Inside case polishing

[Old standup rider]

So I did a little more research and asked a guy that builds engines. You can polish on direct injection but not port injection like a carbureted Ski.

 

[bored&stroked]

Yeah direct injection has no fuel in ports and doesn't flow anywhere except out the injector strait into the cylinder. They are going away from that already because it causes massive carbon build up and now they are doing direct injection combined with port injection for the cleaning effect on the valves mostly.

 

[Storbeck]

I went to auto machining school and have been building engines for friends for 20yrs. I used to do r&d for a performance company specializing in J series Honda v6's. My idea of easy to test is not something a guy can do in his garage, but from a manufacturer and high end performance company [or race shop more likely] stand point these are fairly simple things to do.
Laminar flow has everything to do with this, it deals with liquid, smooth surfaces, and their interactions.

I dunno, just kinda sounds like the steep part of the Dunning Kruger curve to me. Usually people who have actually done a lot of testing have been beat down by things not giving the expected results so they're a lot more reluctant to make absolute statements like that. For example, if you've been involved in testing of four stroke motors, you seem REALLY confident that whatever results you got transfer to a two stroke crankcase. Seems like quite a leap.

Were you even involved in the testing? What did you see in the camera? What were you looking for?

I'm not being sarcastic, I would genuinely be impressed. There is a big difference between "it should" or "that's what everyone says" and "I've actually tested it, multiple times". People who do a lot of testing are the most aware of this.

The laminar flow thing....seriously it really sounds like you're just saying laminar flow because that's a thing you heard that has something to do with air flow. Is there anything going on in a two stroke crankcase that involves laminar flow? I really doubt it, but explain I'm interested. School me, I'm often wrong and I love it when I am because it's a learning opportunity.