Quadrajet Problem Solving > Buy Quadrajet Parts, Quadrajet Kits, Service
Post '75 primary rods
scottyp99:
Quick question: i ordered some Q-jet jets from you guys, (74's and 75's) and they look weird. The shoulder (I don't know what else to call it) where the threads meet the top of the jet are not flat, but at an angle. It makes the jet sit too high. Am I missing something here? Thanks,
Scott
Cliff Ruggles:
I check the actual relationship between the metering rods and the jets for every carb we build, and adjust the hanger if/as needed. That's all that really matters in how it works.
Set the hanger arms so at full lift the tips are in the small portion of the jets, and thru the range of adjustment with the APT, they upper section of the metering rods have full travel in the actual jet orifice.
Some carbs aren't even machined at the right depth, so this relationship should be verified on every carb build.....Cliff
scottyp99:
--- Quote from: Cliff Ruggles on June 19, 2011, 06:31:37 AM ---I check the actual relationship between the metering rods and the jets for every carb we build, and adjust the hanger if/as needed. That's all that really matters in how it works.
Set the hanger arms so at full lift the tips are in the small portion of the jets, and thru the range of adjustment with the APT, they upper section of the metering rods have full travel in the actual jet orifice.
Some carbs aren't even machined at the right depth, so this relationship should be verified on every carb build.....Cliff
--- End quote ---
OK, I understand that any mass-produced, assembly line machine work will have some tolerance, and we can take measurements and take up a little slack here and there as far as that goes, but I can't even understand what this phrase means:
they upper section of the metering rods have full travel in the actual jet orifice.
What do you mean by "the actual jet orifice"? A cross section of the jet would have an hour glass shape, do you mean the actual pinched in "waist" of the jet? or is it just another way of saying "as long as the metering rod is not physically blocking off the jet, you're good."? Sorry to seem so dense,
Scott
Cliff Ruggles:
Update. I checked our new shipments of jets over the weekend, and they are not correct in several of the sizes that we ordered.
The 75's, 76's, 77's and 70's were boxed incorrectly.
Scotty, when you get time, send me an email to: cliffshp@embarqmail.com and we'll get the correct jets sent to you....thanks....Cliff
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