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Old 04-18-2021, 12:03 PM   #1
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Join Date: Sep 2006
Location: France (zip: 51330)
Default Dry sump question


Can you help me with my dry sump problem.

What kind of capacity must have each pump element?

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Old 04-20-2021, 08:56 PM   #2
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On the F Prod SCCA Sprite {1275cc} that I was crew chief and engine builder from, {1989 to 2009, I'm retired now} we ran a 3 stage dry sump system. I don't remember now what the pump sizes where. From your picture I would get rid of the temperature regulator,? street car, or racecar. We would adjust the oil temps by restricting the air to the oil cooler. So, oil out of the pump, to filter, out of filter, to cooler ,to engine. This was a full up no holds barred racecar. P/S we had an electric blanket heater on the dry sump tank to get the oil warm before a start, and could prime the pump as well.
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Old 05-04-2021, 10:27 AM   #3
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nobody else?
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Old 05-04-2021, 11:26 AM   #4
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Join Date: Oct 2011
Location: The Dalles, Oregon

Really, sizing a pump is going to depend on how much oil your block can flow. Without knowing that, you're just guessing. And without any information as to what engine youre wanting to put a dry sump system on, nobody has enough information to even come close to an educated guess.

In cases that I have worked with, we will dismantle a factory pump and size the pressure pump at 1-1.5-2x depending on optimum revs (unless its an electric pump, then you just calculate it), then port the PRV ports for high flow and set the PRV blow off point accordingly. Typically starting with a relatively low PSI PRV setpoint, but shimming the spring to higher than required, and decreasing PRV set point until we hit the flow numbers we want. You'll see flow numbers changing based on windage, splash, and froth, so you have to go through all the revs.

Since most dry sump pumps are a gerotor style positive displacement pump, you can calculate output flow, and use that to base your setpoints.

This requires an engine dyno to bring oil up to temp, a well calibrated flow meter, and either multiple PRV springs or a single spring and a handful of shims.
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