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Unread 07-06-2013, 04:52 AM   #616
John Strenk
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i've tried it both ways with no difference I can tell.
I ran ported with the YF and manifold with the BBD

I think the thinking on this has changed as the years

originally all that was ever used was ported vacuum.
When emmisions started to come out, There was a couple years both were used.

Then just manifold vacuum was used and shortly their after, the computer was controlling the timing.

all this between 76 and 84.

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Unread 07-06-2013, 08:42 AM   #617
2Xtreme
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Welp, here's the latest.....

Started at 1300 rpm climbed to 1470 over 10 min
Kicked it down, landed at 810 rpm
Hooked up all vac lines, incl. PCV - 1100 rpm

Set Lean Best Idle:
Linkage Side = 7/8 turns out from bottom
Choke Side = 5/8 turns out from bottom
(These results don't seem right to me)

Set idle to 800-ish

Timing jumped to 21.8*

Putting the fender on now, the driving....
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Unread 07-06-2013, 08:45 AM   #618
swatson454
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Good job, dude.

Looks like you'll need to drop down 2 jet sizes like 86 said.


Shawn
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Unread 07-06-2013, 08:55 AM   #619
2Xtreme
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Quote:
Originally Posted by swatson454
Good job, dude.

Looks like you'll need to drop down 2 jet sizes like 86 said.

Shawn
Are those number 'normal'?
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Unread 07-06-2013, 09:02 AM   #620
swatson454
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They show that your jets are a little large. Ideally, they'd be a little over 1 turn out but not more than a turn and a half.


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Unread 07-06-2013, 10:28 AM   #621
2Xtreme
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Drove the Jeep about 3 miles so far. Ran a LOT better! Even stopped better!

However.... It's still pinking, or knocking, whatever you want to call it.

Only seems to do it once it shifts into 2nd, and under load. Haven't hit 3rd with it yet, so idk about that.

Don't know if that's a function of where the timing is now, or......

Got a nice leak, too....
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Unread 07-06-2013, 11:07 AM   #622
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Sound like ign. 'knock'.
You maybe lug'n the eng. and don't know it. What rpm are you shifting at? I shift at no less that 2500.
Switch to prem. gas(what I run).
LG
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Unread 07-06-2013, 12:04 PM   #623
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Quote:
Originally Posted by LumpyGrits View Post
Sound like ign. 'knock'.
You maybe lug'n the eng. and don't know it. What rpm are you shifting at? I shift at no less that 2500.
Switch to prem. gas(what I run).
LG
Basically, I'm right back where I started hundreds of posts again....

Turns out, it seems to do it at the top end of 1st gear, too.

IDK where the shift points are as far as rpm, it's a TH400.
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Unread 07-06-2013, 12:15 PM   #624
swatson454
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You might want to pull about a half a turn out of the vacuum advance. I believe it's an eighth inch allen wrench. Pull the hose off the vacuum advance and stick the long end of the allen wrench into the nipple.


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Unread 07-06-2013, 12:35 PM   #625
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The pig ran out of gas on me while out for my drive.

Had to push the thing up an incline, walk for gas, yadda- yadda, all in the sweltering heat.

Two hours later, I'm home.
But done with it for today.

Yeah, yeah... I know......

Maybe tomorrow....
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Unread 07-06-2013, 12:42 PM   #626
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Quote:
Originally Posted by swatson454
You might want to pull about a half a turn out of the vacuum advance. I believe it's an eighth inch allen wrench. Pull the hose off the vacuum advance and stick the long end of the allen wrench into the nipple.

Shawn
To me, anyway the way your plugs look and the amount of oil in the PCV hose I think you have major carbon buildup inside the combustion chambers. That's not easily removed but possible to get it better using combustion chamber cleaner from BG or what knot. Or spraying a mist of water down the carb throat while bogging the engine at around 1500 rpm for a while.

As for the mixture screws being closed that much. You have a fairly large engine sucking through a small primary. 390/2=195. That air volume is putting one hell of a signal on the metering circuits.

Your Holley hopefully is like all the others in that it has a metering block. Pull it and identify the idle feed restrictor. Then get a piece of stranded copper wire and strip back a few inches and cut off one strand and insert one end in the hole. The other end fold over so the gasket pinches it to hold it in place. That small wire should restrict enough to get you in the sweet spot between 1 and 2 turns out.
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Unread 07-06-2013, 01:04 PM   #627
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Jetting down the little 390 is needed but I don't think that's going to have any effect on the idle metering circuits. Only way is to juggle air bleeds or make the idle restrictor smaller.

Make a simple PCV condenser to catch the oil blowing into the intake. Go to a hardware store and get a air water separator for a air compressor. Make it a taller one like 6 to 8 inches tall, and ensure it has a cindered brass filter, not a white fiber element. Then buy two barbed hose fittings for your hose diameter.

Their will be a arrow showing direction of flow make sure its pointing to the carb.
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Unread 07-06-2013, 01:18 PM   #628
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Quote:
Originally Posted by swatson454 View Post
You might want to pull about a half a turn out of the vacuum advance. I believe it's an eighth inch allen wrench. Pull the hose off the vacuum advance and stick the long end of the allen wrench into the nipple.
The vac advance and not the timing?
the timing is still at the 21.8 or whatever I posted most recently..
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Unread 07-06-2013, 01:19 PM   #629
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Quote:
Originally Posted by 86cj74.2L View Post
Jetting down the little 390 is needed but I don't think that's going to have any effect on the idle metering circuits. Only way is to juggle air bleeds or make the idle restrictor smaller.

Make a simple PCV condenser to catch the oil blowing into the intake. Go to a hardware store and get a air water separator for a air compressor. Make it a taller one like 6 to 8 inches tall, and ensure it has a cindered brass filter, not a white fiber element. Then buy two barbed hose fittings for your hose diameter.

Their will be a arrow showing direction of flow make sure its pointing to the carb.
I've been thinking about doing this.

Guess now I have to....

And that other stuff you said - might as well have been Portugese... lol
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Unread 07-06-2013, 01:24 PM   #630
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Quote:
Originally Posted by 2Xtreme

The vac advance and not the timing?
the timing is still at the 21.8 or whatever I posted most recently..
That timing is what is expected if you chose manifold as your vacuum source.
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