CFM & MPG Carburetor myths.....

Removing the “Track” from the discussion for the moment, 318WR’s mention between the mechanical and vacuum secondary gas mileage issue was stated as zero which I agree with but his fast talking was almost a blurring blaze past the important part of the why.

IMO, a quick mention that the vacuum secondary can be set to open sooner or later is missing with the vacuum secondary coming in slower and smoother with less fuel used vs the DP which also has squirters that add fuel in that the vacuum secondary doesn’t is just that little edge in fuel savings/consumption.

Also the old “Your gonna drown the engine with that big carb” should also state that netting the carb properly is key. I’ve been told a zillion times I’ll drown my engine with that carb. I normally LOL & ask how long it will take to ruin the engine with my reply being, well, I’m XX years over due for that!
LMAO

The only time I have had trouble getting a large carb to work on a small smog engine is when there is ether no tuning jets or the rest of the system is in deep need to be adjusted.

As far as a TQ/QJ goes, the small primary helps throttle response and mileage since it is small, only so much air can go through.