Cylinder leakdown higher after engine rebuild?

[Chanman1029]

This guy seems to have a similar problem with his rebuild - 3000km, consumes oil and scoring marks on the cylinder walls:

Luckily I’m not noticing anything oil consumption, atleast as of now. But those marks he has look very similar to the ones I have.

i got on a dyno last week, and made fair power, 314whp.
Epic motorsports tune, underdrive pulleys and electric fan, AA headers, no cats.

[Slideways]

This guy seems to have a similar problem with his rebuild - 3000km, consumes oil and scoring marks on the cylinder walls:

[bigjae46]

7?! Please explain lol. You changing out an engine every track event

I just got a great deal on a bunch of motors with issues. I was planning to build a spare S54. If my engine goes then I’m going LS, S85 or maybe a B58.

[Arith2]

Correct, sorry if I was not clear enough in the beginning about that.

I saw oil light and clogged oil filter so I thought it was the red oil light. Sorry about that.

[Chanman1029]

OP seems to be talking about the oil level light, not oil pressure light. this is why the oil company said burning oil might cause that. they most certainly did not claim that "piston rings are causing low oil pressure"

Correct, sorry if I was not clear enough in the beginning about that.

[digger]

Why don't we circle back to why the oil light came on... I'm already against wasting money on a pointless oil analysis. They're misleading almost always and clearing don't understand how oil pressure works. Previous oil burning could've just been slightly failing piston rings. That will certainly not cause a low oil pressure. Low oil pressure will cause scoring on cylinders though. If you're not consuming oil, then the scoring is more visual rather than damaging. All engines have some scoring which is fine. I went to reread the original and I'm not sure why an oil analysis company telling you piston rings are causing low oil pressure didn't raise a red flag immediately. That 15W-50 may have been a no go, especially if it hasn't happened since going back to BMW 10W-60.

I would definitely check oil pressure and make sure it isn't low. Let me get you some specs on that because stock specs will apply in this case.

OP seems to be talking about the oil level light, not oil pressure light. this is why the oil company said burning oil might cause that. they most certainly did not claim that "piston rings are causing low oil pressure"

[Chanman1029]

Why don't we circle back to why the oil light came on... I'm already against wasting money on a pointless oil analysis. They're misleading almost always and clearing don't understand how oil pressure works. Previous oil burning could've just been slightly failing piston rings. That will certainly not cause a low oil pressure. Low oil pressure will cause scoring on cylinders though. If you're not consuming oil, then the scoring is more visual rather than damaging. All engines have some scoring which is fine. I went to reread the original and I'm not sure why an oil analysis company telling you piston rings are causing low oil pressure didn't raise a red flag immediately. That 15W-50 may have been a no go, especially if it hasn't happened since going back to BMW 10W-60.

I would definitely check oil pressure and make sure it isn't low. Let me get you some specs on that because stock specs will apply in this case.

I have a digital oil pressure gauge, can confirm oil pressure was satisfactory when oil light came on. I believe that the filter being clogged from visible glitter (metal) in the oil that this was possibly slowing down oil draining to the pan, just enough to trigger the light, which I believe once on, stays on until the car is off.

My initial concern was when the metal contents doubled from my first oil interval, which was mineral oil, but this was langs recommendation

[Arith2]

Why don't we circle back to why the oil light came on... I'm already against wasting money on a pointless oil analysis. They're misleading almost always and clearing don't understand how oil pressure works. Previous oil burning could've just been slightly failing piston rings. That will certainly not cause a low oil pressure. Low oil pressure will cause scoring on cylinders though. If you're not consuming oil, then the scoring is more visual rather than damaging. All engines have some scoring which is fine. I went to reread the original and I'm not sure why an oil analysis company telling you piston rings are causing low oil pressure didn't raise a red flag immediately. That 15W-50 may have been a no go, especially if it hasn't happened since going back to BMW 10W-60.

I would definitely check oil pressure and make sure it isn't low. Let me get you some specs on that because stock specs will apply in this case.

[Slideways]

It’s been awhile but I’m a silent distributor of grant rings. I’ve sold a couple of sets mostly to help someone who was buying parts from the 7 broken S54s I once had.

7?! Please explain lol. You changing out an engine every track event

[bigjae46]

Very true, I actually tried, but this went down beginning of 2021 and covid was affecting supply of everything. I searched and couldn’t find anyone with them

It’s been awhile but I’m a silent distributor of grant rings. I’ve sold a couple of sets mostly to help someone who was buying parts from the 7 broken S54s I once had.

[tlow98]

You can get Grant piston rings for about $150.

I also looked for these and couldn’t get them. I went with NPR for stock sizing. Good reviews on them, and I hope to experience the same!

[Chanman1029]

You can get Grant piston rings for about $150.

Very true, I actually tried, but this went down beginning of 2021 and covid was affecting supply of everything. I searched and couldn’t find anyone with them

[bigjae46]

this isn’t by any means a race engine. It’s a street car, to be perfectly honest, the only reason I chose to buy $1200 CP pistons was because oem rings were $800, so financially it would be silly not to buy new pistons.

You can get Grant piston rings for about $150.

[Chanman1029]

Usually, a machine shop will coat it in an oil like WD-40 to keep it from corroding. But, because it was assembled, some of that coating could have been wiped or was not reapplied after assembly. During assembly, they will use some engine oil to get the pistons in the bores.

Well in that case, it stayed covered with wrap until I was ready to mate the block and head. I made sure to be careful with it. I only had it in the garage for about a month before I had it all put back together.

[Slideways]

Wouldn’t there be a ever so thin layer of oil in the cylinder walls anyways? Just hard for me to imagine how that got there. But as ive learned, corrosion is a constantly occurring process, you cant stop it, only prevent spread.

Usually, a machine shop will coat it in an oil like WD-40 to keep it from corroding. But, because it was assembled, some of that coating could have been wiped or was not reapplied after assembly. During assembly, they will use some engine oil to get the pistons in the bores.