won't lug (1 Viewer)

[rusmannx]

i'm running a quadrajet.

it actally runs better with the DUI then it did before.
the low end problem was that way before the DUI.
actually now that i think about it, the 5 year ago experience was even before i had the engine rebuilt.

i'm beginning to think my carb is junk.
maybe another quadrajet.... this one has lasted almost 30 years.

 

[CruisinGA]

[quote author=rusmannx link=board=1;threadid=4892;start=msg37720#msg37720 date=1062647828]
cruisinGA; will yours lug off the line with no throttle?
i've noticed we have a very similar setup.
[/quote]
Yes, I have the stock unrebuilt Aisin Carb and OEM distributor. unknown miles probably either ~100k or ~200k the odo is broke at 90k and it may have turned over before it broke.

 

[Gumby]

A 350 with a quadra jet might not lug down that low. It is not a tractor motor like the 2F or your buddy's Jeep I-6. Mine lugs only because it is a TBI and the idle compensates when it's about to stall. A cam might help, especially if the motor is out of a car. There are other things you can do to help low end power. Different heads, different intake and carb, etc. Mostly not worth it until that motor goes and you prep a new one.
If it's a 2F with a quadrajunk, then put the right carb on it. The 4 barrel might give you a little more top end, but you will loose on the bottom.
My favorite lugging motor- a Valkyrie 1200 flat 6 will take off from a standing start in 4th gear with no throttle. That's torque to weight ratio. 8)

 

[IDave]

By the way, I don't know about Holly carbs, but the Fuel cutoff solenoid/magnetic switch wire on an AISEN does not go through the firewall, but attaches to the positive terminal on the coil. (Just so no one gets confused here). I checked the engine manual to be sure on that.

 

[Gumby]

Most Holley's dont have an idle cut off. I have never seen a q-jet with one.
Escort motorcrafts did, used to fix a ton of those. I just fixed a Chevy LUV pick up last night that the owner bypassed the fuel pump relay and, in doing so, cut off power to the choke and the idle shut off soliniod. He had the idle mixture screw turned all the way in and the idle speed screw turned so far out the fuel was dripping out the main jets to keep in running. He could not figure out why it didn't idle well. :

 

[rusmannx]

i'm hoping to start trying to adjust some stuff on saturday.
i wish i could figure out where to look on tech for this type of carb.
i don't konw anything about it (other than it doesn' work very well)

here is another brain tickler:
i can clean this carb up so nice you would eat off it, but after a tank of gas it is all yellow and grimey.
something leaks maybe?

 

[hammerhead]

Are you running a Q-jet on an F?

 

[rusmannx]

yeah

 

[hammerhead]

[quote author=Gumby link=board=1;threadid=4892;start=msg37997#msg37997 date=1062716731]
A 350 with a quadra jet might not lug down that low. It is not a tractor motor like the 2F or your buddy's Jeep I-6. Mine lugs only because it is a TBI and the idle compensates when it's about to stall.[/quote]I have a 350 SBCw/Q-jet that lugs like mad.

If it's a 2F with a quadrajunk, then put the right carb on it. The 4 barrel might give you a little more top end, but you will loose on the bottom.

rusmannx - I agree with Gumby, it sounds like to much carb. Sorry about the tech mislead last night. I thought you were stock drivetrain like your sig line says. Do you have the stock carb setup? Could you reinstall?

 

[rusmannx]

i don't;
the quad has been on it since my old man bought the truck back in 75.

 

[Gumby]

[quote author=hammerhead link=board=1;threadid=4892;start=msg38099#msg38099 date=1062739133]
I have a 350 SBCw/Q-jet that lugs like mad.[/quote]

Lots o' different 350s out there. At least in terms of head design, cams, intakes etc.

 

[hammerhead]

Gumby - No kiddin, my last one was a car motor and totally sucked. A friend found me this tow truck 350 and I can't believe the difference. Really chugs.
rusmannx - What else has changed since back when it lugged good. Have you done a compression test?

 

[rusmannx]

besides the neverending residue on the outside of the carb, i'm also getting unburnt fuel (black exause).
this has gone way down since the DUI and i don't have to choke it nearly as much in the cold either.

i'm thinking of getting a rebuild kit for the qjet.
i think something from mid 60's 6cylinder chevy is the right fit.

i also am going to check the gap and see where it is at. DUI says that it should be around .55

 

[hammerhead]

If you haven't done a complete tune-up start there. Clean air filter. Check hot air intake & heat control valve. Spark plugs & wires. Cap & rotor. Points gap & dwell. Timing. Mechanical & vacuum advance units. Adjust valves.
Set idle at 650. Compression test min. 110 lbs.

 

[CruisinGA]

Don't fool with that Holley anymore, get what was meant to be on there in the first place. At the least buy a used carb and rebuild it instead of rebuilding the holley. You may be running too rich if there is unburnt fuel and a lack of bottom end torque.

 

[rockcod]

I'd also look at all vacuum lines and check your timing.

Just a thought.

Tony

 

[rusmannx]

why is that aisen supposed to be so much better than anything else.
i figure anything that can get fuel and air into the engine with some degree of efficiency should be ok.

anyway, i have a friend with a aisen that he said he would sell me, but it needs to be ruibuilt.
how much is it worth, and how much is the rebuild kit?

 

[dylan]

i bought a rebuild kit from local parts store for $40? but a toyota kit is better $$? my kit was 1 size fits all so some parts where a little wierd looking

 

[Degnol]

Russ, You can buy a carb kit from your local NAPA, CarQuest, etc for about $15.00. I bought a couple of CCOT's kits, hoping they were more complete than the local jobbers, but they weren't. Jim Chenoweth has a more complete kit, including a lot of parts that are not normally in the "usual" kits. Like float, jets and some more stuff you may or may not need.
I've only rebuilt the non smog carbs, but the smoggers are not all that different.
You can rebuild a carb!!! I'm a dentist with more interest than expertise and I did it, with good results. Since you are running a Holley, you do not need a manifold. The stock carb will fir right on the stock manifold you already have.
BTW, do you have a rod type linkage or the cable??? I have either type, with fresh rebuilds.
Good luck!
Ed Long

 

[hammerhead]

It's a rochester 2-jet not a holley. Still better off with stock carb. It was designed for the land cruiser. The rochester was set up for a GM.