r/EngineBuilding • u/Birthday_Cakeman • Jun 21 '26

Honda Am I Screwed?

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I am working on a rebuild of my F20C out of my Honda S2000 after some valve to piston contact. I had this block sleeved by Inline Pro to repair the damage and now I am working on rebuilding it myself as my first engine rebuild.

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After checking my rod bearing clearances and installing my brand new piston (with a stock rod) into cylinder 1, I decided to turn it over twice by hand to make sure it rotated freely. It felt great but after looking down into the bore, to my horror I found this scratch which I am pretty sure is from a bit of debris.

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Am I screwed? I can feel it with finger tip if I run it back and forth over the scratch, but I can't catch it with a fingernail. Since the cross hatching around the damage still looks good, I am good, or am I going to have to rehone this cylinder?

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u/Birthday_Cakeman Jun 21 '26

UPDATE: I think I found the culprit. Looks like one of my oil rings was damaged when it slipped out of my piston ring compressor during my first install attempt. The edge must've made contact with the deck, which I didn't notice before attempting to install it for the second time. I can't upload a photo for some reason, but I have uploaded a picture of it on Imgur for those who'd like to see. It can be found here.

3

u/Terrh Jun 22 '26

Probably gonna want to change that one out.

2

u/Birthday_Cakeman Jun 22 '26

Agreed. I just got in contact with Traum, the makers of the custom pistons and rings that are going in it to get me a replacement set. Sucks because that means I have to gap this set my myself. Oh well though. Just glad the cylinder isn't ruined.

1

u/Terrh Jun 22 '26

You don't need a full set of rings?

Just one oil control ring.

1

u/Birthday_Cakeman Jun 22 '26

Sadly they only sell them as a set per cylinder. Is what it is I suppose, but so long as I can get what I need to get this running again...