QUOTE (trackbird @ Jan 3 2008, 06:28 PM)

QUOTE (rmackintosh @ Jan 3 2008, 11:53 AM)

I guess I am not too clear on how the sumps work. With the manual valve it is either on or off correct? I thought that the electric valve was the same, just opened via a electric switch.
However, now you are bringing pressure switches into it. Does that mean that the sump will not activate UNTIL the pressure is lower than what the switch is set at?
I thought you just revved the engine on shut down to peak oil pressure thereby charging the sump and then shut the valve. Then, on operation, the sump would attempt to maintain that pressure. Do I have it wrong?
Thanks,
Randy
You are suggesting exactly what I do (though I don't rev the crap out of it, I may or may not pull the idle up to 2,500 rpm for a few seconds and then shut the valve).
The switch shuts the valve below 25 psi to the engine will get any oil from the pump. However, I feel that this is a stupid idea because you now have a closed sump with 25 psi of oil in it. If the engine has less, then let it stay open. This is why I have the valve as "extra". I didn't use it. I'm also running an M55HV oil pump (standard SBC) and I have enough volume and pressure to fill it and feed the engine as soon as oil becomes available. I think I was seeing 19 psi on the autometer at Nashville when on track (on street tires).
This could work really well with a pair of valves and some check balls. Let it run wide open until empty, but hold the refil until pressure comes up. How many million dollars in plumbing do you think we could tie up in this?

So these valves CLOSE the sump below 25 or 30 lbs. of pressure? That seems odd....seems like it would close your sump when you want it the most....when pressure is REALLY low. Thus your engine won't get a "boost" if anything is left in the sump after that point. Maybe they have determined that after 25 lbs or lower, the sump most likely has shot its wad, and all available oil pressure from the pump should go to the engine and not to recharge the sump.
My understanding is when the engine is running, the sump will automatically recharge and equalize to the "appropriate" pressure, so after the 25 lb. situation went away, the sump would reopen and recharge....that is my supposition though....