Predator carb......?
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Predator carb......?

  1. #1
    Senior Member sleekcraft137's Avatar
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    Default Predator carb......?

    anyone know much about these carbs?? I looked them up and they are a variable cfm 390-950 cfm. Anoyone try one? My dad has one off a motor he just bought, so i bolted it up to my motor. It seemed REALLY responsive!! apparently you dont need to worry about doing a rebuild due to the fact that there are no diaphragms.
    The Predator Carburetor
    Last edited by sleekcraft137; 04-16-2011 at 04:10 PM.
    And the new project begins!

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    yup they work...variable venturi

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    Senior Member HotRodJosh's Avatar
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    I've used them before...mostly back when I street raced....
    Guys either love them or hate them.
    Very crisp throttle response, but they don't like sharp corners. There are two different versions, one with an idle circuit and one without. Shouldn't need it for a jetboat.
    Getting the cover to not leak when adjusting the fuel cam can be a lesson in patience...haha.
    Did you get the cam plates??? New Predators come with a couple of different profiles.

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    Senior Member 42johnny's Avatar
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    ran them for years .. love em..
    yea tricky to get "just right" but once set.. hardly ever have to touch them...

    heres one on a small block
    "Blessed is the Nation whose God is the Lord."

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    Senior Member hellnback's Avatar
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    that the same thing as the old "Kendig" carbs ? had a neighbor I think was an engineer for them or something ... he had four of their old race cars ... Fairlanes I think.
    It may be OLD ,it may be Slow ... but at least it's MOBILE !!!

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    Senior Member sleekcraft137's Avatar
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    im going to give it a try, it will be interesting to see how it performs.
    And the new project begins!

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    other than adjusting the fuel curve cam, its a pretty good carb to try...keep an eye on the rubber flappers in the top of the carb...they will dry out if not paid attention to! ...re-build kits are available on EBay ...also...fuel cams from time to time!...just addin' my .02 cents

    FastRat

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    " Live Laterally " Dominator's Avatar
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    they are a pain in the ass but when you get them dialed they are good.
    " NO MOTOR NO BOATER "

    " I'd rather be riding in my boat thinking about God, than in church thinking about my boat ".


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    Resident Ford Nut Sleeper CP's Avatar
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    I have a few but have never tried them:




    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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    Same as Kendig VVC, except has an accelerator pump. Same basic fuel metering as on the old Corvette "spillvalve" Rochester fuel injection of the 50s and 60s. OK in boats, but have a small fuel bowl and a single inlet, you HAVE to make sure you have a good, hi-volume, steady fuel supply with a freeflowing line, and a regulator AT THE CARB! The mixture can change fairly radically with only a fuel pressure change due to the small bowl. The best way to tune them is with an O2 sensor deal at every 500 rpm under load to get the correct fuel cam. You can easily burn a hole in a piston at 3/4 throttle, and still have the correct full throttle mixture. With a half ass mild motor you can get away with these things, but if you have 500 HP or better, you either gotta be good, or real lucky. TIMINATOR
    Last edited by TIMINATOR; 04-17-2011 at 01:10 AM.
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

  13. #11
    Senior Member sleekcraft137's Avatar
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    Quote Originally Posted by TIMINATOR View Post
    Same as Kendig VVC, except has an accelerator pump. Same basic fuel metering as on the old Corvette "spillvalve" Rochester fuel injection of the 50s and 60s. OK in boats, but have a small fuel bowl and a single inlet, you HAVE to make sure you have a good, hi-volume, steady fuel supply with a freeflowing line, and a regulator AT THE CARB! The mixture can change fairly radically with only a fuel pressure change due to the small bowl. The best way to tune them is with an O2 sensor deal at every 500 rpm under load to get the correct fuel cam. You can easily burn a hole in a piston at 3/4 throttle, and still have the correct full throttle mixture. With a half ass mild motor you can get away with these things, but if you have 500 HP or better, you either gotta be good, or real lucky. TIMINATOR
    im running a Holley Blue fuel pump with regulator set to 6lbs.
    And the new project begins!

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    I have a pair of predators for sale. Previous owner had the pair on a blown 440 mopar. I rebuilt one and put it on my 455 as a single. It made that thing rev like a smallblock. The throttle response was unreal, I cant imagine EFI on that thing being much better. I only switched cause they arent coast guard approved, and Im going to closed engine here soon.

    Someone mentioned ebay for rebuild kits. Predator is still in business in NJ, and I got a rebuild kit from them cheaper than the ebay sellers. They also have spare fuel cams, fuel spray bars, etc. They have a bowl extension kit that they reccomended for a high HP boat application. Its the same extension that they sell to convert to alcohol. I just made a fuel slosh plate and never had a problem.
    BTW: the rebuild kit consists of some gaskets, check balls, accelerator pump diaphram, flappers, etc. they are pretty damn simple.

    The tuning on these things is dirt simple, and as stated above if you had an 02 sensor in the loop, you could custom cut a fuel cam to match your deal exactly, and would end up with whatever A/F ratio you wanted at each point in the RPM range. I searched the web for tuning tips and tricks, and also called predator a couple times, and compiled some of those things to help set it up and get it to perform. Predator was quite helpful on the phone.

    I would think this carb would be pretty cool to try in a blowthrough application. the bowl vent is already half done for you for boost reference, and no power valves to screw with. They would be easy to seal since there is only about 3 gaskets to start with.
    Last edited by slim pickens; 04-17-2011 at 04:40 PM.

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    Quote Originally Posted by Sleeper CP View Post
    I have a few but have never tried them:




    S CP
    lol, most peep's treadmills turn into expensive clothes hangers - Sleeper's turned into an expensive parts bench. Nice!

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    Quote Originally Posted by TIMINATOR View Post
    , and still have the correct full throttle mixture. With a half ass mild motor you can get away with these things, but if you have 500 HP or better, you either gotta be good, or real lucky. TIMINATOR

    So I wonder how much power they can support ?

    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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