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Tech Area => General Buick Tech => Topic started by: Scoobum on November 25 2011, 12:35:19 PM

Title: Bore Size...How Far?
Post by: Scoobum on November 25 2011, 12:35:19 PM

How far can you bore one of these 109's out too? What would be the minumum wall thickness you could go to...to handle say...24PSI? Just curious.

Title: Re: Bore Size...How Far?
Post by: Charlief1 on November 25 2011, 02:40:03 PM

I know a few guys have gone .060 but the block was sonic tested first. Generally you shouldn't go over .040 to keep the cylinder walls stable.

Title: Re: Bore Size...How Far?
Post by: Steve Wood on November 25 2011, 05:11:54 PM

sounds right to me

Title: Re: Bore Size...How Far?
Post by: Scoobum on November 25 2011, 11:29:16 PM

Quote from: Charlief1 on November 25 2011, 02:40:03 PM

I know a few guys have gone .060 but the block was sonic tested first. Generally you shouldn't go over .040 to keep the cylinder walls stable.

Therein lies my question. What's the minumum thickness of the cylinder walls I can get away with? Getting a block sonic checked isn't an issue.

Title: Re: Bore Size...How Far?
Post by: Charlief1 on November 25 2011, 11:37:12 PM

What size is the block now?

Title: Re: Bore Size...How Far?
Post by: Scoobum on November 26 2011, 12:11:07 AM

I have one that's .030...but is sleeved. Scored up from a piston pin getting loose.