Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - Engine Builders Only,... What Is The Cause Of FA20 Failures

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Quote:

Originally Posted by mrg666 (Post 3617490)

Adding half quart extra oil is not going to be helpful. My oil catch can gets filled up when I add extra oil. When I fill properly at the mid level between min and max of oil stick, oil catch can does not even fill up until the next oil change. Adding extra oil only clogs the injectors and hurts the engine. If I add even more, I am sure the engine will lock and blow up. The only way to increase oil pressure is changing the oil pump and enlarging the oil channels. I would not try anything else.

Just in case, wanted to post the warning.

Adding to that, as posted above, low rpm high torque boosted tunes are not good. This is not a muscle car. Even when boosted, the tune should have low torque at low rpm. Do not just floor the accelerator without downshifting.

And, revving the cool engine is the other killer cause.

Don't want to sound like an amatuer, even though I am, when it comes to these Subaru engines,......when you refer to your catch can filling up, when you run the oil level elevated from the OE range,.......is this catch can that you refer to only used in an aftermarket turbo charged application? I don't see one on our stock/OEM NA engine?

Quote:

Originally Posted by hotrod1442 (Post 3617500)

Things change significantly when you add boost to the equation. On my supercharged BRZ I run one but I haven’t driven it hard enough yet to see anything in it. On my NA track car I had one for a short amount of time and never had anything more than a light mist in it after a couple years of use running overfull so I pulled it. I run an accusump now so I don’t bother with overfilling on my NA car.

Quote:

Originally Posted by hotrod1442 (Post 3617500)

The catch can is an aftermarket addition and, yes, my engine is supercharged. As I learned with that addition, catch can was not necessary as long as oil is filled at recommended level and the car is not tracked. I wish I had not installed it.

I am also an amateur, technician of my car only.

I have a 12mm thick spacer between the sump and engine which adds about 400mL extra volume without increasing the oil level on the dip stick. I also run the thicker WRX pump gears in a modified pump housing/timing cover (stock 12mm, WRX 15mm from memory...). And I have an oil pressure gauge. Without a gauge you're just guessing.