Re: dry sump engine oil level

Thanks for that Gordon, my main question was, what stops it wet sumping?
and is it a problem that immediately after shutdown there's so much oil in the sump?
Since the oil pumps are working in unison and exactly the same volume is entering
as leaving the engine/tank (or sometime down the road one would be empty) what keeps
it all at the right level?
I see that many people with modified wet sumps run much higher than standard oil levels
in becs, so perhaps the level in the engine isn't a problem anyway.
Being a Blackbird I just thought it best to check.
Steve H

  ----- Original Message -----
  From: Gordon Griffin
  To: Bike engined Cars Group
  Sent: Friday, April 10, 2009 9:08 PM
  Subject: RE: [bike-engined-cars] dry sump engine oil level






  The whole point of a dry sump system is that the sump should be, effectively, dry when the engine is running. There are normally at least 2 scavenge stages to 1 pressure stage, so the oil should come out of the engine at least as quick as it goes in. Are you measuring level on a dipstick in the engine case while the engine is running? With the amount of oil splashing around in the engine you'll not see any meaningful reading on that. Without the engine running, all you are measuring is how much oil had been up in the engine waiting to drain down when you turned it off.

  With a dry sump system the only meaningful level is the oil level in the tank when the engine is running. The oil level in the tank should usually be just below the top baffle in the tank when at a fast, hot idle. This means that the oil returning to the tank has to run across the top baffle before falling into the main bulk of the oil, which helps de-aereate it.

  G

  To: bike-engined-cars@...
  From: guzziart@...
  Date: Fri, 10 Apr 2009 18:22:14 +0000
  Subject: [bike-engined-cars] dry sump engine oil level

  Hello all. I have finally started up my Blackbird engine with Pace/Nova dry sump system. The question I have is what level of oil should be in the engine? With the oil in the remote tank correct, the engine oil level is 12mm ABOVE the max level on the distick. Oil is being returned to the tank via the oil cooler and 1 of the scavenge lines, (I can't see the 1 going to the PRV in the tank) but as quick as it's being pumped out of course it's being pumped back in...which I'm not complaining about..but what governs the level?

  Advice would be appreciated. Thanks

  Steve H











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