Loose carbon on top of pistons

[pauleyman]

What's your assessment of this stuff? Doesnt look normal. My real question is how long has this motor been down? This looks odd for a recently running engine.

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[curt-s]

Severe amount of additives?
Has she had a diet of junk food?

 

[pauleyman]

Severe amount of additives?
Has she had a diet of junk food?

No idea. This is the car I picked up recently. Owner said motor died 2 weeks ago. I'm not convinced

 

[curt-s]

Cylinder walls don't look "running 2 weeks ago" fresh to me.
The browner I see the deposits, the worse/more additives I see in gas, typically.

 

[pauleyman]

The car was still a good deal but I don't know specifics.

 

[DSMPT]

Maybe the previous owner bent the valves and that impact and valves smashed and destroyed carbon buildup? How do the valves look like?

 

[pauleyman]

Maybe the previous owner bent the valves and that impact and valves smashed and destroyed carbon buildup? How do the valves look like?

It bent 8 valves. I still haven't cleaned up the marks. Head is back from machine shop.

My only clue is the battery is dated Feb of this year.

 

[motomattx]

Valve stem seals or bad turbo seals causing oil consumption plus blowby being cycled back into the intake, but the carbon was knocked loose from something, maybe a coolant leak or valve impact.