John V outside agitator
Active member
- Joined
- Mar 25, 2005
- Location
- Sleezattle, WA, USA
I support John's analysis. Looks like detonation to me.
Check the shoulder of the piston... edge eaten away.
Imagine the side of the piston...yikes...
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I support John's analysis. Looks like detonation to me.
Check the shoulder of the piston... edge eaten away.
2nd statement: now staring closely at that picture, I can see pieces of the piston crown missing. Detonation, followed by piston chunks further gouging the head and piston.
Cleary, engine has ingested a staple, you can see it at the bottom of the pic...
OP, there is no way you didn’t hear this thing knock. You need quieter exhaust or knocksense.
Uhh..... no.
Staples are more square-cornered.
This is obviously the letter "C".
I honestly didn't hear anything. Swear to God.
Probably going to invest in a knock sensor... and muffler. I have a vibrant resonator but no muffler. Not that loud but not quiet.
I also do have a wideband that used to be on the dash but now hides in the glovebox.
The OTHER pistons look much better. One of them is fine but there's a little acne going on. Not nearly as bad as the front-most piston.
I also remember when this engine was in my other car, it once or twice 'kicked back' when under boost. Pretty aggressive kick, kinda like if you were to sidestep the gas then get back on it.
Regardless I'm going to get new pistons soon and either get a new short block or hone the walls if they look good Just was curious what everyone thought.
That's damage from a foreign object, not detonation.
Detonation often leads to a something being broken out of the piston (ring, land) , which will then bounce around causing similar damage.
Source: I intentionally blew up motors from detonation for research. Because college.
FOD!
I'd clean up any sharp burrs that stick out (if there are any), but otherwise not worry about it. Small bits of metal sticking out could get hot and encourage detonation.
Culbertson...you need to learn you have extremely limited experience, college or not.
Your manner of always speaking/writing in absolutes shows un-sound reasoning.
Doesn't your claimed belief system warn against vanity?
Then why do you behave the way you do?
That's damage from a foreign object, not detonation.
Detonation often leads to a something being broken out of the piston (ring, land) , which will then bounce around causing similar damage.
Source: I intentionally blew up motors from detonation for research. Because college.
I believe the c is for the piston size.
The material redeposited on the piston crown?One last thing ('bout to clock in...)
Along with the erosion of the shoulder of the piston, this one particular feature is so distinctly indicative of detonation that I am surprised noone else has mentioned it yet.