ring selection
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Freshman User
Joined: Nov 2002
Posts: 46
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From: Las Vegas US
ring selection
Hey everyone, I need to decide on whether to get cast rings or chromemoly rings to go with the new hypereutectic pistons I'm gonna put in. Two factors I've learned are: 1 - ring gap difference from cast to hyper pistons due to ring pack placement (rings are closer to combustion chamber and therefore hotter, expand more in the hypers). 2 - The chromemoly rings are harder to get to seat than cast. Which will work better for the hyper pistons?
Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
ring selection
The hyper.. piston should fit with less clearance because they have less expansion. I would expect closer ring end gap clearance. Chromemoly is really a misnomer but those type of rings are nomally for racing aps.
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
ring selection
Originally posted by beartracks
The hyper.. piston should fit with less clearance because they have less expansion. I would expect closer ring end gap clearance. Chromemoly is really a misnomer but those type of rings are nomally for racing aps.
The hyper.. piston should fit with less clearance because they have less expansion. I would expect closer ring end gap clearance. Chromemoly is really a misnomer but those type of rings are nomally for racing aps.
not the piston size......
Postmaster
Joined: Aug 2001
Posts: 2,882
Likes: 0
From: Nevada
ring selection
Originally posted by Tronick
Hey everyone, I need to decide on whether to get cast rings or chromemoly rings to go with the new hypereutectic pistons I'm gonna put in. Two factors I've learned are: 1 - ring gap difference from cast to hyper pistons due to ring pack placement (rings are closer to combustion chamber and therefore hotter, expand more in the hypers). 2 - The chromemoly rings are harder to get to seat than cast. Which will work better for the hyper pistons?
Hey everyone, I need to decide on whether to get cast rings or chromemoly rings to go with the new hypereutectic pistons I'm gonna put in. Two factors I've learned are: 1 - ring gap difference from cast to hyper pistons due to ring pack placement (rings are closer to combustion chamber and therefore hotter, expand more in the hypers). 2 - The chromemoly rings are harder to get to seat than cast. Which will work better for the hyper pistons?
http://www.kb-silvolite.com/speclear.htm
2. Get the moly rings. The key to ring seating is the finish hone on your cylinder walls. Moly rings like a very smooth hone and will probably seat before your cam is broken in.
Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
ring selection
As far as rings goes, moly I perfer. Most people get the rings mixed up. You have cast rings then moly ring then chrome rings, These are the most popular, I know there are more. Moly rings get called Chrome Moly also, but the Chrome rings are hard rings.
Moly rings will seat very easy, as georgedavila stated they will seat befor the cam is broke in. I have heard they can even by the simple turning the engine over when installing pistons on the engine stand. I would have to say almost all Car companys use moly rings. Imports like the chrome rings.
Keith Black pistons need more ring gap. They have stated that they have the ring package high on the piston and the heat expands the ring more. I have seen heads of piston pulled right off and piston pin pulled out because of ring bind. Hyper pistons do not transfer heat as well as forged there for sending more heat out the rings.
Moly rings will seat very easy, as georgedavila stated they will seat befor the cam is broke in. I have heard they can even by the simple turning the engine over when installing pistons on the engine stand. I would have to say almost all Car companys use moly rings. Imports like the chrome rings.
Keith Black pistons need more ring gap. They have stated that they have the ring package high on the piston and the heat expands the ring more. I have seen heads of piston pulled right off and piston pin pulled out because of ring bind. Hyper pistons do not transfer heat as well as forged there for sending more heat out the rings.
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