pump gas?
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pump gas?

  1. #1
    odfirefighter
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    Default pump gas?

    hey guys got a rebuild project about to go back together, its a 466 BBF 429 SCJ heads, srp forged flat tops stock crank and rods. lunati voodo 61602 cam, from what i have seen compression ratio is gonna be in the neiborhood of 11.7/1 will this run reliably on pump gas or am i gonna hafta run some race fuel?

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  3. #2
    Blown, OHBA Member Wild Hair's Avatar
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    If it were mine I would run AV gas or E 85. I dont think I would want to trust 91 or 93 oct. in my new motor at that compression. AV gas here is 4.00 + per gall. E85 2.70 per gall. and race fuel is 7.50+ If you haven't got the carb or carbs you might want to look into the E85 if its available in your area. About 25% more fuel required but an average gain of 5% in HP over AV gas. I converted mine this winter to E85, and looking foward to running it next summer. Also its 105 oct. out of the pump.
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  4. #3
    "BEER BUDGET RACING" Bodean's Hammer's Avatar
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    Pretty high C/R for pump gas. And don't trust octane boosters.

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  6. #4
    just a ski boat with bark Carnivalride's Avatar
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    odfirefighter,

    You had another thread on this and myself and a few others answered there, did you not like the answers?

    • If you really have 11.7:1 compression with iron heads and that small cam (262/268 adv) with a wide lobe seperation (112) you have way too much compression for pump gas.



    • Since you don't know the cc's of your combustion chambers or even what casting they are or how far below deck your pistons will be nobody can figure your compression to see if 11.7 is a good number or not.



    • Detonation will kill an engine faster than almost anything else so do you want to gamble over a few bucks for fuel?



    Loren
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  7. #5
    Senior Member MR.Magoo's Avatar
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    i dont like any of the answers you have given me loren!

  8. #6
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by MR.Magoo View Post
    i dont like any of the answers you have given me loren!
    oh well you get what you pay for.
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  9. #7
    odfirefighter
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    my bad i originaly posted this here and then thought i may have put it in the wrong area so i posted in the engine section. still new to this and i realy apreciate yalls input and your help. im gonna call the machine shop today and see if they can find the casting numbers for me and once i get the block back i will see where the pistons are sitting in the block. if i need to run race fuel i will. but if i can avoid it i would like to.

  10. #8
    "BEER BUDGET RACING" Bodean's Hammer's Avatar
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    Quote Originally Posted by odfirefighter View Post
    my bad i originaly posted this here and then thought i may have put it in the wrong area so i posted in the engine section. still new to this and i realy apreciate yalls input and your help. im gonna call the machine shop today and see if they can find the casting numbers for me and once i get the block back i will see where the pistons are sitting in the block. if i need to run race fuel i will. but if i can avoid it i would like to.

    theres always methanol, its cheap. and you will never over compression it. plus it smells like fast

  11. #9
    Senior Member MR.Magoo's Avatar
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    Quote Originally Posted by Carnivalride View Post
    oh well you get what you pay for.

    yeah i know i actually did start out with some small jets on the tunnel ram like you suggested

  12. #10
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by MR.Magoo View Post



    yeah i know i actually did start out with some small jets on the tunnel ram like you suggested
    So what jetting did you end up with?
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  13. #11
    Senior Member MR.Magoo's Avatar
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    well i started out with 68/70 i think now i have forgotten, i took the boat out on monday of this week, and it was popping from the start, pretty sure my timing is off, i am gonna pull the plugs tonight and see what they look like.

  14. #12
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by MR.Magoo View Post
    well i started out with 68/70 i think now i have forgotten, i took the boat out on monday of this week, and it was popping from the start, pretty sure my timing is off, i am gonna pull the plugs tonight and see what they look like.
    Are you using power valves or plugs? I'm running a 69 with a powervalve on the primary and 78s on the secondaries with plugs. So unless your running PVs on both sides that sounds way lean.
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  15. #13
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by MR.Magoo View Post
    well i started out with 68/70 i think now i have forgotten, i took the boat out on monday of this week, and it was popping from the start, pretty sure my timing is off, i am gonna pull the plugs tonight and see what they look like.
    did you end up with that frt timing cover along with the shovelnose? i know matt got it from billy , jus wasnt sure if you got it in the trade or not. i know the timing marks on it arent to be trusted, we made a new cut on the indicator when i tdc his 540, then of course his fluidbalancer had a timing tape made into it to read. you may have to do the ole pull a plug and tdc method to see where its at if you've got that timing cover randall.

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  16. #14
    Senior Member MR.Magoo's Avatar
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    no power valves loren, i think i am at 68/78 on the jets, and with these side mounted carbs should i square the jets? or what running 30 cc accel pump in front and 50 cc secondaries. and yes tom i am running the same timing cover it has 0 marked on it is this not right?

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