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liners vs cylinder plating

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I was watching a show on how Ferrari engines are built, and I was kind of surprised to see that cylinder liners were used.  No details were given on the sleeve construction, but it sure looked pretty "old school", and it each sleeve was hammered into place (guided by a jig) by a working using a mallet, just like I used to do with my early 80's air-cooled kawasaki and suzuki liter bike blocks!

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Here is the pro/cons of each, both will work well and just comes down to the most part economics.

 

Pros and Cons

Re-Plated Cylinder Bore

Pros

*Small advantage in heat transfer

*Slightly better wear factor

*Somewhat lower co-efficient of friction

*Weighs a few ounces less

Cons

*Costs slightly more

*Can't be bored when damage occurs

*More fragile

*Can flake and peel

Iron Sleeved Cylinder Bore

Pros

*Costs less

*Bore able for future over sizes

*Hone able to keep bore true and proper ring seal

*Can be worked with common tools

*Can be replaced when needed

Cons

*Slightly slower heat transfer

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I'm pretty sure Ferrari cylinder liners are nikasil coated aluminum. They are not iron liners like old school bikes.

Edited by CamP

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You're also forgetting that an iron liner doesn't expand at the same rate as the piston does, which results in cold siezures....unless the liner is bored a little larger to prevent it....in which case the piston skirts will slap the cylinder walls, and eventually break them. Also, that same iron liner will not expand with heat as quickly as the aluminum cylinder will, which could cause the iron liner to shift in the cylinder. Iron liners in an aluminum 4 stroke block can shift all they want. Those cylinders don't have ports

Edited by 717 MOTORSPORTS

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