Oil in Airbox
Oil in Airbox
09-10-2001, 04:39 PM
#2
Racer
Join Date: Jun 2001
Location: Sparks, Maryland
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It's not too bad. When you back off the throttle under boost, the air rushes back through the blow-off valve. As your turbo wears, it's going to "blow by" a little oil, and you'll find the entire air tract past the turbo (intercooler, etc) will be covered with oil in short time. The oil you're seeing is oil from the pressurized tract that has blown-through into the airbox.
If there's so much that it leaks onto the timing/balance belt through the belt-cover venthilation hole, you could prematurely deteriorate your belt(s). A subsequent Porsche factory bulletin had shops cap-off the vent holes to prevent this from occuring.
Greg
If there's so much that it leaks onto the timing/balance belt through the belt-cover venthilation hole, you could prematurely deteriorate your belt(s). A subsequent Porsche factory bulletin had shops cap-off the vent holes to prevent this from occuring.
Greg
09-10-2001, 06:18 PM
#3
Nordschleife Master
No, that is not right, he has a NA by his signature. And in a turbo I would get concerned if that much oil was blowing back to the airbox from the blowoff valve.
Anyway, I don't have a NA but would think a bit of oil could accumulate from the breather tube which is picking up air off the engine internals, i.e. from the valve cover or crankcase.
Anyway, I don't have a NA but would think a bit of oil could accumulate from the breather tube which is picking up air off the engine internals, i.e. from the valve cover or crankcase.
09-10-2001, 08:02 PM
#4
Race Car
I'm with IceShark on this one, All the cars I've owned with this type of Filter/Airbox seem to get a coating of oil. On CIS injection cars the air meter acts up when enough oil gets on it to throw off the balance.
09-10-2001, 08:28 PM
#5
2nd Gear
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Thanks guys -- I just bought it a few days ago (for practically nothing) to turn into a track car. It runs ok and I'm now in the process of assessing the initial fixes/upgrades.
09-10-2001, 09:21 PM
#6
Nordschleife Master
Yeah, I wouldn't worry if compression is good, since I don't know what accumulation is typical of 944 NAs. Those type of systems were designed as a polution control to pick up and burn the oil vapors and such that were being vented out of the crankcase. The inside of the crankcase develops positive pressure due to blowby of the rings. So if you find a bunch of oil in it check your compression.
