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Outboard Technical Discussion This is our outboard engine related technical discussion forum. Topics include engine repair and maintenance, modifications, gearcases, electrical and electronics, etc. For technical assistance related to topics not outboard related please use our other Engine forum.

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Old 11-17-2017, 11:19 AM   #1
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I have a mercury 90 HP 4 stroke that i just installed new rings and honed the cylinders. I have about an hour run time on the motor. I building a mercury 115 4 stroke that uses the same piston rings. Can I hone the cylinders on the 115 and reuse the piston rings from the 90hp. I not going to use the 90Hp anymore.

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Old 11-17-2017, 02:10 PM   #2
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Can you use them? Sure. But should you use them? No.
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Old 11-17-2017, 07:32 PM   #3
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Do you think they are seated into the other cylinders already? I know it only a $160 for the new set of ring. But I'm trying to understand why they can't be used. Any insight to help understand, would be great.

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Old 11-17-2017, 08:41 PM   #4
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.. From the 'Book of Jim'..,The piston rings perform a critical function during all four phases of intake, compression, power, and exhaust. The rings keep oil and air from being drawn past the piston on the intake stroke. The rings keep all of the air/fuel in the cylinder during the compression stroke. during the power stroke the rings keep all of the expanding gases from blowing past the piston as the pressure pushes the piston down. On the exhaust stroke, the rings make sure that all of the spent gases are pushed out the exhaust port. Rings that do not seal well can leave 10, 20, 30, or more horsepower on the table depending on the size, compression ratio, and speed of the engine. Leaks during compression will cause loss of velocity and volumetric efficiency. Leaks on power stroke will let bad stuff into the crankcase to wreak havoc with the cleanliness of said oil (here comes loss of lubricative qualities of the oil and resultant engine damage). Rings that leak on the exhaust stroke will lower scaveging and allow some residual exhaust to dilute the incoming charge on the upcoming next intake event, again, lost power. How are we doing so far?
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Old 11-18-2017, 10:21 AM   #5
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Thanks Jim,

very helpful information.
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Old 11-18-2017, 10:30 AM   #6
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Helpful and informative, but did you notice how I ran intake and compression together there just to see if Sim would notice.
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