5.38 Gears

Maybe. IIRC Redline sells a kit for the 134 with one of the progressive Webers. Even if the secondary is too large, it likely is vacumm operated so it will only open as far as the vacuum will allow. What's the venturi size of the Weber, and was it a kit specifically for the 134?

You can make a WAG about what size the carb should be. I calculate 155 cfm at 4000 rpm. It probably won't draw quite that much since the intake tract is restrictive so the volumetric efficiency will be low. I'd think that anything from 100-150 cfm would be fine.

 

Update!

The transfer case is working properly, and the jeep shifts fine between Hi and Low in four wheel drive. I have concluded that the transmission will need to be rebuilt, since it grinds loudly shifting from first to second, unless I shift real slow, and third gear makes a loud vibration noise.

I next moved my inspection to the carb. The Weber is a 32/36 DGV two barrel carburetor specifically made for 4 cylinder (134 ci) w/ L or F Head engines, replacing the Carter YF 1 Barrel. Weber states an estimated 18 % increase in HP with this unit. With that being said, I went out and looked at it this afternoon. When the gas pedal is all the way to the floor, one of the butterfly’s is all the way open, and the other is only partially open. If I rev the engine from the linkage on the engine itself, I can have them both open. I will attempt to adjust the linkage tomorrow morning. I think this might help.

My next thought is the exhaust. The Jeep has the original exhaust system, which is 40 plus years old. Could exhaust buildup on the inside decrease power? :? Would it be wise to replace the exhaust?

I plan on checking the timing in the morning to make sure it is set correctly. I will provide an update tomorrow.

 

I'd like to know what it's doing as well
hard to solve the problem this way

 

Let me clear up some confusion.

I mentioned the exhaust as a possible problem for the lack of top end speed, which is the main issue. I reasoned that if I have a newly rebuilt engine, newly installed clutch (put in when engine was rebuilt), a performance carb, and I am NOT stuck in low gear, the problem might be a combination of things. I thought that if the exhaust was clogged, it might limit the exhaust leaving the engine, thus makeing the engine work harder, and reach red line quicker.

I do not mean to confuse you; however I am at a total loss, and am willing to consider anything. The bottom line is that I can not go faster then 35-40 mph, and the engine “sounds” like it is red lining; however I do not have a tach installed, so I can not be sure.

I appreciate everyone’s help thus far.

 

Help us by clarifying your definition of "red line." Does the engine seem to be turning excessive RPM or does it just fall on its face and run out of power? (i.e.-you have your foot glued to the floor, but the Jeep only goes 32 1/2 MPH on flat road and goes much slower when you get to a hill). This will make a huge difference in our assessment of your problem.

 

If the brakes were dragging wouldn't he be trailing a bunch of smoke (drums)?
If you have ever been the victim of 'Potato Stuffing' you would know how the vehicle feels when the exhaust is restricted. New muffler would be in order, at least.

 

X2 on the brake thing , my sisters 75 had a draging brake.

 

I like this thread! Everyone of us thinks it is a simple problem, and that we would solve it if we were there. But things aren't always that simple! Is there a prize for guessing the right solution?

 

I always assumed it was red lining. But as this thread has progressed, I think the problem might be a lack of power, since as you said, the pedal is to the floor and I can only muster 35-40 mph, and yes it is slower on a hill. I originally thought that power was not the issue since it has been this way since I have had it, even after all the upgrades including rebuilding the engine. My 43’ MB’s transmission is much smoother, and the jeep runs in the upper 50’s. Therefore I started this thread to inquire about changing the gears.

After hearing feedback from everyone with similar setups, it was clear that I should be able to get a faster top end speed with my current setup. That leads me to the power issue. Again I do not have a tach installed, so I just assumed it was redlining (similar to how you can tell if a four wheeler is redlining), but I do not know for sure. I have also eliminated the possibility of being stuck in low gear.

I want to thank everyone for all of their patience so far. I went into to this not having a clue what the problem is, and now I still don’t know, but at least I have ruled out the gearing issue. I am open for any other suggestions. I plan on replacing the exhaust this week.

 

Is it possible the exhaust pipe is smashed flat someplace? That would cause you a lot of grief. You can get a whole new exhaust system for around $120 or so, Pete DeBella has them for $110 or $115, I think it was.

 

Maybe you could put the outlet of your vacuum cleaner up to the disconnected pipe and see if air flows easily out the tailpipe. Haven't tried it, but it should work.

 

I just had a new exhaust put on today, and wow what a difference it made. The old exhaust had lots of build up and was full of pinches and dents. I also adjusted the linkage to the carb so that it opens up all the way now. Man does it howl! It is nice when minor fixes or adjustments can make such an improvment. With the money I saved by not having to worry with regearing the Jeep, I think I am going to buy an overdrive from Herm.

 

you will enjoy the overdrive,you can shift it into overdrive while in any gear including reverse.glad your problem was solved.

 

And now your top speed is............?

 

Thanks!