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Joined: Sun Oct 23, 2016 5:52 pm
Posts: 138
Location: Canada
... outside the box... again... I would imagine, lol... :roll:

I purchased a 3310(-4) from Rummit Sacing (attempt at non-mention, lol) about twenty years ago, and with about a week's run time, I decided it needed a different secondary spring. Long story, short, all three attaching screws snapped clean off in the body... was I pi$$ed. Loctite on those, the nasty kind? Seriously?...

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So pi$$ed in fact after unsuccessful attempts at screw extraction in my less patient youth, I put it out of sight until I figured some day the light bulb ever went off overhead as to try again or as to something to do with it instead of toss the body.

I got some frustration out here, lopping it's head off:

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... added a tiny hole in the center of the rear face... :omg:

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... and a vertical connecting hole and tapped 1/8-NPT up top, and brass fitting/body tapped 12-24 to down low, and epoxied...

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... and so, here are the beginnings of Thumper the 750 (1-3/8" & 1-7/16" venturi, 1-11/16" bores... 800?) Double-Franken-Pumper, LOL!:

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(No 10-32 set screws on hand yet...)

Secondary accelerator pump arm pivot stud hole drilled and tapped

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I've shortened the chimneys (lol) a bit and 45'd 'em. The secondary shooter's gonna be an anti-pullover since there won't be any needle and seat, just the passages and a longer than usual and hollowed and cross-drilled 12-24 screw (12-28 isn't in the run-of-the-mill tap and die set) to attach it. There's two cheap and appropriate to modify for this metering blocks for it on the way. No DP secondary throttle shaft stuff yet. Call me crazy, I couldn't toss it, so I'm doin' this, LOL! :O

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Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Tue Jan 24, 2017 4:59 pm
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Joined: Thu Mar 17, 2016 3:04 pm
Posts: 121
Talk about a looking for punishment LOL!

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Tue Jan 24, 2017 6:43 pm
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Joined: Mon Oct 21, 2013 12:15 am
Posts: 226
Location: San Diego, CA
I had a 3310 20+ years ago that I morphed into a double pumper. The rear boss was present, so decided to make it a double pumper! It worked great for years and years.........in fact, I still have that main body in a box.

The CFM works out to 780 on that main body.


Last edited by Revved Up on Tue Jan 24, 2017 9:50 pm, edited 1 time in total.



Tue Jan 24, 2017 9:10 pm
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Joined: Mon Oct 13, 2014 12:39 pm
Posts: 13
GNTKLLR,

Is that some kind of home brew secondary throttle adjuster I see? Any better pics of that?


Tue Jan 24, 2017 9:47 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1744
This is cool, I like it.

Be advised, the thread on the accelerator pump lever pivot pin is 14-20, not 1/4-20.


Wed Jan 25, 2017 4:15 pm
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Joined: Sun Oct 23, 2016 5:52 pm
Posts: 138
Location: Canada
KeyKeeper wrote:
Talk about a looking for punishment LOL!


:D

_________________
Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Thu Jan 26, 2017 11:25 am
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Joined: Sun Oct 23, 2016 5:52 pm
Posts: 138
Location: Canada
Revved Up wrote:
I had a 3310 20+ years ago that I morphed into a double pumper. The rear boss was present, so decided to make it a double pumper! It worked great for years and years.........in fact, I still have that main body in a box.

The CFM works out to 780 on that main body.


:thumbr: I mentioned 800 above because the bore/venturi sizes are the same as listed for the 4780 double pumper.

_________________
Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Thu Jan 26, 2017 11:28 am
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Joined: Mon Oct 21, 2013 12:15 am
Posts: 226
Location: San Diego, CA
When I first saw this post, my computer was not displaying the photos outlining the modifications. That is extremely impressive!! :thumbl:

Not sure if you can make it happen, but you can get the seats for the accelerator needle from BLP, AED, etc. When I did mine, I found someone (sorry that I cannot remember) in Missouri who had them for 60 cents.

Not a big deal, and I cannot tell if you can get it in there, but worth a shot if you are able.


Thu Jan 26, 2017 11:41 am
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Joined: Sun Oct 23, 2016 5:52 pm
Posts: 138
Location: Canada
Gary Anderson wrote:
GNTKLLR,

Is that some kind of home brew secondary throttle adjuster I see? Any better pics of that?


Yep, home brew. I'm repeatedly finding that I cannot budge the tiny secondary set screws on most old carburetors nowadays, and I also think that the adjusting from underneath once bolted on is an unnecessary aggravation anyways, lol. This one for vacuum secondaries:

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Before putting it on, put a bit of a twist on the adjusting screw end so it points at what used to be only the carburetor's secondary bracket WOT stop tab. I cut off what used to sit on top of the tiny original set screw.

* * * Disclaimer: Be careful that the new secondary idle screw and the choke's fast idle screw do not collide/contact each other when the primaries open... that could potentially stick the primary wide open, which is never a good thing.

Image


... and with probable casting variations, I wouldn't carve the following dimensions into stone, but they should be close:

Image

;)

_________________
Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Thu Jan 26, 2017 11:47 am
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Joined: Sun Oct 23, 2016 5:52 pm
Posts: 138
Location: Canada
tuner wrote:
This is cool, I like it.

Be advised, the thread on the accelerator pump lever pivot pin is 14-20, not 1/4-20.


Thanks, tuner, glad you do.

Hmmm... the two must be darn close, because 1/4-20 wound into the primary tap hole, and seems fine, not too loose or snug, with a stud wound into that new tapped hole. I looked all around for 14-20 info... must be a maximum-oddball size, I don't even see it listed on any charts I have or I've seen online... :ummm?:

_________________
Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Thu Jan 26, 2017 12:08 pm
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