holley billet metering block and emulsion jet question
#2463441
03/08/18 11:51 PM
03/08/18 11:51 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
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Mt. Vernon, Ohio
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long story short, taking my 8082 2 circuit dommy back apart from when it was switched over to E-85 in a futile attempt to run corn squeezin"s and back to 110 octane racing fuel,, I aquired a set of billet metering blocks but not sure what size emulsion jets I need and in how many ports, the blocks have 4 emulsion ports and one has a plug and the rest have none, per side,,I have no Idea where to start for size and placemen as I under stand the emultions set the fuel curve thru out the rpm curve and I definately don't want to be too lean, this is for a drag car only, 512 cubes 12.3 compression, 690 lift cam, 272 duration@50.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: holley billet metering block and emulsion jet question
[Re: dartman366]
#2463594
03/09/18 09:49 AM
03/09/18 09:49 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
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Posts: 4,243
Charlotte, North Carolina
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If the metering blocks were designed as E85 specific, you might need some other changes, too. There is a lot more to metering blocks than just emulsion. Check with Dom.
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Re: holley billet metering block and emulsion jet question
[Re: dartman366]
#2463720
03/09/18 02:06 PM
03/09/18 02:06 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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... I aquired a set of billet metering blocks... have 4 emulsion ports and one has a plug and the rest have none, per side...
Sounds like QFT/Proform 4-emulsion blocks (same thing except the anodized color). As an FYI, I've cut-n-pasted something about those blocks that I posted recently on another forum: "I've had 2 sets of the QFT/Proform 4-emulsion billet blocks and their emulsion orifice sizing has been all over the place. The specs I found indicated the as-drilled e-holes are supposed to be .028", and they say to open up the pre-drilled hole to about .050" if you're going to convert to screw-in jets.
The first set ranged from .024" to .028", so I equalized them all to .028". The second set was just under .027" on one block and just over .029" on the other. For that set I simply opened the undersized holes to .029" and figured I'd drill 'em all bigger if I decide to change sizes in the future. The siphon breaks were different between the two blocks, too. The other thing to check are the sizes of the pre-drilled IFRs & PVCRs, which I've also found to vary quite a bit from what advertised specs I can find.
I still think that the QFT & Proform parts are drilled by blind monkeys given how poorly they're done and how inconsistent their sizes can be, too. "Quality Control"... what's that?"
Definitely give 'em the before just pluggin' holes and slapping them on. Are you aware of any other mods that were done to the 8082 as part of the E85 conversion? IIRC, those mods often include changing the sizes of the booster passages to support the additional fuel required for an alcohol tune. That type of thing needs to be "rolled back", if so.
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Re: holley billet metering block and emulsion jet question
[Re: mopar dave]
#2463942
03/09/18 08:01 PM
03/09/18 08:01 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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Very informative. Thanks for the linc. Also, you will need a wide band while tuning those emultions. Your welcome. And I agree that logging with a wideband will show if the AFR is staying flat at WOT and the effects of changing air bleed or e-holes until it is. Jmarkaudio's suggestion in that thread seems to be a good systematic way of approaching the e-hole sizing.
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Re: holley billet metering block and emulsion jet question
[Re: Mattax]
#2463964
03/09/18 08:26 PM
03/09/18 08:26 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Thanks guys this is a start, I intend on giving Dom a call but seen on facebook where he is/was down sick and didn't want to call him yet,,but I will, so I decided to post here and see what you guy's have to say about it,,,to my knowledge there is nothing left of anything E-85 I have already replaced the boosters and stakes and polished the throats of the main bores and took some roughness out of them, I have also pinned all the orfices and have numbers,,Idle feed restriction in main body is .098 or #40 drill,,high speed enrichment or PVCR's are .055 or #54 drill emulsions are all open except for a plug in the second one up from the bottom,, idle feed restriction in the block's are.033 or #66 drill,,booster stakes are .168 or # 18 drill, I now have pretty much everything to put this carb together and the only thing I need to do is run a tap in all the threaded holes to make sure it will screw together oh yeah I bought twenty blank jets so to drill them to the size needed,, keep it coming. P.S. I do have a Innovate LM-2 and intend to get a second O2 sensor and use it heavily and have the program in my laptop so I can read it and save the charts for comparison.
Last edited by dartman366; 03/09/18 08:30 PM.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: holley billet metering block and emulsion jet question
[Re: dartman366]
#2464150
03/10/18 02:47 AM
03/10/18 02:47 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
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State of confusion
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Call me anytime.............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: holley billet metering block and emulsion jet question
[Re: dartman366]
#2464180
03/10/18 07:29 AM
03/10/18 07:29 AM
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Joined: Jul 2007
Posts: 732 eastern,Ky
70RT Charger
super stock
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super stock
Joined: Jul 2007
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eastern,Ky
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Andy’s comments sound pretty insulting to me and were geared toward Dom I thought.
Last edited by 70RT Charger; 03/10/18 07:31 AM.
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Re: holley billet metering block and emulsion jet question
[Re: 70RT Charger]
#2464207
03/10/18 10:44 AM
03/10/18 10:44 AM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
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Tulsa OK
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Andy’s comments sound pretty insulting to me and were geared toward Dom I thought. Oh come on, the last thing someone like Andy is going to do is want to stir up some Carb Drama. He didn't direct it at anyone he just stated his opinion. It is easy to find 10 different opinions on emulsion, which makes it easy to believe no one really understands it. I sure as heck don't lol.
68 Barracuda Formula S 340
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Re: holley billet metering block and emulsion jet question
[Re: 70RT Charger]
#2464226
03/10/18 11:53 AM
03/10/18 11:53 AM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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Andy’s comments sound pretty insulting to me and were geared toward Dom I thought. Unfortunately have to agree. Andy can say for himself what he intended, but it certainly came across just as Dom said. And just as Dom wrote, it slapped a bunch of guys that Dom and Andy know well. Anyone who pokes around at that link I posted above will figure out who Dom was refering to. .... It is easy to find 10 different opinions on emulsion, which makes it easy to believe no one really understands it. I sure as heck don't lol. Sure there are lots of opinions, but that doesn't mean no one really understands. It may mean there are a bunch of people willing to spout off as if they know something, whether or not they understand the principles. The people Dom refers to have spent the time and effort to learn the principles which are based in fluid dynamics, physics, and lots of engineering study. It's in NACA and similar research papers, along with the classic books on carburation and combustion engines by guys like Obert, Larew, Taylor. Many of these guys Dom refers to have been pretty helpful in sharing the sources and helping the rest of us understand this stuff enough to use practicaly.
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