Rusty Turbines, and other country music legends
09-05-2018, 10:39 PM
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Rusty Turbines, and other country music legends
Has anyone ever seen this? I took apart my GT2860's and found this. Looks like the low point of where the turbo sits collect water then rusts in the scroll. WTF? Had I seen this earlier I would have gotten the NiResist housings. Is this common with cast iron housings? I spend the $$$ to get new housing extrude honed before I found this. Last one is new extrude honed housing.
I was running C16/100 mix for fuel.
I was running C16/100 mix for fuel.
Last edited by k24madness; 09-05-2018 at 11:10 PM.
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09-06-2018, 10:16 AM
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It’s magnetic so it’s not lead.
I did some more digging on the web and leaded fuel combustion byproducts are very corrosive. That’s gotta be what’s going on. I planned to shift away from that anyway.
I did some more digging on the web and leaded fuel combustion byproducts are very corrosive. That’s gotta be what’s going on. I planned to shift away from that anyway.
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09-06-2018, 10:35 AM
#6
First thing I did when I saw your thread is google for c16 content, but VP fuels website gave me pages/walls of text so I gave up. Makes sense. Do you start the car for short periods of time often? Or does it get fully warmed up and/or flogged every time.
If you do lots of cold starts without burning off all the condensation, I bet your pcv system looks really nasty too
If you do lots of cold starts without burning off all the condensation, I bet your pcv system looks really nasty too
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09-06-2018, 11:01 AM
#8
Not sure but I doubt it.
While being supposedly more corrosive and water absorbing than pump gas, I've not seen it cause this much damage since I started messing with it in 2011, and every high hp turbo car I've done since then is on e85.
I think your solution of switching to a better hotside material is probably best in this situation
While being supposedly more corrosive and water absorbing than pump gas, I've not seen it cause this much damage since I started messing with it in 2011, and every high hp turbo car I've done since then is on e85.
I think your solution of switching to a better hotside material is probably best in this situation
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09-06-2018, 11:11 AM
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@ 18psi, to swap turbines now will set me back $1k (two + extrude hone + tax etc) and the only option I have is NiResist. Not really the greatest either. I really need to tackle the problem right and go stainless turbine. That involves a LOT of fab work. I wonder if ceramic coating will buy me some time?
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09-06-2018, 12:10 PM
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TL;DR: if you want to not deal with this again get something stainless or a new cast iron component with appropriate protective coating.
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09-06-2018, 01:47 PM
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Ni-Resist, specifically D5S, is significantly better than regular ductile for corrosion resistance and high temp strength. It is commonly used on exhaust components in gasoline engines. As far as I know, there are no coatings that can survive turbine temperatures. I think the best I've seen was like 200-300 C? Definitely not 900C. Lincoln Industries has a teflon coating that's extremely tough, but it's not capable of those temps.
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09-06-2018, 02:05 PM
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I spoke to ATP this morning. They’ve never seen anything like it. They run cast housings all the time.
I remember one of the OG’s talking about how corrosive leaded fuel is. The byproduct of burning lead is what’s really causing the issues from what I read.
I expected E85 to have more problems but in talking with ATP they said even that fuel does not have such a problem.
Thanks for all the great feedback guys!
I remember one of the OG’s talking about how corrosive leaded fuel is. The byproduct of burning lead is what’s really causing the issues from what I read.
I expected E85 to have more problems but in talking with ATP they said even that fuel does not have such a problem.
Thanks for all the great feedback guys!
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09-07-2018, 08:06 AM
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I just discovered what maybe the source of the problem. These are not standard T25 housings. They have the exhaust side cut down (machined) to allow for better downpipe geometry. The exhaust studs now penetrate into the turbine scroll. Now I am not rocket scientist but I have to believe studs/bolts will not survive in that environment. I bet the blow torch effect cleared out much of the stud and pooled in the lower portion of the scroll. I no longer have the turbines. They are off at the machine shop. I’ll run my threoy by him and see what he thinks. I’ll work on better pics too.
This started as a simple R&R turbo repair. Now it’s turning into something more. It maybe time to reengineer the turbo mounting. Garrett makes a V-Band turbine that looks to be a clean solution. Inlet and discharge diameters are compatible so this maybe the right way to go.
This started as a simple R&R turbo repair. Now it’s turning into something more. It maybe time to reengineer the turbo mounting. Garrett makes a V-Band turbine that looks to be a clean solution. Inlet and discharge diameters are compatible so this maybe the right way to go.
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