Many of the pictures of broken stock pistons I’ve seen looked like the ring gaps could’ve pinched shut. The ring lands being weak is commonly thought to be the culprit, but I wanted to check into this. I looked for the stock ring gap specs, and they’re way too tight for even stock boost in my opinion. The only specs I could find show top ring gap specs to be .0098” to .0157”. Bottom ring gap specs are .0157” to .0236”. The ring lands may not be quite as bad as people think, and the rings may just need to be ground down a bit.
Has anyone tried regapping the stock rings before turning boost up to 20psi+? I feel like it may be almost necessary. Even in the loosest spec for the top, you’re only at .016”. I’m thinking it needs to be more like .021” top and .023” bottom. Blow by would be pretty minimal there, and you’d have a lot safer ring gap for a more performance oriented application. Any thoughts?
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Has anyone tried regapping the stock rings before turning boost up to 20psi+? I feel like it may be almost necessary. Even in the loosest spec for the top, you’re only at .016”. I’m thinking it needs to be more like .021” top and .023” bottom. Blow by would be pretty minimal there, and you’d have a lot safer ring gap for a more performance oriented application. Any thoughts?
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