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04-11-2017, 11:43 AM | #1 |
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Join Date: Nov 2013
Location: Prescott, AZ
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What is ring seat?
I know that when an engine breaks in, it is said that the rings seat.
I believe it must be related to the bore surface smoothing out so the rings run against a smooth surface (not sure). I noticed carbon buildup in the piston ring grooves, mostly in the compression groove. Here's my question. Is carbon buildup in ring grooves really a good thing? Does the buildup under the compression ring increase the pressure of the ring against the cylinder wall and thus form a tighter seal? Is this when the rings seat? Or is there no relationship to carbon buildup and the rings seating? Thanks
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Nothing wrong with it except for the name on the front. Alex Last edited by Bolts; 04-11-2017 at 11:52 AM. |
04-11-2017, 12:08 PM | #2 |
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Re: What is ring seat?
Carbon is a negative thing and not related to the rings seating in. Ring seating refers to the rings and the mating cylinder wall surface wearing to fit each other.
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04-11-2017, 01:43 PM | #3 |
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Location: Sweden
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Re: What is ring seat?
A piston ring isnīt square itīs shaped like a barrel, scraper etc.
From the beginning it has a very narrow contact surface against the cylinderwall breaking the oilfilm. During break in the piston ring contact area wears getting a bit wider and both cylinderwall and rings get the desired finish. The reason you need to run the engine under power during break in is to get enough ringpressure to break the oilfilm. If the rings fail to break the oilfilm you can get a coating of the cylinderwalls(glazing). |
04-11-2017, 02:53 PM | #4 | |
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Join Date: May 2010
Location: CLAYTON DE
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Re: What is ring seat?
Quote:
'Back in the day' An old Ford is left at the local service station with the complaint of "it smokes too much". Test drive shows oily smoke under acceleration. An indication of ring blow by. The old guy drains the oil, replaces it with kerosene, then parks it out back, running and smoking. After near an hour the smoke dies down. The kero is drained and clean oil put in. Then test drive. All is well. The buildup of dirt, due in part to dried out steel-mesh oil filters , unpaved roads, less than optimal fuel, ign., etc. etc. the crud now lays in the drain bucket. The rings can maintain their up-down path, and seal, while the piston works to contain the forces and pressures of combustion. The need of break-in (running fast) is rewarded with a higher-rate oil splash lubrication and yes, maxx pressure, to ensure the rings sit properly in the lands, during direction change, as the rings are learning the ropes of honed cylinders. As mentioned by Bolts a mating surface is made. JSeery I gotta say, thanks for alllll you do. flatheadmurre, I see your post about glaze. Again, I'm obliged to look to dirt. The glaze is not the oil, its the oil plus heat, plus dirt=scum. Another interference against the fitted up-down path the rings need. Please don't get me started on dirty or lack of dirty oil. I began my day for, more than thirteen years full-time, pulling drain plugs out of hot, abused, and neglected daily drivers.
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Enjoy yer day. Tom Hate can't fix what it started. Last edited by A bones; 04-11-2017 at 03:25 PM. |
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04-11-2017, 03:32 PM | #5 |
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Re: What is ring seat?
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Last edited by rotorwrench; 04-11-2017 at 06:05 PM. |
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