Luger Definitions~

[Olle]

Originally Posted by sheepherder

There actually is something like that. I don't know the name but it's used in auto engine intake manifolds, acts like Simichrome Polish, and is hydraulically pushed through the inlet & exhaust tracts. Looks like a big stream of toothpaste (which is also a polish) and is endless; the paste is picked up and pushed back through repeatedly. Gives a mirror surface to the passages.

It's called "extrude honing": http://extrudehoneafm.com/. It's a really neat method as it mimics the gas flow, so it tends to remove the restrictions and leave the rest alone. I was thinking about extrude honing a set of cast iron exhaust manifolds for my Chevelle and making them into sneaky "sleeper headers", but the cost was prohibitive.

For guns, there's something called "fire lapping", you shoot a bullet coated with abrasive. You can even buy bullets impregnated with abrasive for the purpose: http://www.midwayusa.com/product/847...ster-box-of-20 . These are made for lapping new barrels, but you could probably clean out a dark bore with them as well. The fire lapping idea sounds a bit like snake oil to me, but it might work.