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Piston Ring Gap [Merged 5-7] gapping rings pistons end filing

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The bottom compression ring should have a larger gap than the top ring to reduce top ring flutter or lifting. I just got done doing this today on my Wiseco pistons, they have a chart that came with the pistons that calculate what your ring end gap should be. Read this.

Your end gaps seem fine to me, maybe a tad loose, but you don't want it to tight where the ends butt up to each other when the engine is at operating temperature.
 
The bottom compression ring should have a larger gap than the top ring to reduce top ring flutter or lifting. I just got done doing this today on my Wiseco pistons, they have a chart that came with the pistons that calculate what your ring end gap should be. Read this.

Your end gaps seem fine to me, maybe a tad loose, but you don't want it to tight where the ends butt up to each other when the engine is at operating temperature.

what was the end gap you went with when you did yours?
 
i need some more input i really need to finish up this motor and im sorry to be a pain in the B@lls but like i said piston rings arent my thing so i did what wiseco says do bore times .0004 so i did 3.366 X .0045 = 0.015012 ( top ring ) and 3.366 X .0055 = 0.018513.

that just seems like the gaps are way to small but like i said rings arent my field please help me out guys:banghead:
 
I bought a brand new set of 20 over wisecos... took my block to the machine shop and was told that the block was already bored 20 over. So I was faced with a decision, and given the advice of a very reputable dsm engine builder in the area, I decided to bore the block SLIGHTLY more than 20 over just to make the cylinders round if this was possible. The machinist confirmed that the block was in good enough shape to bore slightly over and not go so big that the pistons would have too much clearance to the cyl walls... they said that the rings would have to be gapped a couple thousandths larger than asked for... but running the pistons loose would be ok and it's what the engine builder does in his personal cars and it works fine.

He told me that I need to use .004 and that's what he uses in his car... but I dunno what that refers to. does that mean I need to put my rings in the cylinder and make sure the ring gap is .004?... or.... is that piston to wall clearance? I'm kinda lost on this and would appreciate any advice someone could give me because I'm going to end up filing the rings myself.
 
ask your machinist

appreciate your enthusiasm in getting the correct answer, but this won't do. I can call the machinist but he's across town and is going to not remember... and want me to bring the block back to be measured again. This will not do.

I need to know what .004" refers to... is this the installed ring gap? Is this considered "loose"? "Ask my machinist" doesn't help.
 
Hey,

I have been reading about ring gap in this tread but it seemed that most people that were sharing they're ring gap measurments were using aftermarket pistons.

I am using 2G pistons with 1G big rods and would like to know if that could make any difference. (stock pistons don't expand as much as forged).

I was thinking of using .018 for the top and .022 for the bottom.

please look at my question it has more info on this thread:
Engine Rebuild, Need Help on Piston Ring Gap. - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com
 
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