2jzgte oil analysis after build

[Beasted]

hi and glad to be here!

I’ve had my engine built recently and after only 35miles it’s got a knocking noise, we think possibly top end but unsure until diagnosed

I did have the map sensor fail with this oil which would of chucked fuel in, at that time it also fouled the plugs, the run in map was a bit richer than stock also.

I changed the map cleaned the plugs and she fired again, I ran to temp and took this sample. I also cut my filter open and sivved the sump oil with 120microns and was good.

Anyone able to tell me if the recent oil sample on the forged engine look good.

Many thanks in advance

 

[PimTac]

That 4% fuel dilution with only 35 miles on the oil caught my attention.

 

[Beasted]

That 4% fuel dilution with only 35 miles on the oil caught my attention.

Yes I think this is to do with the run in map which was rich also the fact the map sensor failed in this time all adds to over fuelling on the run in period.
The plugs fouled straight after the map sensor failed too which point to fuel confusion. The main concern is ruling out bearing etc which point to cylinder components.

The map is going to be fine tuned and some fine checks on the engine to find the knock and sort.

would you say the wear materials are normal at this time?

 

[kschachn]

would you say the wear materials are normal at this time?

Lol, after 35 miles "wear metals" on a UOA are the least of your worries. It's meaningless at this point.

If there is knocking and it is materials related it most likely would not show up on a UOA anyway. Such catastrophic failure leaves behind chunks and pieces that are far too large to show up on an ICP analysis. Whether that's the case here I have no idea but given the description you gave in your post a UOA isn't the droid you're looking for.

 

[Beasted]

Lol, after 35 miles "wear metals" on a UOA are the least of your worries. It's meaningless at this point.

If there is knocking and it is materials related it most likely would not show up on a UOA anyway. Such catastrophic failure leaves behind chunks and pieces that are far too large to show up on an ICP analysis. Whether that's the case here I have no idea but given the description you gave in your post a UOA isn't the droid you're looking for.

Ive just edited the original post with more detail. I sivved the oil also and cut the filter for materials and it was normal, just a bit of silicone and a few silver Flecks all normal on a engine bedding in I would say.

I was told by a few people to get an analysis done, cut and check the filter element and sieve the oil.

The filter element and sivved oil were good, but I’m not sure what’s acceptable with wear materials

 

[kschachn]

You need to fix the knocking noise but this UOA isn't the tool to do that. There's nothing in that analysis that would assist you in correcting your problem except perhaps the very high fuel dilution. On a new build any UOA is going to be practically useless for diagnosis, especially after only 35 miles.

You're in the UK and you still go by miles?

 

[Beasted]

You need to fix the knocking noise but this UOA isn't the tool to do that. There's nothing in that analysis that would assist you in correcting your problem except perhaps the very high fuel dilution. On a new build any UOA is going to be practically useless for diagnosis, especially after only 35 miles.

You're in the UK and you still go by miles?

Ok thanks. I just wanted to be sure nothing was showing on that for now which would point to any wearing materials even at this stage of low mileage


Good to know for now that report is good, apart from the fuel contamination.

Yes from the uk and we go by miles mate

 

[PimTac]

I agree on the premise that the analysis is not going to help you here. A new or newly rebuilt motor is going to show higher metals and silicon. If you still want to run the analysis later on I would run a couple or three oil changes before doing that.

 

[Beasted]

I agree on the premise that the analysis is not going to help you here. A new or newly rebuilt motor is going to show higher metals and silicon. If you still want to run the analysis later on I would run a couple or three oil changes before doing that.

It’s more the knocking noise that started with this oil since the start up and initial drive to start break in.

I thought as the knock started when the oil was in that it may show something pointing to what it could be

 

[PimTac]

It’s more the knocking noise that started with this oil since the start up and initial drive to start break in.

I thought as the knock started when the oil was in that it may show something pointing to what it could be

This is a common misconception about oil analysis. The primary purpose of a oil analysis is to check the serviceability of the oil. If you run a analysis at each oil change then you might be able to see trends that would alert you to problems. Using a analysis to diagnose a engine issue is not what it is for.

 

[Artem]

Interesting thread. I too am confused by what you’re expecting outta this oil analysis. It’s not like the lab would be able to tell you “yep, something is wrong with the valve springs in cylinder 1” and you dive in and correct the issue in a jiffy. Not gonna happen.

who built the block? Take it back. Shouldn’t be knocking. Sucks to have to tear it apart again.