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Message: <blockquote data-quote="MustangChris" data-source="post: 667655" data-attributes="member: 10830">sleeving a motor is where they bore out the cyliner and place a tube down it. The tube (sleeve) is made out of stronger material than the block and therefore provide a stronger cyinder wall. This is common when you want to do a big-bore. Due to the stronger matierial of the sleeve, they dont hae to be as thick as the cylinder wall was originally for teh same amount of strength.for example: you have a 2L engine. your options are to bore it out to 2.5L or bore it out to 3L, sleeve it, and have a final product of 2.8L, with the same strength and reliability of the 2.5L.The other benifit is that you can choose what the sleeve is made out of. Alot of people avoid having pistons made out of the same matieral as the block (forged aluminum pistons with an aluminum block.) if you put a sleeve in there thats not aluminum, you can have an aluminum block with aluminum pistons. many people use ductile iron because its somewhat "elastic" opposed to cast iron....there are a few problems...if you have an aluminum block and pistons, they cool rather quickly. and because the sleeves are a seperate material, they will heat-up, cool-down, expand, and contrast at a different rate than the block and pistons...worst case scenario: sleeve sinking.one of your sleeves comes loose, i'll let your imagination take over from here on what that can do...heres a motorcycle sleeve that slipped.<img src="<a href="http://pic20.picturetrail.com/VOL1461/6266009/20575610/335079640.jpg">" target="_blank">http://pic20.picturetrail.com/VOL1461/6266009/20575610/335079640.jpg"></a></blockquote>