The idle A/F ratio was way too rich
(13:1), even with the idle mixture screws
only three-quarters out from the seat.
We took advantage of the removable
idle air bleeds on the Brawler by
increasing the primary idle air bleeds
from 73s to 79s. The secondary idle air
bleeds were increased from 73s to 80s.
The idle A/F ratio was adjusted to 14.4:1,
with the idle mixture screws a turn and
a half off their seat. The stoichiometric
A/F ratio for E10 87-octane fuel is
approximately 14.08:1, which means the
air bleeds leaned out the A/F very well.
The 273 sounded great at idle, and with
the lean mixture, the rich exhaust odor
was gone.
During the initial WOT runs, there was
a bog when the secondaries opened. We
did several high-gear pulls and adjusted
the vacuum secondaries. After each pull
with a hesitation, we rotated the vacuum
secondary screw in one-eighth of a turn
until the bog was gone. Once we were
bog-free in high gear, we tested the sec-
ondaries in First and Second gear, and
just like high gear, there was no hesita-
tion upon the acceleration.
To cover up a slightly lean A/F ratio at
the initial WOT, we swapped the 0.026-
inch accelerator-pump discharge nozzle
to a 0.030-inch nozzle. The nozzles are
the same style used by all Holley carbu-
retors, and they are swapped in the
same fashion as any Holley. Our
Brawler had the accelerator-pump
discharge nozzle only on the primary
side of the carburetor.
Not for use with a motor vehicle pollution control device or system.
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