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Old 01-30-2013, 07:36 PM   #29
cobrajet429
Focus Jr. Enthusiast
 
Join Date: Oct 2012
Fan#: 105085
Location: Davenport, FL
What I Drive: 2012 candy blue manual SE

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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.
You want too still cram as much air as possible with a scavenging affect. Air is still a factor in power making.
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