dry sump building up pressure
Discussion
Hi foks,
still playing around with my dry sump system and really need some help.
I have a rather special engine setup with an external DAILEY oil pump. What I see is a constant air pressure built up in the dry sump.
If I close the vent I have a substantial pressure built up in the tank ?
I have no vents at all at the engine only a vent at the top of the dry sump. In certain driving conditions I get some spill through the K&N filter
that I placed on top of the Peterson tank. When the engine is running in idle the oil level is 1 cm below the mesh.
Maybe I simply have too much oil in the system ?
My other idea is to place another catch tank that can hold this amount of spill and then return to the oil tank when these certain conditions (driving at idle and then accelerate hard) but letting pass the oil fumes to the inlet manifold.
My question is where is this air coming from ?
The air pressure seems to rebuild very quickly so if I connect it to the manifold I fear that this cylinder (spyder manifold) is runnig too lean then.
Still a miracle for me where this air is coming from ?
still playing around with my dry sump system and really need some help.
I have a rather special engine setup with an external DAILEY oil pump. What I see is a constant air pressure built up in the dry sump.
If I close the vent I have a substantial pressure built up in the tank ?
I have no vents at all at the engine only a vent at the top of the dry sump. In certain driving conditions I get some spill through the K&N filter
that I placed on top of the Peterson tank. When the engine is running in idle the oil level is 1 cm below the mesh.
Maybe I simply have too much oil in the system ?
My other idea is to place another catch tank that can hold this amount of spill and then return to the oil tank when these certain conditions (driving at idle and then accelerate hard) but letting pass the oil fumes to the inlet manifold.
My question is where is this air coming from ?
The air pressure seems to rebuild very quickly so if I connect it to the manifold I fear that this cylinder (spyder manifold) is runnig too lean then.
Still a miracle for me where this air is coming from ?
I read that the scavenge pump is creating a vaccum in the crankcase and that the pulled air is what I finally get out of the tank vent ?
I could feed this air in an opening of my intake manifold but would only go to one cylinder. I am fearing that this could make this cylinder to run to lean
or am I too prudent ? I could also feed this air over a filter to my intake box so the air would be equally distributed over all cylinders but oiling my throttle body with these oil gases could become messy ?
I could feed this air in an opening of my intake manifold but would only go to one cylinder. I am fearing that this could make this cylinder to run to lean
or am I too prudent ? I could also feed this air over a filter to my intake box so the air would be equally distributed over all cylinders but oiling my throttle body with these oil gases could become messy ?
Sounds to me like your scavenge pump is doing exactly what it is supposed to do. Once it has pulled all the oil out it is sucking air from the crank case.
You first need to make sure air is not entering the crank case from any other route like the rocker covers. If all is sealed then the air is blowby.
David Vizard says pulling a vacuum on the crank case increases HP.
I don't think you should vent the tank to the vacuum side of the manifold so the filter housing would be best. If you think this would contain too much vapour then you could take the fumes via another catch tank but this time use a tank filled with wire mesh (wire wool) which will trap the oil droplets.
Steve
You first need to make sure air is not entering the crank case from any other route like the rocker covers. If all is sealed then the air is blowby.
David Vizard says pulling a vacuum on the crank case increases HP.
I don't think you should vent the tank to the vacuum side of the manifold so the filter housing would be best. If you think this would contain too much vapour then you could take the fumes via another catch tank but this time use a tank filled with wire mesh (wire wool) which will trap the oil droplets.
Steve
Crank case vacuum is good thing, even some wet sump Chevy boys use a belt driven crank case vacuum generator to increase HP... But like you say this leads to lots of venting needed in the drysump tank. Venting the tank though another small wire filled vent tank will help reduce the oil mist in the air... But dont worry as long as you have good Compression Test and not to much leak down, when the engine in warm you should be ok.
great answer, already made a drawnig for another catch tank that is connected to the oil tank vent. Will have some internal
routing so the oil splashes can quiet down but fumes can pass. Will install the second catch tank higher than oil tank vent
so the oil can return to the tank. What about connecting the output to the manifold to burn these gases. Is there a risk
for the cylinder to run too lean ?
routing so the oil splashes can quiet down but fumes can pass. Will install the second catch tank higher than oil tank vent
so the oil can return to the tank. What about connecting the output to the manifold to burn these gases. Is there a risk
for the cylinder to run too lean ?
spatz said:
Harry guided me to a peterson pressure regulator, I understand this would go into the top opening of the tank vent and will allow me to adjust the air pressure in the oil system ?
No it regulates the maximum vacuum in the crankcase to protect seals, so it goes somewhere on the crankcaseGassing Station | Ultima | Top of Page | What's New | My Stuff