I could use some carburetor ideas.

J-(Chicago) · January 6th, 2009, 04:46 AM

I picked up 2 Qjets this past weekend. They are both 1975 350 olds carbs.

I have no idea why these things have the regular power piston and rods,
AND 2 extra rods without removable jets. One rod is on an adjustable cylinder about 7/8'' wide, and the other looks like a regular primary power piston, except with one of the rod bosses cut off.

These things are weird. they Also have 67 jets in them.

Has anyone ever modified one of these 75's to work like the oldies'?

I made a round of phone calls to the usual neighborhood auto joes, and they all thought I was describing a U.F.O.

Oldsguy · January 6th, 2009, 05:30 AM

I bet Dan (70Wcars) could help you out, he is a carburetor guru.

Danny Wiseley · January 6th, 2009, 02:53 PM

My brother's 75 H/O came with what he called an "altitude compensating" carburetor. I haven't looked closely at it, as it has never given any trouble. He drove it about 190k before he parked it.

Oldsmaniac · January 6th, 2009, 03:12 PM

What were you expecting to find?......computer controlled carbs I believe were 1982 issue...from what I remember the 75 Qjet is pretty similar to the earlier ones.

J-(Chicago) · January 6th, 2009, 03:42 PM

Quote:

Originally Posted by Oldsmaniac

What were you expecting to find?

Certainly not an extra pair of rods and seats.

It's very similar. I just wanted to understand these extras' functions, before I start slinging solder and epoxy about.

BILL DEMMER · January 6th, 2009, 08:12 PM

auxiliary metering system, and the altitude compensation (aneroid device) to make the carb. work properly. try not to do anything non-reversible to it.

bill

J-(Chicago) · January 6th, 2009, 09:32 PM

http://carburetor-manual.com/rochest...ment-a-36.html

and

http://carburetor-manual.com/rochest...dels-a-34.html

Thank you Mr. Demmer. I found these 2 articles on this.

f-85 · January 6th, 2009, 09:53 PM

Hey Jeremy

What do you plan to do with all these carbs? You have to have at least 10 rebuilt carbs now. LOL

J-(Chicago) · January 6th, 2009, 10:00 PM

Both carbs are in decent shape, but there is a thin metal tab where the accelerator pump shaft goes through the air horn that has been damaged, and a metal plug rattling around underneath an access plate in front of it.

I want to just make them functional and drag strip adjustable again.
These were old student carburetors from a local high school. The new tech teacher, (a local gar guy I trade parts with) saved them for me when the school was throwing out all the old education program's carbs. (He's a fuel injection only guy)

The school threw out a whole cabinet full of all types of old carbs, and he only saved me this junk

Oh well, it's the thought that counts. I couldn't yell at him.

J-(Chicago) · January 6th, 2009, 10:08 PM

Quote:

Originally Posted by f-85

Hey Jeremy
What do you plan to do with all these carbs? You have to have at least 10 rebuilt carbs now. LOL

Basically, I'm trying to have 6 or 7 carbs with different rod/jet setups for tuning at the track. I'm going to wire up the secondary locks, and tune for best primary jet times. The secondarys are easy to tune. 1 screw, lol.

f-85 · January 6th, 2009, 10:54 PM

Quote:

Originally Posted by J-(Chicago)

Basically, I'm trying to have 6 or 7 carbs with different rod/jet setups for tuning at the track.

You running the beast again next year?

J-(Chicago) · January 7th, 2009, 03:54 PM

Probably.
Unless it catches fire or folds in half.
I gotta keep my throne in the Piece O' Junk class.

I like the shock factor of running a $200 car with all the $40K cars.

f-85 · January 7th, 2009, 04:09 PM

Yeah its cool seeing it on the track. Well lets shoot for 13s!

J-(Chicago) · January 8th, 2009, 05:28 PM

F.Y.I.
These things have a unique power piston setup too

The primary piston doesn't have a nipple seat like the 68-74 style.
These just have a cup with no lower boss, and are shorter. I may not even be able to swap any primary rods now.

January 6th, 2009, 04:46 AM	#1 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	I could use some carburetor ideas. I picked up 2 Qjets this past weekend. They are both 1975 350 olds carbs. I have no idea why these things have the regular power piston and rods, AND 2 extra rods without removable jets. One rod is on an adjustable cylinder about 7/8'' wide, and the other looks like a regular primary power piston, except with one of the rod bosses cut off. These things are weird. they Also have 67 jets in them. Has anyone ever modified one of these 75's to work like the oldies'? I made a round of phone calls to the usual neighborhood auto joes, and they all thought I was describing a U.F.O. __________________ I'd rather have a numbers matching poker hand.

January 6th, 2009, 05:30 AM	#2 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	I bet Dan (70Wcars) could help you out, he is a carburetor guru. __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

January 6th, 2009, 03:12 PM	#4 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	What were you expecting to find?......computer controlled carbs I believe were 1982 issue...from what I remember the 75 Qjet is pretty similar to the earlier ones. __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

January 6th, 2009, 08:12 PM	#6 (permalink)
BILL DEMMER Just the facts... Join Date: May 2008 Location: THE GREAT WIDE-OPEN Posts: 208	auxiliary metering system, and the altitude compensation (aneroid device) to make the carb. work properly. try not to do anything non-reversible to it. bill __________________ '67 CUTLASS 4-DR. W/425 & S.P. THM400 (NAMED "ERNIE") '83 H/O #1339(STILL IN PIECES) '85 PONTIAC FIERO SE V-6 4-SPD. BOUGHT NEW '92 CHEBBY DIS-ASTRO (GAS PIG) '97 GYRO METRO $HYTBOX (41.42 MPG) Last edited by BILL DEMMER; January 6th, 2009 at 08:15 PM..

January 6th, 2009, 09:32 PM	#7 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	http://carburetor-manual.com/rochest...ment-a-36.html and http://carburetor-manual.com/rochest...dels-a-34.html Thank you Mr. Demmer. I found these 2 articles on this. __________________ I'd rather have a numbers matching poker hand.

January 6th, 2009, 02:53 PM	#3 (permalink)
Danny Wiseley Registered User Join Date: Mar 2007 Location: West of Lubbock, TX Posts: 160	My brother's 75 H/O came with what he called an "altitude compensating" carburetor. I haven't looked closely at it, as it has never given any trouble. He drove it about 190k before he parked it.

January 6th, 2009, 09:53 PM	#8 (permalink)
f-85 Registered User Join Date: Aug 2007 Location: Yorkville,il Posts: 279	Hey Jeremy What do you plan to do with all these carbs? You have to have at least 10 rebuilt carbs now. LOL __________________ 1964 4DR F-85 455 1964 Olds Super 88 394 (sold to my buddy) 1958 International A-100 Project

January 6th, 2009, 10:00 PM	#9 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	Both carbs are in decent shape, but there is a thin metal tab where the accelerator pump shaft goes through the air horn that has been damaged, and a metal plug rattling around underneath an access plate in front of it. I want to just make them functional and drag strip adjustable again. These were old student carburetors from a local high school. The new tech teacher, (a local gar guy I trade parts with) saved them for me when the school was throwing out all the old education program's carbs. (He's a fuel injection only guy) The school threw out a whole cabinet full of all types of old carbs, and he only saved me this junk Oh well, it's the thought that counts. I couldn't yell at him. __________________ I'd rather have a numbers matching poker hand.

January 7th, 2009, 03:54 PM	#12 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	Probably. Unless it catches fire or folds in half. I gotta keep my throne in the Piece O' Junk class. I like the shock factor of running a $200 car with all the $40K cars. __________________ I'd rather have a numbers matching poker hand.

January 7th, 2009, 04:09 PM	#13 (permalink)
f-85 Registered User Join Date: Aug 2007 Location: Yorkville,il Posts: 279	Yeah its cool seeing it on the track. Well lets shoot for 13s! __________________ 1964 4DR F-85 455 1964 Olds Super 88 394 (sold to my buddy) 1958 International A-100 Project

January 8th, 2009, 05:28 PM	#14 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	F.Y.I. These things have a unique power piston setup too The primary piston doesn't have a nipple seat like the 68-74 style. These just have a cup with no lower boss, and are shorter. I may not even be able to swap any primary rods now. __________________ I'd rather have a numbers matching poker hand.

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