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Want to add a second O2 sensor to my
exhaust pipe, so I started to read up on best location. Came
across a Holley youtube video where he mentions that even a
pinhole could give a false reading. I did a smoke test on the
exhaust manifold (soldering iron in jar with baby oil, hoses
to/from in lid) and found that I have two tiny pin holes in my
weld. Wonder if that really would make any difference, but a 0.040
crack between engine block and flange (even with the SS gasket)
might lead to a lean reading. There are signs of slight blow-by
there. So I think I'll go through the trouble to mill all flanges
flat.
Finn
When
I welded on my stock Renesis exhaust manifold the end I welded the
270 deg bend on got warped.
It's about 0.04" bent away from completely flat at the top flange
at flywheel end.
Doesn't seem to have been an issue during the 100+ hours the
engine has run.
But for peace of mind I'm wondering if I should mill the three
flanges flat.
Is it true that I'll need a carbide end mill to do this? Even a
1/2" carbide end mill is close to $30.
Finn
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