Re: ihc-digest V5 #94 blow thru vs draw thru

[Steve Stegmann <stegmann@domain.elided>]

This just refers to the position of the blower, schematically speaking.  
Same info applies for turbo's, belt driven, or electric driven.

If the blower draws in air directly from the air cleaner and pressurizes a 
box containing the carb, then it is blow-thru.  The draw thru offers 
better throttle response as the blower pressurizes the carb box even when 
you have the throttle closed.

If the blower draws air thru the carb and then directly into the 
manifold, it is draw-thru.  

Draw thru is usually simpler and takes less space.   It also offers the 
advantage that the blower will mix the air/fuel before the engine gets 
it.  Sort of like running it thru a mix-master.

With port fuel injection you always get blow-thru.

Steve

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Steven A. Stegmann
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