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CrazyPrime

Wrencher

Join Date: Jun 2014

Posts: 286
#1

Strange piston damage

12-05-2015, 03:57 PM

What would cause this piston damage and would it require replacement? It was in a m20b25 with 150xxx miles.

Head is similar but not as bad.

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Coupelx

Advanced Member

Join Date: Oct 2013

Posts: 169
#2

12-05-2015, 04:09 PM

Id say it ate something at some point in its life. as long as it didnt pinch the ring groove you could run it.
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jeffnhiscars

R3V OG

Join Date: Jun 2011

Posts: 6010
#3

12-05-2015, 04:18 PM

Perhaps a broken spark plug tip bouncing around

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CrazyPrime

Wrencher

Join Date: Jun 2014

Posts: 286
#4

12-05-2015, 04:30 PM

Ring seats are perfect damage is localized to that one area on piston and head.

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digger

R3V Elite

Join Date: Nov 2005

Posts: 5856
#5

12-05-2015, 09:43 PM

Need to smooth the edge looks like it's being dinged up and sticking out the side

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AndrewBird

The Mad Scientist

Join Date: Oct 2003

Posts: 11892
#6

12-06-2015, 12:02 AM

Considering how plentiful used, good condition M20 piston are, I would just pick up a used one and not run that one.
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mr2peak

R3VLimited

Join Date: Aug 2008

Posts: 2388
#7

12-07-2015, 08:31 PM

How's the block?

Drive it hard. Maintain it well.

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CrazyPrime

Wrencher

Join Date: Jun 2014

Posts: 286
#8

12-07-2015, 09:10 PM

Block has zero damage.

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Northern

R3V Elite

Join Date: Nov 2010

Posts: 4902
#9

12-09-2015, 05:32 PM

looks like it ate something and it got squished into the head/piston at TDC

Originally posted by priapism

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Originally posted by shameson

Usually it's best not to know how much money you have into your e30
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