Whats the Problem??
Burning Brakes
Joined: Oct 2015
Posts: 781
Likes: 113
Chandler..the original floats on cars that are the age of ours have a bad tendency to get loggy and unresponsive..The upgraded brass float is a great upgrade for the original carb rebuild.
As you progress and get the old Rochester cleaned, rebuilt..run only ethanol free gas in your L48..Your car will thank you for the extra cost of good fuel..Alcohol is a killer for carburated engines..lawnmowers, chainsaws, old cars..
I am fortunate that I found an older fellow with 40 years of good experience with the old carbs who did the work on my Rochester carb very well..There should be some local men who can do the work properly and right on your carb..Check with the collector car and hot rod clubs where you live..
Beyond that..Lars and a few others will do the work on your carb..but it'll take time and SOMEONE still has to remove and then re-install the rebuilt-renewed carb and set and adjust ALL properly for the finer tuning-timing issues..Jim
As you progress and get the old Rochester cleaned, rebuilt..run only ethanol free gas in your L48..Your car will thank you for the extra cost of good fuel..Alcohol is a killer for carburated engines..lawnmowers, chainsaws, old cars..
I am fortunate that I found an older fellow with 40 years of good experience with the old carbs who did the work on my Rochester carb very well..There should be some local men who can do the work properly and right on your carb..Check with the collector car and hot rod clubs where you live..
Beyond that..Lars and a few others will do the work on your carb..but it'll take time and SOMEONE still has to remove and then re-install the rebuilt-renewed carb and set and adjust ALL properly for the finer tuning-timing issues..Jim
Team Owner
Joined: May 2001
Posts: 87,294
Likes: 1,579
From: Western NY
Since 1958, I've lived in the Rochester, NY area, home of Rochester Products, the Q-Jets' birthplace. In the mid 60s through the late 70s, I had a neighbor who was both a drag racer, as well as a Rochester Products line technician. He taught me a lot about carbs, provided me with a number of RP tech manuals, and I've successfully rebuilt several Q-Jets. However, the last time I touched one, was around 1993, and although I might be able to go through one, I certainly wouldn't look forward to it....
Last edited by leadfoot4; Oct 3, 2016 at 12:41 PM.
Burning Brakes
Joined: Oct 2015
Posts: 781
Likes: 113
THAT'S the "stumbling block" with the Rochester Q-Jet, the adjustments. Doing a "rebuild" of one of them, while more complicated than a Holley, still can be accomplished by a reasonably skilled person. But doing all of the adjustments that are required, is where it gets really tricky.
Since 1958, I've lived in the Rochester, NY area, home of Rochester Products, the Q-Jets' birthplace. In the mid 60s through the late 70s, I had a neighbor who was both a drag racer, as well as a Rochester Products line technician. He taught me a lot about carbs, provided me with a number of RP tech manuals, and I've successfully rebuilt several Q-Jets. However, the last time I touched one, was around 1993, and although I might be able to go through one, I certainly wouldn't look forward to it....
Since 1958, I've lived in the Rochester, NY area, home of Rochester Products, the Q-Jets' birthplace. In the mid 60s through the late 70s, I had a neighbor who was both a drag racer, as well as a Rochester Products line technician. He taught me a lot about carbs, provided me with a number of RP tech manuals, and I've successfully rebuilt several Q-Jets. However, the last time I touched one, was around 1993, and although I might be able to go through one, I certainly wouldn't look forward to it....
Well said...vac advance, choke, idle, lean-rich..and then timing..plugs, wires, dist..A whole world of small fine adjustments to get these older cars running their best..and efficiently..Jim
Drifting
Joined: Feb 2005
Posts: 1,879
Likes: 38
From: Los Gatos CA
From another point of view, after Lars rebuilt my Q-Jet, I bolted her on, hooked up the linkage, switched choke wire and primed the carb. Fired right up, warmed up and idled nicely. I adjusted the idle speed a little and that was it.
https://www.corvetteforum.com/forums...et-photos.html
https://www.corvetteforum.com/forums...et-photos.html
Last edited by Jeff_Keryk; Oct 4, 2016 at 12:24 AM.
Team Owner
Joined: May 2001
Posts: 87,294
Likes: 1,579
From: Western NY
Racer
Joined: Feb 2002
Posts: 378
Likes: 19
The fuel spilling maybe be because the needle valve was stuck open, by debris that somehow made it pass the filter. The carb filled with fuel leaking out the accel pump hole and wherever else, as well as shutting off the mtr.
Great that you have an original carb and even better that it appears to be untouched.
I've had www.custom rebuiltcarbs.com, that are in New Jersey rebuilt a Q-Jet from a PC that I was working on with good results. Custom Rebuilt does great stuff, like repair the primary side of the throttle shaft, by inserting bushings to eliminate wear that occurs over 28 years of use. They bench test all their work assuring that it functions properly, before sending back to it's owner.
Think that your fuel spilling was because the needle valve was stuck open, by debris that somehow made it pass the filter.
Great that you have an original carb and even better that it appears to be untouched.
I've had www.custom rebuiltcarbs.com, that are in New Jersey rebuilt a Q-Jet from a PC that I was working on with good results. Custom Rebuilt does great stuff, like repair the primary side of the throttle shaft, by inserting bushings to eliminate wear that occurs over 28 years of use. They bench test all their work assuring that it functions properly, before sending back to it's owner.
Think that your fuel spilling was because the needle valve was stuck open, by debris that somehow made it pass the filter.
