I don't think of them. I know that boost complicates the design of the air/oil separation features in the PCV system; if the system on a particular engine isn't quite effective enough then perhaps an aftermarket unit is appropriate.So what do you think of catch cans for turbo GDI engines?
Interesting video, although I could quibble about some of he things he says. It's been a long time since I went to the durability engine teardown inspection area, kinda makes me want to drive over some time and have a look. I couldn't really talk about anything I see, though. I suspect that a lot of my internal "well, that depends" commentary isn't too far off the mark.This is a great video going over the plusses and minuses of port and direct injection in nice detail:
One thing he said that I would caution about is his recommendation towards the end about switching from a factory recommended 0W-20/30 to a 5W or 10W. Above 100C, 10W-30 is thinner than 0W-30, and the hotter the temp the greater the difference is; I can't find the spreadsheet I had that calculates the exact viscosity difference but my recollection is that at 140C it's not trivial. Plus, there's a shear rate effect that happens in the hydrodynamic film that reduces the viscosity even more as a function of clearance and relative velocity between the journal and the bearing. I reckon that maybe the turbo bearing is the hottest, fastest spot in the engine... if everyone else is doing it and not having any trouble perhaps it's okay but I wouldn't want to be the first to try it if I was in the habit of flogging things really hard.
Last edited: