I'm putting twin Dells into my camper. I've run them in my beetle with 'stacks and no filters but, now I'm running filters- do i need short stacks too?
Very simply you can a surge and blow back. Due to differential pressure differences, the air mixture always wants to go from a high pressure to a low pressure, When you close the throttle the pressure builds up in the carb throat, and you get a high pressure in the carb and a relative low pressure (atmospheric/static pressure)outside the carb, the mixture then wants to travel back up the carb to equalise.. True the stack helps this as it keeps the mixture contained but wont actually prevent it...Mr_Wobble said:Stacks can helep with another problem. When you lift off the throttle to change gear, the mist of air and fuel can (hard to explain properly) suddenly slow down, build up, and come out of the top of the carb. .