SharkSkin

I'm not sure that adds much -- if either of the first two zipties fails, there is nothing to stop that nut from getting loose. If it were me, I would run two zipties, each one going through one hole on each fitting. That way you would need two zipties to fail before one nut could get loose.

Alan

Well - before I drove to Sharktoberfest (and before Dave's reply even) I already had modifed this further - I now have 2 loops through both holes in each port. one looped suggly around 1/2 of the threads and the other round the other 1/2 of the threads.

These are not really under much tension - but I'd expect either one alone would be enough to keep the lock ring from falling off.

I'll post some pictures with the next set I do...

I did put about 800 miles on during my trip to Sharktoberfest - got a little oil into the Provent (but not very much - the filter element was not fully wet).

I did still use a little oil on this trip but much less than before... (maybe just ~250ml)

Considering the PCV intake vacuum porting to the filler neck and passenger cam covers is still in place at this point I think these results are good and much as I had expected. That the Provent is seeing any oil suggests some is already being ingested from the filler neck before it can get to the provent.

I am now awaiting some custom made check valves for the intake side changes.
One for the main throttle body connection - I want this to be unidirectional (out of the crankcase only) and another to use as a vent to atmosphere from the same point with a 1-2psi crack pressure to a draft tube in case the total intake breathing capacity is ever not enough for the total blow-by (seems certainly possible) based on the intake port sizes.

I prefer this plan having the Provent vent off before the filter (@ 10 PSI) - since this is likely to create an oily mess if this happens much...

I will also use some higher flow check valves for the fresh air venting - I'm not fully happy with the crack pressures & flow rates of the ones I have today...

Alan

Herman K

Did you drive the 800 miles at moderate or various speeds and how much improvement (%) is the 250ml compared to the past based on the same driving style.

Best from QLD

Alan

Herman,
Normal driving for a long distance trip ~85 for hours with short blips well over 90.

I'd say its reduced by at least half - likely much more. While the Provent is mounted and plumbed on its intake side - the stock beathers aren't really modified that much yet...

I do have fresh air into the drivers side cam & no cam to cam balance tube - but all the other breathers are still stock.

That the Provent sees oil at all suggests there are times when the crank blow-by is too much for the small oil filler breathers (no surprise). Previously this would end up exiting via the passenger cam cover (there is nowhere else to go) - and some probably still does.

So the main contributors to reduction currently is probably from the oil baffle plate and scrubbies causing less oil/mist to be slung up the filler neck. So far I'm actually very happy with these results - exceeded my expecations.

The next phase will be more interesting wrt to reduction.

Whats taking time is that I'm having trouble locating appropriate check valves for this..(size, config, crack pressure & flow rates, chemical handling & temperature handling).

I am having some modular samples made-up - I asked for enough for a set for you too.

Alan

hans14914

Alan,

Can you post some more info on you valves? I am going to be trying to hunt down some directional valves here for my breather kit too.

Alan

Hans,
What are you planning to do for your install? Provent with porting of the output back to the intake - similar to what I am proposing or something quite different?

The check valve usage is pretty specific to the porting and the sizing depends on exactly what you are planning to do.

I'm looking at aggregating all the current intake ports - the filler ports can be used directly. However the cam cover port is designed to be bidrectional and in my configuration that would be bad... it would result in a part time bypass loop that would significatly reduce vacuum crank scavenging through the provent.

In stock configuration it is designed this way to allow at least some fresh air into the cam cover some of the time... my new configuration allows fresh air ~all of the time without this connection.

The other is for a draft tube blow off in case the total intake breathing is ever insufficient.

My sizes are therefore only about 1/2" for each check valve.

The capacity both of these + the 2 filler neck breathers exceeds the provent tubes capacity (effectively a bit more than 3/4" ID).

An option is to use readily available PCV valves for this - but these do not perform quite as I'd like (e.g. variable flow rate based on intake vacuum) - however if all else fails - I could make this work.. I'd suggest you check out these options - however asside from vehicle fit matrices its difficult to get any technical details on PVC valves...

Alan

Herman K

Thanks for the update and ordering the extra parts for me - I'll be offline for a few days "in the outback"