fallen

I have a wet sumped LS7 in my 04 Z06. I have a DRM radiator/oil cooler and am using a mobil1 filter with mobil 1 15w50. An accusump has been T-eed into my return line from the cooler with a one way valve to prevent backflow into the cooler if the sump is triggered.

Below is some data on psi vs. temp vs. rpm that I have collected. There are many oil pressure threads, but without temp and rpm, they are not that informative.

My question is do the oil pressures at the various temps and rpms look ok?

The motor has been recently refreshed and after the 3 and 4th oil changes I have a tiny amount of bearing material in the filter. There is about 2-3k on the new build. I will change the filetr again within a few hundred miles and look for material.

Thanks.

RPM x 1K TEMP PSI
1 93 49
1 135 43
1 147 42
1 150 41
1 160 39
1 170 37
1 175 37
1 180 36
1 190 34
1 194 36
1 200 33
1 210 31
1 212 30
1 216 32
1 217 31
1 219 29
1 223 29
1 225 28
1 230 26
1 232 26
1 240 23
1 241 26
1 252 22
1 253 19
1 255 19
1 257 20
1 259 19
1 262 19
1 264 19

2 93 57
2 135 50
2 150 46
2 175 42
2 180 41
2 190 40
2 200 39
2 210 36
2 217 35
2 225 33
2 223 33
2 230 32
2 232 31
2 240 28
2 241 30
2 243 32
2 253 29
2 255 26
2 262 26

3 93 66
3 135 69
3 150 53
3 180 48
3 190 46
3 200 44
3 210 43
3 217 40
3 225 38
3 230 35
3 232 35
3 240 32
3 248 35
3 255 30
3 262 29

4 93 71
4 135 65
4 150 57
4 180 51
4 190 51
4 200 48
4 210 46
4 217 43
4 225 40
4 230 39
4 232 39
4 240 35
4 246 39
4 255 32
4 262 30

5 275 31

throwit

Those numbers are low. I have been having very similar issues although my idle psi was higher than yours. Turns out my main bearing clearance was not tight enough. According to a very trusted engine builder, at temp (250+) the engine expands (~2 thousands of an inch) enough to make the pressure go to $h!t. So the clearances must be set fairly tight to account for this.

You do have a A-sump so I am curious if that may be a contributing factor.

Good luck

fallen

My thinking is that the only part of the accusump system that could reduce pressure is the one way check valve. I have previously conducted an A-B-A test by removing the T and the valve (effectively isolating the accusump from the system) and installing a jumper hose.

Off the top of my head I believe the pressure gained by removing the system was at most 1-2 psi.

However, I did not personally install the check valve this time around (a trusted vendor did). I know that if you screw the fittings too far into the check valve it will not open all the way and obstruct oil flow.

I will also ask the builder for my build sheet (which I did a while back) to check clearances.

In the meanwhile has anyone else checked there pressures ar 3 or 4k when hot? 230, 240, 250, 260. (We would also have to know type of oil/filetr, etc.) I think we can all benefit from this info. Thanks.