commander_47

Well yeah. Put it on a shelf and don't use it for 25 years? Then put it on a slow no performance motor home and it chugs along fine? Perfect use for a q junk.

Not on my sports car.

People on here occasionally tell me how great they are on the track. I go to the track all the time, and never see them. Lots of Holley, Demon and even Edelbrock. Never a q junk.

Fuel injection is great, and expensive. If carbs were made totally obsolete by fi, then why is Holley going so strong and still in business for 100 years?

q junk was a flash in the pan that quickly was relegated to the salvage yards of time.

TWaldo

Well I for one, can't wait to receive the Qjet Lars has posted about. It seems as though there are passionate owners with many opinions. That's what makes better than other places on this planet.
IMHO...As long as the owner gets a smile when "mashing the throttle"...who really cares what's under the hood?

Tom

lars

Tom -
It's all boxed up and going out to you first thing in the morning . Along with the re-curved distributor, this should run very well for you.

No takers yet on your old carb for use as a paperweight... maybe some people are getting wise to the commercial-built carb problem... Paul is sending his commercially built "pretty" carb out to me tomorrow, so we'll have to do a separate post and expose on that one...

Commando likes to have a little fun with me on the Q-Jets, knowing that I build, test and dyno run just as many Holley/Demon/QF carbs as I do Q-Jets, and knowing that I can get all of them to run at exactly the same power levels... it's all in fun.

Lars

BBCorv70

Some commercial rebuilts come from well known names. I had a "Quadrajet rebuilt by Holley". biggest POS ever. Another rebuilder tried to save it, had to replace the body, mine was too hacked to be salvaged. I finally gave up on it, bought a carb from a forum member, had Lars give it a once over. It's not pretty but runs great!

lars

Actually, some of the worst "remanufactured" Q-Jets come from Holley. Personally, I believe it's an evil plot initiated and headed up by Commando...



Lars

cardo0

Your way to generous lars. I would never expect something like that of u. It is nice of u too offer as i would like a rebuild on my newer Qjet with electric choke and APT for my driver C3. Right now its on the jacks since i pulled the old fuel lines waiting for me to install the new fuel lines along with new fuel tank, fuel pump too.

BTW let me know if i can help u out with a good Qjet core as i have several. Got a numberless carb with divorced choke/chevy inlet and several chevy inlet 800cfm w/elec choke + APT carbs.


When i get my '74 ready i'd like to drop u a line for a carb rebuild,
cardo0

cardo0

We read about plenty of FI conversions that end up as failures too. Mainly as owners think the FI conversion as the "easy" route to fuel management and become so angered after spending thousands instead of hundreds for a new carb they get rid of their entire car. Or thier car sits for years also.
Complicated fuel maps run by manifold absolute press sensors, cold O2 sensors needing heat, electric fuel pumps with higher fuel pressures need regulation, air filter relocation, even intake manifold swaps are not realized until several thousands are already spent.

No the qjet is not a simple carb with triple venturi primary for great sensitivity, an air valve that allows a tremendous range in cfm capacity, fast seconday mixture changes with its hangered metering rods - no $500 laptop needed here for tuning.
Qjet would be junk to someone that doesnt understand it just as FI is junk to someone that cant set it up to work either.

If u want new science then buy a new car,
cardo0

billla

Another great post that will hopefully keep folks from sending their carb off to be destroyed.

Thanks for keeping this nearly lost art alive.

AAJC

Hi Lars,
Thanks for the information in these posts.
Your generosity in sharing your knowledge has help me locate, strip down, & rebuild a "year Specific" Qjet for my 71 BB.
Living Down Under, I dont get to talk with a lot of enthusiasts that want to dive into the Qjet as in depth as you do.
My car has never performed so well & Ive been driving it for over 30 years.



Andy

Blue73Shark

Great write up Lars. Especially the info on type of screws and correct color of the parts. I'll have to take a closer look at mine to verify the originality of mine. It's the details that count.
Fran

Jeff_Keryk

Just because the rebuilder has a well known name does not mean the work is quality. 15 years ago I bought a Q-Jet from the Carb Shop in LA, for $450. It was a good carb that was put together all wrong.
http://forums.corvetteforum.com/c3-t...et-photos.html

Shark Racer

The carbs I like the most are the ones that still have the plugs or limiting caps on the idle mixture screws, pretty much guaranteed no one has been in to those.

RATT7

Great write up Lars, have to agree it's best to find a Qjet that hasent been touched.

Paul L

The "pretty" carb has been shipped to Lars for prognosis and possible restorative surgery.

Capt. Shark

Mine still has those caps intact.. When I sent it to Lars, he said he very rarely sees an unmolested Q-Jet. For that reason, he left them alone. Has run fine for years.

Shark Racer

I have 2 or 3 in my garage that are like that. They have some shelf wear and could stand a good cleaning, but I've got a lot of confidence that they'd be great carbs in service.

lars

I'll mount Paul's Pretty Carb (now to be known as the "PPC") on the run engine in the as-received condition and give it a test run and a photo shoot. I'll start a new thread with test results and photos of the teardown, along with a technical evaluation of the results. I'll then go through the correct setup and repair process to fix whatever we find, and we'll then give it another test on the run engine. Should be a good technical write-up, so watch for it in a week-or-so...

Good participation and comments from everyone in this thread - thanks for all your notes and posts!

Lars

Paul L

I look forward to the assessment of the PPC . You have a good sense of humour!

bobs77vet

happy New Year Lars!

how come my Qjet doesnt look like the rest of them?

lars

Because it's upside-down and it's been broken in half. Weld the two halves back together and flip it over, and you'll be in good shape!