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  1. #1
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    What octane to run with 19cc heads

    Just wondering what octane I should run with 19cc domes, engine is a 260 with stock deck heights, its has been ported to drag specs with geiger tec 19cc domes. Thanks for any input.
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

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    c16

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  4. #3
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    mix with klotz bēnol for best smell if not best reliability...

  5. #4
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    Nascar Fuel 112 or 114

  6. #5
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    Not trying hijack but got sum ? How much cranking comp is that and what kinds hp is expected from stock heads? Will hp go up 10 ,20 ,30?

  7. #6
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    This kinda loaded question. But not know your exact style of boating. 110vp or 112 sunco is plenty. Timing set a 25 degrees You want have a problem if your squish is right
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  8. #7
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    Quote Originally Posted by bigbluechevy454 View Post
    This kinda loaded question. But not know your exact style of boating. 110vp or 112 sunco is plenty. Timing set a 25 degrees You want have a problem if your squish is right
    This will be my drag motor, will be racing 800ft, 25° of timing, running VP c12 would be out of the question?
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

  9. #8
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    Always start ahead of the game and work backwards to what the motor wants. It is far less expensive that way.

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  11. #9
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    VP 112 is plenty of octane. Run your timing at 25 degrees
    Erik Kiser

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  13. #10
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    Quote Originally Posted by Brookbbb View Post
    This will be my drag motor, will be racing 800ft, 25° of timing, running VP c12 would be out of the question?
    . C12 is a great fuel. You will be plenty safe. If your just drag racing You can creep up on your timing possibly as well. But u need to pay attention to your tune
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  14. #11
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    If your drag racing I’d also make sure your fuel system can support that if you haven’t already addressed that
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

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  16. #12
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    Quote Originally Posted by bigbluechevy454 View Post
    If your drag racing I’d also make sure your fuel system can support that if you haven’t already addressed that
    I'm running a big Bush pump, 56lb reg, brucato box with an A6 tune, steamwheel up front and dual egts to monitor temps aswell, I wont be running these domes for lake use, 800 ft only.
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

  17. #13
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    Quote Originally Posted by patchesII View Post
    VP 112 is plenty of octane. Run your timing at 25 degrees
    I dont see a VP112 on the fuel list for VP, to confirm, I can run c12 or do I need c16? 108 vs 120 octane
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

  18. #14
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    Vp doesn’t make 112. C12 Is the number. The standard vp110 will also be safe. I’d suggest a little more pump than the Bosch for drag
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  19. #15
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    I’m apparently not up on VP’s race gas offerings. I thought they had a basic 112 like Sunoco has. Either way 110-112 octane is enough
    Erik Kiser

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