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Re: Backfire




>
>JimA=> the exhaust is under positive pressure and will almost never 
>draw 
>=> air INTO itself.  

I disagree.  the exhaust is not always under positive pressure but under
a series of pressure pulses.  The are some basic air injection systems
for emissions that are nothing but a simple valve that allows fresh air
to enter the exhaust during the low pressure period between the pulses. 
(And to push this thread into  a different direction) This is also how
scavenging works on headers...  The pulse from one cylinder will help
draw the exhaust from another cylinder at the collector improving the
overall flow...

Scott (i could be wrong, but i may be right...)  

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