i have the dreaded ticking so i am prepping for a rebuild.

I have a shortblock i bought months back. all the cylinders look ok, no grooves, etc, but one has had what looks like water sitting in it after it was removed.

there is some black staining where water looks like it was sitting int he cylinder.


my question is....

i cant find any machine shops that work on the hypereuctectic cylinders, so....

should i buy the pads, paste, etc from sunnen and do myself, or does anyone have a recommendation of a shop that can do the work.

 

The bores used in the Cayenne V8 are normally referred to as "Alusil". US Chrome is familiar with the process as well as these guys (link below). Piston to cylinder wall clearances are so precise its best to have a expert take a look at it.

Do you have a NA or a Turbo?


http://www.kuhnperformance.com/model...ilding-service

 

thanks.

I understand that the cylinders dont really wear. it this correct?

us chrome only will recoat the cylinders. i would absolutely use them if the cylinders needing honing for scoring, etc.

i have used uschrome for 20 years on my race bikes, and boat motors.

had many good dealings with them

car is a NA 2008 cayennes

the kuhn performance is also nikasil,

i really dont think i need to have them bored and recoated, just cleaned up

 

I'm not a expert in the Alusil process at all but have heard the same that they "do not wear". I'm currently breaking down my first Porsche engine (928) and unfortunately the bores do have some scoring (170k miles). I was told by several sources that if the bores are in good shape you can just re-ring and reassemble since the bores supposedly do not wear (not my experience). However the NA V8's are prone to cylinder scoring because Porsche got the piston to cylinder wall clearance too tight from the factory. Now would be a good time to correct this if you plan on keeping the car. Majority of the cars that were affected by scoring were cars from cold climates.

 

They do wear, but not as fast as an iron cylinder. The only way you will know for sure is to measure them with a dial indicator and bore guage in many spots. How the rings will seat and leak down ends up there is no way to know. Seems like a lot of money and work for the chance you take. All the gaskets, o-rings and everything else really adds up.

 

this is why i am trying to find a shop to send it to....

no luck so far