scavenge pump flow rate

Mart UK

VIP MEMBER
Joined
Mar 11, 2021
Messages
497
Country flag
From my brief and hopefully enduring observation of this machine, the oil returning to the tank appears to have the viscosity of anything between a frothy latte and maple syrup, depending on temperature of the engine. The main thing is that the oil reaches the furthest points in the system as it is designed to do. It amazes me that a tiny oil pump like this can deliver like it does under sometimes harsh conditions. Thanks for your research efforts.
Bert, 20w50 in mine. Before I added a Holland Norton Works breather, it was just as you describe. Afterwards, it is now a smooth oil flow, hardly even pulses.
 
Joined
Mar 12, 2019
Messages
38
Country flag
WZ,
I want to get the same oil for my blend but my local Fleet and Farm has nothing called Resolute. They do have a full syn 5w-20 and a syn blend Premium 5w-20.
Could it be that Resolute was terminated? If so which should i use?
Thks, Tom
WZ,
OK, now i see the problem. Your blend is with Fleet Farm Resolute oil.
I mistook Fleet Farm for Blains Farm and Fleet. We have a Blains but no Fleet Farm in Illinois. Fleet Farm is only in Wisc, Minn, Iowa, So Dakota according to their website. And they wont ship oil to my house, only to one of their stores.
So guess I’ll just blend WD40 with the Blains Farm and Fleet full syn 5w-20.
Do u have a better suggestion that doesnt require me to travel out of state for a quart of oil? Thks, Tom
 

WZ507

VIP MEMBER
Joined
Dec 26, 2013
Messages
505
Country flag
Tom,
I don’t think it would make much difference which one of these oils you use since they are all meeting defined SAE viscosity grades, and we are simply blending low viscosity with high viscosity to obtain an intermediate viscosity. We’re not heating it or cooling it so we shouldn’t be recruiting any of the viscosity modifiers present in the multi-grade oil that could alter the ambient temp viscosity. I’m excited that you’re excited to embark on this next chapter of testing with your rig. Good luck and keep us posted on your findings.
 
Joined
Mar 12, 2019
Messages
38
Country flag
Tom,
I don’t think it would make much difference which one of these oils you use since they are all meeting defined SAE viscosity grades, and we are simply blending low viscosity with high viscosity to obtain an intermediate viscosity. We’re not heating it or cooling it so we shouldn’t be recruiting any of the viscosity modifiers present in the multi-grade oil that could alter the ambient temp viscosity. I’m excited that you’re excited to embark on this next chapter of testing with your rig. Good luck and keep us posted on your findings.
Thks again and i will keep u posted!
 
Joined
Mar 12, 2019
Messages
38
Country flag
Thks again and i will keep u posted!
Heres a lube pmp flow vs rpm plot using a blend of oil and WD40 to simulate a hot oil running condition on a room temp bench test….
Tried various pressures by varying the outlet restriction. Which pressure applies to u depends on how tight your engine is and what pressure your pressure relief valve is set at. This is data from a new Andover pump.
 
Last edited:
Joined
Mar 12, 2019
Messages
38
Country flag
Heres a lube pmp flow vs rpm plot using a blend of oil and WD40 to simulate a hot oil running condition on a room temp bench test….
Tried various pressures by varying the outlet restriction. Which pressure applies to u depends on how tight your engine is and what pressure your pressure relief valve is set at. This is data from a new Andover pump.
So with hot oil at 3150 rpm cruise conditions the lube pump is putting out a good liter per minute. Sounds good but lets compare to the human heart.
Web MD and a second site i read states that the human heart, at rest, pumps 5 liters per minute! And, during strenuous activity,up to 20 liters per minute!
Of course the pressure is low, arterial pressure being about 100 mm hg which is about 2 psi. But 20 l/min is 11 oz per second! Now im wondering what the Commando pump puts out at 2 psi resistance……
 

Mart UK

VIP MEMBER
Joined
Mar 11, 2021
Messages
497
Country flag
And the human heart has been known to exceed 100yrs without a re-lap service. That said, my Commando looks a lot better than I did at the same age.
 

BERT

VIP MEMBER
Joined
Nov 23, 2020
Messages
375
Country flag
Intervals are the best conditioning exercise both for my pumper and the Commando oil pump
 
Top