Re: What am I looking at here ?
[Re: toddd]
#1985968
01/08/16 12:22 AM
01/08/16 12:22 AM
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Joined: Dec 2015
Posts: 11 South Australia
Retroboy
OP
member
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OP
member
Joined: Dec 2015
Posts: 11
South Australia
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What do the bearings look like?. I had the same "look" on a few of my pistons when my engine detonated. It also showed up on the main caps and block mating surface. Really shows up in the bearings. Spun a couple of rod bearings, metal through the engine, lost cam lobes etc. Mains looked OK all things considered.
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Re: What am I looking at here ?
[Re: Retroboy]
#1985974
01/08/16 12:27 AM
01/08/16 12:27 AM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Detonation will do that, what do the cylinder walls look like in the hole where that piston was? Are the piston skirts good or mark up or tore up?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What am I looking at here ?
[Re: Retroboy]
#1985986
01/08/16 12:41 AM
01/08/16 12:41 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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What do the bearings look like?. I had the same "look" on a few of my pistons when my engine detonated. It also showed up on the main caps and block mating surface. Really shows up in the bearings. Spun a couple of rod bearings, metal through the engine, lost cam lobes etc. Mains looked OK all things considered. JMO here but you lost the cam lobes first.. metal got into the bearings and the piston was just damaged in the aftermath... a cam doesnt lose the lobes in a moment it will take a bit of time.. again.. JMO
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Re: What am I looking at here ?
[Re: MR_P_BODY]
#1986008
01/08/16 01:02 AM
01/08/16 01:02 AM
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Joined: Dec 2015
Posts: 11 South Australia
Retroboy
OP
member
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OP
member
Joined: Dec 2015
Posts: 11
South Australia
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What do the bearings look like?. I had the same "look" on a few of my pistons when my engine detonated. It also showed up on the main caps and block mating surface. Really shows up in the bearings. Spun a couple of rod bearings, metal through the engine, lost cam lobes etc. Mains looked OK all things considered. JMO here but you lost the cam lobes first.. metal got into the bearings and the piston was just damaged in the aftermath... a cam doesnt lose the lobes in a moment it will take a bit of time.. again.. JMO Been a few years since I've played cars and have never had an issue like this but now I've found all about how they've taken all the stuff we need out of oil. Expensive lesson. How does the oil path go in a Chrysler - Oil pump to lifters then camshaft to crank mains then rods? The rod bearings are way worse than the mains including the back of the bearings? Cam bearing were chopped out as well but they could have been there since 1972 ??
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Re: What am I looking at here ?
[Re: Retroboy]
#1986021
01/08/16 01:20 AM
01/08/16 01:20 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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What do the bearings look like?. I had the same "look" on a few of my pistons when my engine detonated. It also showed up on the main caps and block mating surface. Really shows up in the bearings. Spun a couple of rod bearings, metal through the engine, lost cam lobes etc. Mains looked OK all things considered. JMO here but you lost the cam lobes first.. metal got into the bearings and the piston was just damaged in the aftermath... a cam doesnt lose the lobes in a moment it will take a bit of time.. again.. JMO Been a few years since I've played cars and have never had an issue like this but now I've found all about how they've taken all the stuff we need out of oil. Expensive lesson. How does the oil path go in a Chrysler - Oil pump to lifters then camshaft to crank mains then rods? The rod bearings are way worse than the mains including the back of the bearings? Cam bearing were chopped out as well but they could have been there since 1972 ?? I believe the lobe thrash was falling down on the rods.. then into the oil, pump, filter, lifter journals, mains, rods and from the mains to the cam up to the rockers
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Re: What am I looking at here ?
[Re: Retroboy]
#1986086
01/08/16 02:56 AM
01/08/16 02:56 AM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
Joined: Sep 2015
Posts: 1,096
Australia
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On Meth with less than 10.5-1 ? I thought that you needed 13+ for Meth ?
1963 Plymouth Max Wedge 1971 Barracuda
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Re: What am I looking at here ?
[Re: Retroboy]
#1986097
01/08/16 03:10 AM
01/08/16 03:10 AM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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Sure looks like foreign object damage to me. When is hard to say now but clean it up and run it
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: What am I looking at here ?
[Re: Al_Alguire]
#1986101
01/08/16 03:20 AM
01/08/16 03:20 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Sure looks like foreign object damage to me. When is hard to say now but clean it up and run it The second pic says that to me also... thats rough looking on the edge like something was banging on it.. not like detonation which tends to be smoother(but not always)... but your right.. a little clean up and run that one again I've run worse than that one
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Re: What am I looking at here ?
[Re: ozymaxwedge]
#1986102
01/08/16 03:24 AM
01/08/16 03:24 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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On Meth with less than 10.5-1 ? I thought that you needed 13+ for Meth ? Meth does like higher pressure.. but we had meth cars before the E-85 cars with production compression and they worked fine.. the only thing was the corrosion so we changed to E-85 instead
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Re: What am I looking at here ?
[Re: Retroboy]
#1986339
01/08/16 03:53 PM
01/08/16 03:53 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Might be just barely touching the edge of the chamber in those heads, that is one of the closest points in a J head and unless the chamber is polished it will leave a mark like that where it looks like course sand. That is the area where the piston rocks up and down the most so tight clearance will show up there first.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: What am I looking at here ?
[Re: Retroboy]
#1986342
01/08/16 03:54 PM
01/08/16 03:54 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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It don't look like it came from the oily side of the piston, may have got some tiny piece of debris trapped in the for a few revs.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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