26-12-2021, 07:40 PM
(This post was last modified: 26-12-2021, 07:47 PM by Bob Culver.)
Thanks Colin
Tantalising comments. It had been observed that overcooled engines as in boats wore rapidly and that cars noted for overheating the opposite. Doctor's cars used for home calls when thay were so brave, were notorious for wear.
The trend has been to narrow rings, in part because less prone to scuffing. Warming an engine by idling was the fashion until it was realised that better to drive away at sensible loading and revs.
Cyls generally wear on the thrust side but as the ring pressure is the same all around seems curious. I suspect more due to fuel wash as valves usually on the other side (UK cars), and the squeezed out oil film. I have encountered exceptions.
My Seven had been rebored at 40,000 and 60,000 later in the mid 50s was .010 taper. Many short runs (and long ones). Into the 50s many smaller cars were rebored somtime in life. Then counter acid oils and anti wear additives became established.
Tantalising comments. It had been observed that overcooled engines as in boats wore rapidly and that cars noted for overheating the opposite. Doctor's cars used for home calls when thay were so brave, were notorious for wear.
The trend has been to narrow rings, in part because less prone to scuffing. Warming an engine by idling was the fashion until it was realised that better to drive away at sensible loading and revs.
Cyls generally wear on the thrust side but as the ring pressure is the same all around seems curious. I suspect more due to fuel wash as valves usually on the other side (UK cars), and the squeezed out oil film. I have encountered exceptions.
My Seven had been rebored at 40,000 and 60,000 later in the mid 50s was .010 taper. Many short runs (and long ones). Into the 50s many smaller cars were rebored somtime in life. Then counter acid oils and anti wear additives became established.