stays at relative high plateaus, and goes much higher past a specific RPM. I'm not necessarily seeing plots remotely close to what you have. For instance I would get much more scattered plots for the pressure vs accelerations since my oil pressure swings too much based on RPM. I'd have to factor RPM in these scatter plots. But I guess the point of these plots is to check that the pressure doesn't drop lower than a certain value.

Thanks,
JS

Here is a screen shot of my Engine Profile Page. This data is from my FV at Laguna a couple of weeks ago. I like to review the shotgun plots which compare the oil pressure Vs the Lat, Long, and Vertical G's to see if I am having any pressure losses while the car is in motion.

[Steve Davis]

Scott,
I note in your OP plot several FLAT spots .. with variances both above and below that level. Normally, I would expect a FLAT spot to occur at limiting levels ..where the pressure relief stopped the pressure from going higher. Your flat spots seem to be around 4600 to 5100 RPM.. right in the middle of your total range.

To what would YOU attribute those flat spots?

[Hardingfv32]

Could the flat spots be the oil pressure high side limit/setting? The readings above this level examples of the capacity of the oil relief valve being exceeded? 4th gear rpm at Laguna is/was low.

Brian

[Chuck Wilson]

I would think tjhat as long as the pick up tube is picking oil up the oil pressure would remain the same. I imagine with all the top engine builders if they did not build good baffles we would see more blown engines.

[Diamond Level Motorsports]

Shouldn't Your oil pressure vs long G should be scaled like your op vs lat G. -2 to +2

Marc,

I am looking for oil pressure losses under braking, or negitive long g's. Not really concerned about oil pressure under acceleration. That is why the plot is set up that way. I did notice that my plot is set up backwards. It should be showing - G's for deceleration, not positive.

Additionally, I see that my vertical G plot is wrong also. I will fix that.

Steve,

I'm not a motor guy so I have no idea what it all means. I'm just making sure that the pressure doesn't drop below a minimum value.

[budawe]

Didn't you run your FFirst at Laguna a couple of weeks ago? Are you running the dry sump system?

[Diamond Level Motorsports]

Didn't you run your FFirst at Laguna a couple of weeks ago? Are you running the dry sump system?

Hi Brian,

Aaron ran the FV and I rented my FST to Robert Clark from Michigan. Running two cars is a lot of work....

The FST does have a dry sump.

Actually the oil pressure traces with the dry sump are even stranger than the FV with the wet sump.

Maybe I have upset the oil pressure gods.....IDK.