Jet Changes with Fuel Brands

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Dale H., Jul 10, 2017.

  1. Dale H.

    Dale H. Member

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    Has anyone noticed having to jet richer when switching from VP alcohol to Sunoco?
    -Dale
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    Dale, as Daryl as I know they should still require the same jetting if pure alcohol. If they didn't then then wouldn't pass a NHRA fuel test. Switching from VP M1 to VP M5 will require a jet change because of the added oxidizer.
     
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  3. Dale H.

    Dale H. Member

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    On two different cars I have tuned, looking back through my notes, almost the same amount of jet increase (around 25 numbers on the main) to achieve the same performance. It seems like I remember watching some NHRA Pro coverage, when pro stock changed gasoline brands that they had to run a different mixture.
    -Dale
     
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  4. Mike Canter

    Mike Canter Top Dragster

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    Gasoline is very different because of additives added. Methanol is meant to be 100% pure with no additives so should not be any difference from one brand to another.
     
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