Holley Inlets, how big is big enough?
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Holley Inlets, how big is big enough?

  1. #1
    Half a bubble off jrork's Avatar
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    Default Holley Inlets, how big is big enough?

    The Dual 4's thread got me thinking and I didnt want to thread jack it so I'm posting it up here.

    Given the number of folks that are squeezin the hell out of their motors with multiple bottles or running massive amounts of boost and using big pumps to feed all of it, what is everyone running for inlet sizes?

    I've been running .150's which is likely overkill for my tub but curious what others are doing. When you look at Travis's turbo motor, that carb is running two inlets per bowl which is certainly needed for that monster but what about the rest of us?

    .097s, .110s, .120s or .150????

    Okay gents......flame away.....and thanks....john

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    LP-25.com Infomaniac's Avatar
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    Float needle seat size? 110 prolly good enough for a lake boat gasoline deal.

    The biggest issue to enough fuel I have seen is as SuperDave mentioned. Tank outlet too small or restrictive.

    Quote Originally Posted by jrork View Post
    The Dual 4's thread got me thinking and I didnt want to thread jack it so I'm posting it up here.

    Given the number of folks that are squeezin the hell out of their motors with multiple bottles or running massive amounts of boost and using big pumps to feed all of it, what is everyone running for inlet sizes?

    I've been running .150's which is likely overkill for my tub but curious what others are doing. When you look at Travis's turbo motor, that carb is running two inlets per bowl which is certainly needed for that monster but what about the rest of us?

    .097s, .110s, .120s or .150????

    Okay gents......flame away.....and thanks....john

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    LP-25.com Infomaniac's Avatar
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    Oh and some may never have thought about it but the bigger the
    float needle seat, the easier it is for pump pressure to force it open. If you are pushing the max for fuel pressure.

    force = area x pressure

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    Half a bubble off jrork's Avatar
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    Thanks very much Ron. In my setup anything would probably work but after seeing Travis's dual inlet bowl setups on that badass turbo deal and factoring in everyones use of big pumps to feed these carbs, it got me thinking about what's really needed.

    I admit my 150s are overkill but I thought the discussion was worthwhile here. Huge pumps, huge carbs but I've never seen any discussion on inlets.....

    Thanks again for not flaming me....................john

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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by jrork View Post
    Thanks very much Ron. In my setup anything would probably work but after seeing Travis's dual inlet bowl setups on that badass turbo deal and factoring in everyones use of big pumps to feed these carbs, it got me thinking about what's really needed.

    I admit my 150s are overkill but I thought the discussion was worthwhile here. Huge pumps, huge carbs but I've never seen any discussion on inlets.....

    Thanks again for not flaming me....................john
    As Ron stated the .110's will handle 90% of river racers. The 565 has .120's never had a problem. The needle and seat is something that is over-looked by people. I know a guy who burned up a blown 496 3 times before he figured out the .080 needle and seats was the problem

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    For some hard data for here, dug out my Holley manual (Copyright and chapter/page info available on request ).

    It rates flow for the seat assy's as follows (left off the smallest sizes and lowest fuel pressures, 'cause I didn't want to type it all).

    Flow numbers in Pounds fuel per hour.
    Seat Diameter and type ................ Flow @ 4psi ........ Flow @ 6psi
    .110" holes ...................................... 230 ................... 275
    .110" windows .................................. 232 ................... 295
    .120" windows .................................. 236 ................... 305


    To convert to GPM, divide by 390 (or divide by 6.5 (pounds) and divide by 60 (minuites per hour).

    My book aparently predates the .150" window seats, and I am having trouble finding chart data on Holley's site.

    BTW, 305 lb/hr = .78GPM, or 46GPH

    The viton-tipped needles are only up to .120" size, and are the only ones advised for gasoline, and for 90+% of uses. the Steel ones are for "exotic fuels" (per holley) that swell up the viton seal tips. The steel ones scar easilly from unclean fuel and tend not to seal well. They now make Titanium needles apparently, same as steel, race-use only advised.

    Keep in mind, that is for EACH SEAT, so a 4-barrell with 2 bowls, is double, 2x4v setup is multiple of 4 of course.
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    As Ron stated the .110's will handle 90% of river racers. The 565 has .120's never had a problem. The needle and seat is something that is over-looked by people. I know a guy who burned up a blown 496 3 times before he figured out the .080 needle and seats was the problem

    S CP
    0.082" seats:
    153 lb/hr @ 4psi ... 204 lb/hr @ 6psi
    Yea, not much to feed a big blown motor at high revs, probably had great fuel pressure, 300GPH or so pump?
    134gph flow for 2 carbs.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Quote Originally Posted by Sleeper CP View Post
    The needle and seat is something that is over-looked by people. I know a guy who burned up a blown 496 3 times before he figured out the .080 needle and seats was the problem

    S CP
    Ouch! That would suck and is zactly why I wanted to get this thread going. I see guys with -12 and -16 lines from their tanks to massive pumps and bigflow regulators and can't help but wonder about the needle&seat inlets.

    Quote Originally Posted by SmokinLowriderSS View Post
    For some hard data for here, dug out my Holley manual (Copyright and chapter/page info available on request ).

    It rates flow for the seat assy's as follows (left off the smallest sizes and lowest fuel pressures, 'cause I didn't want to type it all).

    Flow numbers in Pounds fuel per hour.
    Seat Diameter and type ................ Flow @ 4psi ........ Flow @ 6psi
    .110" holes ...................................... 230 ................... 275
    .110" windows .................................. 232 ................... 295
    .120" windows .................................. 236 ................... 305


    To convert to GPM, divide by 390 (or divide by 6.5 (pounds) and divide by 60 (minuites per hour).

    My book aparently predates the .150" window seats, and I am having trouble finding chart data on Holley's site.

    BTW, 305 lb/hr = .78GPM, or 46GPH

    The viton-tipped needles are only up to .120" size, and are the only ones advised for gasoline, and for 90+% of uses. the Steel ones are for "exotic fuels" (per holley) that swell up the viton seal tips. The steel ones scar easilly from unclean fuel and tend not to seal well. They now make Titanium needles apparently, same as steel, race-use only advised.

    Keep in mind, that is for EACH SEAT, so a 4-barrell with 2 bowls, is double, 2x4v setup is multiple of 4 of course.
    Thats the info I was looking for. Thanks a bunch. I haven't had any problems so far with the Titanium 150 but now you have me wondering and for sure I can see that a .110 or .120 would be all I need at the max.

    Thanks again guys......john

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    just a ski boat with bark Carnivalride's Avatar
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    I'm just running .110 viton tipped ones with windows but I have 4 with the dual 750s so they work just fine for me. Actually think I only had .120s in my big single 4bbl.

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    Quote Originally Posted by jrork View Post
    The Dual 4's thread got me thinking and I didnt want to thread jack it so I'm posting it up here.

    Given the number of folks that are squeezin the hell out of their motors with multiple bottles or running massive amounts of boost and using big pumps to feed all of it, what is everyone running for inlet sizes?

    I've been running .150's which is likely overkill for my tub but curious what others are doing. When you look at Travis's turbo motor, that carb is running two inlets per bowl which is certainly needed for that monster but what about the rest of us?

    .097s, .110s, .120s or .150????

    Okay gents......flame away.....and thanks....john

    .130 on my stock 429

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    Jim Guthrie set my carbs with .120's Johnny Show, you know how well they work . It was mentioned that having the n/s too large doesn't always mean better. The theory was it was best to have a 'balanced' system. To small means not enough fuel. To large means the n/s are bouncing open/close open/close. Getting the right size n/s means the fuel level stays more consistant in the bowls. That what I was told at least......................

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    Quote Originally Posted by cp598 View Post
    .130 on my stock 429 :d

    cough cough cough

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    reading this thread made me think about the needle and seats that are in my carbs.does anybody know what size does my 750 hp's part#0-80528-1 come with from holley?.i have a high flow pump and big lines in my fuel system.im thinking they are to small.

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    Quote Originally Posted by fast76rogers View Post
    reading this thread made me think about the needle and seats that are in my carbs.does anybody know what size does my 750 hp's part#0-80528-1 come with from holley?.i have a high flow pump and big lines in my fuel system.im thinking they are to small.
    Do you have any sustained high RPM operation problems (from the bowl fuel levels being pulled down)?

    If not, then they are not too small, period.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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