Ashford---My guess would be that you have a broken OIL ring on this
cylinder. A compression test wouldn't necessarily reveal this.
There is nothing I can think of that would cause a worn camshaft to
allow oil into this cylinder. However, you can measure lift at the cam
followers, (with a dummy pushrod and a dial indicator) and check them
against each other, if you want to do the work. It might be a good
excuse to get the cam you'd prefer. Like one to rival the M3?
A leakdown test is always a good thing to perform, when a mystery guest
appears.
If you're losing/having to add coolant, you can suspect it might be
finding its way into this cylinder. (Cool cylinder = wet plug, etc)
If this cylinder fouls its plug, sometimes running a hotter heat range,
(like the Champion 14NY..) can sometimes buy you extra drive time till
you correct the cause..
Dick
From:
70TR6@mindspring.com(R. Ashford Little II)
I'm trying to diagnose an issue I'm having with my TR6. I took the TR on
a fairly lengthy trip recently and was having problems with #2 fouling
out. I've always had issues with #2 and thought that a recent rebuild of
the cylinder head might rectify the situation. I was wrong.
So with this in mind I did a compression test last night and came up
with the following figures - dry. Btw, the head was shaved to achieve a
9:1 compression ratio.
#1 - 180
#2 - 180
#3 - 150
#4 - 155
#5 - 165
#6 - 180
Obviously #2 doesn't have a compression issue. Aside from the variance
in the cylinders, I suppose I'm looking at a bad ring or broken ring to
keep coming up with oily #2. Am I missing something else? I didn't check
the discumbobulator and the hyperspace module is in good working order.
Ideas?
R. Ashford Little II
'70 TR6, 73.5 911 <http://www.ralittle2.com/>
|