It's BS! :(

[Gilles]

Husker, if you decided go with the 3.8 cylinders I would suggest avoiding the steel cylinder inserts and go with the aluminum sleeves for a long term engine health..

[husker boxster]

Originally Posted by Gilles

Husker, if you decided go with the 3.8 cylinders I would suggest avoiding the steel cylinder inserts and go with the aluminum sleeves for a long term engine health..

Absolutely. That's why I don't want to go with the FL rebuilder. EvoSpec is using alum cyl with Nikasil coating. Almost eliminates the chance of bore scoring happening again.

[ike84]

Originally Posted by Gilles

Husker, if you decided go with the 3.8 cylinders I would suggest avoiding the steel cylinder inserts and go with the aluminum sleeves for a long term engine health..

maybe this is a stupid question, but what's wrong with iron sleeves? Strong, durable, easily sourced, and not dependent on any of this stuff? Tuners doing conversions from na to fi have been doing this for a long time with good results. Is there something about this engine that doesn't play well with iron sleeves though?

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[husker boxster]

Originally Posted by ike84

maybe this is a stupid question, but what's wrong with iron sleeves? Strong, durable, easily sourced, and not dependent on any of this stuff? Tuners doing conversions from na to fi have been doing this for a long time with good results. Is there something about this engine that doesn't play well with iron sleeves though?

Iron dissipates heat at a different / slower rate than alum, so your engine runs hotter.

[Gilles]

Originally Posted by husker boxster

Iron dissipates heat at a different / slower rate than alum, so your engine runs hotter.

Yes indeed, and eventually you could end having issues with the head gasket as well.. Vision Motorsports use steel liners on their race engines with good results, but these engines usually get disassembled and refresh after the race season or every other season and that seems impractical (and expensive..) for a street car.

[ike84]

Originally Posted by Gilles

Yes indeed, and eventually you could end having issues with the head gasket as well.. Vision Motorsports use steel liners on their race engines with good results, but these engines usually get disassembled and refresh after the race season or every other season and that seems impractical (and expensive..) for a street car.

What types of issues with the head gasket have those guys had?

I have zero real world experience with sleeving, so I only know what I can access online. But a quick trip to the fountain of knowledge shows at least one builder (vac motorsports) who routinely sleeve bmw alusil engine with flanged ductile iron sleeves with success in builds much more demanding than an NA m96.

Don't get me wrong, I'm not trying to knock raby or ln from an experience standpoint, but their prices are absurd and it seems like those are the only 2 guys who ever come up in engine discussions without any talk of the rest of the vast world of engine builders.

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