Scott 89t2

I got thinking about this when I made my TID a while ago. the one line that goes into the TID. that has the check vavle on it. it comes from the oil fill tube. I guess sorta like a PCV system on a piston? sucking in "crank" fumes?

wouldn't this line be sucking oil into the intake? I know piston engines do this. into the turbo, IC and intake pipes? If So It would probably be a good idea to buy a oil catch can to put on that line...

here is the greddy one which is more then you need and $$$



all you need is a sealed can with 2 vac nipples on the top. one to TID, and one to the oil neck line. any oil (if any comes ?) would fall into the can as it passes through the vac line and can, instead of going into the turbo.

does any oil come out that line?

NZConvertible

Rotaries don't have "blow-by" like a piston engine does, the Crankcase & Evaporative Emission Control System (as Mazda calls it) we have is just there to take fuel vapours from the tank and (I presume) oil vapours from the sump, and pipes them into the intake. The actual amount of oil is a fraction of what a piston engine's PCV system deals with. I left that little hose from the TID open-vented on my Cosmo for four years and never saw even a trace of oil from it. Those expensive aftermarket catch cans may look sexy, but there totally unnecessary. Even a DIY one is really a waste of time.

Scott 89t2

ok. that's why it was my thought of the day and not my mod of the day

but just because non came out of your disconnected line. doesn't mean oil doesn't get sucked in while it's hooked up...

NZConvertible

Not quite sure what you mean. That line dumps vapours into the TID, but nothing can get sucked back into it because there’s a check valve on the end (which I left in place).

Scott 89t2

it gets sucked into the TID from the sucking of the engine. where as your unhooked line would have no vacum on it. therefore nothing would come out on it's own.

I'm just trying to say that just because nothing came out of your disconnected line for 4 years. doesn't automaticly mean that no oil would come out while it was hooked up to the TID, and sucking on it.

however it doesn't mean that it does either... just that we need more testing besides your disconnected line to see if it does or not

NZConvertible

Yeah, now I see your point. It’s not being pushed out the line, so disconnecting it probably disables the whole system. I wonder what the effects of that actually are? I never noticed any problems with my Cosmo, but I figure Mazda had a reason for putting the whole system there. I known about the gas tank vapours, but I always thought the oil vapour thing was a bit funny. How much vapour can the oil produce sitting in a hot sump? Some I guess.

Scott 89t2

also buy looking at the FSM. for the S5 anyways. the line from the charcoal canister "T"s into the one from the oil filler. so the line at the TID is sucking on both at once. which means you had neither well if it's the same.

NZConvertible

Yep, I think you're right. I'm pretty sure the Cosmo's system was the same as the FC's.

Scott 89t2

now we just need someone else to jump in to see if any oil would get sucked in while it was hooked up LOL.... that might explain some of the oil build up in the IC pipes that everyone gets. maybe not all of it comes from the turbo seals.

ponykiller

what a freaking coincidence! I was just at my friend's house an hour ago checking out his car and we got to talking about this same thing. He said that he tried leaving the tube disconnected from his TID, and that it made a mess down the back of his engine. He now owns the Greddy catch can pictured above. Another guy I was talking to tonight made the point that having it vented into the TID is no different than having an OMP. So, hooking it to the TID is not bad at all, in fact it will oil the turbo a little and simulate a (much smaller version) OMP.

see ya,
Kris