2nd hand turbo's - are these any good?

A forum member has asked to purchase my old stock turbo's, however one of them shows some damage on the compressor. Though they performed extremely well on my car for 30k miles of BPU, I'm unsure if these are fit for sale to a forum member.

The shaft does move a tiny amount, but no up/down movement at all. There's no sign of seal problems.

Opinions?

The compressors don't look too bad mate, but then again they are steel and can take a bit of damage. Were they used with an induction kit?

The main bit to check is the impellers (think that's the term - the hots side anyway!) as they are the ones that REALLY show up damage! If you take the v-band clamps off you can take the turbos apart (with a bit of gentle persuasion).

I was suprised to find that my compressor wheels had small chips out of them, like yours does in the first pic, quite few of the vanes had the corners missing.

Okay, thanks chaps, I'll split the turbo's from the rest of the manifold and check the impellers. The only bit that concerns me so far is the chipped blade on the #1 compressor.

You've got a fookin big lump out of one of the compressor blades mate!!

Wouldn't put that on my car. Its going to have balance problems.

Are they standard or hybrids??? Edit - You said they were stock.... Doh. Must read before posting!

A forum member has asked to purchase my old stock turbo's, however one of them shows some damage on the compressor. Though they performed extremely well on my car for 30k miles of BPU, I'm unsure if these are fit for sale to a forum member.

 

The shaft does move a tiny amount, but no up/down movement at all. There's no sign of seal problems.

 

Opinions?

Darryl...you certainly have you way around a car's body

The compressors don't look too bad mate, but then again they are steel and can take a bit of damage.

You meant to say aluminium Bob????

A big chunk out like in that first pic means something hard has been through quite fast and quite recently. Its broken the tip off one inducer end of the blade but not hit any others, so must have been on or near full boost otherwise there would have been a bit of debris tennis played up and down the induction pipe!

There's no smoothing of the edges of the broken bit, so its not a common occurance or old.

You meant to say aluminium Bob????

Really? I thought they were steel. Every day's a school day

will a chipped blade throw off the balance does anyone know?

will a chipped blade throw off the balance does anyone know?

anyone?

Yes it will Jon.

The further from the centre of the object the bit comes off, the more effect it will have due to its greater moment of inertia.

Think about that small weight on your wheel that balances the wheel/tyre combo. I bet you've driven with an unbalanced wheel??

The wheel only spins at a couple of thousand rpm, but at 70 mph the steering can shake like a b*stard. Imagine that same kind of shake on a turbo shaft at up to 150k rpm!!!

Luckily the turbo shaft floats on a bearing that itself floats in the housing, so the oil films can help to dampen some of the effects of this vibration, but any vibration above a certain limit (these are very finely balanced) will lead to self destruction.

In short, looking at a turbo is like admiring a beautiful woman; your eyes are drawn to the size of the housings and you're amazed by how well it will blow, but when you start seeing chipped teeth..... just think of the consequenes

Really? I thought they were steel. Every day's a school day

Except weekends!

Compressor is an aluminium alloy for low lag as it doesn't have to withstand high temperatures. Turbine is a high temperature steel or some wierd ceramic on J spec turbos.