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Moly vs. Plasma-Moly Rings

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Matthew68
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Moly vs. Plasma-Moly Rings

Post #1 by Matthew68 » Wed Apr 03, 2019 9:44 pm

Is there a difference? Are they the same thing? I’ve not found any information that they are different so I’m just guessing that the plasma is usually left off.

Someone school me, please.

Cheers,
Matthew
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

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wsa111
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Re: Moly vs. Plasma-Moly Rings

Post #2 by wsa111 » Wed Apr 03, 2019 10:08 pm

Engines being built for serious competition will be far better off using Plasma Moly ring sets. These feature an extremely durable ductile iron top ring with Plasma Moly facing. This design allows the ring to seat quickly and to maintain its sealing integrity under the severe stress of racing. The second ring is a special low tension plain iron design. These taper faced rings are specifically designed to break in quickly and to keep oil from migrating into the combustion chamber. The SS50U stainless steel oil control rings are the absolute best in the high performance industry. This ring combustion gives dependable sealing and allows maximum power production.
Copied from the Chevelle forum.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6al & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
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Econoline
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Re: Moly vs. Plasma-Moly Rings

Post #3 by Econoline » Wed Apr 03, 2019 10:09 pm

I looked into this when I was building my engine and from what I remember finding in my research is that they are the same. All "moly" rings have the moly applied in the same way, plasma spray. I wish I had a reference for you but it's simply been to long now. One thing to be sure of with any moly ring is that the machinist knows b/c moly rings require a finer finish than plain cast rings. And the cost difference is so negligible that it really makes no sense not to go with moly rings.
It ain't gonna fix itself

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wsa111
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Re: Moly vs. Plasma-Moly Rings

Post #4 by wsa111 » Thu Apr 04, 2019 2:19 pm

Less friction with the moly rings & slick cylinder wals.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6al & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
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78merKri6
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Re: Moly vs. Plasma-Moly Rings

Post #5 by 78merKri6 » Thu Apr 04, 2019 8:49 pm

One more thing---early molly rings had a.010 deep groove filled with molly material.

Modern ones are plasma sprayed on , which is good I guess; modern technology.
sVehicles: 93 F150 4x4 300BB,stock w/dual outlet Clifords ; 78 Mercury Bobcat w/250SB andC4 auto 2800 stall,milled head, Holman- Moody cam,Offy,3 singles (Holley), port divider, homemade headers; 65 Mustang coupe 200 6 w/C4,stocker--driven&shown.

Matthew68
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Re: Moly vs. Plasma-Moly Rings

Post #6 by Matthew68 » Thu Apr 04, 2019 9:22 pm

Thanks, guys. So - what I’m getting out of this is essentially they are the same thing.

Thanks
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

63falcon4drwagon
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Re: Moly vs. Plasma-Moly Rings

Post #7 by 63falcon4drwagon » Fri Apr 05, 2019 1:48 am

Hastings Rings (cast iron),
"Easy on the cylinders,
Hard on oil."
I just bought a standard set of Hastings Rings on eBay for a low mileage 200 ci for $15.00 free shipping.
I found the same type of deals on eBay for top quality main, rod and cam bearings.
A complete set of 12 valves at RockAuto were about $36.00
My first car at age 16: 1956 Victoria 292ci .045 milled heads, Mallory dual point dist, Autolite 4BBL, three on the tree + 3.89 gears.

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Re: Moly vs. Plasma-Moly Rings

Post #8 by CNC-Dude » Fri Apr 05, 2019 4:26 pm

Matthew68 wrote:Thanks, guys. So - what I’m getting out of this is essentially they are the same thing.

Thanks

It simply is describing the method the moly was applied to the ring.
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