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Discussion Starter · #1 ·
Ok.. this is a beginner question. Looking to understand this measurement.

Ring Installed Gap
Top Ring – Standard 0.0059 +or- 0.138” (0.15 +or- 0.35mm)
Second Ring – Standard 0.0098 +or- 0.197” (0.25 +or- 0.50mm)

I'm not too dumb, but this looks like a top ring gap or .0059 +or- 0.138" Just looks odd to me.

I just need to know where to set the gap at for top and middle ring. Anyone have a good guidance? I thought it was .10" for top and .20" for middle.
 

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TURBO'S RULE
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Ok.. this is a beginner question. Looking to understand this measurement.

Ring Installed Gap
Top Ring – Standard 0.0059 +or- 0.138” (0.15 +or- 0.35mm)
Second Ring – Standard 0.0098 +or- 0.197” (0.25 +or- 0.50mm)

I'm not too dumb, but this looks like a top ring gap or .0059 +or- 0.138" Just looks odd to me.

I just need to know where to set the gap at for top and middle ring. Anyone have a good guidance? I thought it was .10" for top and .20" for middle.

Thats a little mixed up...
here are the right specs
top .0059 - .0138
sec .0098 - .0197
not plus or minus,
its minimum to maximum and you lost a zero in there somehow...
 

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Discussion Starter · #3 ·
Thanks.. I took those specs right out of the service manual. There is a plus/minus symbol in the spec. I just could not copy the exact to the forum for symbols. Yours makes a lot more sense. Assuming yours are in inches?
 

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I don't think engine will run for long with set up on minimum of 0.0059 and 0.0098 end gaps . Look to me more like plus/ minus 0.0059 from 0.0138 for top and 0.0098 plus/minus from 0.0197 for second should be right, but agree it is strange how they printed that in manual. IMHO
milos
 

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TURBO'S RULE
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I don't think engine will run for long with set up on minimum of 0.0059 and 0.0098 end gaps . Look to me more like plus/ minus 0.0059 from 0.0138 for top and 0.0098 plus/minus from 0.0197 for second should be right, but agree it is strange how they printed that in manual. IMHO
milos
Ahhh milosusa, that is almost the same thing.
.0138" minus .0059" equal .0078".... (within.002")pretty close to the .0059, but thats not what any manual says anyhow.


The above confusing above specs that phlorit posted from some 09 manuals was a misprint.
It is impossible to be at .0059" and have a +- of .138" ...that is more than 1/8" ring end gap in a small bore motor, or overlapped ring ends :rofl3:
The tolerance allowed spec is bigger than the initial recommended clearance... wrong!

Also if you look at the those incorrect specs, and compare it to the 2008,correct2009 and 2010 manuals, you can see the 0 was left out and a -_+ added. Some proof reader made a mistake. It was corrected in some 09, and all 2010 manuals.
Thats why I initially said,
"Thats a little mixed up"

Here is the thumbnail with the correct specs from a 2010 manual.
Only use these specs for a normally aspirated engine.
 

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Honestly I rather go with recommendation from high performance piston suppliers like JE . They recommend for street Bore X 0.0045 minimum for top Bore X 0.0050 minimum for second
for turbo Bore X 0.0050 top and Bore X 0.0055 for second minimum .
milos
 

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Discussion Starter · #9 ·
Thanks to all. I new it looked odd. Just putting in new rings and wanted to make sure they where gapped right. Also, was wondering what the old ones where and how much wear I had.

Just doing a stock rebuild with new stainless valves. 1 to 2 sand seasons then I will big bore the beast.

$70 for the rings... and $70 plus for the seals... what a rip off. I love factory Polaris parts. (and I dont get the major discounts you all may?!)
 
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