Hi guys have a question regarding venting the breather to atmosphere instead of a catch can. Would you have problems through a river crossing or dust entry as I am thinking of removing the provent 200 and running hose to atmosphere under the car.
Venting crankcase (1 Viewer)
- Thread starter jules781
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I have done that, one of the downsides to this is sometimes if the winds are just right and you are parked or driving really slow you might get a whiff of it. Also, if you live where winter temps can drop significantly below freezing you may want to put a slit in it near the top running lengthwise, about a inch long so that if the end freezes up it can gas out though the slit. Something done on aircraft reciprocating engines.
- Thread starter
- #3
Yeah ok. That's fair enough. Is it a problem that the hose will be longer than factory
Mine is way longer to reach the frame. That’s why I said about cutting the slit if you live in cold climates, like -30F and colder. The longer the hose the more the hot air will cool down before exiting and possibly having all the condensation freeze and possibly block the hole.
- Thread starter
- #5
Yeah I definitely won't have that problem. Was more concerned a longer hose will be harder for it to breath.
Hadn’t thought of that. Maybe if you routed it all the way to the back with some ups and downs
mine ends under my seat.
- Thread starter
- #7
Yeah ok cause looking at mine I wouldn't mind running it to the gearbox bash plate.
AussieHJCruza
Supporting Vendor
- Joined
- Jul 8, 2013
- Threads
- 64
- Messages
- 2,960
- Location
- New South Wales, Australia
- Website
- www.completecruisers.com.au
Good idea to get rid of the provent, but a slight vacuum in the crankcase isn't a bad thing.
- Thread starter
- #9
Yeah a vacuum is fine but a restriction is another. Also I noticed when removing my provent there was a oily residue. I think the safety valve had been popping off. Obviously it can't handle crankcase gases from the Toyota.
AussieHJCruza
Supporting Vendor
- Joined
- Jul 8, 2013
- Threads
- 64
- Messages
- 2,960
- Location
- New South Wales, Australia
- Website
- www.completecruisers.com.au
The provent design doesn't make sense and several reports indicate they don't work properly. You'd be better off with Ryco or flashlube.
- Thread starter
- #11
Well I have removed it. I have ran the hose all the way to the gearbox bash plate and the hose is facing down through a hole on the bash plate least I won't smell any fumes. Hose length is just over a metre. Having a long hose shouldn't be a issue?
Usually, most people wish they had a longer one... [rimshot]
But no, I seriously doubt you're going to see an issue from it; I don't see what the extra length is actually changing, functionally.
- Thread starter
- #13
Haha.
Yeah I thought the same. Should I cut the hose with a triangle slit to help it draw out while driving or should it be fine at high speeds
Yeah I thought the same. Should I cut the hose with a triangle slit to help it draw out while driving or should it be fine at high speeds
The slit is only there as rupture prevention in the event of a freeze, to my understanding; pressure will open it, if needed. You don't want it open the rest of the time, or it would somewhat negate your having relocated the distal end.
- Thread starter
- #15
Shouldn't it always be open. If the hose is blocked then there will be a restriction. Or did I not understand what you mean
I think you didn't understand me...but if I'm understanding you correctly, you're basically running an open draught tube system for your crankcase vent, and you made it a meter long in order to route the crankcase gasses down and away from the passenger/engine areas. It's just an open tube, so yes: it's always open and there's no restriction.
The suggestion to slice the hose up near the top was made in reference to the possibility of a freeze-blockage somewhere down the line; the slit just creates an escape path for gasses, and prevents crankcase pressure from increasing. If you cut anything more than a normally-closed slit - i.e. anything that stays open under normal conditions - you're creating a redundant outlet for the gases and negating the entire point of the relocation and the meter-long hose.
Since it doesn't seem like you live in a cold climate, cutting the slit isn't going to have any impact, because there will never be any serious chance of freezing. Personally, I wouldn't bother with it.
If you're concerned about the hose length restricting the ventilation, consider two things:
- Draught tubes have been used for a very long time, and are still used in exactly this situation.
- A hose of the proper size won't impact ventilation; that's only going to happen if you undersize it.
Last edited:
The only potential for a problem I can think of is if the hose is too long and you end up with valley’s where oil/water could pool and eventually maybe cause blockage
That could happen if you make a roller-coaster out of it, yeah. I was thinking back to some of the vehicles I've seen/worked-on that used a true reward-facing draught tube, and for the most part they usually went downhill for their entire length. Some were straight down until they turned backwards, others sloped here and there, etc, etc, but the commonality was the continual fall. There might be some looping-upwards near the block/head, but that's about all. Either way, it's all not a problem unless the vent is undersized. Seems like the bigger debates are 1) whether or not to plumb the vent into the intake, and B) whether or not diesel crankcase fumes are corrosive enough to cause issues.
- Thread starter
- #19
Yeah it is all down hill so nothing will pool up. I was just wondering if the air moving under the hose at high speeds might restrict it a little bit.
