09-05-2021, 10:47 AM
(This post was last modified: 09-05-2021, 10:48 AM by Bob Culver.)
Reading all this through again it is not over clear that rings with a slight external taper should be fitted so the largest external dia is down. The ring then planes over the oil film on the upstroke, scrapes on the downstroke..
A very slight shallow bevel can be filed on all ring top edges. Ideally stop before the gap.The lower edges of oil rings should have a relieved area below to scrape oil into. ie the dia should be less then skirt dia.
Seven pistons are prone to tilt due th very short bearing area. With patience relieved zones can be discontinued on the thrust faces to preserve bearing length. Any relief below the top oil ring should have drain holes.
Interested in the shims. If filed flush on outside as shown can be positioned with certainty. A legitimate way to correct over filed big ends.
A very slight shallow bevel can be filed on all ring top edges. Ideally stop before the gap.The lower edges of oil rings should have a relieved area below to scrape oil into. ie the dia should be less then skirt dia.
Seven pistons are prone to tilt due th very short bearing area. With patience relieved zones can be discontinued on the thrust faces to preserve bearing length. Any relief below the top oil ring should have drain holes.
Interested in the shims. If filed flush on outside as shown can be positioned with certainty. A legitimate way to correct over filed big ends.