Wrong ring to it?

[Billthebuilder]

Hello all I'm having an issue trying to fit piston rings for my 2.7 i ordered Goetze rings from our host and all the boxes are slightly different one even says Mercedes on the box! But all the numbers match up. The problem is the second ring is too fat to fit in the lands do I have the wrong rings or Pistons not original to the case?

[356RS]

Looks like you have the ring set for a 2.7 CIS piston. Ring size for the CIS pistons: Top ring-1.478 to 1.490mm, Middle ring-1.728 to 1.740mm and oil ring-3.978 to 3.990mm.
The piston in your photo looks to be a 90mm RS piston for MFI or Carbs not CIS. So you have the wrong ring set.

[Billthebuilder]

There doesn't appear to a different set for 2.7 they only list one for 90.00 bore. Could I use number 1&3 rings and source the correct middle ring?

[356RS]

What you need is the ring set for a 2.7RS. Part # 911-103-934-00

[Billthebuilder]

thanks for the help Mark since I opened 2- boxes I guess no return ill order the correct ones and put these in my f-up box. do you know if these rs pistons would be a good match for ez fuel injection ?

[356RS]

The 90mm RS pistons were originally made for 2.7RS MFI engine so yours are a perfect fit.

[Henry Schmidt]

Originally Posted by Billthebuilder

thanks for the help Mark since I opened 2- boxes I guess no return ill order the correct ones and put these in my f-up box. do you know if these rs pistons would be a good match for ez fuel injection ?

Check with Ken @ 911 Vintage Parts. He has a huge selection of individual rings on the self.
911vintageparts@earthlink.net
info@911vintageparts.com
or 760-731-4911

[Billthebuilder]

So I ordered new rings from our host (grant brand ) I'm not sure I like the looks of the oil rings the scrapper looks different than the Goetze brand and different than the old rings. Should I bale on the grants?

[Billthebuilder]

Still have not made up my mind! But leaning to using the Goetze oil ring and the 1.5 compression ring from the the Grant set