Quadrajet Primary CFM?

[davez26]

Attention trivia junkies!!!I was playing with some numbers, and I've been using 360 as the CFM for a Moto 2150. I'm pretty sure that is somewhere near correct. I know that CFM on a Quadrajet can be 750 or 800. I can't find my notes for the CFM of just the Primary side of a Quadrajet. There is a reason that I ask this, so does anybody know what the CFM of the primary side of a Quadrajet is? TIA

[Snakeyes_Tx]

Q-jets are 750 cfm.. the Edelbrock one is 795.

[TimB]

Rochester made both 750 and 795 cfm versions of the Q-jet. Edelbrock bought the tooling rights from Rochester and also makes both 750 and 795 cfm versions. I run the 795 cfm Edelbrock Q-jet #1904 on both my Buick powered V-6 & V-8 Jeeps. They work great when properly set up. I've never seen a cfm rating for the primary side, but I'd wager it's less than the Motorcraft 2 bbl.

[Bob Barry]

I'd guess it's in the 260-275cfm range, but it's hard to compare to the 2150 because 2-bbls are measured at different vacuum-drops than 4-bbls. Those primaries ARE much smaller than the 2150's, though, and the air-door on the secondaries will only flow what the engine can use (as long as the tension spring is properly adjusted).

[jeepbob]

Actually Edelbrock buys the carbs from Webber, who got the tooling when they bought out the bankrupt Carter, who used to build some Q jets for GM. There are both Carter and Rochester Q jets out in the world and they do not take the same rebuild kits. There was prolly some licensing involved in allow Edelbrock to market them as Q/jets.