vitos big bore piston ring install question

[bansheedave]

What direction do the rings install if they have a taper on them? Taper up or down?

 

[speedyslyder]

i would look for a number or letter on the ring.
usually that goes up...but to tell you the truth i have never seen those rings

 

[bansheedave]

I found the answer. The flat side of a tapered ring faces down.

 

[Herpderplol]

If only one of the 2 are tapered, the taper goes as the top ring

 

[Blaaster]

The taper is to allow gases to get in behind the ring to force it outward toward the bore.

 

[bansheedave]

I was helping someone out with there quad. I personally never used tapered rings. Everything I used has been squared rings that have been either marked or not. So I had to do some research. He installed the rings upside down and they jammed up on the locating dowel and ended up loosing all compression. This was before the bike was ever started to be more specific. He pulled the cylinder, flipped the rings and put it all back together and now it runs. And yes, I told him to pressure test and torque everything.