Uneven compressions

christopher storey said:
Incidentally, all 4 cylinders appear to have been lined, and the man who does my engines says that he has seen quite a few Rover engines ( not necessarily P6) with liners from new - it appears that it may have been a way of using a block that may have had some casting deficiencies
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I wonder why? It truly doesn't seem to make economic sense.
Surely even a cursory inspection would have shown defects before machining started?
I'd have expected them to just skip it and machine the next one.

John
 
Well, I agree about the economics. The other possibility is that someone has linered the block subsequently, to take standard pistons , but the curious thing is that the engine looks undisturbed , and the crank is absolutely standard and in surprisingly good nick
 
Is that actually corrosion of the bore (lack of use) rather than good old fashioned wear and tear?

I'm frankly surprised you got as much compression as you did. Certainly the rings would take a fairly rapid beating in there.
 
Peter : yes, it looks to me as though the cylinder stood for a very long time with, probably, water in it . It was surprising that there was any compression, but it was 85 cold and 121 hot, the hot figure improved by 30 if oil was put down the bore . The rings, surprisingly , were not at all bad
 
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