Anyone done it or got any Tech specs at all to what I need for the old zedster.

 

I know the tank has to be double the volume of the piping to it excluding the baffles, but will I need to T both breathers into one line or will I have to have a dual feed tank.????

 

My PVC's are full of oil again and smoking for Britian everytime I've been sat on the motorway at about 3000 to 3500 rpm Then come off and drive round town it smokes like a t@wt. If I use A roads and nail it it don't smoke when i then go into town.

Ahh i've found my little problem. So no catch tank.

Ahh i've found my little problem. So no catch tank.

:confused:

Spills the beans then mate?

Ahh i've found my little problem. So no catch tank.

What was the prob mate?

Re routing the PCV system seems to be the in thing in the US now mate, appears to work well too. You basically take the feed from the highest point being the top of the rocker cover, just means removing plenum to do it!

cheers

smithy

Re routing the PCV system seems to be the in thing in the US now mate, appears to work well too. You basically take the feed from the highest point being the top of the rocker cover, just means removing plenum to do it!

cheers

smithy

this makes total sense,all the high hp usa v8,s still vent from the rocker covers as allways. allways thought it was a dumb idea to have the vents at the bottom of plenum :(

Any links on how to do this?

My PCV's seem to clog up regularly with the extra boost they get and it's a pain having to remove and replace/clean them.

Any links on how to do this?

My PCV's seem to clog up regularly with the extra boost they get and it's a pain having to remove and replace/clean them.

 

Yep, and Woody is a man who knows his Zeds :)

http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=1019112

also interesting reading about catch cans

http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=1884979

hope that helps

smithy

Was talking to duffman the other night about this and he reckons he had owrked out a way to replumb the pcv valves, but it sounded like there was someone distracting him in the background :x:

Yep, and Woody is a man who knows his Zeds :)

http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=1019112

also interesting reading about catch cans

http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=1884979

hope that helps

smithy

 

You Darling Paul

 

i've been trying to find this artical.

 

The problem with the catch tank is that the PCV system which returns the oil back to the plenum is it's a presurised system and presure leakage would screw you mixtures. So The other option is to remove and seal the PVC points and use the venting from the intake cam covers and a low presure vent cap on the catch tank.

 

Still porential for probs though, but this is perfect.

No the above system doesn't purge the system properly. Look at the breather system diagram and you will see why. Fresh air is fed through the intake rocker covers, through the crankcase and out of the passenger side exhaust rocker cover. I wish people would try and understand the reasons for the breather system and the way it works before trying to **** it up....

No the above system doesn't purge the system properly. Look at the breather system diagram and you will see why. Fresh air is fed through the intake rocker covers, through the crankcase and out of the passenger side exhaust rocker cover. I wish people would try and understand the reasons for the breather system and the way it works before trying to **** it up....

 

So your saying that http://www.twinturbo.net/net/viewms...&msg_id=1019112 doesn't work because the fresh air feed would simpley flow stait in and out of the inlet rockers and therefor not purge the system effectively?

 

So would additional baffles on the outlet rocker breather pipes prevent the oil from flowing out while still allowing the gasses to flow.

 

Then that is merely adding more baffles to clog.

 

Or do you sugest Air feed to outlet rockers and PCV feed from inlet Rockers.

 

I know this. After reading the above and driving round roundabouts and all left hand bends gentley yet still nailing it every where else. I went to Manchester and back Via A and B roads (140 miles) and didn't smoke once. Not even a slight haze. So I know the PCV outlet rocker feed is the culprit and now I need to fix it.

 

The above looks good to me and worth a try unless someone has a better Idea.

Yeah I did wonder about swapping the feeds around but all you'll do then is dump the oil into the turbo inlet pipes instead. I posted on a thread a while ago about a solution with a catch can, I'll see if I can find it...

Here http://www.300zx.co.uk/forums/showpost.php?p=852972&postcount=54

 

Both PCVs are fed from the passenger side exhaust rocker cover, plug one up, use the other to feed catch can. Block off both PCV valves on plenum. Return from catch can goes via one way valve to idle feed on balance bar.... Watch how fast that catch can fills up LOL

Here http://www.300zx.co.uk/forums/showpost.php?p=852972&postcount=54

 

Both PCVs are fed from the passenger side exhaust rocker cover, plug one up, use the other to feed catch can. Block off both PCV valves on plenum. Return from catch can goes via one way valve to idle feed on balance bar.... Watch how fast that catch can fills up LOL

 

better than re-circing through the engine though, thus in theory reduces the chance of pre igntion/det when running more boost

 

so you going to supply a kit then mr duff? :)

Hmmm never thought of doing a kit will look into it :D Oil in the turbo inlet would mean the compressor running in a pool of oil which can't be a good thing - possible shaft twisting etc....

Here http://www.300zx.co.uk/forums/showpost.php?p=852972&postcount=54

 

Both PCVs are fed from the passenger side exhaust rocker cover, plug one up, use the other to feed catch can. Block off both PCV valves on plenum. Return from catch can goes via one way valve to idle feed on balance bar.... Watch how fast that catch can fills up LOL

 

how quick do ya reckon? :)

Well with the turbo inlets even lower than the PCVs probably pretty damn quickly lol...

Does the original oil cooler return pull or is it purely governed buy the oil feed regulator.

 

(Now this is just an Idea and I really haven't done anything other than run it through my bonce.)

 

See I just have mine blanked of and was thinking that if your catch tank had a oil return on a one way valve to the original oil cooler feed return loop and the gasses could return to the PCV valves.

 

I know there would conflicting presure problems with regard the to the purged gas and the regulator oil flow, but it's an other ideal in the mix and there may be some merit for someone to take a stange further. Or it could be totally barking, but there must be a way of solving this rather than slowing down for right handers.

Don't think it would work as there would be no pressure differential between the oil catch can and the sump tbh mate.

Yes I was thinking this could just end up pumping oil stait into the plenum, but wastn't sure if the sump was presurised. I'll have to do some research. In the mean time however my smoking problem has been fixed by changing from Mobil 1 0-40 synthetic to Millers Trackday 10-50 fully synthetic.

 

Obviously the Mobil 1 was just that thin it p1ssed into the system everytime I nailed it or slung it into right handers. Discovered driving like a granny stopped the smoke and though maybe a thicker oil would do the trick and it has.

doing the re route thingy is one of my next jobs lol

doing the re route thingy is one of my next jobs lol

 

If she's all re machined and every thing she'll smoke every now and then until she's run in properly anyway. then once she's run in a slightly thicker oil may solve the problem.

 

Mr Nissan recomended 10-40 semi synthetic or 15-50 fully synthetic and i think he knew what he was on about. So I wouldn't rush it yet. the thicker oil really seem to have cracked it for me.

lol i have no idea what it all means, i was lost a long time ago. It's the mechanic suggesting a catch tank but i don't know what they do.