Oil/Air Separator on a 2020/21
- Thread starter Rainier42
- Start date
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Saker
Senior Member
There should be room on one of the inner fenders....
Air Oil Separator (V3) Dual Chamber AOS - Crawford Performance
Rainier42
New member
Unfortunately, on the driver's side there really isn't. Was on my 2015 but not on my 2020.
Saker
Senior Member
Not enough room on the passenger firewall?
Rainier42
New member
Possibly there is room there. Was just hoping I could run shorter oil lines.
Saker
Senior Member
Yep, I noticed on my 21, Toyota took up all the real-estate on the drivers side fender....
Scowling Tuna
New member
That's a really expensive oil catch can (IMO). I'm sure there's cheaper alternatives.
Are they really necessary on a 4runner?
No. They're not necessary on most cars, but Subaru "dictated" the need for them by building a terrible motor and made them popular.
If you have high crankcase pressure they can be useful and they have their applications, but they're a waste on most cars, especially non-forced-induction cars.
Saker
Senior Member
I’m sure there are cheaper ones... I just pointed to one that needs no manual draining and is currently being install by Subaru.
Necessary? Our engines pull vapors from the crankcase.....
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LandCruiser
New member
Not sure if this is needed or even a problem with the GR engine in the 5th gen.
s13koop
New member
After running turbo cars for years (SR20 & 1/2JZ's) with catch cans I wondered why I was seeing this posted here. Didn't realize Subaru was a reason.
Rainier42
New member
Had one installed on my 2015 Trail 4Runner and was surprising how much oil it picked up in a couple of months of highway driving.
Scowling Tuna
New member
Personally, I think it's a "fix" for a problem that doesn't exist. Given the number of 4Runners on the road, I think there would be enough evidence (word used loosely) that the higher mileage vehicles could attribute the catch cans as part of their success. But that doesn't seem to be the case.
I'm all for mods, small and large. I'm guilty of obsessing over the smallest things too, so I'm not trying to throw any shade your way, but maybe just help anyone that hasn't had any exposure to oil catch cans.
I'm all for mods, small and large. I'm guilty of obsessing over the smallest things too, so I'm not trying to throw any shade your way, but maybe just help anyone that hasn't had any exposure to oil catch cans.
rightyouareken
New member
If the 4Runner was direct injection without port injection I could see the use. Many direct injection vehicles use catch cans to TRY (key work TRY) to keep carbon buildup from forming on the intake valves. Since the 4Runner uses port injection which washes the backs of the intake valves with fuel, I see very little point of a catch can on the 4Runner.
90Duck
New member
Subaru
My other vehicle is a Subaru WRX with the FA-20 DIT (direct injection turbo) engine. I've read enough about carbon buildup on the back of the valves that I actually installed a Moroso oil catch can kit on that car. It does collect a fair amount of blow-by in the canister, so I'd like to think it is accomplishing something. The alternative is periodic walnut-shell blasting to remove carbon buildup from the back of the valves, which is a pretty complicated and expensive process from what I have gathered.
I have never heard it discussed as an issue for port injection engines in general where the fuel works as a solvent to keep the valves clean, nor for the 4Runner in particular. I think it is a solution looking for a problem in this application.
My other vehicle is a Subaru WRX with the FA-20 DIT (direct injection turbo) engine. I've read enough about carbon buildup on the back of the valves that I actually installed a Moroso oil catch can kit on that car. It does collect a fair amount of blow-by in the canister, so I'd like to think it is accomplishing something. The alternative is periodic walnut-shell blasting to remove carbon buildup from the back of the valves, which is a pretty complicated and expensive process from what I have gathered.
I have never heard it discussed as an issue for port injection engines in general where the fuel works as a solvent to keep the valves clean, nor for the 4Runner in particular. I think it is a solution looking for a problem in this application.
