provent has much better filter than the others, plus it has bypass valves in case of blockage.
Help Support Nissan Navara Forum:
digbyj
Member
Hey pete, forget my technical opinion... I wouldn't have a clue, but that one looks a bit... ugly! From what I've read on all the threads I'll just get an eBay one that I like and just make sure I get the install and medium right.
Have you checked out the recovery hook thread? Bit of a rethink...
Have you checked out the recovery hook thread? Bit of a rethink...
Peteyen86
Member
No worries, Ill find a spot for it make a new bracket. Had i plan for where i wanted it but its a bit longer then i hoped. I'll work it out.
Cheers
I know what you saying looks a bit cheap. If i used that one i would rough it up and spray it black, look fine then
Ill check out the other thread now
Pete
sugammadex
Member
The Provent 200 it is quite a big unit but it is actually designed to do the job of filtering the blow by gasses and coalescing the oil mist, not just catching any oil surge.
The cheaper cans (which are more of a mass oil surge can for street racers and dragsters) are sold empty, some you cant even get inside which surely tells you that they are designed for a different purpose, and to get any mist condensation you need to pack with some sort of filter medium like stainless steel wool and baffles.
These work to varying degrees depending on how well you pack them, if you are getting oil collect in one of these cans, im sure you would get much more with the coalescing filter. As i understand no amount of stainless packing and baffling will filter down to 20-50 microns which is what is needed to coalesce the oil mist into liquid oil.
The cheaper cans (which are more of a mass oil surge can for street racers and dragsters) are sold empty, some you cant even get inside which surely tells you that they are designed for a different purpose, and to get any mist condensation you need to pack with some sort of filter medium like stainless steel wool and baffles.
These work to varying degrees depending on how well you pack them, if you are getting oil collect in one of these cans, im sure you would get much more with the coalescing filter. As i understand no amount of stainless packing and baffling will filter down to 20-50 microns which is what is needed to coalesce the oil mist into liquid oil.
If you're filtering it out, you'd need a very fine filter and it wouldn't last long before it was blocked, and that could get dangerous.
The goal can also be achieved by getting the blow-by to cool down, encouraging the oil to form a condensate on the inside of the pipe/catch can. That is so much easier to write/say than to achieve of course!
The goal can also be achieved by getting the blow-by to cool down, encouraging the oil to form a condensate on the inside of the pipe/catch can. That is so much easier to write/say than to achieve of course!
Peteyen86
Member
What about this sort of design? And possibly have longer inlet hose? Its from 42 Draft Design catch can.
I was thinking about mounting the provent behind the bullbar somewhere. Would this lead to any problems as the hoses will be quite long? Havent looked for a space behind there yet but was an idea?? Longer hoses would aid in the cooling i was thinking also.
I was thinking about mounting the provent behind the bullbar somewhere. Would this lead to any problems as the hoses will be quite long? Havent looked for a space behind there yet but was an idea?? Longer hoses would aid in the cooling i was thinking also.
Attachments
My own thinking is to position it somewhere in front of the radiator/condensor/intercooler assembly, where the fresh incoming air keeps the unit cooler.
I don't think a filter medium of any description is going to help. Something like stainless steel wool would be of benefit in the mid-to-upper part of the inlet, to randomly deflect the incoming gas stream so that the oil particles are guaranteed to collide with some metallic surface and thus encouraging condensation.
Because the oil is going to sit at the bottom of the chamber, a central baffle forcing the exhaust gas to pass below the baffle into the "exit" region may stifle the flow, pressurising the chamber a little and possibly causing oil to be forced out. I've got some ideas on how approach this problem to maximise flow, oil condensation and ultimately reduce the escape of oil from the outlet as much as possible. When I've made something up I could be tempted to manufacture it, if it's effective - but I'll try it on my own car first, before I say that anyone else ought to be using it.
I don't think a filter medium of any description is going to help. Something like stainless steel wool would be of benefit in the mid-to-upper part of the inlet, to randomly deflect the incoming gas stream so that the oil particles are guaranteed to collide with some metallic surface and thus encouraging condensation.
Because the oil is going to sit at the bottom of the chamber, a central baffle forcing the exhaust gas to pass below the baffle into the "exit" region may stifle the flow, pressurising the chamber a little and possibly causing oil to be forced out. I've got some ideas on how approach this problem to maximise flow, oil condensation and ultimately reduce the escape of oil from the outlet as much as possible. When I've made something up I could be tempted to manufacture it, if it's effective - but I'll try it on my own car first, before I say that anyone else ought to be using it.
Peteyen86
Member
"My own thinking is to position it somewhere in front of the radiator/condensor/intercooler assembly, where the fresh incoming air keeps the unit cooler"
Great, i'll have a look for a location behind the bullbar tonght. So longer hoses needed to get to this spot wont worry anything? Thinking i'll run the hoses down behind the fuel filter, along beside the precleaner/airfilter and out near the left hand headlight somewhere. That will increase the lengths of hose considerably though?
Great, i'll have a look for a location behind the bullbar tonght. So longer hoses needed to get to this spot wont worry anything? Thinking i'll run the hoses down behind the fuel filter, along beside the precleaner/airfilter and out near the left hand headlight somewhere. That will increase the lengths of hose considerably though?
It will increase the length of hose, but my guess is that since it's all exhaust + oil and isn't needed for the smooth operation of the engine, the length doesn't matter to the engine. It will matter in terms of cost, and it will matter that it doesn't get in the way of other stuff.
If anything, the longer hoses will give the oil more chance to cool and condense.
If anything, the longer hoses will give the oil more chance to cool and condense.
Peteyen86
Member
No worries. Not worried about cost for this. Much prefer to mount this provent in a location that doesnt look out of place and is not going to rub/get in the way of anything else. Also trying to work out how to mount it without modifying anything too much.
Will have a good look behind the bullbar tonight for a spot. Think i can run the hose work nice and tidy to the front pretty easy. If i suceed, i'll post what i come up with.
Thanks for your help
Pete
Peteyen86
Member
Oh, and if you want to start manufacturing your design in the future, shout out if you need design drawings or any CAD/3d work, i can help out there.
Pete
Pete
i never had any success with baffles. the oil mist just flowed around the baffles and didn't get caught.
even my own setup using a filter doesn't get it all. get the light right and you can see it coming out the can outlet.
only problem with being up in front of the engine bay is what happens in an accident. a litre of hot/warm engine oil and more importantly engine oil mist, getting sprayed when the can is crushed during impact.
btw just because its in front of the radiator it doesn't mean it will stay cool. i had a temp sensor up in front (to measure ambient air temp) and when slow or stopped the temps shot way up.
sugammadex
Member
Old.Tony said:
I completely agree, which is why the provent (made by Mann &Hummell) has been specifically designed for its stated purpose, it has a max flow rate of 200L/min and suitable for engines up to 350kW with a pressure relief valve fitted. The filter has been designed not get blocked I'm sure the membrane is oleophobic (oil phobic, a bit like rainex for windows which is hydrophobic (water phobic)
The coalescing design of the filter is likely to be quite different to other water/oil seperator filters which may well block and cause back pressure. The company which specialise in industrial filters has put a lot of r&d into the provent range, (google search the words provent and pdf for the spec sheet) slightly more scientific than pushing steel wool into a catch can whose only design consideration was to choose what colour it comes in!
I know they are expensive but I would rather pay twice as much to do more than twice the job
Peteyen86
Member
I already got the Provent, just working out the best place to install the sucker.
If you have one, where abouts did you put it? Seen all the other places people have posted on here but trying to work out the best/ neatest option.
If i cant work out a spot im happy with ill wait until i get a snorkel and get rid of the precleaner, make a bracket and put it there. Have plenty of room if i go down that path.
Pete
