Dry-sump construction

[Mr Ed]

Pretty sure a PS pump needs to be gravity feed though. You wouldnt be able to install one lower than your engine without getting mighty close to the ground.

[thechuckster]

Also, in the PF version of this thread, it's pointed out that Power Steering pumps are low volume, high pressure - so not ideal for engine oil (flow wise).

[roadsailing]

this is simpler than i could have imagined, i have a request and a question.

first of all, can you make the pics smaller again? i view at 1280 by 1024 and it is difficult to view, might just save them to hard drive.

the question is what happens if the scavenge pump runs dry, does it not happen or not matter?

i'm starting to think about fitting one of these to my car, but i think i would mount the pump in place of an aircon compressor or PS pump as the pulley is set up for two belts already (for no reason other than asthetics really)

[ed]

the whole point is that its OK, infact normal, to let the sacvange pump run dry - as long as the oil tank is full and can still supply the pressure pump

i know its certainly not as cool as a full dry sump setup, but i urge folks to consider looking at the accusump system for comparison - see what system suits your needs and installation.

[roadsailing]

i guess the savenege pump will tolerate momentary starvation better than main bearings at leat, loading case is totally different, its just gears spinning around with no huge loads on them.

[v8soarer]

Ed makes some good points about the accusump, especially if you already have an oil cooler as it can be Teed straight in.

[kingmick]

Yes he does! glad he got one

[Cool1]

What stops the accusump pumping the oil back to the sump? Is there some kind of valve in place?

[oldcorollas]

single Y'ed of two pan outlets would be fine, but there is no point, still going to get the same amount of oil into the pump. We only use 2 with 4 stage pumps!

if you are pulling froth with little restriction, maybe a Y will work, but if pulling fluid from one, and air from the other, you will suck air not oil.... but since you have a large reservoir (like the assusump ), not pulling oil from sump at all times is not fatal.
which is why it's usually one stage per pickup point..

for your 4 stage, you have 2 stages for sump (one for each pickup) and 1 stage for rockers? and 4th stage for pressure??

accusump has manual (bleh) or electric valve.

[kingmick]

What stops the accusump pumping the oil back to the sump? Is there some kind of valve in place?

it gives oil to the pressure side and yes it has a valve! have a look at the moroso site as they should have something on it, there the originial and best

[brett_celicacoupe]

if you are pulling froth with little restriction, maybe a Y will work, but if pulling fluid from one, and air from the other, you will suck air not oil....

unless the Y is lower than the 2 pickups, in which case the denser fluid (oil) will sink to the bottom and hence it will be sucked..... for how long or how consistent, who knows

[oldcorollas]

unless the Y is lower than the 2 pickups, in which case the denser fluid (oil) will sink to the bottom and hence it will be sucked..... for how long or how consistent, who knows

thats true.... but do you really want a y-piece lower than the sump?
and unless it is on sharp angle (directly beneath into a rail?) it will not flow so quickly....
if you are running 1 stage.. may as well run a second for the second pickup

mick, if the engine is stopped, the accusump will push oil back thru the oil pump and into the sump.. which is (partially) why they have the valve.. oil will also go thru the bearings etc...

[kingmick]

unless the Y is lower than the 2 pickups, in which case the denser fluid (oil) will sink to the bottom and hence it will be sucked..... for how long or how consistent, who knows

Its fine if you dont stuff up, how the pickup gets its oil! If you have a look at a dry sump pickup point it isnt hard to see what will be in it!
A deep channel you get waves and foam along the shore, not at the deepest part of the channel.
look at good dry sumps and you can see what happens, yes you get a bit of air pickup at times, but thats why you have an oil tank!

[v8soarer]

mick, if the engine is stopped, the accusump will push oil back thru the oil pump and into the sump.. which is (partially) why they have the valve.. oil will also go thru the bearings etc...

The accusump setup has 2 valves - a 1-way check valve to stop oil going back towards the pump and a solenoid valve attached directly to the accusump to keep oil in the accusump under pressure when the engine is switched off. This is how the pre-oiler function works - the solenoid valve opens when the ignition is turned on sending oily goodness through the engine before it's cranked over.

[kingmick]

and the pre oiler is a good idea and even better with big clearances you can prime and start