I have a 2001 Ferrari F1 piston, and it has two rings, an oil control ring, and a compression ring.
When I used to build racing engines, we built a jig to hold a ring on a lathe, so we could machine the inner diameter to reduce ring tension. Then on the dry sump oil pump, we would add and...
It it my understanding that the short header=burnt exhaust valves theory is pointing toward that fact the exhaust system has a vacuum of sorts when you let off the throttle, hence the reason that engines with cracked or broken headers backfire under decel. When you decel, there is still fuel...
