FTN's T4/SXE Build/Conversion Thread
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FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
It looks like a lack of greta tears to me
in all seriousness i sent to two of my engineering buddies for their opinion. Alot going on there.
maybe post here?https://www.eng-tips.com/threadminder.cfm?pid=330
ill post it on irate4x4 too if you want, some pretty smart guys on there. I dont have much to offer, it looks like slow break
in all seriousness i sent to two of my engineering buddies for their opinion. Alot going on there.
maybe post here?https://www.eng-tips.com/threadminder.cfm?pid=330
ill post it on irate4x4 too if you want, some pretty smart guys on there. I dont have much to offer, it looks like slow break
Its Comin Right for us!
Joined: Feb 2005
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From: GA
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FTE Chapter Leader
Joined: Jan 2005
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Likes: 4,730
From: Henderson, NV
Its Comin Right for us!
Joined: Feb 2005
Posts: 12,206
Likes: 2,663
From: GA
this sounds promising from that thread
"Obviously signs of fatigue cracking, which looks to have initiated at about 7 o'clock in the picture on the outside of the shaft. The progression and origin is consistent with primarily bending load, as is the final failure plane (perpendicular to shaft).
What I'm less sure of is what caused that loading - imbalance is the most likely source of bending load to me, but the only cyclic change is in magnitude and that only with change in compressor shaft speed, which means relatively few cycles of fairly low magnitude - for that to cause failure it would probably have to be significant imbalance and/or significantly higher than design speed. That being said, I am not sure what compressor surging looks like in term of shaft load - I would expect vibration and torsional loading, but I'm not sure if you get enough pressure imbalance across the wheel to cause significant bending load, and with rapid enough change to cause cyclic loading. Also, I would be surprised to see enough load to cause shaft fatigue without also having visible compressor blade damage."
What I'm less sure of is what caused that loading - imbalance is the most likely source of bending load to me, but the only cyclic change is in magnitude and that only with change in compressor shaft speed, which means relatively few cycles of fairly low magnitude - for that to cause failure it would probably have to be significant imbalance and/or significantly higher than design speed. That being said, I am not sure what compressor surging looks like in term of shaft load - I would expect vibration and torsional loading, but I'm not sure if you get enough pressure imbalance across the wheel to cause significant bending load, and with rapid enough change to cause cyclic loading. Also, I would be surprised to see enough load to cause shaft fatigue without also having visible compressor blade damage."
Last edited by Y2KW57; Mar 21, 2021 at 01:46 AM. Reason: Formatting change to denote quote from another website. Text color change to improve readability of quote.
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FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
Yeah I saw that post. I’d say he’s on the money for not having knowledge of the other runs outside of what was shown in the video. I’m hoping the BOV will take away a major contributor to turbo failure.
I see that forum is populated with a good amount of jokesters too.
I see that forum is populated with a good amount of jokesters too.
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From: WV
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Live and let live...
Leonard, good on you for taking macro images. Not only does it give us something to ponder and discuss, but you may the opportunity to share them with Borg Warner one day. There are a couple of Borg Warner plants somewhat near me, it would be nice if I could walk in and exchange it for you like at Walmart.
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FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
I went data logging today. I forgot to hit Record on the video camera until the very last run.
Be prepared for a very strange video with only gauges with bouncing needles and/or squiggly lines on the screen for a long while, possibly set to easy listening jazz music.
Be prepared for a very strange video with only gauges with bouncing needles and/or squiggly lines on the screen for a long while, possibly set to easy listening jazz music.
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It would be interesting to see the data logging on that run though.
Hotshot
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From: N.GA Mountains
Lead Driver
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2 jokes today. You’re on a roll!
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FTE Chapter Leader
Joined: Jan 2005
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Likes: 4,730
From: Henderson, NV
Paris?!
