ls1 with piston pitting

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Jan 18, 2014 | 06:21 AM

vyls1wa

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ls1 with piston pitting

Hi there

Just looking for some points of view on what steps I should take with this wonderful picture I have below.

It's something I found today after cleaning all the carbon off the pistons for a new cam and head install.

It's only on one piston and know it's from Pinging, some of the high n low spot are up to 1mm.

What I'm looking for is are you guys under the impression of a rebuild or wet n dry the piston and install the new heads, I dont want to risk the gear I've just bought, I will stroke it latter in, but wasn't expecting to spend that money now.

Thanks

Jan 19, 2014 | 06:01 AM

vyls1wa

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Bump,

Sorry to be a pain but really after some. People's opinions on this.

Jan 19, 2014 | 09:19 AM

Krom

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IMHO it doesn't look like deto to me, that looks like debris went through the engine, what does the head, and cylinder wall look like?

You can sand the sharp spots off and run it

Jan 19, 2014 | 09:25 AM

crazyelf

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Its fine, I wouldn't think twice about running it how it is.

Jan 19, 2014 | 09:53 AM

vyls1wa

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Head was exactly the same mirrored, but only on the flat surface of the head, you can also make out the shape of that part of the head on the piston.

ls1 with piston pitting-forumrunner_20140119_235143.png

Jan 19, 2014 | 10:15 AM

.boB

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From: Colorado Springs, CO

Quote:

Originally Posted by Krom

IMHO it doesn't look like deto to me, that looks like debris went through the engine, what does the head, and cylinder wall look like?

You can sand the sharp spots off and run it

A sort of agree. If it's detonation from too much timing or compression, it's pretty severe. But then you would see it in more than cylinder.

OTOH, if the cylinder goes lean or the plug gets too hot, you'll get that in only one cylinder.

Unless you're racing, I'd smooth that out and put it back together. But I'd also be looking at other components to find out why that happened.

Jan 19, 2014 | 11:30 AM

jmargo

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From: Nor Cal

Looks like a little debris went through. Make sure to check the valve seats. Whatever went through had a good chance to have been grabbed as the valve moved. Get the head surfaced, smooth down the piston and run it.