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  #361  
Old 14 Hours Ago
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Hippysmack Hippysmack is offline
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I managed to get a couple videos done before the rubber cap took a dump.
I combined them into a short thing just to show the oil stream quality with/without the sump port plugged off.
Oil stream quality coming from the cam port inlet is different going out the return to tank line if the sump port is open to atmosphere or plugged.

With the sump port open to atmosphere; Both air and oil were pumped thru the return hose.
The smaller cam port cavity delivers oil to the bigger sump cavity and air fills what's left in that cavity as normal.

With the sump port plugged;
Both air and oil were still pumped thru the return hose at a tighter condition.
The bigger sump cavity pulled a huge vacuum that sucked oil and air from the cam port inlet and entrained air and oil.
The second part of the video shows tight nit “lighter in color” air/oil mix traveling with the darker oil in segments.
Vacuum on the plugged off hose from the sump is 50 cmHg.

This is the reason the cam box return cavity inside the oil pump needs to be welded up or shared with the sump cavity when doing the Karling Mod.
Otherwise the vacuum that will be created in the cam chest inlet CAVITY in the oil pump (even though the top of the pump would be capped from the cam chest) will also create a huge vacuum that will affect oil stream quality and fill in the sump cavity.
Both ways seemed to deliver the same amount of oil to the container (about 13 oz per minute).

edit:
Basically the high (for these pumps) vacuum from the sump cavity was pulling thru the clearances in the gerotors and consequently from the cam port.
That's why there was so much vacuum I saw in the cam chest inlet.
It was vacuum from both inlets.


Video:
http://www.sportsterpedia.com/lib/ex...hippysmack.mp4
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In Search of Fuel, Sunshine and a Steady Idle.

Reference the XLFORUM'S Sportsterpedia
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Last edited by Hippysmack; 14 Hours Ago at 21:38..
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  #362  
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I got 3 tests done measuring volume of;
Sump inlet port (cam port open to atmosphere)
Cam inlet port (sump port open to atmosphere)
Both ports delivering oil
Pump speed was 654.3 RPM.

* The cam port alone inlet delivered about 16 ounces per minute.
* The sump port alone delivered about 43 ounces per minute.
* Both the sump and cam ports together delivered about 71 ounces per minute.

Total projected volume from the return gerotors (CCing gerotors) was 62.08 oz/minute at pump speed 500 rpm.
So the flow test results are comparable although higher than projected due to higher pump speed.

As long as both return inlets are getting oil, volume picked up and returned to the tank is a little higher.
It seems these two inlets complement each other.
And in reverse, if oil is not flowing as fast to one or the other port, total volume back to the tank is lower.
Actual return volume will be lower in operation since the return gerotors are bigger than the feed gerotors.

The individual flow volumes add up to the cam chest inlet port delivering 27.1% of the flow (16 + 43 = 59), (16 / 59 = .2711864406779661 or 27.1%)
It's not known from which or both inlets that the extra 12 ounces of oil came from when they were tested together.
The vacuum being higher in the sump port when the cam port introduced oil from the previous post suggests it's the added vacuum from both cavities filled with oil that jacked up the total volume.

1998-2006 Return Test Video: Both Ports Delivering Oil
http://www.sportsterpedia.com/lib/ex...hippysmack.mp4

1998-2006 Return Test Video: Sump Port (only) Delivering Oil
http://www.sportsterpedia.com/lib/ex...hippysmack.mp4

1998-2006 Return Test Video: Cam Port (only) Delivering Oil
http://www.sportsterpedia.com/lib/ex...hippysmack.mp4
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