Model B Carburator

[Gene F]

Originally Posted by Bob Bidonde

I suggest that you use a Model "A" Zenith carburetor with a 6:1 compression cylinder head if you want a stock appearance with more power & better gas mileage. Otherwise, use a Burns intake manifold with a downdraft Holley 94, a 6:1 cylinder head and a stock distributor. Time the engine at TDC with the spark lever down four notches.
The Holly 94 has an accelerator pump, rebuilding kits and a multitude of jet sizes are available. Ford used the 94 from 1937 into the 1950s.

Down 4 notches.... Bob, won't that beat the babbit out of the rods with a H-C head? Help me understand this.

With the 84, don't you need 12V to run a fuel pump, and regulator? (4's run at like 1 to 1.25 LBS fuel pressure.

[Y-Blockhead]

Originally Posted by Bob Bidonde

Time the engine at TDC with the spark lever down four notches.

Originally Posted by Gene F

Down 4 notches.... Bob, won't that beat the babbit out of the rods with a H-C head? Help me understand this.

With the 84, don't you need 12V to run a fuel pump, and regulator? (4's run at like 1 to 1.25 LBS fuel pressure.

The way I take what Bob suggested is time the engine at TDC with the lever down 4 notches. So 4 notches down on the quadrant is 0° advance.

Not sure what a "84" is but 6v fuel pumps are available.

[alexiskai]

Originally Posted by Y-Blockhead

The way I take what Bob suggested is time the engine at TDC with the lever down 4 notches. So 4 notches down on the quadrant is 0° advance.

Not sure what a "84" is but 6v fuel pumps are available.

He means the Holley 94, and yes, you don’t need to run 12V to run a fuel pump. In fact it’s often helpful, because you can take 12V pumps and run them at half speed, which gets you in the right ballpark pressure-wise.

[ursus]

Originally Posted by alexiskai

He means the Holley 94, and yes, you don’t need to run 12V to run a fuel pump. In fact it’s often helpful, because you can take 12V pumps and run them at half speed, which gets you in the right ballpark pressure-wise.

So, a 12V fuel pump run on a 6V system will run at half-speed? Would pressure at the carburetor be reduced by half as well?

[ModelA29]

Originally Posted by ursus

So, a 12V fuel pump run on a 6V system will run at half-speed? Would pressure at the carburetor be reduced by half as well?

Depends on the type pump. You have the old click/clack type pumps that basically energize/deenergize an electromagnet and that pulls a rod to operate a diaphragm pump like a normal mechanical fuel pump that bolts to the engine. The other is a vane pump where an electric motor pumps the fuel - sorta like a water pump. The vane pump may work on 6V but the old style probably won't.