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8N Piston Rings,Plain or Chrome?

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Bill

03-09-2002 18:59:17

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Does anyone have any input about which type of rings give best results?I wouldn't have given this a second thought,but when I picked up my block from the machine shop I was strongly advised not to use chrome rings when rebuilding.I was told that they are too hard and do not seal properly for a very long time and in many cases will never seal at all.Of course my rebuild kit has chrome rings in it.Anyone have any practical experience with this that you could pass along?I would be very interested to hear some feedback on this before I proceed.Thanks.

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ZANE

03-10-2002 05:09:40

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Re: 8N Piston Rings,Plain or Chrome? in reply to Bill, 03-09-2002 18:59:17

I could tell you a dozen other things to do and not to do on a newly rebuilt engine. Most of them are just old wives tales and do not have much bearing on how a newly rebuilt engine is going to do or how long it is going to last. If the engine was rebuilt right and the bore is straight and round the chrome rings will do just fine. I had in fact rather have the chrome rings. They will outlast most other rings. The enemy of any piston engine is foreign matter in the combustion chamber and on the cylinder walls. If it is clean there then the engine will have a long and usefull life. If it is dirty it will not. If it were not for the use of chrome in cylinders such things as weed eaters, chain saws and lots of other two cycle engines would not be possible. They have chrome plated cylinders of only about .002 thickness and will out last the pistons and rings etc if kept clean.

Some people think that when an engine that has had chrome rings wears out and begins to use excessive oil and the engine is gone into their will sometimes be found that the bore is badly worn but the rings are not. Thinking that the rings are the cause of this they blame the rings. Fact is that the rings just didn't wear like the cylinder walls did because the cylinder walls are only cast iron and they did the wearing and the chrome rings didn't. The wear is because of the dust etc that entered the engine and caused the wear. Even the carbon from the burned fuel that is mixed with the oil can excellerate the wear on the engine. That is why the oil is changed to get rid of the foriegn material that is not originally a part of the oil but it a product of combustion and outside dust that enters an engine through the crankcase breather in the older engines like the Ns have.

Give me chrome!!!!

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well said . . . Dell (WA)

03-10-2002 05:25:33

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Re: Re: 8N Piston Rings,Plain or Chrome? in reply to ZANE, 03-10-2002 05:09:40

I vote for chrome..... ...Dell

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