Finally Running?

Well after many trials and tribulations I finally got it to run. Newly rebuilt 225 V6, New HEI, basically new everything. Had carb sent to Vintage speed twice and they ran it to make sure everything was ok. We warmed up the engine, disconnected the vacuum line plugged carb vacuum port and set the engine timing to 6* BTDC. Idling at 750 RPM. Hooked up vacuum line from carb to HEI. Engine is still idling but puffing out black smoke. Ever since I got it to start it has been puffing out black smoke. Started with Roch. 2G idle mixture screws with 1.5 turns counterclockwise then screwed them in 1/2 turn so they are 1 turn out from being seated. Still black smoke. When I did the engine-break-in I had the RPM's @ 2000 for 20 minutes no black smoke. As soon as I returned it to Idle it started to load up and you could see the black smoke again. It also runs a little rough but that could be due to running so rich. The 2 things I thought it might be is the float is a little to high, it was supposed to have been set at 1/2". My next thought was maybe my fuel pump is pumping at too high of pressure. What do you guy's think? Would it help if I took a video and showed you how it is running? Thanks in advance.

 

Well you are a over a mile in elevation so may need to check the jets for proper size in that 2g.

 

What do your spark plugs look like? Do you have a vacuum gauge?

 

Check the fuel pump pressure with a combination vac/fuel pump gauge. HF has them inexpensive and its what I use. Its kind of a magic tool to help set timing, check fuel pressure and properly set mixture screws.

If its running that rich you might want to change the oil too.

 

I told Vintage speed that I live @ 6400' and go up in altitude from there so jet it for that. I do not have a vac/fuel pump gauge. I have not pulled a plug after this mornings start up but I will. What do most of you guy's set your 2G float at. I heard that some set it at 15/32. My mc2100 on another jeep was set a little low to keep it from flooding. I am going to have test the fuel pressure at a shop. I may have to put in a pressure regulator if it is too high.

 

What fuel pump are you running? I think there is a really simple test where you measure how much fuel comes out of your line into a container over a certain period of time and that will tell you if your pressure is close enough for a carburetor. I can't imagine the factory mechanical pump putting out too much pressure. And yes, a video/pics is always helpful!

 

Thanks Orangecj5. I will take a short video of it. The fuel pump is the mechanical style I do not think it is very new.

 

Another question is what size jets originally came in the 1971 cj5 with 225 V6 Rochester 2G? Mine may have the wrong jets for my altitude. Charlie Price the guy who rebuilt it says he usually puts the same number jets back in that were in it when he took it apart. He does not recall which ones were in it. What jets work for you over 7000'?

 

If your carb has the number stamped on the side this will help: Rochester 2 Jet Main Jet Specifications

If you take the top off your carb you can look down and see what size jets you have, there will be a number stamped on them.

This chart will hopefully get you to the correct starting point, you can adjust to your altitude from there!

 

My number stamped on the side of the carb= 17041185 070 1 1.

 

The Carb kit I have says all the jets for the Buick 225 should be .055 or stamped 55 on the jets. Do you have pics of your jets? Are you comfortable taking the top off?

Rochester 2G 2GV Carburetor Kit - Chevrolet, GMC & Jeep

If you put in that number, you get this kit.

 

No I have not taken the carb off the engine yet. I'm taking it in to a shop on Thursday and have a few things checked out. If they don't find a problem then I will bring it home and take the carb off.

 

Factory 2G jets for the V6 application are:
standard: .051"
over 5000 feet: .049"
over 10000 feet: .047"

 

jpflat2a Thank you very much for the info. Everyone has been great helping me till I get her purring like a kitten. I will let you know what I find out.

 

Here's a video. Just click on the facebook link and tell me what you see. Alittle black smoke and running a little rough. I have the timing set at 6 degrees BTDC and the idle @ 750 RPM. Idle screws 1 full turn out from being seated.

 

It says the vid is una

 

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