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Unread 09-08-2014, 07:34 PM   #1
bobdillsworth
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cj7 258 Weber Tuning Issues

i recently purchases a weber 32/36 dgev from weber direct after i just rebuilt the motor. everything is brand new. I am wondering what jets i need to run in it to get it to run not so rich. it came with these jets:

Mains p/s 145/145
idle 75/60
air corrector 160/160

not sure on pump jet. also when i first start start the jeep in the morning is worms up really rough and chugs like it might be getting to much fuel? or maybe not enough? i am not sure. but once warm it runs great minus the smell of fuel.

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Unread 09-09-2014, 05:04 AM   #2
swatson454
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Try the first couple of pages in the Weber Set-up and Tune Discussion and see if that helps. Initial timing and manifold vacuum to the distributor will be key to getting a 32/36 to run decent on a 258.


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Unread 09-10-2014, 04:57 PM   #3
bobdillsworth
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what should the timing be set at roughly?

Bob
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Unread 09-10-2014, 05:03 PM   #4
swatson454
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10* to 12*, as long as it doesn't knock on you. Manifold vacuum will help a lot, too.


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Unread 09-11-2014, 04:26 PM   #5
bobdillsworth
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So instead of the advance port on the carb use manifold? I am trying to get it to run with 0 vacuum from the S port and cant keep it idling. Not sure what to try next? I checked to make sure the plates were covering half of the progression port like in the thread and it js about 1 1/2- 1 3/4 turns on idle screw. With a 75 idle jet 2 turns out it wont stay running or have 0 vacuum
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Unread 09-11-2014, 04:52 PM   #6
swatson454
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Yes, manifold vacuum. It's been said that you can pull up to an inch and a half of vacuum through the spark port on the carb and still be "good enough". That's a terribly small carb for a 258.


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Unread 09-11-2014, 05:00 PM   #7
bobdillsworth
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so then plug off the vacuum advance and just run manifold full time? i didn't realize it would be such a pain to get this tuned right. i bought the carb back in june and still can't get it right. Im not sure if this has anything to do with my issue but on a parts list i received from weber it goes over the "original Specs" for the jetting and what not and from what i see everyone on here post with jet sizes its pretty much the same besides the air corrector jets. i see others with 170p/160s and mine came with 160p/160s could that be an issue? my main jets are both 145
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Unread 09-11-2014, 05:30 PM   #8
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That's correct, Bob. Plug the port on the carb and run the hose over to the manifold vacuum port below the carb on the drivers' side and keep it there.

I've never seen anyone correctly tune that carb with anything smaller than a 170 primary with 175 being more normal. A 160 on the primary side is probably never going to work.


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Unread 09-11-2014, 05:50 PM   #9
bobdillsworth
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what should the emulsion tubes be? doesn't seem like the rights parts came for my setup, so just want to make sure i get all the right combinations for when i call tomorrow and have them send me the parts
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Unread 09-12-2014, 05:40 AM   #10
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I'm really not a fan of the F-50 tubes that come installed but, being that there's such a large demand on the primary side, it might be ok. Personally, I would install an F6 in the primary side and see how it responded to a fairly rapid throttle opening and whether or not the midrange torque improved.

As for the secondary side, I'd definitely install an F7. A wide-band air/fuel monitor would be a God send at this point.


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Unread 09-12-2014, 04:46 PM   #11
bobdillsworth
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Shawn, after hooked distributor to manufold vacuum and timing at 12* i still cant get it to idle at the 1 1/2 turns i. On idle screw
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Unread 09-12-2014, 04:47 PM   #12
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Is the progression hole by the throttle plate the first hole that is exposed?
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Unread 09-12-2014, 05:06 PM   #13
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Shoot. You might have to cheat up to 1.5 inches of vacuum at the spark port and see what happens. You're fighting a tiny carb, buddy.

If that doesn't do it, we can cheat a little more but you'll have to pull the carb off to do it.


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Unread 09-12-2014, 05:16 PM   #14
bobdillsworth
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I cant even get it below 20. I ordered that different air jet? 170 and a 175. I wonder if thats why? Or could the idle curcuit be plugged? I did notice some debree in bowl when i pulled the top off to check float level. Had to set it to 40 open 50 closed.
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Unread 09-12-2014, 06:31 PM   #15
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Ok so lets say i run the f7 secondary and f6 primary. What is differance in the f50 and f6? Also with running f6 would any other hets need to be switched so the combination of sizes worked together? I ask because ive actually been learning alot as i try different things and take this apart and see everything and get a good grasp how it all works. Now i am curious of different jetting setups so i might get an idea on good combo to try.


I just took all the jets and everything out and blew air thru the carb and all jets to see if maybe one was blocked. I blew ait thru the air fuel slot and now see how idle circuit works i felt air coming thru the hole. So maybe i should wait for the other air corrector jet so i have the right setup?
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