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What octane fuel ? | 
 
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   YT  
   
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   Joined: 13 May 2010 Location: IL Points: 22  | 
  
   
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     Topic: What octane fuel ?Posted: 21 Apr 2016 at 8:39pm  | 
 
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   I know there are lots of variables, but what octane of fuel would one use if cranking pressure is around 200-210 psi?
    
   
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   DrAllis  
   
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   Joined: 12 Sep 2009 Points: 22149  | 
  
   
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     Posted: 21 Apr 2016 at 10:06pm | 
 
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   100 to 104 should be good enough. Your total ignition timing (at full throttle)should be around maybe 20 degrees?? and set on a dyno to verify that is the best timing setting. Stock timing of 25 to 30 degrees BTDC is too fast with that much compression.
    
   
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   YT  
   
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   Joined: 13 May 2010 Location: IL Points: 22  | 
  
   
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     Posted: 22 Apr 2016 at 6:56am | 
 
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   Thanks Doc. Hopefully be on the dyno this weekend.
    
   
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