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Old 01-26-2013, 07:58 PM   #25
cobrajet429
Focus Jr. Enthusiast
 
Join Date: Oct 2012
Fan#: 105085
Location: Davenport, FL
What I Drive: 2012 candy blue

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Quote:
Originally Posted by danno428cj View Post
Back pressue is not a factor in direct injection engines, as fuel charge scavenging can not happen, becasue the fuel charge is delivered at full compresion.
No but you still need to clear the combustion chamber of burned gases.
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