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Unread 02-24-2014, 09:03 PM   #31
LumpyGrits
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The gasket will seal that area.
Never seen those little round seals before......
BTW-The FSM was wrong with the location to measure the piston gap. Your rebuild kit has it 'rite'.
IIRC-There was a service bulletin issued over that error.
LG

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Unread 02-24-2014, 09:21 PM   #32
86cj74.2L
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Quote:
Originally Posted by LumpyGrits
The gasket will seal that area. Never seen those little round seals before...... BTW-The FSM was wrong with the location to measure the piston gap. Your rebuild kit has it 'rite'. IIRC-There was a service bulletin issued over that error. LG
That's good to know.
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Unread 02-24-2014, 09:26 PM   #33
moto450r
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Quote:
Originally Posted by LumpyGrits
The gasket will seal that area. Never seen those little round seals before...... BTW-The FSM was wrong with the location to measure the piston gap. Your rebuild kit has it 'rite'. IIRC-There was a service bulletin issued over that error. LG
Oh boy, well it's easy to adjust. I think I'm going to use the install kits measurement, for some reason it looks like its correct.

Thanks LG
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Unread 02-24-2014, 09:37 PM   #34
LumpyGrits
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Use a wire spark plug gap gauge, to set that gap.
LG
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Unread 02-24-2014, 09:42 PM   #35
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or a gauge when you set valves. either or. Im working on a non stepper bbd off of a j20 as we speak. the guy bought a new bbd and gave me the old one as payment for helping him set the new one up
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Unread 02-24-2014, 10:32 PM   #36
moto450r
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Quote:
Originally Posted by LumpyGrits
Use a wire spark plug gap gauge, to set that gap. LG
Hey were you peeking?
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Unread 02-24-2014, 11:30 PM   #37
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ordered some new jets from this place

http://www.carburetor-parts.com/
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Unread 02-25-2014, 04:29 AM   #38
John Strenk
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I have a couple of BBD's with mismatched jets also. I wonder why?

I seen both sets of needles mentioned and even different springs used in the piston.

You can see how mixing and matching parts would make for some interesting A/F ratios.
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Unread 02-25-2014, 06:38 AM   #39
Mike Romain
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Originally Posted by John Strenk View Post
I have a couple of BBD's with mismatched jets also. I wonder why?

I seen both sets of needles mentioned and even different springs used in the piston.

You can see how mixing and matching parts would make for some interesting A/F ratios.
For some reason each barrel of the carb 'appears' to feed 3 cylinders according to the spark signal I see with a timing light when I am dealing with one plugged idle tube. It seems the inboard barrel appears to feed cylinders 1-3 and the outboard seems to feed 4-6. I have noticed on some that plugs 1-3 show slightly richer than 4-6. Maybe AMC was trying to balance this on some models?
Just a wild guess.
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Unread 02-25-2014, 06:47 AM   #40
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Quote:
Originally Posted by Mike Romain
For some reason each barrel of the carb 'appears' to feed 3 cylinders according to the spark signal I see with a timing light when I am dealing with one plugged idle tube. It seems the inboard barrel appears to feed cylinders 1-3 and the outboard seems to feed 4-6. I have noticed on some that plugs 1-3 show slightly richer than 4-6. Maybe AMC was trying to balance this on some models? Just a wild guess.
That's highly possible. On my motorcycles the inner carbs had leaner needles and main jets to account for the center cylinders running hotter than the outside

Would the rear cylinders on the 258 run hotter than the front or colder than the front? I guess a temp gauge in the t-stat housing and the one towards the back of the head would be a comparison..........
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Unread 02-25-2014, 08:22 AM   #41
John Strenk
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I would tend to think the inner cylinders run richer than the end cylinders.

But doesn't the carb just dump into a plenum?

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Unread 02-25-2014, 08:31 AM   #42
Mike Romain
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I would tend to think the inner cylinders run richer than the end cylinders.

But doesn't the carb just dump into a plenum?

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Well, the inboard port is closer to the engine in the opening so it likely has slightly more vacuum maybe? If they were side by side, then it should draw even, but not that way.

When folks blow headgaskets and/or have ring issues, it is usually at the cylinder 6 or 5 area. That is where my old engine lost all its compression. 5 was dead.
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89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 02-25-2014, 11:12 AM   #43
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The carb is supplying the fuel air mixture to the manifold and there are no secondary's so the only thing I can come up with is that the "Outboard" (looking forward from the drivers seat) "barrel" has the vacuum port blocked. Where the inboard barrel has a vacuum port open for use. Maybe there is a fuel/air mixture difference because of the way the carb barrels provide, or don't provide a vacuum source?
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Unread 02-25-2014, 11:15 AM   #44
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Got the carb back on this morning. Starting the tuning phase.
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Unread 02-25-2014, 11:37 AM   #45
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The blocked vacuum port on the outboard barrel is the emissions port which jeep doesn't use. They chose to use the ported ignition vacuum instead via the CTO.
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