[Healeys] Healey 100 4 cyl (A90 actually but same) Engine Bore Q

[Larry Varley]

Hi Alan
Are you sure he has the dimension right on number 4? That is huge wear, 
more than the first oversize piston in fact! If it is right there must 
be a very big ring groove, ie big step at the top of the bore where the 
rings stopped at top dead centre? Was there? This step should be 
removed, or you run the risk of breaking the new top rings. I would 
recheck first as it doesn't sound right, measure the bore in a few 
different places, at various heights in the bore and at 90 degrees to 
each other to determine diameter and out of round. If it is right I 
think you are wasting your time and money just fitting a set of rings, 
in fact you would want to consider boring and sleeving the engine as the 
iron in number 4 must be as soft as butter.
Not exactly the Christmas present you were hoping for I guess.
Cheers
Larry Varley
Austin Healey 100 Restoration Site
http://www.acmefluid.com.au/larry/