Mopar Muscle – October 2019

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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