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- Organization: Senior, Architecture, Carnegie Mellon, Pittsburgh, PA
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- Newsgroups: rec.autos.antique
- Message-ID: <wfLVMBC00WB_8VzFVS@andrew.cmu.edu>
- Date: Wed, 20 Jan 1993 22:18:37 -0500
- From: J Roland Defilippi <jd1y+@andrew.cmu.edu>
- Subject: General Carb Questions...
- Lines: 24
-
- If I an not mistaken, most engines that came with the bigger carb
- also had improvements elsewhere to handle the increase in horses.
- The Chevy 350 4-bolt 4bbl is a case in point, as is my 67 Moper
- 383 4-bbl, which comes with larger valves in the heads, as well
- as dual exhaust standard. On many engines, the larger carb(s)
- were optional because they reduced drivability at low speeds.
- The 3x2-bble set-ups were prone to bogging if the rpms were not
- high enough.
-
- In general, the more barrels of carburator you have, the more
- accurate the fule metering over a range of rpms. However, the
- economy usually suffered with the increase in performance--
- effectivly a smaller carb will run lean as you reach the limits of
- its capacity, giving less punch at high rpm but better economy.
- The six pack and tri power set-ups were a way around the economy
- problem (a friend's six-pack fury got 17mpg on the highway), but
- most people I know who don't have people looking under their hood
- prefer a good 4-bbl for drivability.
-
- Still, there's nothing like the sound of the barn doors opening
- up on a Carter TQ or Rochester QJ as the secondaries come into
- their own.
-
- --Roland
-