Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Secondary Hanger?

(1/2) > >>

Toronado:
Just installed a new choke pull-off,
rate is at 2 seconds. Problem is the secondaries,
I bog out when floored. If I slowly accelerate there is no bog,
only bogs when secondaries first open. I think its lean when
the secondaries first open, should I bend the hanger up, or
get different rods. My spring tension is light on the air flap,
I tried making it tighter but the bog was still there.
It can also make coughing sound as secondaries open.
Is it running rich, or lean when the sec. open & bogs out?
 carb. #7040252

Cliff Ruggles:
The POE system needs to be working correctly to help overcome a lean condition when the secondaries first open.

I would try raising the metering rods as well with a taller hanger or carefully bending the stock one.

The airflaps need to be tuned for smooth transition as well, too fast will almost always cause a lean conditions, bog/hesitation/stumble, etc....Cliff

Toronado:
Thank you, I will try to bend the hanger up carefully, & buy shorter rods.
 Air flap; adjusted spring tighter it did not improve the bog , & at high rpm it closed the
air flap too soon once it ran out of pressure to hold it open.
note: After the initial bog from the sec. the car does accelerate correctly.
I will report my results soon.

Toronado:
POE? Secondary POE Restriction – Air horn:   
0.058” is this correct?
noted choke pull-off is actually 1.5 sec. for complete  extension.

Cliff Ruggles:
The POE system is like an accl pump, it adds fuel to help prevent stumble/hesitation/bog as the huge secondaries first open.  The system is described in our book.

If it's fine after the initial troubles, then look closely at the pull-off, flap spring tension, POE exit hole location, and link up to the secondary airflaps.  The pull-off should hold the flaps tightly shut at idle or high vacuum.

Hanger height and the metering rods play a role here as well.  Some metering rods have a pretty "fat" upper section, and if too deep in the fixed jets can create a lean condition when the secondaries first open.....Cliff

Navigation

[0] Message Index

[#] Next page