right i have sat in my garage a b16a, b18c4 and b20 bottom ends. (plus another b20vtec sat in my car atm)

now just out of curiosity i went and removed the top and second rings and placed them in the bores of the corresponding engine just to see what the gaps were.

ie: new from the factory the manual says that on a b20 the ring gap is set 0.20-0.30 for the top ring and 0.40-0.55 for the second. but with the rings i removed the gaps are considerably larger (ie: top ring service limit is 0.60, which is what the ring gap measured)

does that sound right for a engine with around 80k on it? do the rings and bore really wear that much? also would gaps being that large effect oil consumption and compression?

just curious really for future reference.

 

For every .001 of ring or bore wear the gap will open .0031416. Think about it.