Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Rich 10:1 on primary circuit
1983zsled:
OK excellent! Thanks for your advice!
Sorry.... my bad on the last post, it didn't come out the way it should have. So much for English Grade 12.
I should have said," will the .036 tip M rods .050 or .052 put my metering area close?
I do have some larger jets, that I can use if the 50M or 52M rods get me in the ball park.
Thx.
TommyK:
http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-jets-rods-hangers-quadrajet-primary-rods-50m-quadrajet-dualjet-primary-metering-rods-050036-tip-later-style-p-197.html
1983zsled:
Thanks Tommy K.
I ordered two sets...50M and 52M
I will update the post when I get them installed in about 7 to 10 days when I get them.
:)
1983zsled:
Update......
I Managed to get my hands on some 55M primary rods with the .036 tip.
I dropped a set of .076 jets in with these rods and tested tonight with the secondaries locked out.
Good news on the primary side at WOT it is now 12.8 to 13.4 to 1.
Unlocked the secondaries with a H hangar and DP rods I was 10.8 to 11.4 to 1 WOT.
Another change to CH secondary rods H hangar and I'm now 12.5 to 1 at WOT.
Do you think I can go to a different hangar to get closer to 13 to 1 or should I just bend the H hangar down a little?
Overall this is good news. The idle is fine, and cruise A/F is pretty good. At highway speed turning 2000 rpm's its around 15:1. I do see a real lean spike when slow speed and in Overdrive and I give it just a little pedal ....17.5 to 1 at its highest but no lurching or bucking... This is low RPM 1200 to 1500 and basically just touching the pedal. If I give just a hair more it richens up to normal levels.
Those M rods sure made a difference.
Thanks Guys.
Shark Racer:
Personally I'd leave it at 12.5, it'll give you a margin of safety. It may make more power there, it may make more power at 13. Only way to know for sure is on a dyno, and I'm not convinced it'd be worth a whole lot of power. (Are you building a max effort car?)
Are you saying in O/D it cruises along at 15:1 and then leans out to 17.5:1 when you lean on the pedal?
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