When do you re-ring?
12-17-2009, 12:02 AM
#26
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RE: When do you re-ring?
I run them until they croak.
Engines that I love (like my Super Tigre .90, my Super Tigre .45 and my Team Associated .15) will continue to live and breathe. I have extra sleaves, bearings, rings, pistons, and other assorted parts.
These engines I will have the rest of my life. I will run them in the future, regardless of any "Motor Laws," like mentioned in Rush's Red Barchetta
Engines that I love (like my Super Tigre .90, my Super Tigre .45 and my Team Associated .15) will continue to live and breathe. I have extra sleaves, bearings, rings, pistons, and other assorted parts.
These engines I will have the rest of my life. I will run them in the future, regardless of any "Motor Laws," like mentioned in Rush's Red Barchetta
12-17-2009, 08:38 AM
#27
RE: When do you re-ring?
ORIGINAL: pe reivers
Sport, That is the axial play of the ring you talk about. The dimensional wear I talked about is the radial wear. You can either measure it by ring end gap measurements by placing the ring in a part of the bore that does not wear, OR you can measure the ring cross section directly. For the latter measurement you need to know the dimensions of the ring when it was new
(very often not known)
Sport, That is the axial play of the ring you talk about. The dimensional wear I talked about is the radial wear. You can either measure it by ring end gap measurements by placing the ring in a part of the bore that does not wear, OR you can measure the ring cross section directly. For the latter measurement you need to know the dimensions of the ring when it was new
(very often not known)
OK, but I don't understand how that wear is hard on the lands, and come to think about it the land gap wear is mostly from the pistion lands deforming, not from ring wear. Ahh, perhaps because sloppy ring fit causes them to bend up and down in the gap. But are you talking about this wearing the land top and bottom width, or the bottom diameter?
12-17-2009, 08:44 AM
#28
RE: When do you re-ring?
I will run them in the future, regardless of any "Motor Laws," like mentioned in Rush's Red Barchetta
http://www.barchetta.cc/All.Ferraris/
12-17-2009, 08:56 AM
#29
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RE: When do you re-ring?
As the ring wears down it's outer diameter, the inner diameter moves away from the piston centerline. The ring is stationary relative to the cylinder wall, but the piston rocks in the bore, so the bottom ring land wears where it is in contact with the ring. If you wait too long with replacing the ring, the bottom ring land will show a conical wear pattern that does not fit the new ring any more.
You can dress the ring land in a lathe if you have the proper tools, but that needs removal of the sweat fit locator pin.
You can dress the ring land in a lathe if you have the proper tools, but that needs removal of the sweat fit locator pin.
ORIGINAL: Sport_Pilot
OK, but I don't understand how that wear is hard on the lands, and come to think about it the land gap wear is mostly from the pistion lands deforming, not from ring wear. Ahh, perhaps because sloppy ring fit causes them to bend up and down in the gap. But are you talking about this wearing the land top and bottom width, or the bottom diameter?
ORIGINAL: pe reivers
Sport, That is the axial play of the ring you talk about. The dimensional wear I talked about is the radial wear. You can either measure it by ring end gap measurements by placing the ring in apart of the bore that does not wear, OR you can measure the ring cross section directly. For the latter measurement you need to know the dimensions of the ring when it was new (very often not known)
Sport, That is the axial play of the ring you talk about. The dimensional wear I talked about is the radial wear. You can either measure it by ring end gap measurements by placing the ring in apart of the bore that does not wear, OR you can measure the ring cross section directly. For the latter measurement you need to know the dimensions of the ring when it was new
(very often not known)
OK, but I don't understand how that wear is hard on the lands, and come to think about it the land gap wear is mostly from the pistion lands deforming, not from ring wear. Ahh, perhaps because sloppy ring fit causes them to bend up and down in the gap. But are you talking about this wearing the land top and bottom width, or the bottom diameter?
12-17-2009, 02:54 PM
#30
RE: When do you re-ring?
you wait too long with replacing the ring, the bottom ring land will show a conical wear pattern that does not fit the new ring any more.
