Help any input will be welcome

Jeff Lee · 03-02-2013, 07:17 PM

I think anytime we have to run a carb such as a 4GC and Autolites, and whatever else, when having problems like this it's probably going to save a few grey hairs to bolt a tried & true Holley double pumper of the same CFM rating on it just to see what happens. If it picks up considerably, then you know where to look. If not, then you know your required carb is good and you ned to look somewhere else.

Maverick · 03-02-2013, 08:08 PM

One item that I have done to get the low end torque up when you let out the clutch. I don't run a spacer under the carb any more. Worked on a issue of pulling the motor down after the clutch release, and at the time, I had a one inch spacer, put a two inch spacer on it, and it was worse. Tried a half inch spacer and it got better, then finally ran no spacer. I changed the jetting a little when the spacer changes took place. One thing I noticed was, I had to jet it down when I had no spacer. Racers wll testify, that it will make more power with the spacer, but it is a drive ability issue. A friend of mine that racers super stock with a clutch was having a problem with bogging when leaving the line. Had a two inch spacer. I told him what I did. He didn't believe me. But he tried it. And now he doesn't run a spacer. If you had a convertor it would be a different issue.

Maverick · 03-02-2013, 08:41 PM

Got a couple of questions, what kind of clutch do you have and how much does the complete assembly weigh? Flywheel, pressure plate, and disc. And how big off a tire do you run? 8600 is extreme to me on the launch, but for a super stocker it might be the norm. I believe that most stick cars like to spin the tire a little on the launch. I sure stick guys can chime in and say if there cars spin a half turn or so on the line. I am a dead hook guy on the starting line, and if my cars spins the tire a little it doesn't pull the motor down as far and the car will run fast. But I don't run super stock or stock. But I do race a clutch car. You might need a little bit more total weight on you clutch assembly, to get the tire moving.

killintime6968 · 03-03-2013, 02:15 PM

Sounds to me like it maybe running/starving for fuel under high load/launch conditions. Fuel volume may not be high enough on launch. It would then be ok in 2nd or higher gears because the demand would not be as much.

55 Chevy · 03-04-2013, 12:27 PM

I believe that the 4GC like the WCFB needs to be tipped forward so it does not starve it on launch. Not sure if that is done on yours but just a thought.

tony5022 · 03-04-2013, 05:25 PM

Not sure if this is the same on a wide tire car but on my 9" tire if we do not have enough air pressure and the front end is loose we hit the tire so hard when I let the clutch out it kills the wheel speed and bogs the motor bad. We had a few still shots taken of the car and the tire was down to the rim then rolled over itself. My holley combo overcame that pretty fast but my WCFB will die until 2nd gear then run great. Just a thought.

03-02-2013, 07:17 PM	#1
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Help any input will be welcome I think anytime we have to run a carb such as a 4GC and Autolites, and whatever else, when having problems like this it's probably going to save a few grey hairs to bolt a tried & true Holley double pumper of the same CFM rating on it just to see what happens. If it picks up considerably, then you know where to look. If not, then you know your required carb is good and you ned to look somewhere else. __________________ Jeff Lee 7494 D/S '70 AMX

03-02-2013, 08:08 PM	#2
Maverick Member Join Date: Dec 2010 Posts: 299 Likes: 3 Liked 36 Times in 26 Posts	Re: Help any input will be welcome One item that I have done to get the low end torque up when you let out the clutch. I don't run a spacer under the carb any more. Worked on a issue of pulling the motor down after the clutch release, and at the time, I had a one inch spacer, put a two inch spacer on it, and it was worse. Tried a half inch spacer and it got better, then finally ran no spacer. I changed the jetting a little when the spacer changes took place. One thing I noticed was, I had to jet it down when I had no spacer. Racers wll testify, that it will make more power with the spacer, but it is a drive ability issue. A friend of mine that racers super stock with a clutch was having a problem with bogging when leaving the line. Had a two inch spacer. I told him what I did. He didn't believe me. But he tried it. And now he doesn't run a spacer. If you had a convertor it would be a different issue.

03-02-2013, 08:41 PM	#3
Maverick Member Join Date: Dec 2010 Posts: 299 Likes: 3 Liked 36 Times in 26 Posts	Re: Help any input will be welcome Got a couple of questions, what kind of clutch do you have and how much does the complete assembly weigh? Flywheel, pressure plate, and disc. And how big off a tire do you run? 8600 is extreme to me on the launch, but for a super stocker it might be the norm. I believe that most stick cars like to spin the tire a little on the launch. I sure stick guys can chime in and say if there cars spin a half turn or so on the line. I am a dead hook guy on the starting line, and if my cars spins the tire a little it doesn't pull the motor down as far and the car will run fast. But I don't run super stock or stock. But I do race a clutch car. You might need a little bit more total weight on you clutch assembly, to get the tire moving.

03-03-2013, 02:15 PM	#4
killintime6968 Member Join Date: Oct 2009 Location: Whitecourt,Alberta,Canada Posts: 236 Likes: 4,650 Liked 91 Times in 29 Posts	Re: Help any input will be welcome Sounds to me like it maybe running/starving for fuel under high load/launch conditions. Fuel volume may not be high enough on launch. It would then be ok in 2nd or higher gears because the demand would not be as much.

03-04-2013, 12:27 PM	#5
55 Chevy Member Join Date: Feb 2008 Location: Calgary,Alberta area Posts: 229 Likes: 23 Liked 20 Times in 15 Posts	Re: Help any input will be welcome I believe that the 4GC like the WCFB needs to be tipped forward so it does not starve it on launch. Not sure if that is done on yours but just a thought.

03-04-2013, 05:25 PM	#6
tony5022 Junior Member Join Date: Dec 2005 Posts: 29 Likes: 8 Liked 10 Times in 2 Posts	Re: Help any input will be welcome Not sure if this is the same on a wide tire car but on my 9" tire if we do not have enough air pressure and the front end is loose we hit the tire so hard when I let the clutch out it kills the wheel speed and bogs the motor bad. We had a few still shots taken of the car and the tire was down to the rim then rolled over itself. My holley combo overcame that pretty fast but my WCFB will die until 2nd gear then run great. Just a thought.