Piston ring choice - AMCA Forum

FIREfish148 Posts Joined 1/20/ Location Kirkland, WA US FIREfish148 4/22/ 10:01am 4/22/ 10:01am Edited Date/Time 4/22/ 10:03am Rickyisms Posts Joined 10/5/ Location FL US Fantasy Rickyisms 4/22/ 10:09am 4/22/ 10:09am

FIREfish148 wrote:

Chance Posts Joined 4/1/ Location Carson, CA US Chance 4/22/ 10:19am 4/22/ 10:19am

Rickyisms wrote: Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double... Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double rings, since that's what my dad always recommended. Never had a failure, just wondering if anyone could give me some input on the pros and cons of each. To my knowledge double ringed pistons are less likely to have a catastrophic failure, but rev slower due to extra drag/weight. I rarely race anymore so I'm not looking for huge performance benefits to where it effects the reliability of the engine, was just curious on hearing everyone's opinions.

Rickyisms Posts Joined 10/5/ Location FL US Fantasy Rickyisms 4/22/ 1:12pm 4/22/ 1:12pm

Rickyisms wrote: Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double... Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double rings, since that's what my dad always recommended. Never had a failure, just wondering if anyone could give me some input on the pros and cons of each. To my knowledge double ringed pistons are less likely to have a catastrophic failure, but rev slower due to extra drag/weight. I rarely race anymore so I'm not looking for huge performance benefits to where it effects the reliability of the engine, was just curious on hearing everyone's opinions.

Chance wrote: I sent my CR 250 cylinder to Millennium awhile back. I had them replate the cylinder and, provide a matched piston. The piston was a single...

Brad460 Posts Joined 5/15/ Location Richfield, WI US Fantasy Brad460 4/22/ 1:14pm 4/22/ 1:14pm Bruce372 Posts Joined 4/1/ Location US Bruce372 4/22/ 1:20pm 4/22/ 1:20pm Rickyisms Posts Joined 10/5/ Location FL US Fantasy Rickyisms 4/22/ 1:25pm 4/22/ 1:25pm

Bruce372 wrote: A friend of mine dynoed 1 vs 2 ring pistons on a ktm150. After all the claims about friction and all that, you'd be surprised which...

Log Hopper Posts 296 Joined 6/17/ Location MN US Fantasy Log Hopper 4/22/ 1:35pm 4/22/ 1:35pm

Bruce372 wrote: A friend of mine dynoed 1 vs 2 ring pistons on a ktm150. After all the claims about friction and all that, you'd be surprised which...

Rickyisms wrote:

Chance Posts Joined 4/1/ Location Carson, CA US Chance 4/22/ 2:29pm 4/22/ 2:29pm

Rickyisms wrote: From my research it seems like the single does rev slightly faster. I think I will just stick with what has worked for me in the...

DynoDan22 Posts 769 Joined 9/7/ Location Victorville, CA US DynoDan22 4/22/ 9:26pm 4/22/ 9:26pm Bruce372 Posts Joined 4/1/ Location US Bruce372 4/22/ 9:49pm 4/22/ 9:49pm

DynoDan22 wrote: One of the main benefits of a double ring piston is heat transfer. Two rings will transfer heat from the piston into the cylinder more than...

Question Posts Joined 6/26/ Location FR Question 4/23/ 1:12am 4/23/ 1:12am Edited Date/Time 4/23/ 1:16am STLSharky Posts 464 Joined 11/12/ Location Edwardsville, IL US STLSharky 4/23/ 5:48am 4/23/ 5:48am

Rickyisms wrote: Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double... Getting ready to tear my 125 down and do the bottom end, new crank, and I'm sending the cylinder to millennium. I have always ran double rings, since that's what my dad always recommended. Never had a failure, just wondering if anyone could give me some input on the pros and cons of each. To my knowledge double ringed pistons are less likely to have a catastrophic failure, but rev slower due to extra drag/weight. I rarely race anymore so I'm not looking for huge performance benefits to where it effects the reliability of the engine, was just curious on hearing everyone's opinions.

JMX82 Posts Joined 5/9/ Location Hyllykallio FI JMX82 4/23/ 6:03am 4/23/ 6:03am sandman768 Posts Joined 3/21/ Location Saratoga Springs, NY US sandman768 4/23/ 7:06am 4/23/ 7:06am jk367 Posts 758 Joined 3/17/ Location NV US jk367 4/23/ 9:55am 4/23/ 9:55am Rickyisms Posts Joined 10/5/ Location FL US Fantasy Rickyisms 4/23/ 10:39am 4/23/ 10:39am

jk367 wrote: Nice info on this thread. Getting ready to do a top end on my 125 as well and would love all your thoughts on piston brands...

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Brad460 wrote: