Holley 4412 carb

[FarmerBill]

I was doing some spring cleaning and came across this carb set up. It's a Holley 4412 on a crude looking dp manifold. It may or may not have been a home build, it has ugly looking welds but it is chromed. I got it a few years ago in a box of carbs I bought, I sold the rest on the Samba but nobody wanted this setup.
I'm assuming this carb is not great for VWs, I found a few topics in the forums, a couple of guys running them with turbos and a guy that said he really liked it with his w140 cam. Since this is a widely available carb and hardly anyone here is using them I would guess they don't work well or are hard to set up. Anybody out there ever run one? How did it work?

[modok]

It's possible somehow but out of the box the fuel curve would be all wrong.
Carbs designed for IR work on an isolate manifold far better than carbs designed to feed a plenum, and in fact the carburetor probably thinks it's feeding one 1000cc cylinder anyway. The two intake pulses can blend together.

It could work on a plenum manifold, but then it would be gnerally too large for most apps.

[NJ John]

Wanna sell it. Maybe, I’ll give it a try.
Linkage side seem backwards. Like the fuel bowl would be against the shroud.
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[BFB]

Yeh the fuel bowl probably would be against the shroud if the intake doesnt set the carb back? Although i you could run the carb with the bowl on the backside as the last one i worked on had linkage on both sides of the carb, not sure how / if the bowl being on the backside would affect fueling though?
I designed & 3D printed adapter(s) for one of these to go on both an IDF & 32/36 intakes and it had to set back a fair amount to clear the fan shroud.

Also, just put one on a draw through 1929cc engine, so far its only ran on the stand but i can say that making adjustments to this carb is a lot easier that a Weber ( and i like webers! ) and having a sight glass in the bowl and being able to externally set the float is awesome. However i dont think it has the tunability a Weber does, for instance you cant change the chokes
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[modok]

Agreed!
Possibly the setup was designed to go on the OTHER side of the shroud.
That's not going to work in a bug ect.....but rail buggies and trikes, circle track, formula-v.........they'd do that.

[FarmerBill]

Closer inspection today, the throttle shaft arm on the left side, if the bowl was facing away from the flywheel has been brazed so there's no good place for the throttle cable.

The manifold looks like it was modified to fit the Holley adapter plate, so likely homebuilt.

I also found these "velocity stacks" in the box so my money's on low budget racing.

From what I've read these carbs were popular in the dirt track/ circle track world, and were mandated by Nascar for certain tracks.

[jpaull]

Its really hard to spend hours making a odd carb combo work when you can get a set of new idfs for $200 and it will run better and have more power.
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[NJ John]

[BFB]