What Causes Blade Damage? Oil In Intake?

[beachside]

Hi, rb25det with hks turbo, car was garaged for a few years and a day at tracknoticed the blades evenly chipped and oil in intake side of turbo. Looking for advice to prevent and also tips to repair before disaster strikes. Cam covers piped to catchcan, so only return to intake is via bov. Thinking could be oil return lines blocked and being pumped through bearing seal into intake, then hitting amd damaging blades. If i clear oil return lines, should i also rebuild turbo?

How do i post a pic?

Thanks in advance

Bruce

[kitto]

Turbo sounds like it is rooted.

Sounds like it has a lot of play and the compressor wheel has been touching the compressor housing.

Oil is highly likely because the turbo seals are starting to fail.

Rebuild or replace turbo.

[R31Nismoid]

If the damage is in the centre of the blades and not around the edges, then it's nothing to do with the core.

Some debris has clearly gone through the turbo at some point so a good start point would be looking @ the filter choice/setup.

Won't be anything to do with the oil return as the stock return setup leads to oil in the intake anyway.

[Moodles2]

Compressor wheel chips I've seen from shitty chinese turbos, and also shitty highflow jobs.. the compressor material was questionable.

[hypergear]

Best to see an photo. Damages on the top means foreign object while on the side means cartridge failure or bent shaft.

Its rare to see an compressor wheel break while without the presence of foreign object or cartridge failure this days. This happens only if the compressor wheel it self is not designed for high shaft speed or high boost applications. Those type of wheel generally has very straight and tall blade profile, like certain version of the To4bs that are made for generators.

[beachside]

Hi Guys,

thanks for the feedback.

the wear is even of each blade, sounds like its debris through the cone type apexi filter? setup if filter, thru Z32 AFM then stock intake pipe with the cam cover return blocked off (returning to catch can instead).

while this would effect peak power efficiency, I just want realiability for track at the moment, do you guys think this is sustainable, or should I get the wheel replaced? indicative cost if I take the turbo body into a shop?

thanks

Bruce

[hypergear]

That appears to be foreign object damage.

[beachside]

my mistake in not oiling the cone filter? it would have been bone dry, so maybe too much dust/dirt passed through?

[Moodles2]

Apexi filters aren't oiled as far as I know, only K&N are.

[GTSBoy]

Anything other than a paper filter is not really a filter, just an ornament.

Edited September 8, 2012 by GTSBoy

[AngryRB]

how do you oil an apexi filter properly? what about a HKS mushroom filter, does that need oil too?

Edited September 8, 2012 by SliverS2

[R31Nismoid]

That is not cause by oil, or lack there of. That's dirt/fine stone/debris going through the comp wheel at some point.

I've had Apexi filters and never seen any damage like that.

HKS Mushroom filters have the name "poisonous" for a reason as they tend to collapse in the centre (on the inside) over time and send foam through the intake which isn't a good thing and you generally won't notice until it's lost a bit of material already... Seen two do it over the years. Would not use one given a choice.

[Old Booster]

apparently oil filters are not the best option with mass airflow meters, the oil vapor fowls the electrode,,,?

[GTSBoy]

Yuh, oil comes off the filter, gets on the hot wire. Hot wire cooks it until it carbonises.

This is not true of all mass air flow meters. Flappy door ones (olde schoole) are not bothered and Vortex counting types give no fark either.

[R31Nismoid]

apparently oil filters are not the best option with mass airflow meters, the oil vapor fowls the electrode,,,?

Lots of people use the oil K&N, it might be an issue technically... But it's certainly not prolific as no one can think of has had any issues including myself.

[AngryRB]

That is not cause by oil, or lack there of. That's dirt/fine stone/debris going through the comp wheel at some point.

I've had Apexi filters and never seen any damage like that.

HKS Mushroom filters have the name "poisonous" for a reason as they tend to collapse in the centre (on the inside) over time and send foam through the intake which isn't a good thing and you generally won't notice until it's lost a bit of material already... Seen two do it over the years. Would not use one given a choice.

thats good then cause im not keen on oiling filters, would having a cold air intake in the lower front bumper collect this kind of dirt/bad idea ? i know for wet weather its a bad idea obviously, but otherwise it seems perfect, series 2 that is.

Edited September 8, 2012 by SliverS2

[NoFigJamHere]

I'd also be worried were the debris ended up that caused the damage.. If you can get hold of a bore scope it may be embedded into the piston or cylinder head. Hopefully it just kept going on it merry way out the exhaust pipe. Its definately dirt,debris..Does the AFM still have the mesh in it?

[Moodles2]

Maybe there's a loose vacuum hose somewhere and a small object (rock, ball bearing etc) was sucked in

[beachside]

Do u guys know the workshop racepace use to rebuild?

[Piggaz]

Do u guys know the workshop racepace use to rebuild?

Their own engine room.