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Dual Color LED Light Bars White/AmberTJ 5.25" Speaker Adapters - NalinMFGAlloy USA Still Available

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Unread 07-17-2013, 07:04 AM   #751
swatson454
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Spendy little buggers. Ouch http://www.summitracing.com/search/p...l%20separators

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Unread 07-17-2013, 07:32 AM   #752
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Quote:
Originally Posted by swatson454
For those prices, should pull the head on the other motor, send it to a shop, then swap it with this one and clean the carbon off the pistons at the same time.

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Unread 07-17-2013, 12:04 PM   #753
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Quote:
Originally Posted by john strenk
you would have to look at the internal design but usually there are 'things for the oil to catch on and let the air pass.
It could be anything like a perforated steel plate to something like steel wool. It will catch the oil and and let the air go on by.

I see a trend here,
years of blow by, building up an impressive layer of carbon on the pistons leading to pre-ignition. Higher pressures in cylinder = more blow-by = more carbon buildup = higher pressures...
+1000
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Unread 07-17-2013, 12:41 PM   #754
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If you search google for "jeep Holley 390"

You will get a bunch of hits. It appears the primaries range from 46-48.
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Unread 07-17-2013, 04:14 PM   #755
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Quote:
Originally Posted by 86cj74.2L
If you search google for "jeep Holley 390"

You will get a bunch of hits. It appears the primaries range from 46-48.
Maybe my phone is acting up, but most of what I found was regarding fuel pressure....
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Unread 07-18-2013, 08:57 AM   #756
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Quote:
Originally Posted by 86cj74.2L View Post
If you search google for "jeep Holley 390"

You will get a bunch of hits. It appears the primaries range from 46-48.
I can't find a Holley kit for anything in that size range.

So I should probably just order 2 each of 46, 47 and 48.

Should I order any sizes smaller or larger than these (pretty sure current is 51)?
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Unread 07-18-2013, 12:17 PM   #757
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Just buy individual pares of jets. The only kit you will buy is are two big divided trays with two of every jet. And they are not cheep a local autoparts store that sells Holley parts should have them in stock.

After you get the driving around jetting done you will need to rejet the secondary for wide open throttle. I would start out with what ever you have for a primary put in the secondary and see how WOT feels.
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Unread 07-18-2013, 12:39 PM   #758
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I confirmed with Summit that the carb shipped with 51 Primaries.

But they stated that Holley doesn't list any number for Secondaries.

WTF???

This is getting ridiculous. Everywhere I turn is another hurdle.
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Unread 07-18-2013, 01:08 PM   #759
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Quote:
Originally Posted by 2Xtreme
I confirmed with Summit that the carb shipped with 51 Primaries.

But they stated that Holley doesn't list any number for Secondaries.

WTF???

This is getting ridiculous. Everywhere I turn is another hurdle.
I would guess / expect the secondary side are 51 also. I would not worry about them. Holley's can have anywhere from the same jets on primary and secondary to the secondary's being up to 10 more then primary depending on application and how it responds to full throttle.

You should also have a vacuum gauge on a long hose to see what your 45mph on a flat road vacuum reading is to make sure your power valve is correct.

Put the 48's in the primary and warm it up. Re tweek your idle mixture (and idle rpm if effected) then drive it. Pay attention to how it behaves holding a steady throttle. You want to go down in jets Untill you feel a slight surge on a flat road holding a steady throttle on the 35 to 45 mph zone, or you feel a hesitation when on that same road and you just give it a little more throttle. (Say like push down another 1/16 inch)

Once you find that jet go up one. If your fortunate to do this on a low 80 degrees day you will be in the normal temp swing.

There is a catch to all this.............once you know what "Correct" feels like every 20 degree change in temp you will feel the need to change jets. Like a fall winter and spring jet set, and then one for summer.
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Unread 07-18-2013, 01:33 PM   #760
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Originally Posted by 86cj74.2L View Post
You should also have a vacuum gauge on a long hose to see what your 45mph on a flat road vacuum reading is to make sure your power valve is correct.


Once you find that jet go up one. If your fortunate to do this on a low 80 degrees day you will be in the normal temp swing.
I only have to hose that came with the vac gauge, maybe 18".
I'll have to make a longer one up for that.

Holley states to make jet changes in 2-size increments.
So now I'm note sure what I should order, as far as sizes.
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Unread 07-18-2013, 02:05 PM   #761
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Sounds like a pair of 49s and 47s but I'd still verify with my own two eyes what's currently in there. I'd pull the secondary bowl off as well to see what I was working with.
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Unread 07-18-2013, 02:17 PM   #762
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Sounds like a pair of 49s and 47s but I'd still verify with my own two eyes what's currently in there. I'd pull the secondary bowl off as well to see what I was working with.
This is getting deeper into this thing than I had hoped. I dread the thought of opening a carburetor....

Are those secondary gaskets reusable?
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Unread 07-18-2013, 03:17 PM   #763
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Quote:
Originally Posted by 2Xtreme View Post
This is getting deeper into this thing than I had hoped. I dread the thought of opening a carburetor....

Are those secondary gaskets reusable?
I doubt if your gaskets will survive the jetting process. I'd look into something like these when you place your jet order.

http://www.summitracing.com/parts/sum-200050

I doubt if that's the right part number so be sure and check with the counter dude.


Shawn
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Unread 07-18-2013, 04:07 PM   #764
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The blue gaskets are reusable. But with care the black ones can survive once or twice. You don't need to remove the metering block to remove the jets. Just remove the bowl and hold the metering block still and remove the jets it takes 3 to 5 min to do this. Its not hard at all.

I would buy two of each size from 49 to 46. They are cheep.
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Unread 07-18-2013, 04:14 PM   #765
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Place a rag or three under the bowl you're about to drain and loosen/remove one of the lower bowl screws. Hopefully you have the room to catch the fuel into a little dish of some sort.

I agree with 86. You can do this standing on your head. There's nothing to it. Now there is an o-ring on each end of the fuel transfer tube that runs from one bowl to the other so be mindful of them.
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