Jamesbo

69 442 400 ci, auto, air, q-jet w/ Divorce choke

Is the [I think it's called] "pull off vacuum" [ or vacuum brake] on the passanger side of the front of a Q-jet purppose to prevent the secondaries from fulley opening up at WOT so the engine can "catch up" and won't bog down? Or a smoother "kick in?

442Harv

I always thought it was made so you cannot open the secondaries, if the choke is still on? Motor need to warm up first, before you floor it.

sethj78

Choke pull off is what its called I think. What r u trying to do?? Adjust the secondaries?? They only open when the motor sucks them open if adjusted right.

J-(Chicago)

The vacuum pod attached to the secondaries by that rod prevents the secondary air dams from flapping or bouncing during throttling.

I removed mine and haven't had a problem with flapping, but rumor has it, you pick up a better 60' time if you keep it on, and have the vacuum inlet/outlet size calibrated to your motor.

J-(Chicago)

Correct.



At wide open throttle they are open, but if you immediately let off the gas, the return spring snaps them shut right away.
The vacuum pod helps gradually let the flaps down.

Jamesbo

Gotcha

Thanks