GTE block rebuild piston ring gap help.
#4
Lexus Test Driver
iTrader: (4)
I always use OEM specs on the 1st and 3rd ring.
On the 2nd ring, I like to go .002" tighter. This helps with the sealing under vacuum.
If you use Aftermarket Forged piston like JE or ROSS, they come with a spreadsheet on how much to gap your rings based on the power it will be making.
On the 2nd ring, I like to go .002" tighter. This helps with the sealing under vacuum.
If you use Aftermarket Forged piston like JE or ROSS, they come with a spreadsheet on how much to gap your rings based on the power it will be making.
#7
1: 1st 0.020 2nd 0.022
2: 1st 0.020 2nd 0.020
3: 1st 0.020 2nd 0.022
4: 1st 0.019 2nd 0.022
5: 1st 0.020 2nd 0.022
6: 1st 0.022 2nd 0.022-23
these are NPR rings from driftmotion, i havent filed them or anything. does those numbers look right?
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#9
Lexus Champion
iTrader: (12)
its a used block with with a fresh re-hone . machinist told me to use standard size rings. when i threw the rings :
1: 1st 0.020 2nd 0.022
2: 1st 0.020 2nd 0.020
3: 1st 0.020 2nd 0.022
4: 1st 0.019 2nd 0.022
5: 1st 0.020 2nd 0.022
6: 1st 0.022 2nd 0.022-23
these are NPR rings from driftmotion, i havent filed them or anything. does those numbers look right?
1: 1st 0.020 2nd 0.022
2: 1st 0.020 2nd 0.020
3: 1st 0.020 2nd 0.022
4: 1st 0.019 2nd 0.022
5: 1st 0.020 2nd 0.022
6: 1st 0.022 2nd 0.022-23
these are NPR rings from driftmotion, i havent filed them or anything. does those numbers look right?
Spec for top ring is: (0.0118 - 0.0157) Service Limit: (0.0394)
Second ring: (0.0138 - 0.0178) Service Limit: (0.0413)
Oil ring: (0.0051 - 0.0150) Service Limit: (0.0386)
I wonder what your piston to wall clearance is?
#11
Just as I thought. Since you have a seasoned block, you are outside of spec on them already. Even so, you are still within the service limits. Did you turn a piston upside-down and push the rings a couple inches down the bore and square them?
Spec for top ring is: (0.0118 - 0.0157) Service Limit: (0.0394)
Second ring: (0.0138 - 0.0178) Service Limit: (0.0413)
Oil ring: (0.0051 - 0.0150) Service Limit: (0.0386)
I wonder what your piston to wall clearance is?
Spec for top ring is: (0.0118 - 0.0157) Service Limit: (0.0394)
Second ring: (0.0138 - 0.0178) Service Limit: (0.0413)
Oil ring: (0.0051 - 0.0150) Service Limit: (0.0386)
I wonder what your piston to wall clearance is?
#15
Lexus Champion
iTrader: (12)
Which rings went to .016? Did your machine shop check for taper? Ideally, you have minimal taper in the bores. A .004-.006 change in gap within the stroke range of the bore seems like quite a bit to me. It is recommended to push the rings down halfway so the piston used to square them is fully into the bore, and "square" itself.