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02-12-2014, 10:44 AM
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#1 |
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Senior Member
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Re: VP to Sunoco reference
Is there a leaded fuel with a lower octane (100 or less) out there that is NHRA Approved?
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Nelson Kowal Stock 345 |
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02-12-2014, 03:58 PM
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#2 |
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Re: VP to Sunoco reference
What you want to pay attention to is the SG and RVP of the different fuels. Similar specs on both will usually need similar jetting and perform close. If either deviate you will likely need to make changes. As far as lower octane than 100, what are you looking to lower octane for?
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02-13-2014, 09:25 AM
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#3 |
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Re: VP to Sunoco reference
I have a 9:25.1 Compression Ratio Motor. It would run much more efficiently on a lower octane fuel than 110.
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Nelson Kowal Stock 345 |
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02-13-2014, 12:18 PM
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#4 |
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Re: VP to Sunoco reference
The best way to get the specs for race fuel comparisons is from each manufacturers web site. The specs change fairly often. The above referenced chart is out of date I believe. You'll want to pay close attention to the Motor Octane, and the RVP number.
Most companies also have a crossover on their web sites to make it easier to switch between brands. And race gas for lower compression engines is available from a number of sources. Sunoco, Renegade, VP all make race gas for lower CR engines. |
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02-13-2014, 12:35 PM
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#5 |
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Re: VP to Sunoco reference
Mike,
Thanks, for the info ... What low CR gas is approved for NHRA /IHRA & what would you recommend for an 8 to 1 ???
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Dave Ribeiro 1033 STK Last edited by Dave Ribeiro; 02-13-2014 at 02:15 PM. |
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02-14-2014, 12:08 PM
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#6 |
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Re: VP to Sunoco reference
There haven't been very many race fuels submitted for NHRA approval by any of the manufacturers. Renegade makes several, but they aren't on the approved list as they weren't submitted..
For 8:1 you might want to stay with 93 octane street gas, Shell or Chevron. |
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02-14-2014, 03:57 PM
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#7 |
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Re: VP to Sunoco reference
For crossover of race fuels, here's some numbers.
Sunoco 110 Motor Octane 106 Specific gravity .729 VP 110 Motor Octane 107 Specific gravity .720 to .730 Renegade 110 Motor Octane 108 Specific gravity .718 Sunoco 112 Motor Octane 109 Specific gravity .715 VP C-12 Motor Octane 108 Specific gravity .717 Renegade 112 Motor Octane 109 Specific gravity .718 VP C-16 Motor Octane 117 Specific gravity .735 Renegade 120 Motor Octane 120 Specific gravity .710 |
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02-14-2014, 04:17 PM
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#8 |
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Re: VP to Sunoco reference
As for NHRA approved leaded fuels, C-11 comes in @ 104, & something called "sportsman" comes in @ 107. I copied this from their website for the 11 ...... Recommended for CRs up to 12:1 with restrictor plates and standard flow heads. Anticipate significant HP and torque increases. Used in NHRA Stock and Super Stock.
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Dave Noll, EF/S ,?/SA 6526 |
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