do I need to replace these sleeves with anything? I am just going to remove mine for now. I have I few other ideas on the physics of a rotary I am going to experiment with. I just wondered if you guys replace yours with those pinapple racing ones or if you really need them?

 

Some remove them, some use Pineapple sleeves. Pineapple sleeves would be the best option, but I just wired mine open. I will remove them when I get around to porting the intake.