PISTON RING GAP for future boost On LY6 Bored to 4.065
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Staging Lane
Joined: Apr 2018
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PISTON RING GAP for future boost On LY6 Bored to 4.065 Hey guys, so my last question before final assembly...I am currently building my engine and eventually, in the next 2 years I wanna LSA Supercharge it, but for now I wanna run a Texas Speed Stage 2 LS3 Cam, as I Am using LS3 heads on my cast iron 6.2. I want to gap for future Boost if thats okay. I was thinking the Top ring .022 and the Second ring .024. Does that sound ok for mile stock LSA boost levels? Also, I dont want to have blow by issues with .022 and .024 gap....will I be fine running it that way ? Any negatives? Any advice will be greatly appreciated.
I don't know the answer from personal experience but I know what to google on it lol.
Here's a pretty good thread on it
https://ls1tech.com/forums/forced-in...s-boost-2.html
Here's a pretty good thread on it
https://ls1tech.com/forums/forced-in...s-boost-2.html
Oh and don't forget to over bore .001 to .003 for nitrous and supercharge application. REAL WORLD I set my 418 up for a 150 shot so I new It would be a while before I ever did so I did not over bore and went with .025 on the top ring. I may have lost 10 or 15 hp but I was always happy with it running in the 10's with no issues With a 4.1 stroke and a .030 overboard. No piston noise, no blow by.
I have my rings gaped at .025 on my LQ4. I have been running it N/A for 2 years now and do not have any noticeable blow by or issues. I swear, one of these days I'll get my turbo on. LOL
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.028” primary and .022” secondary for boost on that bore size. Remember that heat tightens them up considerably. Which boost adds a bunch of heat We’re only checking and setting them at room temp. FWIW a factory GM LS3 (hand assembled from a stick GS Vette) comes .024” primary and .014” secondary
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