Piston/Ring issue???

RJ Sledge · 02-05-2015, 11:02 PM

I mic'd the rings and spacers and they checked, but had no way to really check the ring groove width or flatness. I ran a .059 pin around the groove and felt no tight spots, but I am thinking the grooves might not be perfectly flat.

Thanks
RJ

Dave Noll · 02-05-2015, 11:19 PM

Just for my education, can I ask what your particular combo cost's ?

RJ Sledge · 02-05-2015, 11:46 PM

Way too much!!

RJ

Adger Smith · 02-06-2015, 12:15 AM

RJ,
I sure am glad you called today to discuss this problem. I still think they have a wave to the groves. I was just about to pull the trigger on a set of pistons for a Drag Pack customer. Since there are only 2 different companies that are approved I think I will choose the other. Not because of the problem, but because it wasn't taken care of. At this point I'm very glad I have procrastinated on ordering parts for this build. Like I said when we closed our call... Thanks, I think?? ;~)

RJ Sledge · 02-06-2015, 01:22 AM

Adger

Like I told you today, The piston people told me they found nothing..... the ring people said they would call me back today and I never heard from them. Sort of makes me nervous.

At this point I feel like the "Rat caught in the trap, really don't care about the cheese anymore,.....just want out of the trap!!

So I don't care who or what is wrong, I just want it be fixed so I can put this thing together.

Later Bud

RJ

George Mirza · 02-06-2015, 11:51 PM

It's possible there is a small radius at the bottom corner of the ring groove. If the rings have a sharp square edge, when the seat in the bottom of the groove this could cause this rotation problem. This could be as small as .001-.002 radius and not visible to the eye. Is there a chamfer on the inside edge of the rings and spacers?
Interesting, keep us posted.
George

Jeff Stout · 02-07-2015, 12:08 PM

RJ Could you make a straight edge the same thickness of ring groove or a ,001 less and walk it around groove to find a sticking spot. I did this on a nitrous piston that had a problem of stuck ring. Couldn't see it by eye but found it with straight edge in groove when rotating it around piston. Ring groove was wavy as suggested by someone else

02-05-2015, 11:02 PM	#1
RJ Sledge Senior Member Join Date: Jun 2007 Posts: 790 Likes: 504 Liked 292 Times in 92 Posts	Re: Piston/Ring issue??? I mic'd the rings and spacers and they checked, but had no way to really check the ring groove width or flatness. I ran a .059 pin around the groove and felt no tight spots, but I am thinking the grooves might not be perfectly flat. Thanks RJ

02-05-2015, 11:19 PM	#2
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,708 Liked 240 Times in 112 Posts	Re: Piston/Ring issue??? Just for my education, can I ask what your particular combo cost's ? __________________ Dave Noll, EF/S ,?/SA 6526

02-05-2015, 11:46 PM	#3
RJ Sledge Senior Member Join Date: Jun 2007 Posts: 790 Likes: 504 Liked 292 Times in 92 Posts	Re: Piston/Ring issue??? Way too much!! RJ

02-06-2015, 12:15 AM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Piston/Ring issue??? RJ, I sure am glad you called today to discuss this problem. I still think they have a wave to the groves. I was just about to pull the trigger on a set of pistons for a Drag Pack customer. Since there are only 2 different companies that are approved I think I will choose the other. Not because of the problem, but because it wasn't taken care of. At this point I'm very glad I have procrastinated on ordering parts for this build. Like I said when we closed our call... Thanks, I think?? ;~) __________________ Adger Smith (Former SS) Last edited by Adger Smith; 02-06-2015 at 12:17 AM. Reason: sp

02-06-2015, 01:22 AM	#5
RJ Sledge Senior Member Join Date: Jun 2007 Posts: 790 Likes: 504 Liked 292 Times in 92 Posts	Re: Piston/Ring issue??? Adger Like I told you today, The piston people told me they found nothing..... the ring people said they would call me back today and I never heard from them. Sort of makes me nervous. At this point I feel like the "Rat caught in the trap, really don't care about the cheese anymore,.....just want out of the trap!! So I don't care who or what is wrong, I just want it be fixed so I can put this thing together. Later Bud RJ

02-06-2015, 11:51 PM	#6
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: Piston/Ring issue??? It's possible there is a small radius at the bottom corner of the ring groove. If the rings have a sharp square edge, when the seat in the bottom of the groove this could cause this rotation problem. This could be as small as .001-.002 radius and not visible to the eye. Is there a chamfer on the inside edge of the rings and spacers? Interesting, keep us posted. George

02-07-2015, 12:08 PM	#7
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,489 Likes: 66 Liked 706 Times in 283 Posts	Re: Piston/Ring issue??? RJ Could you make a straight edge the same thickness of ring groove or a ,001 less and walk it around groove to find a sticking spot. I did this on a nitrous piston that had a problem of stuck ring. Couldn't see it by eye but found it with straight edge in groove when rotating it around piston. Ring groove was wavy as suggested by someone else

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