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 Emulsion change/ Hs Bleed change 
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Joined: Sat Jun 01, 2013 8:02 pm
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Ok so if anyone's has been following my carb stress got new questions,lol...

so i changed my emulsions from .022.5#1, .019#3, .018#5 with a .025 Hs Bleed, and i couldnt get this thing rich enough unless i ran huge jets, alot more then the normal for a 1050 with .990 skirts. So I remember shrinker telling me before that maybe i dont have enough emulsion, so i decided to try it, I went to .028#1, .028#3, .027#5 with a .028 Hs Bleeds, well im plenty rich now, in my logs i put notes in each run, so my question is how do i get the lean part out of the first part of the run? Maybe a smaller hole in #1? Anyway please take a look at my logs, and get me insight for needed changes, i want to run one more time in good air at a good track , and want this right so i can run my 9.99999 lol


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74 Firebird 3620 lbs
10.02@131.96 1.377 60 ft
Sun Oct 16, 2016 7:53 pm
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Could be a fuel supply/control issue under the higher G's at launch? As you can see it settles in nicely after what looks like the shift into high gear. I'm assuming this is a transbrake launch. Looks lean at your stage RPM, actually looks lean at idle rpm. (Over 17 AFR) Then the lean spike when you deck it, followed by a little rich dip, which is pretty normal.


Mon Oct 17, 2016 3:32 pm
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JayCampbell wrote:
Could be a fuel supply/control issue under the higher G's at launch? As you can see it settles in nicely after what looks like the shift into high gear. I'm assuming this is a transbrake launch. Looks lean at your stage RPM, actually looks lean at idle rpm. (Over 17 AFR) Then the lean spike when you deck it, followed by a little rich dip, which is pretty normal.


I have twin holley blacks teed together before one big holley reg, set at 6 psi , with .130 needle n seats, i would be very surprised its fuel, im foot braking using a 2 step, low 1.40 60fts, it idles really well at 16.5-17.0 actually. with the other emulsion and air bleed set up it was rich in the beginning or near flat, just went lean on top and wanted a shitload of jet, this way its rich with a lot less jet, and could even go leaner, but as i do that first part gets leaner too, im thinking a much smaller hole in my #1 emulsion would help it early in the run.

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74 Firebird 3620 lbs
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Mon Oct 17, 2016 6:20 pm
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anyone else have comments? 88 views and one comment lol

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Mon Oct 17, 2016 10:07 pm
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Is your scoop sealed to the carb? Forward facing scoop could be a factor as well. I just don't see emulsion affecting the same rpm range through 1st and second gear, and then doing something different in the same rpm range in 3rd gear. Fallback and peak rpm is basically the same through each gear. If it were sitting still on a dyno, would you expect three pulls in the same rpm band to be the same? The calibration in the carb can't change, so what are the other factors that can, that might affect the mixture? I'm kind of just thinking out loud here....

Do you have a log without the .74 sec smoothing on the afr?


Last edited by JayCampbell on Tue Oct 18, 2016 10:18 am, edited 1 time in total.



Tue Oct 18, 2016 10:01 am
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Yes I have a pan with foam sealing it off, The only thing I changed from last time out to this time is the emulsion sizes, and a bigger HS bleed. and now it reads leaner in 1-2 and richer once in third, I thought a smaller emulsion meant leaner and a bigger HS leaner in top gear, but im seeing the opposite here after going to a bigger emulsion size its now leaner, i thought i read last night and other times the bigger the hole size the harder it will draw early in throttle opening. But I'm already full throttle sitting on 2 step just like before the changes, i thought i seen that from tuners comments on yb on a 4150 thread.

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Tue Oct 18, 2016 10:15 am
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I believe I'd keep emulsion the same, and go to a .031 hsab. You then may need to go up slightly in jet. Maybe tuner and/or Mark will chime in with something.
Very good info/testing you are providing here!

I have much respect for Bob Book, and the few gas carbs I have seen of his are 3 circuit, use holley blocks with I believe 4 emulsions, from bottom .028, x, .028, .028. The last one I had in hand had that emulsion, was a larger bore, 2.19 bore, 1.9x or 2.0? venturi. Still had idle feed tube in the wells, only 92 jets from what I recall, 1" skirts, 12 or 16 hole boosters. I sold it to a friend to run on his 522" SR-20 headed BBC, 15:1 compression. It made over 1000hp, and 50 more hp than his previous heavily worked 2 circuit 1050. They tried richer, and leaner, and ended up with the jets it came with. He has this in a '41? Ford pickup. He ran the Texas mile with it, ran 190+mph standing mile (from a dead stop). He ran drag week, drove the street miles with it, said it WAS somewhat blubbery as you would expect, but never changed spark plugs. He was kicking butt in the Hot Rod class until he thinks he broke a piston ring. He won the Hot Rod class last year with the 1050 on it. I think his best pass this year was 9.39?

I ran this carb untouched on my 496 on the dyno, and it ran very well. Was pretty clean coming up on loading, and ran really well during the pull.

I guess my point is, when I see very good running carbs with very close to the same emulsion configuration, I tend to think there's something to it. Keep us posted as this is very good real world on track data!


Last edited by JayCampbell on Tue Oct 18, 2016 11:21 am, edited 1 time in total.



Tue Oct 18, 2016 10:49 am
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Also begs the question, which change had the most effect? The emulsion or the HSAB.


Tue Oct 18, 2016 11:19 am
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I'm a little confused here. You introduced more emulsion air into the mainwell and made it fatter? Am I reading that correctly?

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Tue Oct 18, 2016 11:26 am
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JHaleyH374 wrote:
I'm a little confused here. You introduced more emulsion air into the mainwell and made it fatter? Am I reading that correctly?


That's exactly what I did, lol... Bigger hole sizes and bigger HS Bleeds, That same jetting I ended with sunday blp 110/112 it was going lean on the top
with the other emulsions and hs bleed setup. Ill show the logs when i get home later today.

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Tue Oct 18, 2016 11:36 am
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