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Old Oct 21st, 2011, 8:21 pm   #1 (permalink)
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JE high-comp install 900SS

Question for those who have dropped in some JE high-comp pistons.

Just double checking my work/clearances, here is what I came up with.

Top ring - .014" gap
Second ring - .022 gap
oil control rings - .015"

The above is how they came.

Also...the valve reliefs appear to be the same size....but I'm double checking there isn't a "install towards front" type orientation.

I also noticed a small marking "N" on the top ring. I installed both of these up, although I'm not sure it matters.

Piston to wall clearance is .0022 - .0025" Nothing I can really do about that, but I'm hoping that will work.

Experiences/thoughts are appreciated!
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Old Oct 22nd, 2011, 3:28 am   #2 (permalink)
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You don't say whether they are 92 or 94mm, but I don't suppose that makes any difference to the answers

Quote:
Originally Posted by TAftonomos View Post
Question for those who have dropped in some JE high-comp pistons.

Just double checking my work/clearances, here is what I came up with.

Top ring - .014" gap
Second ring - .022 gap
oil control rings - .015"

The above is how they came.
I guess this depends on the bore?

Quote:
Originally Posted by TAftonomos View Post
Also...the valve reliefs appear to be the same size....but I'm double checking there isn't a "install towards front" type orientation.
They are different sizes. Larger to the INLET - beware of 'front' or 'rear' - think INLET / EXHAUST.

Quote:
Originally Posted by TAftonomos View Post
I also noticed a small marking "N" on the top ring. I installed both of these up, although I'm not sure it matters.
It DOES matter but I think N on top is correct, if no-one else jumps in I will check later.

Quote:
Originally Posted by TAftonomos View Post
Piston to wall clearance is .0022 - .0025" Nothing I can really do about that, but I'm hoping that will work.
The clearances, and where on the bore to measure them comes with the piston. You can have Nikasil stripped / replated / honed or cylinder bored and re plated. Google 'Langcourt'
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Old Oct 22nd, 2011, 4:55 am   #3 (permalink)
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Hi,

with the pistion should be an instruction sheet. Rings will normally have to be gapped. I have very seldomly not needed to adjust the gap on new rings. The "n" goes up.

The piston clearance should be checked with a bore gauge... You can also hone Nikasil with the proper flex hone.

If you don not have or have lost the instructions you should contact JP to get the exact specs.

Gray
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Old Oct 22nd, 2011, 8:29 am   #4 (permalink)
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Quote:
Originally Posted by Pict View Post
You don't say whether they are 92 or 94mm, but I don't suppose that makes any difference to the answers
92mm


Quote:
Originally Posted by Pict View Post
They are different sizes. Larger to the INLET - beware of 'front' or 'rear' - think INLET / EXHAUST.
Hmmm...the mic up the same


Quote:
Originally Posted by Pict View Post
It DOES matter but I think N on top is correct, if no-one else jumps in I will check later.


Quote:
Originally Posted by Pict View Post
The clearances, and where on the bore to measure them comes with the piston. You can have Nikasil stripped / replated / honed or cylinder bored and re plated. Google 'Langcourt'
They are "drop-in" pistons, and my piston to wall clearance is listed above.

No where on the spec sheet of the piston are the suggested ring gaps. There are measurements for the actual machine work on the piston, but nothing about ring gap. Piston to wall clearance is listed at .0020, mine are measuring .0002-.0003 larger, which I can't imagine would be a problem.

I'm looking for people who have installed these things to let me know where I'm at. I've obviously already checked the piston/wall clearance, know what a dial bore gauge is, etc.
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Old Oct 22nd, 2011, 9:21 am   #5 (permalink)
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If your in spec then you are good to go...
.0002-3 is just fine. Piston clearance is minium clearance. De-glaze the cylinder with a fine scotch brite pad.

I have installed many piston kits... Arias, JE, Weisco, Cosworth...

Gray
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Old Oct 22nd, 2011, 10:37 am   #6 (permalink)
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Hi,

Here is the work I did on mine.
1994 900SS engine work completed

Your clearances are good. Ring gaps are fine and the "N" goes up. The piston only goes in one way. The diameter of the valve pockets in the top of the piston are different! The smaller dia pocket goes to the exhaust valve pocket. I recommend ball honing the bores, it wont change the diameter much and will have a better surface. I took mine to Ducati Milwaukee and they brushed it while I waited. I had them do it, just so I wouldn't have to buy a hone that size.

I had the same questions with my JE piston kit, so I called JE and they said run it! I have several thousand miles on it now and I love it.

And for me being a Pilot and A&P, thanks for your help as a controller.

Cheerio and I hope this helps.

Bill
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Old Oct 22nd, 2011, 11:01 am   #7 (permalink)
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Quote:
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Hi,

Here is the work I did on mine.
1994 900SS engine work completed

Your clearances are good. Ring gaps are fine and the "N" goes up. The piston only goes in one way. The diameter of the valve pockets in the top of the piston are different! The smaller dia pocket goes to the exhaust valve pocket. I recommend ball honing the bores, it wont change the diameter much and will have a better surface. I took mine to Ducati Milwaukee and they brushed it while I waited. I had them do it, just so I wouldn't have to buy a hone that size.

I had the same questions with my JE piston kit, so I called JE and they said run it! I have several thousand miles on it now and I love it.

And for me being a Pilot and A&P, thanks for your help as a controller.

Cheerio and I hope this helps.

Bill
Thanks Bill. Nice work on those exhaust retainers and even more so on the dual plug heads!!!
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Old Oct 22nd, 2011, 11:25 am   #8 (permalink)
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I was told not to use a hone on the Nikasil bores, I used a scotch brite pad and that cleaned up the glaze nicely when I did the drop-ins.
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Old Oct 22nd, 2011, 11:30 am   #9 (permalink)
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Also...while I wait on Orings the dealer forgot to send me.


I installed the base gaskets DRY. Problem?
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Old Oct 22nd, 2011, 8:22 pm   #10 (permalink)
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Also...while I wait on Orings the dealer forgot to send me.


I installed the base gaskets DRY. Problem?
no problem there, dry is the way to do it.
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