2.0l TFSI Re-bore/hone

[Alex C]

Hi,

I have heard that there is a graphite coating to the cylinder walls to help with friction reduction

Is it necessary/possible to have this coating reapplied following a cylinder rebore/rehone? What would the consequences be of not reapplying the coating? Would the bore suffer excessive wear?

cheers
Alex

 

[Zafi]

If it's Nikasil it needs replating.
If it's Alusil it has to be overbored and a liner made of Alusil fitted and bored/honed/etched.

 

[Broken Byzan]

it's neither, it's blast honed, some kind of treatment to aid break in that doesn't work.

 

[Zafi]

So what is the actual bore material?

 

[Broken Byzan]

Cast iron.