Don’t you need a little friction to get some compression?
Nope....................
Are you suggesting that we increase engine friction?
No
If it were possible you could get compression with zero friction.
All that is necessary for compression of gases is to reduce the volume of the container.
In an engine this is a mechanical process and so friction is unavoidable.
You want friction? Drain your oil, then go out for a drive.
You’re confusing friction with resistance.
You must overcome resistance in order to compress a spring, but the spring doesn’t have friction. (Unless it is being dragged along the ground...)
Friction doesn’t cause the compression - a tight seal and enough of a compression stroke do that - plus, the pistons aren’t the only area where friction can be reduced...materials and lubricants may allow for a very close-tolerance fit and lower friction at the same time.