|
By increasing the vacuum in the crank case you can do the same. I would no want full vacuum but a 5psi difference to atmospheric pressure would do the same. A lot of single cylinder engines have reed valves that allow air from the crank case to escape and when the piston comes down but not return when the piston goes up. The cummins onan 140h has one, unfortunately it is a wear item like most feed valves. But a manifold ported vacuum would do the same
I was sure pumping losses were meant sucking the air through an intake and pushing through an exhaust. If you are concerned with the inside of an engine you should also knife edge the crank and smooth out anything else like the rods that move a lot
|