The Stovebolt Site Forums The Shop Area Engine Shop Was this be the problem with my Rochester Monojet?

I got my 261 running with its early Monojet carb after engine work. I've never had a problem with that carb. It started a little rougher than before but I could idle around around the neighborhood in my 2nd gear (3rd by total count.) It just wouldn't go 30-40 MPH after shifting into high. Give it more gas, it would kinda poop out.

So I decided to pull the Monojet and install my YF 2100s that I've had as a backup for years. I noticed, though, that the 2 Monojet nuts holding it to the manifold were only hand tight!

Yikes! Could that have been the problem with it in the first place?

I'm an experimentalist at heart so I'd like to put the Monojet back on and test the theory. But there is the YF. What do you think? March forward with the YF or put the Monojet back?

Heating expansion and cooling contraction of metal parts. A new gasket settles-in. It is a good practice to recheck tightness of parts near the exhaust manifold area.
A leaking intake manifold gasket can drastically reduce vacuum (flow) through your carburetor.
I would test again so I could sleep better at night and not worry about it.

This was a screw-up by the assembler, me.

I knew a guy with a Mopar something or other with a giant thermoquad on it. His complaint was that it ran poorly while cornering hard.
The bolts where so loose that you could lift one side of it to see into the manifold.
It did fine on the straightaways. It is a heavy carburetor, so gravity was working with him. Monojet, not so much.

I believe I'd try it to see. Can't hurt anything. As has been discussed here many times, the Carter is a much more carefully and thoughtfully engineered carburetor.

The monojet carb might be too small for a 261 unless it came off a 292.
George

If it's too small peak power will be down a bit.
No harm, no foul

A Carter YF for a 258 cubic AMC/Jeep inline six will probably be closer to the right calibration, although the Monojet for a 250 won't be too far off.
Jerry

Generally speaking, Jeep parts are expensive; however (and I have not looked), the YF for the Jeep might be an exception. Clifford makes a 4-barrel intake for the 258, and the Jeep folks bought lots of Carter 400 CFM AFB 4-barrels for their 258. We would modify the AFB, adding the off-road Carter fuel valve. Sold a lot of them, and then a gentleman in Europe cleaned my inventory of these.

Jon.

I just bought a "rebuildable core" YF for an AMC/Jeep/International 258 for $60.00. It looks good enough from an initial inspection to run without a rebuild, but I don't put much stock in outward appearances. Another bolter I know bought a Carter "factory rebuilt" AMC YF still in the remanufacturer's box for less than $100.00. It looks brand new and he says it really woke up his 261.
Jerry