GoodnightIrene Posted October 4, 2023 Report Share Posted October 4, 2023 I'm a bit torn here I got these NOS rings real cheap about a year ago for an engine refresh I was doing. I got caught up in life matters and the project took a nap. Upon revisiting the project now, I see that these rings are not compatible with the modern Silv-o-lite pistons I ordered. These rings rely on expanders that would slip into the pistons oil drain cavities. The original mopar pistons used drilled oil-drain holes that dident interfere with their operation. Sooo, the questions I have are: Could I simply delete these spring-steel expanders from the oil scraping rings to make them compatible? I have not yet seen any ring expanders in the two engines I've disassembled, a 230ci and 218ci inline 6. so did people just delete them? Are these NOS rings any good or will they just eat away at my cylinder walls? As I've noticed, they do provide considerable outwards force. Quote Link to comment Share on other sites More sharing options...
dpollo Posted October 5, 2023 Report Share Posted October 5, 2023 I have used this Chrysler Corp brand with satisfactory results. Quote Link to comment Share on other sites More sharing options...
GoodnightIrene Posted October 5, 2023 Author Report Share Posted October 5, 2023 13 hours ago, dpollo said: I have used this Chrysler Corp brand with satisfactory results. nice Have you used them with modern or NOS pistons? ? Quote Link to comment Share on other sites More sharing options...
dpollo Posted October 7, 2023 Report Share Posted October 7, 2023 do not remember, but I always check the grooves for depth. Quote Link to comment Share on other sites More sharing options...
GoodnightIrene Posted October 9, 2023 Author Report Share Posted October 9, 2023 The ring groove depth is not a problem; they are as deep as on the stock pistons. I decided to reverse the placement of the last two oil rings and simply removed the expander from the single piece cast iron scraper ring. That way, I don't have to concern myself with the chances of the expander spinning in the groove and finding its way into that massive drainage opening. I also read that the direct disadvantage to using cast iron rings with expanders will simply be more friction force and cylinder wear in the long run. This kit (power punch "oil master") is a band-aid solution for worn cylinders. If this set of rings compensates for the cylinder taper I have and reduces oil consumption, I'll be a happy camper. For those questioning whether or not to use nos rings, stick with the modern equivalent rings if you are getting your engine re-bored. Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 10, 2023 Report Share Posted October 10, 2023 9 hours ago, GoodnightIrene said: modern equivalent rings There really aren't any, unless by modern you mean made recently. If you mean modern design, not really. You have cast iron (bore eaters) and chrome faced (temperamental to break in) as your choices. 1 Quote Link to comment Share on other sites More sharing options...
GoodnightIrene Posted October 10, 2023 Author Report Share Posted October 10, 2023 you got me with the "bore eaters" haha Thank you, this really helped out. I really wasn't sure if anyone made anything other then the chromed or cast iron rings. What baffled me was that this OEM kit has expanders that made installing the ring compressor quiet difficult. I think I'll go with chrome rings in the future if this quick fix doesn't pan out. Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 10, 2023 Report Share Posted October 10, 2023 7 hours ago, GoodnightIrene said: I think I'll go with chrome rings in the future if this quick fix doesn't pan out. I just wish someone made moly faced rings for our engines, I am sure you could pay thru the nose for a set of custom rings. I have a 318 with factory moly rings that have well over 10k miles on it and you can still see the crosshatch in the bores. In any case, if you go chrome you will need machine work and pay close attention to the break in procedures and get your machinist's advice as well. Quote Link to comment Share on other sites More sharing options...
FarmerJon Posted October 10, 2023 Report Share Posted October 10, 2023 It would probably make more sense to have custom pistons made that take modern thin rings, even if the overall cost was a bit higher. What would be REALLY nice, would be if there was an affordable cast or hypereutectic, lightly modernized, stock replacement piston that was made to take a modern ring pack. Bonus points if it didn't drop the piston crown .020 below deck like all the standard replacement pistons do. 1 Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 10, 2023 Report Share Posted October 10, 2023 The freewheeling Tony Smith has Pistons like that and they cost a heck of a lot more than just a little bit. I think they have to use a custom rod too which only Jacks the price up even more. Quote Link to comment Share on other sites More sharing options...
FarmerJon Posted October 10, 2023 Report Share Posted October 10, 2023 I believe those are domestically produced, forged or billet pistons. From what I have gathered, a set of custom pistons will run $700-1000. A casting, like the Silv-o-lite stock replacements available, would be much cheaper to produce, even with some design improvements. $35-75 a piston should be achievable, but may have to be foreign made (like the Silv-o-lights most likely are) A casting with a more modern skirt, with thin, common rings, would give performance boost, but still meet the needs of most flathead 6 street builds. Even Tony Smith says that his forged pistons are unnecessary for a mild build. Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 10, 2023 Report Share Posted October 10, 2023 I think your pricing might be a little optimistic and I'm pretty sure none of the Piston manufacturers is going to be interested in doing anything like that unless you want to pay for them to do all the research and everything. In which case those fancy $1,000 for Pistons will end up being cheaper LOL Quote Link to comment Share on other sites More sharing options...
JBNeal Posted October 15, 2023 Report Share Posted October 15, 2023 On 10/4/2023 at 4:28 PM, GoodnightIrene said: I'm a bit torn here I got these NOS rings real cheap about a year ago for an engine refresh I was doing. I got caught up in life matters and the project took a nap. Upon revisiting the project now, I see that these rings are not compatible with the modern Silv-o-lite pistons I ordered. These rings rely on expanders that would slip into the pistons oil drain cavities. The original mopar pistons used drilled oil-drain holes that dident interfere with their operation. Sooo, the questions I have are: Could I simply delete these spring-steel expanders from the oil scraping rings to make them compatible? I have not yet seen any ring expanders in the two engines I've disassembled, a 230ci and 218ci inline 6. so did people just delete them? Are these NOS rings any good or will they just eat away at my cylinder walls? As I've noticed, they do provide considerable outwards force. If the NOS rings do not fit the new pistons, then use rings that will fit the new pistons and keep the NOS rings in their envelopes as a conversation piece. 1 Quote Link to comment Share on other sites More sharing options...
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