My apologies. I had the starting valve position backwards. It is open. Being open, it does allow faster warmup and quicker drying and expulsion of the condensate. As the manifold heats up, obviously the valve closes and redirects the heat and condensate out the tail pipe. With a valve that is stuck in the open position, the heat from the exhaust will create a too-hot condition in the fuel/air mixture causing inefficient fuel burn. The higher temps also allow the post-shutdown development of condensate in the manifold, which is why a poorly maintained motor will have an intake manifold that is black inside, and in the crankcase and that condensate will rise with the warm air from the crankcase into the PCV valve after shutdown and leave deposits which help in the accumulation of sludge in the PCV Valve, eventually blocking it and causing ever increasing crankcase pressure in the motor, overall poorer performance, oil blowing out of the fill tube, eventually, and causing seal failures and their concomitant leaks, and leads inevitably to a shorter life-span for the internal components of the motor. And stop and think for moment. Why does oil turn black? Because it accumulates carbon soot and dirt, which are particulate matter and moisture loves particulate matter. Cleaner oil for a longer period of time keeps a motor healthy. I require that the Heat Riser and PCV Valves be functioning correctly for all my carb work to be guaranteed.
