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Topic: Quadrajet replacement options?

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Quadrajet replacement options? (65/75)
3/21/10 9:58pm

cthulhu

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Hot Springs, AR - USA

Vette(s):
69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3231

im glad it worked out for you...

hopefully that vacuum hose was the main source of your problem. a vac leak is a big deal.

shipping is better than paying for everything.

as for CF.. like I said.. if you disagree with lars or one of his many parrots you get flamed and that is why I dont go over there. If the point iof the c3 forum there is having one guy share his opinion and a hundred people regurgitate it then they have suceeeded.

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Quadrajet replacement options? (66/75)
3/22/10 4:23pm

KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Hey Adam,

It sounds like you may have nailed it. I'm hoping that a good, long ride will give you trouble free results.

Let us know how it goes.

P.S. My exhaust had a rattle that was caused by the flap on the passenger side exhaust manifold. I wired it open and the problem was easily solved.

Kevin

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Quadrajet replacement options? (67/75)
3/22/10 4:57pm

nosal1
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Dunedin, FL - USA

Vette(s):
1980 Corvette Torch Red with Gold metallic 370HP/350 CU.IN.Turbo 350 w/shift kit.Originally CA.Car with 305 CU.IN.

Joined: 3/21/2006
Posts: 262

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Quadrajet replacement options? (68/75)
3/22/10 6:34pm

dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

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Posts: 1958

nosal1 ! What is it you wanted to say?????

Dan

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Quadrajet replacement options? (69/75)
3/22/10 7:06pm

Sorry Guys,

                I hit the wrong switch and it went off in my hands..It was a few comments on replacing my Q-Jet with Edelbrock carb.
                I resorted to sending message directly to Adam and he may possibly send it to this forum.
                 In short I have substituted many Q-Jets to Edelbrocks with a great deal of success and increased the performance/operation of the engines,however the gas mileage differs quite a bit and should be considered as the Eddy's are not what you would call an asset as far as MPG as the Q-Jets...The small primaries of the Q-Jet help the mileage as long as you don't go into and stay in the secondaries,the go fast mode.....

                 Again, I apologize for my ineptness on the computer..

                 Have a great day all.............

   nosal1

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Quadrajet replacement options? (70/75)
4/7/10 4:25pm

KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Adam,

Were you able to test it out on a good long ride?

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Quadrajet replacement options? (71/75)
4/7/10 4:38pm

Adam Wartell

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C3VR Founder
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Eagleville, PA - USA

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Used to own a 1979 Corvette now owned by JB79

Joined: 11/1/2001
Posts: 17642

[QUOTE=KDADDY79]

Adam,

Were you able to test it out on a good long ride?

[/QUOTE]

Nope. Not yet.

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-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

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Quadrajet replacement options? (72/75)
4/8/10 10:06am

Adams' Apple

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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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Dang...I been missin this thread for a while. Glad ya got the vac. leak fixed there, Boss.

And...to Ben...yer such a troublemaker!!!

I just now went to CF and read thru Adam's thread....

Now ya know why I love this place so much! Everyone's opinion/facts are accepted, and you can either take the advice/info, or not...up to you. No "I know everything about everything because I read it on the internet" attitudes here.

I have often stated that some procedures work well for me, but not might for someone else. That's just the way it is.
Sorry for the "off topic" garbage....I'm done now.

I hope the vac advance lines cures your engine problem, Adam. I bet it does, and your fule mileage should also improve.
Adams' Apple2010-04-08 07:07:42

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Quadrajet replacement options? (73/75)
4/9/10 1:21am

kstyer

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CUYAHOGA FALLS, OH - USA

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1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6424

I know I haven't been on much. But I support the q-jet, which now seems to be working.

A carb is often blamed when a car does not run correctly, and there are other problems present. I am really interested in knowing how the car runs after a bit of an extended drive. I have a vested interest in this one. I was the third rebuilder. Adam sent the carb to me in a box. I rebuilt it, but do not have a flow bench. He put it back on, and it was better. Some time after that, Adam and I got together here in Ohio, and I made many adjustments. It sat over night to confirm the choke operation. Back to PA he went. It was a nice visit, but very short.

I did not have a chance to do a full engine analysis. At that time, the hose was okay. But that's been a couple of years.

Adam, before repacement, make sure all the other things on the engine are connected and working properly. And there are many, all of which can cause problems. As you now know, the little things make a huge difference. I hope this remains just minor things.

Before taking a big plunge, give me a call. Maybe I can help.

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Quadrajet replacement options? (74/75)
4/9/10 11:45am

philip
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Marana, AZ - USA

Vette(s):
1982 Silver Blue

Joined: 4/8/2010
Posts: 104

Adam you made the right decision in keeping your Qjet. I am feeding a 406 small block with one and it dyno'd at over 450 hp. When properly set up they will run with the best of the performance carbs and get better mpg when your little pedal is just caressed rather than being slammed against the carpet.
The model you have can be easily converted to an electric choke by replacing the cover with an electric unit and plugging the heat tube line with a rubber plug. The power will need to be a new line from an ignition on source, but do not use the distributor feed.

Pic 1

Primary and secondary metering rods, primary jets can be changed to tweak the carb for performance. The biggest mistake made is in the setting of the secondary air flap. Since it also controls the depths of the rods in the jets allowing it open to soon will make it bog. this is easy to adjust with an allen wrench and screwdriver.

Tension Spring adjusting screw

(modified LARGE pics to links)
Adams' Apple2010-04-09 10:16:16

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Quadrajet replacement options? (75/75)
4/9/10 7:11pm

cthulhu

[QUOTE=kstyer]I know I haven't been on much. But I support the q-jet, which now seems to be working.

[/QUOTE]

good to see you back...

______________

http://www.vetteprojects.com/bmv

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