05-05-2020, 09:45 AM
(This post was last modified: 05-05-2020, 09:51 AM by Bob Culver.)
There is another Believe it or Not.
In the parts book 1029A for the RP the grooves for 2nd ring are shown drilled through. This may be by the same artist who drew the diff pinion, but if ever actually drilled would render the ring non functional as a compression ring as rings depend on the gas pressure behind! In the 70s when there was obsession about economy some cars were made with one compression ring. I suspect my everyday "modern" had broken top rings for the last 100,000 miles so effectively only one ring It had less comp on thr handle than a worn Seven and fumed, but performance, economy and oil use fine.
In the parts book 1029A for the RP the grooves for 2nd ring are shown drilled through. This may be by the same artist who drew the diff pinion, but if ever actually drilled would render the ring non functional as a compression ring as rings depend on the gas pressure behind! In the 70s when there was obsession about economy some cars were made with one compression ring. I suspect my everyday "modern" had broken top rings for the last 100,000 miles so effectively only one ring It had less comp on thr handle than a worn Seven and fumed, but performance, economy and oil use fine.