How And Why Move Emulsion Jets?

RustyRatRod said

And again there is a "seemingly" modern metering block design and the IFRs are still at the top. I just have many questions. Like, if you move the IFRs to the bottom, do you need to plug the top holes? And WHY do they use "only" one pair of emulsion jets? And would "more" emulsion jets be beneficial? And WHY? And how do you tune for those? What symptoms do you look for to tell you which way to tune the emulsion jets......and on and on. LOL

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Because it’s industry standard now. The IFR MUST have a head over it or idle AFR is horribly unstable.

Just like power valve timing and tuning, it’s been wrong so long they just keep doing it.

As an aside, I installed a new Brawler on a guy I went to HS with today. I said don’t bolt it on until we look at it.

Brawlers were notorious for high IFR’s, massive emulsion and some crazy bleed sizes.

I was more than surprised that this carb (5 days old, fresh out of the box) had an .028 IFR and it was LOW (that’s a bonus for my fat hairy *** as its way less work if I don’t have to move them) AND it had 2 emulsion holes at .028, not like some of them with 4 emulsion holes all wide open and .032 holes.

I didn’t get to do a deep tune on it, but when his BBC goes in I’m going to dyno and tune it.

So maybe Holley got their collective butt out of their *** and made a production change.

If they did that makes the Brawler an even better deal.