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  •  » 1964 289 Tri-Power Setup - What do I do with it?

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    9/02/2019 6:15 AM  #26

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,520

    Re: 1964 289 Tri-Power Setup - What do I do with it?

    I don't think they drain down; I think gas evaporates out the bowl vent.  Mine is fine so long as its not more than a week of sitting, BUT EVERY carb I've ever had did the same thing.  The previous Autolite certainly did it too.

    Interesting you note the stutter on hard cornering.  I've noticed that too, but it always seems to be when the fuel tank is low.  My conclusion was just that the unbaffled tank meeting G-forces uncovered the pickup, causing the carb to suck air momentarily.  I'll have to see if the results are the same with a full tank.  I'm going to need to fuel up on my next trip as I'm now down to 1/4 tank after driving her a bunch the last couple days. 

     

    9/03/2019 5:05 PM  #27

    JeffK
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    From: San Jose, CA
    Registered: 4/01/2013
    Posts: 115

    Re: 1964 289 Tri-Power Setup - What do I do with it?

    Al Newman wrote:

    No real tuning issues on the Autolites other than accessing air/fuel screws on front and middle carbs. Finally solved that problem. Once in tune, no readjustments for several years. Middle carb is 1.02 and outboard carbs are 1.08. The Edelbrock carb is much more manageable than the Holleys. In my experience, they do tend to drain down after a few days of sitting, and they take a bit of cranking to refuel. They also tend to stutter on hard cornering under power. As for gas mileage, nobody I have ever known has installed tri power to improve mileage. It is an unintended consequence of the middle carb being so small (240cfm) and keeping your foot out of the other carbs (280cfm each). If I were to replace the setup, my choice also would be the small Edelbrock.

    Oh I think my carbs are a bit bigger than that, especially the center one. CFM is supposed to be about 850 or 950 total. How do you tell what size they are, mine don't have numbers on them.

    65 Vert (UCA mod,4bbl, hipo ex, 17x8), 2013 C-Max (hitch & cargo net), 2018 Cherokee (In bumper hitch)
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    9/07/2019 1:45 AM  #28

    Al Newman
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    Registered: 4/08/2013
    Posts: 222

    Re: 1964 289 Tri-Power Setup - What do I do with it?

    My take at the time was the Edelbrock's side to side bowls were the problem.  On a long, hard turn, the inboard bowl may lean out and intermittently draw air.  The bowls have a connecting fuel slot that may be allowing fuel to be pushed from inboard to outboard bowl.   Holley, with the center pivot float bowls fore and aft have no such problem.  The vintage race Mustang we ran back in the day had a baffled fuel cell and was mostly dry at the end of the sessions.
    Hard to get my mind around the fuel bowls drying up in a week.  Just pulled an Autolite 2V off my 3x2 setup, and it had not been run for two months.  Still had several tbsp fuel in the bowl.  Could be the residual fuel in the intake from prior operation was evaporated.

    Classic cars are full of surprises and almost none of them are good ones!
     

    9/07/2019 1:52 AM  #29

    Al Newman
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    Re: 1964 289 Tri-Power Setup - What do I do with it?

    JeffK wrote:

    Al Newman wrote:

    No real tuning issues on the Autolites other than accessing air/fuel screws on front and middle carbs. Finally solved that problem. Once in tune, no readjustments for several years. Middle carb is 1.02 and outboard carbs are 1.08. The Edelbrock carb is much more manageable than the Holleys. In my experience, they do tend to drain down after a few days of sitting, and they take a bit of cranking to refuel. They also tend to stutter on hard cornering under power. As for gas mileage, nobody I have ever known has installed tri power to improve mileage. It is an unintended consequence of the middle carb being so small (240cfm) and keeping your foot out of the other carbs (280cfm each). If I were to replace the setup, my choice also would be the small Edelbrock.

    Oh I think my carbs are a bit bigger than that, especially the center one. CFM is supposed to be about 850 or 950 total. How do you tell what size they are, mine don't have numbers on them.

     
    You have to reference the Holley four digit list number on the air horn to determine the cfm.  Autolites have a venturi size cast onto the carb body that can be translated into cfm.  Holley carb bodies look the same but may have several cfm ratings.

    Classic cars are full of surprises and almost none of them are good ones!
     

    9/08/2019 6:06 AM  #30

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,520

    Re: 1964 289 Tri-Power Setup - What do I do with it?

    That's interesting Al.  With a full tank I hammered through some turns recently, but didn't get much in the way of stutter.  Possibly they were simply not long enough, with enough sustained side load to cause the stutter.  Most of the turns I take are short and quick.  I'll keep monitoring it though.  Thanks for the insight. 

     

     

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