Does staggered jetting a Holley Carb really work?

[dieselgeek]

Re: Does staggered jetting a Holley Carb really work?

Ray Barton shared with us bangshifters that on his dual quad superstock engines, to achieve cylinder-to-cylinder AFR balance it was common to have a spread of 15 jet sizes or more, between smallest and largest.

in tuning that pro stock Hemi with the FAST XFI system, we learned that there was as much as a THIRTY FIVE PERCENT spread in fuel demand between individual cylinders. We had cylinders in the 10s AFR, and also in the 15s...!!! but on a single O2 sensor it showed a "happy 12.5:1 average"


From my limited, amateur experiences: the more aggressive your cam profile and build, the more you need to observe AFRs in each cylinder.

Re: Does staggered jetting a Holley Carb really work?

now go back and test a 8 barrel intake with webers on top of each port and tune it.. per cyl.

or even a tri power set up. bet they make the single holley look silly, a/r across the board

[Barry Donovan]

Re: Does staggered jetting a Holley Carb really work?

good read. learned something.

if the msd programmable can be altered per cylinder...

brut of real draft and less gadgets in modern day can still be a win.

[CDMBill]

Re: Does staggered jetting a Holley Carb really work?

It seems like this kind of change would be even greater on an engine with equally spaced ports and a single carb like a converted LS or a Ford. Stock Eliminator guys would would kill for 5 horse across the power band at 500 HP.

[cjforumadmin]

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