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Please help me understand some technical stuff

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Old 10-27-2007, 05:57 PM
  #21  
Ford_Dude
5th Gear Member
 
Join Date: Oct 2006
Location: Baytown, TX
Posts: 3,104
Default RE: Please help me understand some technical stuff

ORIGINAL: Nelsta21
ORIGINAL: Ford_Dude
First your right about C/R
C/R is the ratio of the differance in air volume at the bottom and top of the stroke
10.75:1 is a (now old knock sensors made higher commpression possable on 93) limit of 93 oct
if you were to put in 118 unleaded (if you can find it) you could up the commpression
So you are saying 10.75:1 is the limit of 93 octane gas but motors like the LS2 are running around 11:1? Not sure how that works on 91 octane, which is what is recomended? I think I just don't understand your meaning of "limit". Anyway I am glad some of you guys were able to chime in and give us the low down on C/R. It is amazing how much there is to know about a motor and how everything works together. I am looking to stroke and blow my motor so I will be needing to find that delicate balance here in the future. So thanks for the information guys, I am glad I didn't only get made fun of for asking a technical question.
The knock sensors retard the timing to allow it to work
before knock sensors 10.75 was the limit
in an ls2 if you put in say96+ oct (104 unleaded race gas) it will pick up some power due to the knock sensors (more so thanour 4.6)
10.75~11 is right on the edge
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