I bought this edelbrock 1406 carb in a 350 chevy camaro, and i need some help adjusting. ive got the idle mixutres set good and i tell by the exhuast. 1 1/2 turns, but when i step on the gas it seems like there is all this power then it goes away then slowly climbs to to 100 km or 60mph then you can hear the vaccum secondaries open and then the car has good power and it's gone. Its just 0-100 it slow. like 14sec. Some stuff is edelbrock like the Torker manifold, valve covers, and air cleaner..... do i need to change the metering rods or springs

any suggestions thanks

 

0-100 what in 14 seconds?

 

0-100 kph, or 0-60 mph same thing

 

Duh, I see that now.

What distributor are you using? How is the fuel being pumped up to the carb?

 

I just have the original delco remy vaccum advance distrubuter on the camaro. The fuel is just being pumped by the original mechanical fuel pump. I was'nt sure which vaccum advance to use ( portord or full ) so i just hooked it too the ported advance. The ported port on the carb at idle had no vacuum until the throttle was allpied but the full well had full. Maybe the vaccum advance is incorrect? And also when do the secondaries using start opening in mph. Maybe adjust the step spring. Otherwise the idle mixture is set perfect and runs great at 1/1/2, eveything else is still set to factory on the 1406 edelbrock.

thanks

It's also an auto transmission, shifting from 1st to 2nd to drive i can get 10 sec from 0-60 mph.

 

Is this a Canadian car?

Vacuum advance isn't a factor in power/acceleration conditions. It should be dropping back to zero advance (that portion contributed by the vacuum advance, that is).

The timing should be set with the vacuum disconnected. In theory, it isn't operative if connected to the timed or ported vacuum source, but it's best to disconnect it, anyway. If it is set properly and the mechanical advance is working properly, that shouldn't be your problem.

It sounds as though the secondaries aren't quite right. Either the mixture (rods and/or jets), or it's just opening too soon. However, it could be the fuel bowl is running out of fuel.

Kind of hard to say without experiencing exactly what it's doing.

 

okay yes it's a canadian car. I bought from a guy here. If it the secondaries there is a chart in the book showing which rod and jet combos to use to either enrich or to lean out the secondaries and it also talks about step up springs. Maybe change to heavier ot lighter spring or leaner or richer rod?
Just don't know where to start.

http://www.edelbrock.com/automotive/eps_1406.html


Thanks again

 

I'm not Performer expert, so perhaps someone who is can chime in.

In the meantime, you might want to rig up a fuel pressure gage so you can watch what's happening with fuel pressure during this event.

 

I swapped out the step up springs and it gain about a second, and it does'nt bog anymore off the line, it just keeps pulling, so it is better, goes about 13sec if I start in drive. it's better if i start in 1st, but slow in drive. (automatic ) What other adjustments on the carb should I look at or other adjustments that other people have treid and helped. Also I have a Torker I manifold so maybe it only produces better torgue in the higher rpms, maybe that's why it lacks a bit in the low rpm's.

thanks

 

If it has a 700r4 it sound like the TV cable is not right.

 

okay I know some stuff about cars but now I understand what you mean, I'm still learning in mechanics class in school grade 12. I was looking on the internet about what you said, and it said that if the tv cable is inccorect it will have a harsh shift, and mine has started doing that lately. So maybe my tranny has been screwing up casing me to lag in acceleration?

Thanks

 

actually pretty dumb but when that new carb was installed the throttle linkage was installed but the Tv tranny linkage was not. It's just laying there not connected. That will explain everything now why it shifted rough and it sucks for accelleration.

Thanks for the help

 

If it is a 700r4 and not connected you are headed for certain doom as it controls the pressure inside the transmission. Without it the transmission will slip and toast itself . Get that thing connected ASAP.

 

yah i got it connected and the proper tension, and now it runs great. Shifts really smooth, and it even runs 5 secs faster 0-60 than it did before. Thanks FAST355, if you did'nt mentioned the cable I might have never checked that, and still would have been tuning the carb still trying to make the car go faster when it was a cable controlling the tranny.