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Semi Dry sump

Old 01-25-12, 05:14 PM
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Semi Dry sump

Does any one know how much oil the stock fd oil pump pumps? GPM.
Not just the amount through the coolers but the amount bipassed as well...
I'm trying to work out how much scavange capacity you would need to keep up with the pump...
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Old 01-25-12, 05:33 PM
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It's not just GPM but GPM in relation to RPM. What you're looking for is a datalog from an inline flow meter. Contact http://www.daileyengineering.com/ or http://www.paceproducts.co.uk/

And what do you mean by "semi-dry sump"???
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Old 01-26-12, 02:54 AM
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I assume you mean A log of the flow rate from an after market oil pump.
That isn't what I need.

I don't have much room in my application so I want to let the stock pump feed the engine and i'd like to know the max flow rate of a stock rx7 oil pump an say at 7500 engine rpm.
Then I'd add say 50%
And then I can spec the scavange pump(s)
I need to know the total the pump will pump inc bypass because the scavang needs to return all the oil the pump consumes to the tank.
The rate of oil only going through the coolers or bearings is not all the oil the stock pump pumps...
The amount an after market pump pumps is also not what I'm looking for as they usually have an internal bypass...
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Old 01-26-12, 08:27 AM
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The stock pump has one pickup. If you're running a plate you will need at least two pickups. If you use the stock pump and split the pickup and one pickup is uncovered, like during a launch or a corner, the pump will pull from the path of least resistance. The pump will suck air and the bearings will starve.

Aftermarket pumps have a suction pump for each scavenge line.

What's your application. Packaging is never too tight for an aftermarket pump. The oil tank is another issue...
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Old 01-26-12, 06:11 PM
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You would be better off using the stock pump as the scavenge and then use the space you wer going to use for an external scavenge for your pressure.

More details of what you are trying to do will help, I've done a lot of dry sump/wet sump/external tank/external pump/internal pump stuff.
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Old 01-26-12, 10:40 PM
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A dry sump based around the stock pump sounds pretty interesting.
Although I'm not sure how it'd work with the stock pump as it just wasn't designed to work in an application like this.
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Old 02-24-12, 12:56 PM
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Originally Posted by PvillKnight7 View Post
The stock pump has one pickup. If you're running a plate you will need at least two pickups. If you use the stock pump and split the pickup and one pickup is uncovered, like during a launch or a corner, the pump will pull from the path of least resistance. The pump will suck air and the bearings will starve.

Aftermarket pumps have a suction pump for each scavenge line.

What's your application. Packaging is never too tight for an aftermarket pump. The oil tank is another issue...
The stock pump shouldn't be using a pick up in the pan. It should be routed to the dry dump tank, where, hopefully, you have enough oil to keep the bottom of the tank covered in oil.
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