Quick question. Is there any benefit in running a Crankcase breather Filter?
I don't actually know the answer, but inclined to say no.
The evap system takes care if it.
Stock car ? if so then no better to leave it stock so the vac from intake helps suck out the pressure and vapours in the engine, if your concerned about oil residue getting sucked into intake you could fit a baffled catch can in the line and also one in the PCV as well, i had one in the PCV when i was turbo and it caught a little residue but not huge amounts, was going to fit one on breather as well but never got around to it before going back to stock, of course turbo makes breather/pcv work hard as potential more pressure in the crankcase but stock if engine is healthy should not breathe to hard to give issues, clean intake is best though so catch cans have some use on stock motors and when i get chance will be adding one to mine again.
I tried catch can. Was more trouble than its worth. Caught very little oil. I suspect it's mostly a reasonably fine mist that makes it into the cylinders.
It wasn't empty, to it does lead to a cleaner intake.. But yeah... On stock motor? Hassle
Ok thanks. I was just curious and didn't really know whether they were particularly functional on stock 1zz
Quote from: shnazzle on July 24, 2020, 16:01I tried catch can. Was more trouble than its worth. Caught very little oil. I suspect it's mostly a reasonably fine mist that makes it into the cylinders.
It wasn't empty, to it does lead to a cleaner intake.. But yeah... On stock motor? Hassle
The inlet is after the throttle body and generally the throttle body plate stays clean. Only the intake plenum becomes coated with that oil which is blow by gases. The positive crankcase ventilation serves three purposes.
1. Equalizing the pressure in the crankcase to help with pumping loses due to positive pressure resistance and main seal blowing out.
2. Evacuation of blowby gases that deteriorates the oil.
3. Having those gases recycled back into combustion so it can be burned and then filtered to the catalytic converter for emissions.
As you mentioned it's best not to mess with it.
There are some race car designs that use external vacuum pump to keep the crankcase under constant vacuum for a performance benefit.
Although the valves can get coated with this oil and foul up the detergency added to patrol prevent this from happening but unfortunately many direct injection cars have suffered because fuel is not sprayed on the intake valve.
I've always found a fair bit of gunk after the throttle plate on all of the TBs I've had off (more than I'd like), but it's minor.
So yeah, definitely not worth it.
Turbo and maybe even 2zz, I'd do it
Quote from: shnazzle on July 30, 2020, 15:22I've always found a fair bit of gunk after the throttle plate on all of the TBs I've had off (more than I'd like), but it's minor.
So yeah, definitely not worth it.
Turbo and maybe even 2zz, I'd do it
On some older cars from the 90s they vent before the throttle body and it would gum it up.
For my 2ZZ I leave it alone but for turbo cars where the engine was not designed for turbo charging a crank vent device might prove beneficial.
Most factory engines are designed well so it doesn't cause issues but unfortunately earlier version of GDI engines had problems. Toyota being a better engine designer solved this issue with their D4-S DI/port injection which allowed the valves to get sprayed with fuel so they can get cleaned off and there was a benefit with port injection in combination with DI.
Another way they are solving these issues is newer oils that the manufacture certifies.
Adding a catch can may seem like a good idea but its not based on any known issues with 1ZZ and 2ZZ engines which were designed well in this regard. The size and weight of those cans running more tubing just complicates the system and the neatness of the engine bay.
Quote from: Dev on July 30, 2020, 16:03Quote from: shnazzle on July 30, 2020, 15:22I've always found a fair bit of gunk after the throttle plate on all of the TBs I've had off (more than I'd like), but it's minor.
So yeah, definitely not worth it.
Turbo and maybe even 2zz, I'd do it
Adding a catch can may seem like a good idea but its not based on any known issues with 1ZZ and 2ZZ engines which were designed well in this regard. The size and weight of those cans running more tubing just complicates the system and the neatness of the engine bay.
I found especially this. I had a leak. Case and point. It's yet another place you can have a vacuum leak. Unnecessary complication
Quote from: shnazzle on July 30, 2020, 16:34Quote from: Dev on July 30, 2020, 16:03Quote from: shnazzle on July 30, 2020, 15:22I've always found a fair bit of gunk after the throttle plate on all of the TBs I've had off (more than I'd like), but it's minor.
So yeah, definitely not worth it.
Turbo and maybe even 2zz, I'd do it
Adding a catch can may seem like a good idea but its not based on any known issues with 1ZZ and 2ZZ engines which were designed well in this regard. The size and weight of those cans running more tubing just complicates the system and the neatness of the engine bay.
I found especially this. I had a leak. Case and point. It's yet another place you can have a vacuum leak. Unnecessary complication
Yes Agreed. When you try to solve a non issue you just created a new one.
This is the same with oil coolers. If you feel that the engine will be running hot use synthetic oil first and after that monitor oil temps using a gauge to actually see if you need one. An oil cooler just complicates the system and can create a new set of problems. Not all modifications are beneficial but sometimes a necessary evil depending on the situation.