cheers dan...when i get more pics, rest assured that they will be posted up too
Uber, i am sure we will get our busses running the way they should be ran, lol. However, i have been recording some worrying low compressions on no.2 cylinder - 105psi compared to the others around 155psi. 30% reduction. i was worried that it could either be a piston ring, valve, or cylinder to head interface.
i therefore carried out a leak down test on no.2 cylinder as well as no.1 cylinder as a reference. basically you pressurise the combustion chamber and measure how much leakage you get. the results are as follows:
no.1 Cylinder leak down results:
No. 2 Cylinder leak down results:
No.2 exhaust Valve:
there was a level of leakage that could be heard from the crankcase breather, which was coming past the piston rings. this is normal according to my porsche book. both cyclinders were consistent with eachother (the hissing that could be heard was the same volume and pitch). you could visibly see moisture (oil residue or condensation) bubbling past the closed valve.
i am inclined to believe that due to the engine standing around for 18months and not being run inder load that the condensation in the engine has been absorbed by the carbon and needs a good run out. i think i will just dress the engine, re-fit to vehicle and give it a good run up a hill!