Howdy.
I'm wondering, should be running velocity stacks on the 40 IDF's on
this 1835? I've been told yes and no? What are the pro's and cons?
Insight?
Give you a couple reasons I have read about, one of the sources is Berg, I
think.
First a physical law thing: with a funnel you can get more air in there
than without due to the sharp transition of the edge of the
carb mouth. That sharp edge is a pressure drop and probably cuts the
effective throat size by quite a bit. Turbulent flow versus Laminar.
The second reason is the one I attribute to Berg: he says that there
is a cloud of fuel vapor above the carb opening approximately the height of
the air cleaner (stock).
If you don't have a velocity stack or tube like contrivance that hi,
you will lose a lot of fuel. Serious mileage difference.
The various stock cleaners seem to bear this out but I really couldn't
prove it.
This is not to say a velocity stack over a decent air cleaner of the
proper height, tho if I were racing, I think I would go with the stack.
west