Dust Ejectors

[nissannewby]

Just wondering if anyone has toyed with the idea of dust ejectors on a 4wd?

The equipment I work on has this system on them where a pipe joins the intake (pre filter) and the exhaust (post turbo) and "ejects" the dust. This setup works incredibly well and without it these machines will easily clog a air filter in a shift. When they are working correctly the filters will go the 250hrs between servicing.

Would the flow rates of a humble 4+ litre diesel (turbo) make a system like this a viable option? I think if it could work the benefits would be well suited to touring.

[tweak'e]

it would work but you would need to make a restriction in the exhaust to generate the vacuum needed.
for the small amount of dust that collects in the pre filter its overboard. most have a ducks bill (i think its called) which not only lets water out but blows dust out using intake pulses.
but the big problem with 4by is dust blocking main filter which neither system solves.

[nissannewby]

Only a question. But why a restriction? From what I have seen its just a pipe inserted into the muffler and the air passing over this orifice creates a vacuum. The concept works extremely well on a mine site where ther is just as much if not more dust than what a 4by will see.

It doesnt remove all the dust but takes out the heavier particles I will look into a little further as I believe the figures are above 50% for the dust it can remove.

The main issue I can see with it is whether a diesel of a smaller size will have the intake and exhaust flow rates that could make this viable. Im nearly thinking that with the flow rates generated by say a TD42 it might not be enough.

Im still on a learning curve and there are some switched on people around.

[tweak'e]

need the a restriction to make vacuum, otherwise the exhaust pressure will go straight into the air cleaner. look up long path egr systems.

50% of dust could be removed IF its in the filter bowl and not clogged in the filter. often big rigs will run a spin type setup in the air intake so big stuff if caught in the bowl rather than the filter. that may be in the snorkel head but i've had it built into the filter itself.

flow of engine doesn't matter. biggest thing would be room for that sort of system.

[nissannewby]

The systems on these machines have a one way valve to prevent exhaust going back in. The also like you said have a vortex style intake before the filter which will throw the heavier particles to the outside of the housing then sucked out by the ejector.

If it was a scaled down setup of what I see then I think it could easily be done I suppose the best thing would be to give it a shot. Cheers for the input by the way.

[Shadow]

The systems on these machines have a one way valve to prevent exhaust going back in. The also like you said have a vortex style intake before the filter which will throw the heavier particles to the outside of the housing then sucked out by the ejector.

If it was a scaled down setup of what I see then I think it could easily be done I suppose the best thing would be to give it a shot. Cheers for the input by the way.

I dont think it will ever be worth the effort, the filters just dont get dirty enough fast enough.

If your driving in a dusty convoy you clean your filter every day.

the only advantage to a system like this would be if you frequently drive in a dusty convoy, and are too lazy to clean your filter daily(its really not that hard!)