A map sensor doesn't show flow turbulence though. turbulent air thru the carb is not optimal. I might need to make one.
There are horsepower dividends to be found here.
My builder uses those contoured plastic stub stacks on some of his hydroplane engines. Good for several HP (less than 10) on a 2.5 litre engine.
The theory is they straighten out the airflow into the carb.
If you race with no air filter, leaving the filter base on depending on how it's shaped is supposed to help for similar reasons.
Not knowing the correct engineering speak but it's either aero or fluid dynamics (Maybe both?) at work I believe.
Kevin
