POLL: Which is your favorite carb(s) of choice?
Their not called Thermo-bogs for nothing..
People who call them "ThermoBogs" or "Thermo-Junk" absolutely do not know how to tune them.
The spreadbore design is not only extremely economical under normal driving conditions, but has a monstrous sewer-pipe capacity when on the secondaries. The beauty of the TQ is that the secondaries will only feed what the engine demands, but unlike a VS Holley, the secondary air valve is actually a
variable venturi which increases vacuum flow across the secondary nozzles the further the door opens. The smaller (1-3/8) primary versions can flow up to 800 cfm and the larger primary (1-1/2) flows up to 850 cfm. Secondary air door is spring tension settable which allows you to tailor-tune resistance to your engine airflow demands. The only excuse for having a "bog" is ignorance on how to tune these babies....and not knowing how tunable they actually are.
Unlike many performance carbs (which are modified street versions), the ThermoQuad was designed first as an off-road/track performance carb, not a street carb with the CS Series carbs (Competition Series) flowing at 1000 cfm. These are rare as hen's teeth these days but the early 340 TQ's can be made to run as well as the CS series with very little tuning and maintain excellent street manners and economy....until you tromp on it.
Actually, I like the "Plastic Fantastic" nickname better.....
Don't get me wrong....I grew up wrenching on and tuning Holleys and love them for their straight-forward no-nonsense approach to tuning, but like all carbs, they have their caveats.
I just don't like when a carb design is looked down upon because of what it's NOT, rather than what it IS. The TQ is worthy of the same interest as the Holleys, Demon or Eddie carbs are and is a hands-down better performer than the AFB or AVS ever were.
Don't write off a potential powerhouse because of some stupid ignoramus nickname.
