<VV> Mistery on oil fouled plugs

[Mark Durham]

Daniel, one more thing to look at. OK, several. All cylinder bores
should be bright and shiny with the cross hatch, no pits in the
cylinder walls, and no brown burned in areas, either. these may be
towards the top of the ring travel and probably not go all the way
around. Are the cylinders round? You will see this in variations of the
cross hatch and the coloration of the cylinder walls.
Did you happen to notice the position of the end gaps when you pulled
the cylinders off? And, how did you decide your end gaps were still
correct? Did you take the rings off the pistons and put them in the
cylinders? Mark Durham

Sent from my Windows Phone
From: Daniel Monasterio
Sent: 7/8/2012 13:29
To: VirtualVairs
Subject: <VV> Mistery on oil fouled plugs

Several weeks ago, posted about spark plugs fouled with oil, on 1,3
and 5 cylinders. Changed intake valve seals but, problem
persisted.Compression was 125 all around, engine is a 140 with 889
cam.After this, I suspected on broken 2nd rings or worn out oil rings
so, yesterday took out the power train and removed pistons 1 and 5. No
broken rings and all ring end gaps are perfectly within specs.Engine
has less than 15,000 miles. Pistons are cast ones with 0.060"
overbore, still looking like new. Cylinders still show tiny traces of
cris cross honing pattern.Only concern I got this morning is with the
upper cover baffle which was trimmed and bolted to the cover, years
ago, so, have no way to check if it's openings are on the correct
side. Don't have an untrimmedspare one to compare with.. Mine, as it
was installed, shows both upper and lower openings to the left side...
is it the right placing ?No oil signs on carb balance tube.BTW, never,
on 44 years dealing with Corvairs, have h
 ad oil fouled plugs, even on high mileage engines.
Have a set of NOS cylinder/piston set and think on installing them
after partially milling 0.070" on top of pistons but, not sure if
these pistons are good enough for this machining operation.What do you
think about ?
As always, thanks in advance for any ideas.
Daniel Monasterio


 		 	   		
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