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Posted: Thu
Apr 10, 2008 10:35
am Post subject: Quadrajet info - more than you wanted to know
Here is a link to a q-jet tuning guide I ran across that is really a lot of awesome information as well as how to diagnosis problems. You carb tuners will love this if you have never seen it.
EDIT - I fixed the link to the right page
q-jet info _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
Necoa #: 5673
Location: 2(CT,MA,ME,NH,RI,VT)
Joined: Jun 26, 2005
Posts: 833
Year: 1970
Model: El Camino
Posted: Fri
Apr 11, 2008 4:54
pm Post subject:
Q-jets are decent carbs (IMO). A little "finniky" to get right, but overall great performers. Only thing they lack is accelerator (SP?) pumps on the fire hydrant sized secondaries. I LOVE those tiny primaries. Perfect for precision fuel metering and efficient cruising.
Decent carb overall, just not a racing/high performance carb (though they can come close in some venues with a Q-jet expert and a great deal of TLC). _________________ 70 Elky (Non-SS) 454CID, TH700-R4
69 Chev C-10 Pickup (recently Upgraded to 454) w/TH400
29 Model A (Recently Sold).
Necoa #: 2321
Location: 15(AZ,NM)
Joined: Jan 30, 2004
Posts: 1014
Year: 1974
Model: El Camino
Posted: Sat
Apr 12, 2008 5:04
am Post subject:
mnunn wrote:
Q-jets are decent carbs (IMO). A little "finniky" to get right, but overall great performers. Only thing they lack is accelerator (SP?) pumps on the fire hydrant sized secondaries. I LOVE those tiny primaries. Perfect for precision fuel metering and efficient cruising.
Decent carb overall, just not a racing/high performance carb (though they can come close in some venues with a Q-jet expert and a great deal of TLC).
I dunno, the same generation GTO as your Elky had some awesome 828CFM models on the pontiac 455's. They seem to scoot pretty good...
_________________ 74 El Camino Classic - project car #1
96 Camaro - RIP, Traded 10-16-2007
2008 Mustang GT, It ain't a Chevy but at least it's American!
exactly the same Jim. The duajet just doesn't have the secondaries on it. Just ignore anything pertaining to the secondaries and as you said in your post - You used the quadrajet metering rods to get it running. _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
Necoa #: 8721
Location: 13(TX)
Joined: Dec 22, 2006
Posts: 331
Year: 1983
Model: El Camino
Posted: Thu
May 15, 2008 9:13
pm Post subject:
I did a bit more adjusting on the idle mixture and was able to get the 20 RPM drop as I leaned it out so it looks like I don't have a vacuum leak. It still isn't as smooth as it was with the Q-Jet, but I should be able to attain that with a bit more work. It still seems to be lean at highway speeds because accelerating at 40 mph causes a backfire occasionally. Maybe the metering jets are not moving out when the vacuum drops. I will have to look into that.
BUT...i will not remove that power piston again until someone tells me the secret of getting both those metering rods back in the jets at the same time. There must be some secret, but I haven't found it yet and it takes 5 minutes of "fiddling" before they will suddenly just slide in. _________________ Jim
1983 El Camino
Put them in before you put the big plastic block in. You can see what you are doing. _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
Necoa #: 8721
Location: 13(TX)
Joined: Dec 22, 2006
Posts: 331
Year: 1983
Model: El Camino
Posted: Fri
May 16, 2008 9:25
am Post subject:
I cant do that. The piston and the two rods go through the holes in the block. If I disassemble them I cant see any way to reassemble them after putting in the block since they have to tilt to the side to thread them into the holes on the yoke??? Do I miss something here?? _________________ Jim
1983 El Camino
No your not missing anything. Some of the blocks are made that way. _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
I wouldn't modify that block. It is easier to just pull the carb and make the changes you need and then put it back. by the time you pull the top there are only a couple of vacuum lines and two nuts to get it off where you can look down past the block and guide the metering rods into place. _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
Necoa #: 8721
Location: 13(TX)
Joined: Dec 22, 2006
Posts: 331
Year: 1983
Model: El Camino
Posted: Fri
May 16, 2008 4:10
pm Post subject:
A "couple of vacuum lines" a Furel line, several linkages, and a fuel canister line.
No, I think rather than pull it all the way off I will see if I can find a block that was made that way, Or, since I have a spare from the Q-Jet, I might try modifying it and see what happens. _________________ Jim
1983 El Camino
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