Mahle 90mm cylinders - what's the difference with W values?
 

I've pulled down a 1974 2.7s engine that has Mahle Nickasil cylinders marked - 90ZN2 W5. One is damaged, so i'm looking for a replacement. I've seen many versions which appear the same except for the W number. These include W5, W6, W7 and W8.

Does anyone know what the W refers to? These cylinders don't have height group triangle marked anywhere.

Thanks, Jason

I came across something that suggested that the W7 and W8 are Alusil. Any further info greatly appreciated.

Id like to know this as well.

I can't answer your question, but what you want in a replacement cylinder is the same height. That is the number stamped inside the triangle.

If you’re looking for replacement, you need the number inside the piston, such as 90L16
If it’s Mahle. In the 2.7 Mahle, there is nikisil and alucil but with different piston casting numbers.
Deck height is most important along with knowing if it’s alucil or nikilsil
Bruce