Join Date: Feb 2004
Thanked 0 Times in 0 Posts
Re: Q-jets how to make them work etc.
The reason they ran such a large carb on smaller engines is the way the secondaries work. A q-jet has fairly small primaries so its not To much carb for small engines just driving around. The secondaries are kinda like 4bbl on demand system. They open as the engine load/rpm demands more performance.(thats how they are supposed to work thats why they arent a real popular performance carb) For instance if you had a stock 4bbl on with no air cleaner and your hood off and watched the top of the carb when you stepped down on it. the secondary butterflys on the bottom are all the way open but as engine rpms increase the airdam on top starts opening as it opens the secondary metering rods increase the ammount of fuel. In most cases you would never see the air dam on top kick all the way open which would equal 895cfm. Now if you disable this system when you step on the gas you get 895 cfm when you want it NOt when it thinks you need it. I will download the pics and post more info tonight when i get home from work.