Quote:
Originally Posted by M2guru
If 28psi is normal idle oil pressure:
Normal start up (after the car sat for a week): It took ~0.5 seconds to build up to ~900 rpms (higher than the subsequent tests). It took ~ 1 second to get to ~28psi. The average engine speed over that 1 second is 913. 913 revs per minute = 15.2 revs per second. If I did my math right, that's ~15.2 revolutions with oil pressure below ~28.
Normal start up log: https://www.bootmod3.net/log?id=64de...0b439c89d6a4d6
Startup after oil drain without spark plugs: It took .5 seconds to go from zero to 235 rpms. It took ~2.5 seconds to build up to ~28 psi. The average engine speed over those 2.5 seconds is 243 rpms. If I did my math right, that's 10 revolutions with oil pressure below ~28.
Without spark plugs log: https://www.bootmod3.net/log?id=64de...729b43b38a162d
Attachment 3256149
Startup after oil drain with spark plugs: (I reran this test because of residual fuel during the original test). It took .5 seconds to go from zero to 235 rpms. It took ~6 seconds to build up to ~28psi. The average engine speed over those 6 seconds was 230. If I did my math right, that's 23 revolutions with oil pressure below ~28.
During this re-test, I noticed two things: 1) the car sat overnight and that seemed to impact the time needed to build pressure and 2) the second crank didn't seem to add any significant oil pressure. Perhaps it's recommended as insurance...
With plugs: https://www.bootmod3.net/log?id=64df...729b43b38a688e
Attachment 3256146
Revised video: |
Good stuff!
Personally I still recommend pulling the plugs though, 2.2 extra psi of leak pressure and less cranks to get pressure. It's easier on your starter motor. Then you can crank it longer and harder.