C1 2X4 Running Very Rich

[Dave H.]

[Art B.]

Re: C1 2X4 Running Very Rich

Dave:
Others in the organization may be able to give you several suggestions. On my 2x4 1957 I found that by letting just the rear carb operate at idle solved my overly rich problem. It was Gary Hodges who suggested this. By this I mean that the front carb idle speed screw was turned out. As to mileage, my '57 only gets about 13mpg no matter how I drive it. Your gear ratio and transmission will affect this.

[Clem Z.]

if it is a 270 HP rejet the carbs to 245 HP specs *NM*

[Clem Z.]

also block the heat riser crossover in the intake *NM*

[Rob Dame]

Re: also block the heat riser crossover in the int

Check fuel pump pressure. Is the choke opening? I adjusted the floats in my 225 hp a tad lower than factory specs. I have the specs recomended by several here that I adjusted them to at home. I can find and post them later if you'd like. I also blocked the heat crossover and put double gaskets under the carbs. The ole Heap has not missed a beat in over 6,000 miles on the same plugs and points, knock on wood. Rob

[Roy B.]

Re: C1 2X4 Running Very Rich

What I would do= the rear Carb should be the Carb for idle only, once you add RPM "driving" the idle screws do nothing "that's why they call them idle screws" Front Carb idle srews in or out dont matter " Carb not working till you use your lead foot", AGAIN check float level by taking the Carb side screws out to see if your spilling gas " if so the floats are to high" then pull the little front top covers off to be sure that the metering rods are pulled down when the engine is running " you can drive the vett with out those covers on so that changing different metering rods to tune in the right ones is easy and fast" Check that the metering rods are adjusted right going in to the jets, "if their not going in to them deep to reduce the fuel flow it will run rich at idle , or the metering rods are wrong "to thin" need fatter metering rods, check to be sure the choke plate is open when the engine is at operating temp. Check timing for the heat problem, 13 to 15 mpg is normal driving. Gary is the best but it don't hurt to check these things out!!
The metering rods In my opinion or 2 cents is your problem

[William C.]

Re: C1 2X4 Running Very Rich

If the float levels are ok as checked at the sight plugs while the engine is having problems, the issue of "radical" camshaft may be a big contributor to your problem, as the metering rods use manifold vacuum to hold them down and control main jet fuel flow at idle and light loads. If you check the metering rods and holder (under the cover on the top of the carb) when the engine is acting up, look to make sure the rods are being drawn all the way to the down position at idle. You can warm it up and drive short distances with the cover off, just don't overdoo it. If this is the problem, a softer spring or even a higher idle speed (within reason) way help.

[Roy B.]

Re: C1 2X4 Running Very Rich

I for got also I had a friend using those repro air cleaner and he tightened down the wing nut to much cutting off air flow ,"spark arrester retainer not made right" Try running with out it once!!!