Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
03-30-2005, 07:01 PM | #1 |
71 Cheyenne SWB Fleetside
Join Date: Jan 2005
Location: Sarnia, Ontario, Canada
Posts: 403
|
Need Help Adjusting My Quadra jet
hello,
just wanted to propperly set my carburetor.. its a 71 cheyenne with a 350ci and 350TH. would like to adjust the mixture screw's can i warm the truck up to operating temp and then adjust the screws in one at a time. turn it in untill it stumbles then then turn it out untill it reaches the highest rpm? then do the other side? please help. thanks joel
__________________
|
03-30-2005, 07:37 PM | #2 |
Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,032
|
Heres what the Rochester manual says to do. With the engine idling at the proper speed, turn each mixture screw clockwise until the idle speed drops a noticeable amount. Now slowly turn the mixture screws counterclockwise until the max rpm is reached but no further. Work from one screw to the other and be sure that both screws are about the same number of turns out from the lightly bottomed position; this assures theres a mixture balance, after making this adjustment check your idle speed again to be sure it's correct.
I do all this with a vacuum gauge hooked up to the air cleaner vacuum port and be sure you get the most vacuum out of teh engine at idle so that you're adjusted correctly. This helps be sure you have a good adjustment. Hope this helps some.
__________________
'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
03-30-2005, 07:52 PM | #3 |
Registered User
Join Date: Feb 2005
Location: Lake Crystal, MN
Posts: 656
|
Just kidding. I just did mine and those steps sure helped me.
__________________
-Cory 1967 2 Wheel Chevy |
03-30-2005, 11:36 PM | #4 |
71 Cheyenne SWB Fleetside
Join Date: Jan 2005
Location: Sarnia, Ontario, Canada
Posts: 403
|
hey, i will have to try that out tomorrow..
whats good idle speed? 600-750 or so? thanks again will let you know how i make out. joel
__________________
|
03-31-2005, 01:13 AM | #5 |
got boost?
Join Date: Mar 2005
Posts: 123
|
i use the vacuum guage.just set the idle mixture screws for max vacuum @ the correct idle speed.this means you'll probably be turning the idle screw out a bit.
correct idle speed depends on tranny, engine & cam. 700 rpm is a nice place to start for a stock engine.
__________________
'70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black" |
03-31-2005, 09:07 AM | #6 |
Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,032
|
For an auto tranny I use about 750 or 800. Manuals are from 600 to 800.
|
Bookmarks |
|
|