Originally Posted by
Flyfast1
I have a First Place Engines (FPE) 3.4 (55cc) engine on a Spitfire. The recommendation of the engine manufacturer was to orient the angled cut forward so that air is forced into the carb and that has worked great for several hundred flights. The engine runs great at all throttle settings.
-Ed B.
This is contrary to most experimental results done by many. Is your engine and port inside a cowl? If so that may explain it as the airflow beneath a cowl can certainly change how things work. If out in the breeze have you tried other positions, you may get an improvement if you do.