Ruined bearings. Why?
Thread Starter
On The Tree
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What do lifters/bores look like?
Really need a complete assessment of the whole motor to best understand what happened..
How much run time on engine since assembled?
If #1 (front) main bearing (which feeds #1 rod) is fine then I'd figure something was in the crank gallery to #1 rod bearing to plug it it or debris to take out bearing.
Can't explain #3 main (thrust) bearing and #4 second from rear are bad yet no issue with rod bearings that those journals feed?
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On The Tree
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I don’t think so. I ran it NA the same way for a few years. Same bearings and pump, it’s an up-rated Melling pump. Has always produced higher oil pressure.
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On The Tree
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You forgot to share, what did the other bearings look like, including cam bearings?
What do lifters/bores look like?
Really need a complete assessment of the whole motor to best understand what happened..
How much run time on engine since assembled?
If #1 (front) main bearing (which feeds #1 rod) is fine then I'd figure something was in the crank gallery to #1 rod bearing to plug it it or debris to take out bearing.
Can't explain #3 main (thrust) bearing and #4 second from rear are bad yet no issue with rod bearings that those journals feed?
What do lifters/bores look like?
Really need a complete assessment of the whole motor to best understand what happened..
How much run time on engine since assembled?
If #1 (front) main bearing (which feeds #1 rod) is fine then I'd figure something was in the crank gallery to #1 rod bearing to plug it it or debris to take out bearing.
Can't explain #3 main (thrust) bearing and #4 second from rear are bad yet no issue with rod bearings that those journals feed?
I’m perplexed too. 🤷♂️🤷♂️🤷♂️🤷♂️
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"Not much with turbos" translates to how many minutes of run time since engine was torn down and reassembled?
I wouldn't say boost killed it. Guys are running twice the power and no issues. Why only those bearings if starvation?
I wouldn't say boost killed it. Guys are running twice the power and no issues. Why only those bearings if starvation?
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Verdad Gallardo How about the possibility of the cast crankshaft not being able to hold up to the pressure and began to flex therefore causing damage to some of the rod and main bearings?
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From: Norn Iron
If it was a crank related issue...more likely some sort of imbalance etc due to parts bolted to it
Thread Starter
On The Tree
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probably 1000kms at most. I don’t think starvation as it never lost pressure.
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On The Tree
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0 time on 2 step.
Postmortem is difficult.
I found the reasons for the metal in the oil in mine, and it was junk in an oil passage past the filter. It was my fault. Mine got the rear main then of course scattered to the rods etc. caught it early, polish the crank and change bearings.
Good luck with the refresh!
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Just my 2c here
- have seen a couple BBC do this with a HV pump /small pan capacity comb , but that should show up on your logs as high rpm pressure loss
- if the car launches well you could have momentary pressure loss from uncovering the pickup, check that part of the log
- with 2 turbos and plumbing you may have effectively lowered the running oil level by a small amount , guessing maybe 1/2 quart?
- don't want to start an oil debate here but not all synthetic oils are created equal . Long story short ,I had used rp oil for the first time on a proven engine and 500 miles later was going to pull it cause of steadily dropping pressure , at the last min decided to just change oil - no more problem even 3000 miles later with cheaper M1 . Oil breakdown, extra load on bearings from more power and any combination of the above could be the cause. Don't want you to go through the same thing all over again by repeating the exact combo - gonna have to change something
- have seen a couple BBC do this with a HV pump /small pan capacity comb , but that should show up on your logs as high rpm pressure loss
- if the car launches well you could have momentary pressure loss from uncovering the pickup, check that part of the log
- with 2 turbos and plumbing you may have effectively lowered the running oil level by a small amount , guessing maybe 1/2 quart?
- don't want to start an oil debate here but not all synthetic oils are created equal . Long story short ,I had used rp oil for the first time on a proven engine and 500 miles later was going to pull it cause of steadily dropping pressure , at the last min decided to just change oil - no more problem even 3000 miles later with cheaper M1 . Oil breakdown, extra load on bearings from more power and any combination of the above could be the cause. Don't want you to go through the same thing all over again by repeating the exact combo - gonna have to change something
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Thanks. Welcome to the club. 😊
Postmortem is difficult.
I found the reasons for the metal in the oil in mine, and it was junk in an oil passage past the filter. It was my fault. Mine got the rear main then of course scattered to the rods etc. caught it early, polish the crank and change bearings.
Good luck with the refresh!
Postmortem is difficult.
I found the reasons for the metal in the oil in mine, and it was junk in an oil passage past the filter. It was my fault. Mine got the rear main then of course scattered to the rods etc. caught it early, polish the crank and change bearings.
Good luck with the refresh!
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
Likes: 178
Thanks. Welcome to the club. 😊
Postmortem is difficult.
I found the reasons for the metal in the oil in mine, and it was junk in an oil passage past the filter. It was my fault. Mine got the rear main then of course scattered to the rods etc. caught it early, polish the crank and change bearings.
Good luck with the refresh!
Postmortem is difficult.
I found the reasons for the metal in the oil in mine, and it was junk in an oil passage past the filter. It was my fault. Mine got the rear main then of course scattered to the rods etc. caught it early, polish the crank and change bearings.
Good luck with the refresh!
Was obvious some junk went through the rear main. Aligned perfectly with the oil passage in the crank. Soft enough to hurt the bearing, but not the crank. Then of course got to the rods and other mains.
I had washed the block in the shop washer, which gets basically anything dumped in there for cleaning. Grungy suspension parts, filthy engine parts etc. Despite hosing it off and blowing out the passages etc......
Lesson learned!