[TR] engine compression results

[John Gillis]

Hi all,
On the continuing saga that is my TR2 engine rebuild, un-happy with  
the amount of blow-back coming out the oil filler cap, I removed all  
plugs, all 4 were very black, No. 1 was also wet, I am not too  
bothered by this as I have been playing around with mixtures while  
trying to get the engine set up and all engine running has been  
stationery. I carried out a compression test, this gave me 170psi on 1  
190psi on 2 and 3, but 4 would not hold compression, as soon as I  
stopped turning the engine over the gauge just sank to zero. I put  
some oil down the bore but it had no effect, mind you with such  
drastic readings or lack of them! I am not sure oil would deal with a  
ring problem. I was sure the engine was running on all 4, is this  
possible with zero compression. Any ideas on what I should do next at  
least to confirm where the problem lies.
Regards
John