Piston Ring Gap Position
06-14-2012 | 01:03 PM
#1
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Three Wheelin'
Joined: Jan 2010
Posts: 1,382
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From: Muriland
Piston Ring Gap Position
I'm at the point where I can put my new Goetze rings on the pistons, but, I'm wondering about ring gap position. Using Goetze rings, with the two piece (spring & ring) oil scraper looks like it might require a different set up from the original three piece design. I did some research, but there was nothing specific to 928 / 944. I did however come across the diagrams below. The first two figures (figures 1 & 2) seem to make sense for the new Goetze rings I'm using, the other two figures (figures 3 & 4) seem to apply to the old style rings. Though, figure-4 suggests avoiding the initial placement of gaps at what are shown to be thrust surfaces and pin line...this seems to make good sense. FWIW, I've also read that rings don't stay put under use, and that they rotate somewhere in the range of 1 RPM under normal conditions.
So, my question is whether I should use the 120-degree setup for the new Goetze rings, and place the spring and oil ring gap at 180-degrees from each other, or if another setup I didn't come across would be more desirable.
Thanks! Dave
Figure-1
http://www.flickr.com/photos/51967142@N00/7186592383/
Figure-2
http://www.flickr.com/photos/51967142@N00/7186592423/
Figure-3
http://www.flickr.com/photos/51967142@N00/7371822704/
Figure-4
http://www.flickr.com/photos/51967142@N00/7371822750/
So, my question is whether I should use the 120-degree setup for the new Goetze rings, and place the spring and oil ring gap at 180-degrees from each other, or if another setup I didn't come across would be more desirable.
Thanks! Dave
Figure-1
http://www.flickr.com/photos/51967142@N00/7186592383/
Figure-2
http://www.flickr.com/photos/51967142@N00/7186592423/
Figure-3
http://www.flickr.com/photos/51967142@N00/7371822704/
Figure-4
http://www.flickr.com/photos/51967142@N00/7371822750/
