So my mom finally got around to wanting the old Qjet from her 67' Impala SS 327 rebuilt.
So after rebuilding the carb and redoing the timing the engine turns right over without even pumping the pedal and idles like a champ. Holds a solid 16" of vacuum, but has a serious stumble when i try to throttle it up.
After the engines running and warm if you try to get on it hard it sounds like the engine takes a deep breathe and just shuts off quietly, no backfiring hissing or popping. If i throttle it up to about 2000RPM and then open it up it doesn't hesitate at all. While the cars in gear with me on the brakes/ throttle it starts to miss very slightly.
here's the kicker, i thought i was the first person to tear this carb down since it left the plant in 67', not the case. In fact my mother just got this car back from a "shade tree mechanic" because i couldn't make the time to work on her car at the time she was ready to have it fixed. She never told me till after the fact that she payed him 200$ to do a "carb overhaul" what a joke. I knew as soon as i opened it up that somebody had the carb apart before, because it had a composite float instead of brass.
I marked all the a/f mixture screws / idle speed ..ext so i could return them too after i was done rebuilding it. I do this because i assume that most of the time the mixture screws on Qjets will still be on point/ close to what the engine needs. this guy had the A/f mixture screws ONE turn out each so she's probably running pretty lean. I'm heading back out to her house tomm to tune the carb some more, yesterday i ran out of good weather.
any ideas what else could be causing this?
Timings set at 10 degrees, i'm going to triple check my timing again to make sure i didn't overlook anything.
Like i said above, SOLID 16" of vacuum
So after rebuilding the carb and redoing the timing the engine turns right over without even pumping the pedal and idles like a champ. Holds a solid 16" of vacuum, but has a serious stumble when i try to throttle it up.
After the engines running and warm if you try to get on it hard it sounds like the engine takes a deep breathe and just shuts off quietly, no backfiring hissing or popping. If i throttle it up to about 2000RPM and then open it up it doesn't hesitate at all. While the cars in gear with me on the brakes/ throttle it starts to miss very slightly.
here's the kicker, i thought i was the first person to tear this carb down since it left the plant in 67', not the case. In fact my mother just got this car back from a "shade tree mechanic" because i couldn't make the time to work on her car at the time she was ready to have it fixed. She never told me till after the fact that she payed him 200$ to do a "carb overhaul" what a joke. I knew as soon as i opened it up that somebody had the carb apart before, because it had a composite float instead of brass.
I marked all the a/f mixture screws / idle speed ..ext so i could return them too after i was done rebuilding it. I do this because i assume that most of the time the mixture screws on Qjets will still be on point/ close to what the engine needs. this guy had the A/f mixture screws ONE turn out each so she's probably running pretty lean. I'm heading back out to her house tomm to tune the carb some more, yesterday i ran out of good weather.
any ideas what else could be causing this?
Timings set at 10 degrees, i'm going to triple check my timing again to make sure i didn't overlook anything.
Like i said above, SOLID 16" of vacuum
It's cool how smooth these carbs are able to run.
