Well just because its not rich enough to burn doesn't mean there isn't fuel there at all and it has to go somewhere, it would get blown through and it would condense and pool. From what you've said I can't see what else might be wrong. Webbers and their manifolds are worse than the SU for port robbing yes, they are also bad for fuel condensation. That's why split Webbers were developed. They are also quite clunky carbs by comparison, quite fuel thirsty and unrefined. As I've said though I don't really get to have much to do with them, I expect in the hands of an expert they can be made to sing. Many people seem to love them, it's just I'm not one of them! Assuming you have just written the kPa results wrong here by a factor of 100 then yes, I'd say the compression is fine. Compression tests are a little pointless really in my opinion. They only ever tell you something you can already tell by other means or by elimination. But if you did a wet compression test you would probably find the small difference went away. But just in case, and for the sake of asking, have you gapped the plugs?
So, I ran the car around the block a couple of times and took out the plugs. Number 1 and 4 are lighter in colour with a slight mustard deposit on the ground electrode. The inner two cylinders are darker which I presume means the outer two cylinders are running lean while the inner ones are rich. Does this effect diminish as the revs increase of is it worse at higher revs compared to idle?
I re-measured my manifold... It is 4,5" not 5" as i was told. I reckon maybe I would be better with a longer one. What do you think? Will it improve the port robbing effect?
