Morning all,
After some tech advice regarding a problem with oil loss. I've been reading up on a few issues and was after some clarification a few things.
A little background - I've recently finished my 2E 2.0 conversion on my mk2 digi 8v (2E block with a PB head). The block had done a reported 100k, although I have no proof of this, and turned over lovely and smooth with minimal bore wear. The head was on 140k and was fully refurbed with new valve guides and stem seals.
Engine pulls and drives very well however I'm burning a fair amount of oil in not a great deal of miles - most noticeable symptom is a plume of blue/grey smoke between gear change at high revs (over 5k). This is the only time I can see it smoking. Idle smells a bit fumey but no plume on start up etc. I ran a compression test to see what was going on and these were the figures after 3-4 strokes (seem ok to me?):
Engine cold:Cylinder 1: 190 psi / 13.1 bar
Cylinder 2: 190 psi / 13.1 bar
Cylinder 3: 200 psi / 14 bar
Cylinder 4: 200 psi / 14 bar
Engine up to temp:Cylinder 1: 190 psi / 13.1 bar
Cylinder 2: 190 psi / 13.1 bar
Cylinder 3: 195 psi / 13.5 bar
Cylinder 4: 200 psi / 14 bar
Barely any difference and seems healthy? Spark plugs look in reasonable health after 800-1000 miles. Plugs were bone dry and not oily, just a little black where it was running a little rich for a few miles before the timing was setup properly:
Cylinder 1:
Cylinder 2:
Cylinder 3:
Cylinder 4:
And this is the breather setup
If the rings were shot surely I'd be getting worse compression figures? Worn rings would smoke all of the time? It's been suggested that perhaps a stem seal has been fitted incorrectly. I guess what I'm trying to work out is whether it's a cylinder head issue or the block?
Any help appreciated, cheers!
