octane?

Old 03-13-2010, 04:02 PM
  #1  
mmphillips
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Default octane?

I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.
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Old 03-14-2010, 11:36 AM
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JEFF69Z28
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VP RACING FUEL TOLD ME 110 ON MY 11.30COMP. SBC
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Old 03-14-2010, 05:54 PM
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zipper06
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IU think hammertime posted this last yr sometime, since he is a VP dealer.

Zip.

Here is a rough recomendation. I have left out the lead count, the aromatic hydrocarbon content and specific gravity. There is also a difference in burning speed, energy value and cooling effect.
PM me if you want it all.

105 octane, CR under 12.5 to 1
108 octane, CR under 14.0 to 1 (75% of all racing engines)
114 octane, high CR and 8500+ rpm (comp cars)
116 octane, high CR and high RPM (ProStock, comp eliminator)
117 octane, Turbo and blown applications

Dave
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Old 03-15-2010, 02:55 AM
  #4  
cepx111
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Default Re: octane?

Originally Posted by mmphillips
I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.
I ran a 50/50 mixture of 110 and 93 pump gas in a 11.5-1 396 with no problems.

I believe straight 110 is a bit overkill for a 11.5-1 motor, that's what I run in my 13-1 496.

JMO<Cp
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Old 04-10-2010, 09:20 PM
  #5  
mark6052
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Vp red mixed 50/50 pump will work on 11-1comp. mix the 110 50/50 no less than 60/40 and you will be fine. keep total timing to 36* max.
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Old 04-11-2010, 04:18 AM
  #6  
ajk
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Default Re: octane?

Originally Posted by cepx111
Originally Posted by mmphillips
I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.
I ran a 50/50 mixture of 110 and 93 pump gas in a 11.5-1 396 with no problems.

I believe straight 110 is a bit overkill for a 11.5-1 motor, that's what I run in my 13-1 496.

JMO<Cp
Ran the same 50/50 mix in my 11.5 383. I beleive with aluminum heads you may be able to cheat that down a little more and save a few bucks on fuel...
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Old 04-11-2010, 08:02 AM
  #7  
ccperf721p
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I built a 11.5: 355 for my 70 Chevy 4X back in 1988, it was my daily driver for 8 years on nothing but 89 octane and 104 booster with 35* total timing. The same engine is still in the truck today, it's tired and only sees action once a month but on days I need to get two cars out to the track I can still drag the open trailer with it.
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Old 04-11-2010, 10:41 PM
  #8  
chevyfireball
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I ran 105 Octane Avgas in my 11.5:1 Camaro. 496ci with nitrous. No probs.
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