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In the middle of rebuilding my BP05. Found evidence of spun rods. Heard b6 rods work too. Looking for used but in good condition to just slap in with standard sized bearings. Thanks
I have a set from when I tore down my BP4W. The engine was running when I pulled it with ~170K miles on it. The car was turbo'd for the last 2-3K miles of that.
If you're interested I can get some photos and details tomorrow.
I have a set from when I tore down my BP4W. The engine was running when I pulled it with ~170K miles on it. The car was turbo'd for the last 2-3K miles of that.
If you're interested I can get some photos and details tomorrow.
I only pulled the cap off of one, but if you're still interested I can pull the others later. The only issue I can think of with them is that I took one to a science night at a school and the piston skirt was hitting the rod as it was handled. As far as I can tell that's just superficial damage, and only on one rod. Just wanted full disclosure. This is where the piston skirt was contacting the rod I have to assume the other 3 rods are in similar condition. Rod, cap and the bearings that were installed when it was pulled from the engine. After a light wipe with a rag.
Your guess is as good as mine, this was the first time I've pulled an engine apart. I would assume the marks would clean up with some polishing compound and some scrubbing.
I have no reason to think that there was any damage due to oiling or heat based on the bearings. The only reason the engine was pulled was to go to forged internals to support the turbo.
I saw this post at work today and meant to reply but got distracted (aka actually had to do work).
So unless the bearings were literally rotated when removed, I think your rods are fine. They look similar to mine when I pulled my running donor engine apart. Additionally, even if the bearing was spun, the rods aren't necessarily damaged. If that were the case I'd be looking for indications of overheating (bluing/iron oxide). I bought a used built engine way back when thinking I might be able to reuse some of the parts, but I was only was able to use 3/4 connecting rods out of that entire engine. The one connecting rod that I didn't even consider using was blue around the rod bearing. Lastly, if you did spin the bearings, it would've caused oil starvation issues and damaged the crank first. If your crank is good, your rods are 99% likely good.
I found this image online, and while it is on the wrist pin side, the bluing effect is the same.
I'm not super experience with engine building or anything of that nature, but if you don't get any good replies from people that are, you could post this as a question on r/enginebuilding on reddit and get some decent feedback.
That wrist pin area pictured is blued because some wrist pins are press fit and the rod ends must be heated with a torch to expand them to them press in the wrist pins.
There is nothing abnormal about the rods that were pictured. That being said, I would buy the cheap Chinese forged rods just for insurance against missing a shift and over-reving the engine. Many people stretch rods and fail them that way even without boost.
Polish any scratches in the crank gently. Spun bearings usually leave some marks.
That wrist pin area pictured is blued because some wrist pins are press fit and the rod ends must be heated with a torch to expand them to them press in the wrist pins.
There is nothing abnormal about the rods that were pictured. That being said, I would buy the cheap Chinese forged rods just for insurance against missing a shift and over-reving the engine. Many people stretch rods and fail them that way even without boost.
Polish any scratches in the crank gently. Spun bearings usually leave some marks.
Are you saying my rods are most likely good? I thought the black marks indicated heat damage.
I only pulled the cap off of one, but if you're still interested I can pull the others later. The only issue I can think of with them is that I took one to a science night at a school and the piston skirt was hitting the rod as it was handled. As far as I can tell that's just superficial damage, and only on one rod. Just wanted full disclosure. This is where the piston skirt was contacting the rod I have to assume the other 3 rods are in similar condition. Rod, cap and the bearings that were installed when it was pulled from the engine. After a light wipe with a rag.
Sorry, didn't get notified of this post. I'm heading out of town for a week today, so I won't be able to get them shipped out. If you're still interested next week we can figure it out.
The big ends of the rods that had spun bearings must either be resized or the rods replaced. The black marks are of no consequence.
Blue marks on the wrist pin of the one that was Googled is just from being heated for press fitting at a machine shop.
youre right the black marks are no consequence. I assumed the rods spun because people on reddit said so, even though theres no such damage to the bearing or crank showing this. I put on oil on a red pad and the black streak came right off with little effort.
Sorry, didn't get notified of this post. I'm heading out of town for a week today, so I won't be able to get them shipped out. If you're still interested next week we can figure it out.
i actually ended up actually cleaning the rods and turns out they are fine. Sorry to waste your time.
07-24-2024, 09:23 AM
BP or B6 connecting rods
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