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 Post subject: Cranking compression
PostPosted: Thu Apr 12, 2007 6:47 pm 
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Turbo Slant 6
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Joined: Mon Nov 17, 2003 8:51 pm
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Location: Marion.Va
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About how much should a 170 with 9.3 to 1 compression ,Comp cams 264s installed straight up(degreed to specs) have as far as cranking compression? I have 145-150 across the board but this is with a relatively new engine that only has about 10 hours of running time and none of that is real world driving only a few short light to medium thottle 1/4 mile runs and the rest is tuning,idling,break in,and moving around the shop.
Are these numbers close to right?Thanks in advance.
HyperValiant

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1972 Valiant 4dr(Daughter Kelly's repair in progress)
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 Post subject:
PostPosted: Thu Apr 12, 2007 8:36 pm 
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Location: Park Forest, Illinoisy
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That doesn't sound too bad. :shock:

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 Post subject:
PostPosted: Thu Apr 12, 2007 8:42 pm 
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145-150 sounds very good with your setup, to me.

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 Post subject:
PostPosted: Fri Apr 13, 2007 8:52 am 
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Joined: Mon Oct 14, 2002 4:32 pm
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Location: Working in Silicon Valley, USA
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That's about right... as you noted, the compression may come-up a bit as the rings seat.
A little cam advance would also increase cranking compression.
DD


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 Post subject:
PostPosted: Sat Apr 14, 2007 6:09 am 
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Turbo Slant 6
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Joined: Mon Nov 17, 2003 8:51 pm
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Location: Marion.Va
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Thanks for the reply fellas.
HyperValiant

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1960 Hyper-Pac Valiant(rolling test-bed)
1963 Valiant V2OO(Son's summer project,- he just turned 15 :-) )
1972 Valiant 4dr(Daughter Kelly's repair in progress)
1974 Valiant (v8) daughter Kelly's work in progress


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