General Category > Quadrajet Carb Talk and Tips

S.B.Chevy Q-Jet base plate & intake modifacations for Gas Mileage?

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AHotRod:
I do run a 190* thermostate in it now, and yes, it's almost unbelievable that the gas mileage is this bad. I Only have a 10-1/2 gallon tank, so I have to buy gas every night on my way home. Today it rained all day long ( yes, I drive it EVERY day) and driving a fenderless car helps keep folks from tail-gating  ;)
Todays gas mileage was a womping 12.02 MPG  :(

As to my ignition curve, it's at 20* before TDC @ idle and 33* total @ 1600 rpm at this moment. I've been moving it each 2 days, it's been from 32* - 36* so far with just a minor difference so far.

Glenn

AHotRod:
Cliff,
Based on the information that I gave, should I follow recipe #1 on this carb for daily driving?

Glenn

Cliff Ruggles:
I'd use the second recipe for idle fuel with that much cam in a 9 to 1 350 cid engine.

You talked about timing, how much vacuum advance is being added?.....Cliff

AHotRod:
Cliff,
I have no vacuum advance, only mechanical advance.
What do you recommend?
I can set it up with vacuum......

Glenn

omaha:
Well, you gotta have a vacuum advance for the street use [jus my opinion].
It should have a ported source on the carb [hopefully]. And always run a ported source for street use.
This will get you the best milage. I'll bet you pick up 5 mpg with a vacuum advance. Id say; 16 degrees initial and 34-36 total mechanical and 10 degrees in the vac advance that starts in at 13 inches off of a ported source. these are all general figures to start at.  the one I am not too sure about is the 13 inches starting point of the advance can. I am not sure what such a light car would want as far as the "cut in" point of tha vacuum advance. Is there room for an HEI?

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