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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
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    Seebold F1 tunnel - 2.0 F1/champ

  2. #2
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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...
    Josh Peterson

    Quote Originally Posted by Danger Mouse View Post
    Well there you have it! The great OZ has spoken...

    leave a message and I'll return your call!

  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.

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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

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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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