GLOWING HEADERS

[Jeep Craze]

Alright gang.......just installed a holley 650cfm. tonight after work. Got it running pretty smooth, accelerating nice......only problem is my #4 cylinder header pipe glowes nice and orange. All the rest of them are black. What am I missing? Thanx Craig :rolleyes: I'm sure it is something obvious!

[Lindel]

Check for stuck, or loose (rockers not tightened down) valves. AFAIK, that's all that'll cause that.

[Jeep Craze]

AFAIK???????

[newbie]

could it be running lean?

[River Beast]

<BLOCKQUOTE>quote:</font><HR>Originally posted by 1980j10:
AFAIK???????<HR></BLOCKQUOTE>

As Far As I Know = AFAIK

;)

[River Beast]

oops...hehehe foregot the rest...

My center pipes (4,6 and 5,7) also glow red... always have and I have the 2150 stock 2 bbl.

Just a thin-walled header tube is my guess...

[Jeep Craze]

Alright, well, I might buy that it's a stuck valve....However, I just had the rocker arms and pushrods out to check everyhting make sure it is still ok. Yeah I guess I like working on these things. And as far as running lean......I would buy that but I just wonder why it would only be #4? It is weird but the passenger side headers seem to run hotter than the driver side!ok, that might be the adjustment in the carb....(New Holley 650CFM)but I have the screws set the same! So I thought they would be the same. I am assuming that they are both the same thing. Not that one side is air and the other is fuel.I dunno!!!! I just like the sound it makes at 4000rpm in 2nd gear going through town at 2am! :cool:

[Lindel]

It's most likely that the runners in the manifold aren't sending equal amounts of fuel/air to each cylinder.

Intakes are at best a compromise, and stock manifolds are even more so. If this is the case, you'll be hard pressed to cure the problem.

With the stock exhaust this will never show up, becuase of so much more metal, and another cylinder to "share the wealth", so to speak.

[Crazy_Jeepman]

I have seen manifolds glow red on a tuned engine. Headers will glow in the dark for sure due to the thin walls as was mentioned, as well as the length of that particular tube from head to collector. I see you have noticed that both center tubes are the ones glowing, the reason is they run hotter cause they don't cool down they get the heat from the front and rear tubes as well so the ambient temp around the center tubes is MUCH higher. ;)

[Veepster]

actually glowing red is a rich condition....extra fuel is burning in the headers........

and RB it makes sense that it is your center pipes, those are the cylinders with the easiest access to the fuel..

[Bucky]

I agree with Veepster, too rich. Turn your idle mixture screws in (clockwise) 1/4 to 1/2 turn each. You may also want to jet down a bit, 650CFM is actually a lot of air/fuel, what primary jets are you running now?
If I remember right you should set the screws by turning them in until your engine boggs then out (counterclockwise) 2.25 to 2.75 turns, try them at 1.75 or 2.
Note, changing the idle mixture will only lean it out at idle, to get it leaner in the primary circuit and higher you're going to need different jets.
Bucky

[Jeep Craze]

Ok Well the 650 was a typo......what I have is a 600. At an Idle is when I notice it only on the # 4 cylinder. Does anyone know where to get a 4brl intake Amc 360 (not a new edelbrock) edelbrock ok......but not a new one.To be honest w/ you, I don't know what jets are in it.....it is what ever came from the parts store when I bought the Holley. But even that doesn't matter because I am having problems w/ the vacum secondaries....so I am returning it for a new one.(warranty) Shouldn't the screws on either side of the carb be set the same amount of turns. And holley recomends that they be turned all the way in and then backed out 1.5 turns....minor adjustments to follow. I think if I remember right when the headers were oarange the screws were at 2.5 turns. I have it back to 1.75 now and it is better but it doesn't seem to pick up right from an idle. has a skip at first.....not a backfire....just a little hesitation. But Like I said I am getting another carb....so I will have to go through everything again.Thanx for input, and if anyone knows about an intake let me know....Thanx Craig

[Bucky]

Just an FYI on the hesitation off idle. You can correct that with the accelerator pump linkage. There are so many adjustments to be made on those carbs to get it right. Almost not worth it IMHO.
Bucky

[Jeep Craze]

Ok well I was under the impression that the basic accelerator pupm and linkage was pre calibrated for the jet sizes and such.

[Lindel]

Ain't nuthin on em calibrated!! ;) You'll have to do all the calibrating yourself. Even if you get an Edelbrock, a Holley or a Q-jet. They have to be tuned to what ever engine/vehicle they're attached to.

[Jeep Craze]

ok great well, I think I will let a garaghe do that. :rolleyes:

[Bucky]

I think that when you get a brand new carb it comes with instructions on how to set it up. All you need is a screw driver and a pair of pliers. All of the internals should be set, ie. float level and such, at the factory. It really is a good thing to learn how to do. Especially when your using an aftermarket carb. After you get it down you can start charging your friends to set thiers up. :D
Bucky

[Jeep Craze]

Well bucky Maybe it is something I will lokk into. Although most of my friends aren't back yard mechanics. Guess i'm just lucky like that. I do most everything myslef. Turn to you guys for help when needed....but as far as muscles......they are usually my own. smile.gif But i will try and get it on my own...if I am unable too....I will take it to the garage to do. It needs inspection soon anyway.Thanx Craig