Thought some might find this interesting ?

[321boost]

Gerradi said:

AW111 said:

I managed this due to excessive detonation :

Ooh nasty, was it a weak mixture Or timing ?
I have a sneaking suspicion this is a clogged injector which would also cause a lean/weak mixture & detonation I guess...Apparently (not sure) these engines have had issues with the injectors as they have brought out updated injectors . Also its a Direct injection as opposed to port injection & they also can suffer from quite bad carbon build up.
I had to squirt in some DPF cleaner & carb cleaner to be able to see the top of piston clearly for cracks or chips etc , the others are quite black carbon as well. Anyway we'll only know when it comes apart & I am expecting to find piston damage, as yet another possible fault with these blasted engines appears to be that the pistons have a weakness in the land area. The alloy breaks up between the top & middle rings . It may look fine on a camera but once taken out its a mess....but I think this may have missed that as all the research so far suggests it was between 2011 & early 2012 so she may be lucky.

I am kind of struggling to see what you are showing in the pictures but that crack seems too smooth to be a crack and more like it might have happened overtime.
Wouldnt too lean a mixture trigger an engine code and could be verified using the short/long fuel trims?

[stevieturbo]

321boost said:

I am kind of struggling to see what you are showing in the pictures but that crack seems too smooth to be a crack and more like it might have happened overtime.
Wouldnt too lean a mixture trigger an engine code and could be verified using the short/long fuel trims?

You mean you cannot see that huge gaping hole from a piece of the exhaust valve missing ?

So much BS in this thread....

[321boost]

stevieturbo said:

321boost said:

I am kind of struggling to see what you are showing in the pictures but that crack seems too smooth to be a crack and more like it might have happened overtime.
Wouldnt too lean a mixture trigger an engine code and could be verified using the short/long fuel trims?

You mean you cannot see that huge gaping hole from a piece of the exhaust valve missing ?

So much BS in this thread....

I can see that. I don't understand properly what is being shown in the third picture? To the right looks like where the spark plug would screw into. And what BS have I written?

[stevieturbo]

321boost said:

I can see that. I don't understand properly what is being shown in the third picture? To the right looks like where the spark plug would screw into. And what BS have I written?

The BS is from many others.

The third original picture just shows as you say the exhaust valve with a huge chunk missing, and the spark plug area, albeit with the camera sticking through.

[AW111]

stevieturbo said:

AW111 said:

I managed this due to excessive detonation :

And it sure didn't happen at 1300-1700rpm just tootling along.

WOT @ 5000 rpm (on the dyno). My own stupid fault.

[Evoluzione]

Gerradi said:

No its not water Evo , I had sprayed some carbon cleaner down there for the camera.

What is carbon cleaner exactly and why did you spray it down there?

[stevieturbo]

AW111 said:

WOT @ 5000 rpm (on the dyno). My own stupid fault.

Yes, but the point is the OP's claim of it happening at low load/rpm, is just nonsense.

[Gerradi]

Evoluzione said:

What is carbon cleaner exactly and why did you spray it down there?

I sprayed some Mannol Foam DPF carbon cleaner, then some Carb cleaner & sucked it out. I wanted to see the top of the piston clearly for damage ,cracks etc.

[Gerradi]

stevieturbo said:

Yes, but the point is the OP's claim of it happening at low load/rpm, is just nonsense.

You seem really het up Steve, if you think that its all BS ,then why bother reading ?

[BrownBottle]

Gerradi said:

I sprayed some Mannol Foam DPF carbon cleaner, then some Carb cleaner & sucked it out. I wanted to see the top of the piston clearly for damage ,cracks etc.

Did you spray it down the spark plug hole after you removed it?

The pic of the spark plug has what looks like droplets of water on the electrode.

[Evoluzione]

What kind of animal do you think made these prints in the snow?
Well, they have DUNLOP written across them so probably human.
Oh sorry, I forgot to tell you, I walked all over them before I took the pics.
Ok, bye bye.

[GreenV8S]

stevieturbo said:

that doesn't just happen at random cruising about as you seem to be implying.

I can't guess what initiated the problem, but the ragged edge and cracks radiating from it make me think this probably ended as a fatigue failure. If so, the ultimate failure could have occurred at any load and speed.

[stevieturbo]

GreenV8S said:

I can't guess what initiated the problem, but the ragged edge and cracks radiating from it make me think this probably ended as a fatigue failure. If so, the ultimate failure could have occurred at any load and speed.

The smooth edges are burnt. Neither that valve damage nor the plug happened just tootling about at 1300rpm.

As with virtually every thread on here...there's more to it we are not being told.

[anonymous-user]

stevieturbo said:

GreenV8S said:

I can't guess what initiated the problem, but the ragged edge and cracks radiating from it make me think this probably ended as a fatigue failure. If so, the ultimate failure could have occurred at any load and speed.

The smooth edges are burnt. Neither that valve damage nor the plug happened just tootling about at 1300rpm.

As with virtually every thread on here...there's more to it we are not being told.

Interesting things happen to internal combustion engines that have no compression, because they also have no expansion ratio for the burning charge! "so what" i hear you say, well, the temperature of even a pretty poorly burning petrol flame is about a thousand degress centigrade, and thanks to the expansion normally, that heat is transfered from the charge and into the piston (it's how your engine actually makes useful work), and so when the exhaust valve opens, the combustion products and gas that exit have been "cooled" (actually they have been adiabatically expanded broadly speaking) to a temperature that the exhaust line components can withstand.

So, an engine running at lambda one, with little or no compression, even at low speed can quite happily melt away bits of itself...........

[anonymous-user]

This is pure PH gold. OP comes on to share something interesting that's happened to his car and someone weighs in with what a liar he is, how he's trying to mislead us all (for unspecified reasons), all we need now is someone (who actually lives with their nan at 48) to come and tell him he's scum for having a mortgage on his house and not buying his car in krugerrands for the full "PH tt" house.

Interesting reply from Max_Torque though.

Edited by anonymous-user on Monday 8th March 23:37

[stevieturbo]

stickleback123 said:

This is pure PH gold. OP comes on to share something interesting that's happened to his car and someone weighs in with what a liar he is, how he's trying to mislead us all (for unspecified reasons), all we need now is someone (who actually lives with their nan at 48) to come and tell him he's scum for having a mortgage on his house and not buying his car in krugerrands for the full "PH tt" house.

Interesting reply from Max_Torque though.

Edited by stickleback123 on Monday 8th March 23:37

Because it's how about 99% of such threads go, with the real information coming weeks later.

Maybe you're new to this section ?