alky tuning hilborn
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alky tuning hilborn

  1. #1
    Frank my lord Blown$um's Avatar
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    Default alky tuning hilborn

    i have a hilborn alky setup, my problem is that its running wayyyy to rich from idle to 1/4 throttle i adjust barrel valve to compensate but then i have a huge stumble and most time lean pop back though blower when trying to excellerate of idle. i have tried to lower my secondary bypass pressures to compensate the rich condition but its just returning more fuel to the tank and causing the same thing, not enough fuel pressure for the full throttle transition from idle and then again lean pops back on blower. when its running way to rich other cylinders light off others byway of the zoomies being next to each other, backwards threw the zoomies. anybody have any suggestions, what should i be tuning. where im i going wrong?
    "Ill be your huckleberry"

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    Senior Member kurtis500's Avatar
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    Whats your set-up? Where are the nozzles at and how many? Which Hilborn, 4 hole upright or forward facing? Which barrel is in the valve?

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    Ain't Right Racin piston in the wind's Avatar
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    Frank my lord Blown$um's Avatar
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    Default set up

    Quote Originally Posted by kurtis500 View Post
    Whats your set-up? Where are the nozzles at and how many? Which Hilborn, 4 hole upright or forward facing? Which barrel is in the valve?
    upright 4 hole 4" tall 3" butterfly's injector hat,4- #104 nozzles. 80a pump .050 main return pill, .024 secondary bypass spring . high speed cut off circuit with a #70 spring and .050 pill. alcohol barrel valve i believe.
    hope thats all the info you may need. thanks
    "Ill be your huckleberry"

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    Senior Member ol guy's Avatar
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    Back-off on you're idle bypass. remove shims behind the poppet.

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    Senior Member ol guy's Avatar
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    Rethinking here! I think kurtis500 asked the best question first--Whats the set-up? M

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    gn7
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    Quote Originally Posted by Blown$um View Post
    upright 4 hole 4" tall 3" butterfly's injector hat,4- #104 nozzles. 80a pump .050 main return pill, .024 secondary bypass spring . high speed cut off circuit with a #70 spring and .050 pill. alcohol barrel valve i believe.
    hope thats all the info you may need. thanks
    Sent fiat 48 a PM. He can make those things behave on the street if you like.



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    Frank my lord Blown$um's Avatar
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    Quote Originally Posted by gn7 View Post
    Sent fiat 48 a PM. He can make those things behave on the street if you like.

    hell yah!!!!
    "Ill be your huckleberry"

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    Quote Originally Posted by Blown$um View Post
    upright 4 hole 4" tall 3" butterfly's injector hat,4- #104 nozzles. 80a pump .050 main return pill, .024 secondary bypass spring . high speed cut off circuit with a #70 spring and .050 pill. alcohol barrel valve i believe.
    hope thats all the info you may need. thanks
    Well that is the right nozzle.
    I'd say you probably ought to have a main by pass pill of 70 to start....and forget the high speed....turn the can around backwards till you know where you are at in the fuel curve. The 80a pump is basically your high speed.

    What Lb spring is in the main jet can? (Where your 50 pill is now).
    That should be real weak...about 2 or 3 lbs.

    I'm thinking that part throttle bypass....that deal mainly for gas.....you might want to call Hilborn. They may have you not use that bypass. I wouldn't with alcohol.
    Last edited by Fiat48; 07-05-2011 at 09:31 PM.

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    i'm back!! 1QuickCP's Avatar
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    how much blower od ? what ignition ? compression and blower size?

    I would agree, chuck the high speed for now

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    Frank my lord Blown$um's Avatar
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    Quote Originally Posted by 1QuickCP View Post
    how much blower od ? what ignition ? compression and blower size? I would agree, chuck the high speed for now
    BBC 427 msd magnetic pickup dis. 7al2 msd box, 15% od, 12to1 comp.
    "Ill be your huckleberry"

  14. #12
    Frank my lord Blown$um's Avatar
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    Quote Originally Posted by Fiat48 View Post
    Well that is the right nozzle.
    I'd say you probably ought to have a main by pass pill of 70 to start....and forget the high speed....turn the can around backwards till you know where you are at in the fuel curve. The 80a pump is basically your high speed.

    What Lb spring is in the main jet can? (Where your 50 pill is now).
    That should be real weak...about 2 or 3 lbs.

    I'm thinking that part throttle bypass....that deal mainly for gas.....you might want to call Hilborn. They may have you not use that bypass. I wouldn't with alcohol.
    the lb spring is real weak like you said, only 2-3 lbs and that part throttle bypass seams to be the exact spring, i measured the pill it is .187 thick and the part throttle bypass from hilborn has an .187 thick open shim behind the spring, they seem to share the job at idle bypassing fuel. i called hilborn and they said the the pump could out flow the single cicuit in certain cases so thats why there is the secondary bypass. the barrel valve completely shuts the secondary bypass off when the throttle gets pass quarter throttle.
    "Ill be your huckleberry"

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    Quote Originally Posted by Blown$um View Post
    the lb spring is real weak like you said, only 2-3 lbs and that part throttle bypass seams to be the exact spring, i measured the pill it is .187 thick and the part throttle bypass from hilborn has an .187 thick open shim behind the spring, they seem to share the job at idle bypassing fuel. i called hilborn and they said the the pump could out flow the single cicuit in certain cases so thats why there is the secondary bypass. the barrel valve completely shuts the secondary bypass off when the throttle gets pass quarter throttle.
    Ok then first I have to ask if you are SURE you don't have the barrel valve spool in 180 out. Just take the inlet fuel line off and look into the BV and then open the throttle.....in which you should see the cutaway open up. It sounds dumb but it does happen.
    When you are idling....the main jet is flowing back to the tank. You adjust the BV for your idle and "transition" to open throttle. With a 50 pill in there you have plenty of fuel.....your high speed should not be flowing due to 70 lb spring....your part throttle by pass is probably flowing some (depending on spool cut).
    At part throttle (where the secondary bypass should be closed)...last thing you should have is a hesitation....because all you are flowing return wise is the main jet.
    So check that spool. That sounds suspect.
    You can also remove the shim stack in the secondary and put a pill in there (same thickness as you noted).....this will make the part throttle transition fatter...where you are getting that "bang" through the blower.
    I still say you can do without that secondary if you want to.....at least testing wise to fatten and get above that hesitation. Basically that is what Enderle does per say....flow the "secondary" through the main jet can...which is always going to have a pill in it....and a pill is a restriction of fuel back to the tank so the system is richer.

    One other thing to note is the pump....be sure the fuel shutoff opens all the way and is this a "known" good pump......which flows close to 7 gpm.
    One more thing is if you question you have a gas or alcohol spool....usually the only difference is the size of the hole (that the secondary bypass flows through) Alcohol spool has a bigger hole than gas. Maybe you can measure that and tell Hilborn.
    Last edited by Fiat48; 07-06-2011 at 07:54 PM.

  16. #14
    Frank my lord Blown$um's Avatar
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    i checked the spool its correct in its operations and installation, the pump is a known good pump which flowed 6.7gph. i can adjust the bv so it makes the transition well but in a few seconds of idling it starts running waaaay to fat again, and as it runs it just keeps slowly getting richer. even running it up a little bit to blow it out it, or clean its throat it starts running rich all the way up to about quarter throttle.
    "Ill be your huckleberry"

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