check out the scarring of my pistons...
04-04-2007, 05:40 PM
#1
most hood white kid
Thread Starter
check out the scarring of my pistons...
OK...so I got to work on the engine today, struggled with the key that holds the oil pump gear on for 30 minutes. that bitch wouldn't come out. got the pistons, crank, all that **** out. Didnt have time to really look at the bearings, crank didnt look like it had any scoring. here are some pics that I took with my phone. You can see the scarring in piston/cylinder number 1...
the piston
the cylinder
here is a normal looking piston....
normal cylinder...
what causes scarring like this? i will have pics of everything and better ones
the piston
the cylinder
here is a normal looking piston....
normal cylinder...
what causes scarring like this? i will have pics of everything and better ones
04-04-2007, 06:50 PM
#2
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Re: check out the scarring of my pistons... (egcoupe94)
Give us some more info on your setup. The generic answer will be:
1. running lean
2.piston to wall clearance too small
1. running lean
2.piston to wall clearance too small
04-04-2007, 07:23 PM
#3
most hood white kid
Thread Starter
Re: check out the scarring of my pistons... (Phil M)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Phil M »</TD></TR><TR><TD CLASS="quote">Give us some more info on your setup. The generic answer will be:
1. running lean
2.piston to wall clearance too small</TD></TR></TABLE>
sorry, I guess I should have done that...
JDM h22 block
p5p type S pistons
all four cylinders call for "B" pistons
these are either OS or "A" pistons
Im not sure, I have yet to mic the pistons to see what the actual bore.
A few months ago, I swapped in this h22, i didnt change anything, guy said he did all the work. I just bought it. The engine drank oil like gatorade, had very low compression and knocked on cylinder number one.
anymore info you need?
1. running lean
2.piston to wall clearance too small</TD></TR></TABLE>
sorry, I guess I should have done that...
JDM h22 block
p5p type S pistons
all four cylinders call for "B" pistons
these are either OS or "A" pistons
Im not sure, I have yet to mic the pistons to see what the actual bore.
A few months ago, I swapped in this h22, i didnt change anything, guy said he did all the work. I just bought it. The engine drank oil like gatorade, had very low compression and knocked on cylinder number one.
anymore info you need?
04-04-2007, 10:07 PM
#5
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Re: check out the scarring of my pistons... (egcoupe94)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egcoupe94 »</TD></TR><TR><TD CLASS="quote">JDM h22 block
p5p type S pistons
all four cylinders call for "B" pistons
these are either OS or "A" pistons
A few months ago, I swapped in this h22, i didnt change anything, guy said he did all the work. I just bought it.</TD></TR></TABLE>
In engine speak, that appears to be "Black Death", which occurs when the piston skirt to cylinder wall clearance becomes to tight. There are a number of reasons that this can occur.
Unfortunately, your pictures don't include all four cylinders, piston tops, or a head shot. From what I CAN see, it appears to be from detonation and/or "foreign material" ingested into the #1 and #2 cylinders.
p5p type S pistons
all four cylinders call for "B" pistons
these are either OS or "A" pistons
A few months ago, I swapped in this h22, i didnt change anything, guy said he did all the work. I just bought it.</TD></TR></TABLE>
In engine speak, that appears to be "Black Death", which occurs when the piston skirt to cylinder wall clearance becomes to tight. There are a number of reasons that this can occur.
Unfortunately, your pictures don't include all four cylinders, piston tops, or a head shot. From what I CAN see, it appears to be from detonation and/or "foreign material" ingested into the #1 and #2 cylinders.
04-05-2007, 06:07 AM
#6
most hood white kid
Thread Starter
Re: check out the scarring of my pistons... (dinko)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dinko »</TD></TR><TR><TD CLASS="quote">tuned? how many miles on the motor? </TD></TR></TABLE>
never tuned, never drove it over 100 miles. dont know about miles.
my friend thinks its from oil starvation, which could be true...
never tuned, never drove it over 100 miles. dont know about miles.
my friend thinks its from oil starvation, which could be true...
04-05-2007, 06:09 AM
#7
most hood white kid
Thread Starter
Re: check out the scarring of my pistons... (B20C5 Turbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B20C5 Turbo »</TD></TR><TR><TD CLASS="quote">
In engine speak, that appears to be "Black Death", which occurs when the piston skirt to cylinder wall clearance becomes to tight. There are a number of reasons that this can occur.
Unfortunately, your pictures don't include all four cylinders, piston tops, or a head shot. From what I CAN see, it appears to be from detonation and/or "foreign material" ingested into the #1 and #2 cylinders.</TD></TR></TABLE>
sorry, all I had was my phone to take some pics, I took a pico f the bad one, then one of the ones that didnt have any scarring. I will get better pics today. Maybe you all can help me out then.
In engine speak, that appears to be "Black Death", which occurs when the piston skirt to cylinder wall clearance becomes to tight. There are a number of reasons that this can occur.
Unfortunately, your pictures don't include all four cylinders, piston tops, or a head shot. From what I CAN see, it appears to be from detonation and/or "foreign material" ingested into the #1 and #2 cylinders.</TD></TR></TABLE>
sorry, all I had was my phone to take some pics, I took a pico f the bad one, then one of the ones that didnt have any scarring. I will get better pics today. Maybe you all can help me out then.
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