quadra jet help

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04-25-2005, 07:24 PM
53 Chevy5

quadra jet help

is there any one anywhere that can dial in a quadra jet carb good for me. its off of a 77 T/A and i go through this every year. i am soo sick of beating the crap out of the thing trying to get the four barrels set right and the thing just plain leaves alot to be desired all around. i really am thinking that it is warped also.i have put kits in it before but i really dont know how to tune it good. i thought about a new carb but i would sooner spend the bucks on this carb to keep the car original.
04-25-2005, 07:39 PM
lt1s10

Re: quadra jet help

Quote:

Originally posted by 53 Chevy5
is there any one anywhere that can dial in a quadra jet carb good for me. its off of a 77 T/A and i go through this every year. i am soo sick of beating the crap out of the thing trying to get the four barrels set right and the thing just plain leaves alot to be desired all around. i really am thinking that it is warped also.i have put kits in it before but i really dont know how to tune it good. i thought about a new carb but i would sooner spend the bucks on this carb to keep the car original.

http://www.buickpartsdirectory.com/carbs.htm

there is some good reading here chev 5 :cool:
04-25-2005, 08:03 PM
dr_bowtie

Jet chip or edelbrock can if you want to send it to them but, it will cost you some coin! I do all mine. I have a shelf full of them probably 200 or so.... There is a book on how to rebuild and modify a Q-jet and it has all the in's and out's of one....

In order to make a Q-jet fully perform for you, you have to understand exactly how they were designed and operate because of there tempormental nature....

1st of all if you haven't already done it. Pull the rod off the air horn that goes to the choke pull-off....Get a allen wrench and a screw drive and set the air-horn via road testing.....
04-25-2005, 08:23 PM
53 Chevy5

first thanks ls1s10, glad to see you back, i think i'll send it to a link on the car craft site it showed.

Dr Bowtie- thats my biggest problem, i dont know exactly how everything works in them and i am throwing in the towel :CRY:
messing with the air horns was my first mistake i feel i just cant seem to get it right. i messed with them the first time because when i got it , it was a dog and i was told to adjust the air horns. well after i screwed them up i found that the advance in the dist was gummed up solid from years of sitting around. i fixed that and have been fighting everything i touched on the carb ever since :LOL:
04-25-2005, 09:48 PM
treekiller

Quote:

Originally posted by dr_bowtie
There is a book on how to rebuild and modify a Q-jet and it has all the in's and out's of one....

In order to make a Q-jet fully perform for you, you have to understand exactly how they were designed and operate because of there tempormental nature....

.....

"if ya don't mind me asking ?"
whats the name of the book ?

T L
04-27-2005, 06:36 PM
53 Chevy5

heres the carb numbers 17057263 0637 ARL
i was warming it up to change the oil and when i put her to the wood it said blaaaaaaaa. i was reminded that the 4 brls were opening up way too fast.

the car is slightly cammed, i dont remember size :confused: and the compression has been bumped up to 9.5:1 if that matters. thanks for any help.

also, do you have any idea what the total timing should be on this thing or what springs in the dist for the advance curve? its a 4 speed with 3.23 gear and it runs about 2,700 at 60mph if i remember right, and if it matters.
04-27-2005, 06:57 PM
lt1s10

Quote:

Originally posted by 53 Chevy5
heres the carb numbers 17057263 0637 ARL
i was warming it up to change the oil and when i put her to the wood it said blaaaaaaaa. i was reminded that the 4 brls were opening up way too fast.

the car is slightly cammed, i dont remember size :confused: and the compression has been bumped up to 9.5:1 if that matters. thanks for any help.

also, do you have any idea what the total timing should be on this thing or what springs in the dist for the advance curve? its a 4 speed with 3.23 gear and it runs about 2,700 at 60mph if i remember right, and if it matters.

here is another address to go to chevy5, it tells you how to adj. the 4 brls. about 1/2 way down. if you know where the 3/32 allen head set screw is then you should be able to read this and set it .

http://www.442.com/oldsfaq/ofcrb.htm
04-27-2005, 07:02 PM
techinspector1

treekiller....

http://www.amazon.com/exec/obidos/tg...books&n=507846

Doug Roe was a GM engineer and is considered by many to be the all-time guru, swami, what-am of Quadrajets.
04-27-2005, 07:49 PM
53 Chevy5

i'll give it a whirl, i have a 3/32 allen and a small flat in the console of th T/A :p . dont expect a speedy response if tommorow's motivation was like today. i drained the oil in the ta tonight but i thought that was enough, i'll put oil back in tommorow. :LOL:
04-28-2005, 06:23 PM
53 Chevy5

ok, i got the oil in and adjusted the secondaries screw to 5/8 now heres the symtoms. in 4th gear punching it at 60 they sound real nice pulling hard maybe a little on and off hesitation. if i'm given it the cranberrys from 1st on up i can hear the secondaries are trying to open but it surges pretty noticeably, its like its saying give me more fuel, thanks now give me more again. at one time i could get some second gear rubber out of this thing not now.

by the way i forgot how cool this thing sounds idleing, rumpity tump tump, potatoe potatoe potatoe :cool:
04-28-2005, 08:14 PM
53 Chevy5

ya thats kinda what i thought too but i thought that would be too simple for me, got side tracked and didnt get to do that yet. one other thing i was looking at was the 2" exaust coming off the manifold and where it bends to a 90 it looks like theres no way all that exaust could go through there. i know that isnt my main problem but would i gain much from putting 2 1/4 exaust on from the manifolds to the mufflers, there is already 2 1/4 from the mufflers back. i knowi'm talking like an idiot who doesnt know anything, but i think i actually dont know as much as i think i do after being on this site for awhile .:HMMM:
04-28-2005, 10:51 PM
treekiller

Thanks Tech !

I've seen a few of'em but didn't know which one "They" :rolleyes:
we're talk'N bout .

T L :3dSMILE:
04-29-2005, 12:14 AM
treekiller

denny I just ordered this one http://www.amazon.com/gp/product/off...?condition=all ""Rochester Carburetors: Tune, Rebuild or Modify
by Doug Roe"",a few sec. ago ......... same guy ................... "same book ? "
if the link don't work ,it's the same one Tech posted but "used"

"you guys were in deep thought":rolleyes: so I just kept checking back .
:LOL:

T L
05-02-2005, 07:33 PM
53 Chevy5

well i adjusted the air horns back and forth a little and it still has the surging thing going on, worse when the horns are tightend and better when thier loose it never comes completly out of it and when i adjust them any looser then im into the bog range. i've never paid any one to work on anything of mine before but i am really looking forward to getting the bill from the carb shop after i send this thing off:p .

ps. hey Denny, do ya think a Ford motor would help :LOL: :LOL:
05-02-2005, 07:41 PM
lt1s10

Quote:

Originally posted by 53 Chevy5
well i adjusted the air horns back and forth a little and it still has the surging thing going on, worse when the horns are tightend and better when thier loose it never comes completly out of it and when i adjust them any looser then im into the bog range. i've never paid any one to work on anything of mine before but i am really looking forward to getting the bill from the carb shop after i send this thing off:p .

ps. hey Denny, do ya think a Ford motor would help :LOL: :LOL:

you really would be boging down then. :LOL: :LOL:
05-02-2005, 08:06 PM
53 Chevy5

Mike says no and Denny seems to think it will help, maybe i should stick with the Chief Pontiac ;)
05-02-2005, 08:09 PM
lt1s10

Quote:

Originally posted by 53 Chevy5
Mike says no and Denny seems to think it will help, maybe i should stick with the Chief Pontiac ;)

just like everything else on this forum, nobody agree on nothing.:LOL: :CRY:
05-02-2005, 08:26 PM
dr_bowtie

I have the book "treekiller" ordered....I studied as did Denny...

When you have "surge" now with the air horn adjusted it is now fuel related ....Too lean or rich? check the plugs....what color are they...also check fuel flow ...make sure your getting enough...Q-jets sip gas till you plant it to the wood then it's like flushing a toilet! need to know where you are in mixture before we get into rod numbers and sizes...
05-03-2005, 04:14 PM
dr_bowtie

Lets also not forget the prones of the Q-jet....

1) Take off the air cleaner and stand over the carb and actuate the rear air door open and closed. As you are doing so pay close attention to the rod hanger that pulls the rods out of the secondary jets...You'll want to make sure that both rods are hanging on the hanger.....

They are prone to fall off if the hook isn't fully bent.

2) secondary emulsion tubes....These are prone to fall out! usually just one side and will run with surge like symtoms just like a fallen rod... Fixing will require pulling the top off the carb....

Listen to the engine when it's doing what is doing. It will tell you wether it's lean or rich...

If it seem to run smooth while surging and pulling then not pulling.....It's lean

If it's crakle-ing while surging and not pulling.....it's rich....

It is very important to have adequate fuel pressure at all rpm's when you tip open the secondaries on a Q-jet....

Later one if you still have trouble we may have you pull the rod&hanger and list what is on the rods and hanger.....

Funny thing...Did you know they actually put Q-jet on early Mustangs....I beleive the 67-69 427-429 units....I have one is how I found out....It should be listed in your book Denny....
05-03-2005, 07:48 PM
53 Chevy5

thanks abunch for the help you guys gave me on the QJ, but i have it boxed up ready to ship off. have you ever been to the point that you soo sick of somthing that you cant stand to touch it any more? that the way i feel about my carb. another reason i'm sending it of is because this place replates the carb in the proper gold and silvers and my carb was the uglyest thing left in the engine bay. when its running again i will have to give more info on the fuel pressure and the timming curve just to get it all perfect. i wish i knew and was as comfortable working on carbs as you guys but i only have one vehicle with a carb anymore so my experimenting with them is very limited. i'll give you an update when its back on how its running. ( it probably wont be any different because my timing and fuel pressure is screwed up and not the carb :CRY: :LOL: )