Piston Rings 4.6

[Drich35]

i have searched for some time now on the difference between 4.6 romeo and windsor piston rings. Engine builder magazine said windsor has a shallow top ring groove on the piston and romeo has a deep too ring groove. When i look up part numbers they come back the same on ring sets. I would think back clearance would be excessive if windsor size top ring was used. I have a set of rings that are apparently windsor because they are narrow compared to the factory ones i had. Has anyone had this issue or know if they are ok to run?

 

[mogs01gt]

Lets start at the beginning....You are using stock pistons or after-market?

 

[Drich35]

Stock npi pistons. What i could find says newer rings are sized to fit both style pistons. I have looked up rings for a windsor and romeo and both have the same part numbers. Didnt know if anyone else has ran across this.

 

[squeak93]

The rings will all have the same aftermarket replacement. They all have the same ring groove size (even 03/04 cobra). You'll want to buy the material and coating that fits your specific needs and bore finish. (your machine shop can help with this as they'll know what grit the finish is).

 

[mogs01gt]

I'd look at a Chilton or Haynes manual. I can only find information for boosted/nitrous set ups specific to the piston manufacturer.