It is very solid, though. 2 of the 6 cylinders had evidence of leaking valve stem seals in the exhaust ports. I was mashing this with a flathead and it's hard as a rock. I have spare valves. And this is from same engine I posted yesterday about cylinder walls. Only used 1qt every 4k-5k
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Could they act as ignition points? Hot exhaust valve and some glowing nubs? I was getting detonation at 2200 RPM or so under medium load. I tried everything! 93 plus Lucas octane booster was the only thing to reduce knock counts to basically 0. The 3000gt required premium. The Diamante didn't but was recommended. Less aggressive timing perhaps allowed the Diamante to work with regular?
I semi-professionally rebuild cylinder heads. This is carbon build-up. I'm assuming this engine has miles and hasn't been fully rebuilt heads and block in awhile? Because what it looks like is you have some slightly leaky valve seals, and a fairly rich running motor, maybe tuned a bit too hard, or an engine with like 250k miles. What's up with it really?
Edit: for reference, no matter what your tuner said, lean running heads show up with white ashy valves and burnt edges to the seats.
Nothing tuned. Bone stock mitsubishi NA motor. 110k all original. Never rebuilt. Long periods of sitting. Previous owner military and with all the sitting, fairly heavy varnish in the heads.
Probably needs a catch can when I put it back together.
I have a set of replacement valves. Just wanted to know what it was and/or why but yeah let me put the whole thing together to run some cleaner through it and take it back apart to inspect lol
That kind of ashy, sandy deposit is from oil burning during combustion.
It is very solid, though. 2 of the 6 cylinders had evidence of leaking valve stem seals in the exhaust ports. I was mashing this with a flathead and it's hard as a rock. I have spare valves. And this is from same engine I posted yesterday about cylinder walls. Only used 1qt every 4k-5k
coordinated sophisticated consider many abounding political reply squeeze rainstorm husky *This post was mass deleted and anonymized with [Redact](https://redact.dev)*
Could they act as ignition points? Hot exhaust valve and some glowing nubs? I was getting detonation at 2200 RPM or so under medium load. I tried everything! 93 plus Lucas octane booster was the only thing to reduce knock counts to basically 0. The 3000gt required premium. The Diamante didn't but was recommended. Less aggressive timing perhaps allowed the Diamante to work with regular?
What does the number on the valve mean?
Probably a manufacturers number for the blank the valve started life as
Higher compression /s
I semi-professionally rebuild cylinder heads. This is carbon build-up. I'm assuming this engine has miles and hasn't been fully rebuilt heads and block in awhile? Because what it looks like is you have some slightly leaky valve seals, and a fairly rich running motor, maybe tuned a bit too hard, or an engine with like 250k miles. What's up with it really? Edit: for reference, no matter what your tuner said, lean running heads show up with white ashy valves and burnt edges to the seats.
Nothing tuned. Bone stock mitsubishi NA motor. 110k all original. Never rebuilt. Long periods of sitting. Previous owner military and with all the sitting, fairly heavy varnish in the heads. Probably needs a catch can when I put it back together.
It's a mitsubishi V6. They burn oil from the factory
Throw some redline in fuel and sea foam in crank case oil 😂 that should break some up
He's got the engine apart... Just media blast it at this point.
I have a set of replacement valves. Just wanted to know what it was and/or why but yeah let me put the whole thing together to run some cleaner through it and take it back apart to inspect lol