therm quad size
A note on the newer T-Q carb is that the leanburn systems used with the T-Q takes care of spark advance. That means the T-Q dosen't have a port of the vacuum advance for the distributor. Find an earlier T-Q but not the first year of the carb, there metered differently.
LeDawg sez;
Any more carb than required results only in unnecessary de-tuning and jetting to correct a/f ratio to best possible calibration which will still be unattainable as min. jets and alterations are still better suited to hungrier engine.In other words big bog.
Any carb used will need to be tuned. The later year T-Q's will have smaller jets and larger rods for there leaner air fuel mixture needs of the smog years. You'll likely need to rejet the carb for anything your doing. But that is also a wait and see.
I really don't understand his post entirely. A leaner mixture will probably be needed then what the stock jetting offers. How it is unobtainable is beyond me and how it is better suited to a hungrier engine is also beyond me. While it is true that lean is mean, taking your time to set up the carb is what you and everyone needs to do.
In otherwords "BOG" is really how the carb is set up, or how well it is set up.
these carbs were only installed to satisfy necessary new car production requirements to run on specially sanctioned event cars that were altered from their stock versions.youll be much happier and snappier with the appropriately sized bore for your efficiency and r.p.m. requirements
These carbs )T-Q's) were first made as racing carbs making an appearance in 1969. IIRC. Since they were on production cars, they became the only carb possible to run in certain classes of racing where you HAVE to run a stock carb.
The proper sized carb is allways what you'll want to run, however, the T-Q is very flexable in it's applications and will cover a wide verity of applications and engine sizes and engine power requirements.
The squarebore carb will have to be size properly or suffer in performance somewhere. This is where the application of size is soooo important. To big or to small, there could be an issue somewhere.
The T-Q will need none of that but has it's own cave eats due to design of being a spreadbore itself. If you use the small primary version on a hot engine, your leaving alot of driveabilty on the table. Acceleration will be weak and feeling like you need to really lean on the gas pedal. A large bore version on a small and mello engine will also have poor driveabilty and gas mileage. It'll feel muddy down low.
Snappy acceleration is a combo of proper carb size, a well tuned carb and well tuned/timed of the engine at the distributor and cam timing should be where it needs to be. It's the whole package that needs to be right!
