I was just googling 996 engine solutions for the heck of it and came across a company called Bisimoto. They make a steel cylinder sleeve, which isn't post worthy, but what I noticed is the outside cylinder wall has what they call "impregnatation of strutted ductile steel sleeves." Just an odd design, but makes sense to the layman in me. Adds more structural strength and increases the contact surface for better cooling. However, I thought whenever something was re sleeved they fixed the cylinder wall if it was d-chunking then removed a few millimeters of the stock cylinder wall the accept the new sleeve. This "re-sleeve" appears to remove the entire cylinder. I'm curious how sound the process really is. Maybe they slide these in afterwards and weld them in? Anyways, kids are in bed and I have nothing better to do.... http://bisimoto.com/2014/product/996...block-sleeving Impregnation humor always welcomed.
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YOUR RESEARCHCylinder sleeve, weird design.
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There is no d-chunk fix that doesn't involve removal of the entire sleeve, as least as far as I can think of. There are several engine rebuilders who offer total removal of the original sleeves and the installation of new sleeves. I have no direct experience with any of these engines. Not sure I like the longitudinal ribs. While it increases the surface area for the coolant the ribs would to me disrupt coolant flow around the cylinder walls and possibly result in pockets of steam forming. OTOH, it is possible the cylinder walls do not get that hot to where superheated steam pockets would form. Regardless, I sure hope I never have to sit down and select a sleeve type for any Porsche engine I own. I have no idea which one I would select.
Agree with Macster. The coolant is designed to flow from the bottom to the top of the engine so those ribs are totally blocking the natural flow being perpendicular to the flow. You can get the LN nickies for that price, which are laser welded onto the engine block. http://lnengineering.com/products/wa...m-nickies.html
Peter -If you are interested in this subject you may find the Hartech ,closed deck solution interesting.It is a lengthy read. http://www.hartech.org/porsche_996_9...ers_guide.html
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