Evo 9 GSR & TTR Built 2.3L Oil Consumption
Mar 26, 2018, 04:41 PM
#166
EvoM Guru
iTrader: (1)
That seems like installer error on the oil rings.
Mar 26, 2018, 07:06 PM
#167
This happened on the last two builds, and the only difference is this time it only happened to 3 of the 4 cylinders. Only difference I saw in the teardown measurements it that the good cylinder had less cylinder tapper, The other 3 had a strange taper that opened up towards the top of the bore, which is what lead me to think there was some strange wear from the rings.
Mar 26, 2018, 07:44 PM
#168
EvoM Guru
iTrader: (1)
What are you revving this thing to?
Mar 27, 2018, 12:58 PM
#172
EvoM Guru
iTrader: (1)
Something is wrong with assembly. Either oil rail end gap, PTW clearance, or the oil rings were installed incorrectly. That damage doesn't just "happen".
Mar 27, 2018, 07:55 PM
#173
The only cylinder without ring land damage was less than 0.5 thou, the other 3 were 0.8-1.1 thou tapper. Again, hardly anything outrageous, but over the specs we would expect for an engine at work. Still not a worthy explanation for the consumption.
Mar 28, 2018, 12:56 PM
#175
EvoM Guru
iTrader: (1)
IIRC Wiseco calls for ">.010" end gap on the oil rings.
Mar 28, 2018, 01:42 PM
#176
Ok, well according to Mike at Wiseco, they actually recommend >15 thou. And again not the problem with either of these builds.
Only thing we have come up with is the Asymmetric skirts combined with a notched bore not providing good enough alignment. So the talk is focused on maybe a 87 1400 HD with some adjustments and a custom ring pack so hopefully can get this thing squared away soon.
Only thing we have come up with is the Asymmetric skirts combined with a notched bore not providing good enough alignment. So the talk is focused on maybe a 87 1400 HD with some adjustments and a custom ring pack so hopefully can get this thing squared away soon.
Apr 26, 2018, 02:02 AM
#177
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Have you checked that the oil support rail that is used on these pistons was fitted the right way? If it wasn't it could make the exact same damage as it did.
http://blog.wiseco.com/oil-support-rails-how-they-work
http://blog.wiseco.com/oil-support-rails-how-they-work
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