piston ring end gap?

[930gt-40r]

I have mahle motor sport 98mm pistons cylinders for an 86 turbo motor. I plan on running 1.5 bar through the motor with some methanol, what would be the best compression #1 #2, and oil control ring end gap? Should I deviate from factory
97mm cylinder spec?

[930gt-40r]

???

[Bobboloo]

End gap just tells you how much wear you have. I don't think use really matters. I'd try to find out the tolerance limit from the ring manufacturer. It can differ between manufacturers, years and whether it's a compression or oil ring.

[930gt-40r]

So I gather that I should just pop the rings into the cylinders they way they came out of the package? I have always been instructed to clearance all of the rings to their future cylinder before using them.

I know I said "compression #1 and #2"- this is because either I got two sets of compression rings from Mahle, or the top two are one in the same in the case of the pistons and cylinders that I got. Usually the oil scraper has notch in the bottom, but this set consists of the two (tapper up) compression rings per cylinder.
I check the factory spec in one of my friend's workshop manuals, but I dont know if I should use the spec becuase of the amount of boost and the fact that I am not using stock piston, rings, and cyls. I am still confused...

[Bobboloo]

If your components are not stock then the factory spec doesn't tell you much unless the ring was designed as a stock replacement. I'd try to get the end gap tolerance specs from the ring manufacturer. The seller should be able to get the info for you.

The top two rings are both compression rings but sometimes they can differ slightly and other times not. If they differ then they would have been labeled whether they were for #1 or #2.

The reason I mentioned the oil control ring is because sometimes the end gap spec for the oil ring is different than the compression ring.

Are your pistons and cylinders new or used? If all your components are new and designed to work together then I wouldn't worry about it. You can insert one of the rings into the bottom end of a cylinder to make sure you have a gap but aside from that I wouldn't worry about ring gap. More important is that the pistons fit the cylinder and that both are within spec if they are used.

[930gt-40r]

Bob- Thank you for your help, I got the specs from Mahle Motorsports. They said .017 on the top ring, .015 on the second, and leave the control ring alone. The cyls are used and the pistons are new- but they spec'd out.
thanks again