rumblefish360
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I am Soooooo listening!Anyone know how to increase the CFM on Edelbrock Carbs?
- Thread starter SUPERSTOCKRACER
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I am Soooooo listening!
SUPERSTOCKRACER
Well-Known Member
My Dale Cubic Edelbrocks just arrived today. What I see different is the adjustable air bleed which I was aware of and the extremely large bore underneath and butterflys to match. These are the AVS style 1812 not AFB 1412
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Photos ?
I'd like to see the changes/mods & the whole carbs for that matter
yeah the adjustable air bleed will help with jetting issues a smaller air bleed will fatten it up
or a bigger air bleed will lean her out more with out changing metering rods {works opposite of jetting}
I hope they work out well for you
I must admit
I'm not a big fan of Carter or Edelbrock Carb guy at all, never really have been either...
I know there's some that love them, they do relatively well, in multi carb applications too
lewtot184
Well-Known Member
get some pics of those air bleeds. i'm thinking there are 2 idle bleeds and 1 main metering. i'm not certain the bleeds are as big a deal as the throttle bores and venturii. the bleeds do nothing for air but will allow for adjusting the fuel curve. also look to see if there are mods to the main metering passages and the emulsion tubes.
SUPERSTOCKRACER
Well-Known Member
The air bleeds are now under the top plate and it looks like brass set screws drilled.
The venturis look like they have been gone over As the finish looks more of a dull look.
I haven't gone inside yet for the metering jets and the metering rods so I haven't seen anything as of yet.
Pics soon. I do like that these are dual inlets like my other ones but as of now 1 side is plugged.
The venturis look like they have been gone over As the finish looks more of a dull look.
I haven't gone inside yet for the metering jets and the metering rods so I haven't seen anything as of yet.
Pics soon. I do like that these are dual inlets like my other ones but as of now 1 side is plugged.
lewtot184
Well-Known Member
in my opinion, duel inlets in these carbs mean nothing. the fuel inlet passage in the carbs that connects the needle and seats is the same size as 3/8" tubing. so what do you get by installing another 3/8" tube or -6 line? nothing. people don't understand the reason or evolution for duel inlets; which are a holley problem/thing. anyhow, if your more comfortable with it then do it; it surely doesn't hurt anything.
SUPERSTOCKRACER
Well-Known Member
Ok I tore into the new Dale Cubic Carbs and got pics of them. I had to rejet them As they were 101 in the secondary's and .113 in the primary. It has orange metering springs and 6847 metering rods which I left in to try but I usually run 7147.
Also Dale Cubic removed the air mixture springs and put in locking nuts to prevent damage from the very thin walls where the air mixture screws thread into. He said if I blow threw the casting, the carb will be junk.
I had to cut off the GM linage so it will fit on top of the tunnel ram intake.
- - - Updated - - -
Check out the massive bore size underneath and the custom made butterflys & the locking nuts sans springs on the air mixture screws.
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Endangered Species
Well-Known Member
Nice!!!
Post a picture of the regular Eddys you've been running. I want to see the difference.
Post a picture of the regular Eddys you've been running. I want to see the difference.
SUPERSTOCKRACER
Well-Known Member
SUPERSTOCKRACER
Well-Known Member
lewtot184
Well-Known Member
larger throttle bores/streamlined shafts, opened up venturi, and what looks like holley air bleeds. looks like the primary main bleed tubes are gone. there's another idle air bleed on the side of the primary clusters; was that changed? get the calipers out and measure the throttle bores and venturii.
Why would you rejet Carbs that Dale set-up with out testing them first? I'm assuming he has a good idea where they should be.
Doug
Doug
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SUPERSTOCKRACER
Well-Known Member
Dale did NOT set these carbs up for my motor and I believe he just kept the stock jetting in there.
going with .101 jets will torch my motor.
.113 on the primary might be close and safe but I'll check my A/F on my 1st pass and go from there. I know I'd rather be rich than lean. I know what my motor likes. Possibly I might end up .113 square for peak power.
lewtot184
Well-Known Member
.113 jet, 68x47 rod primaries, .107 secondaries; OOTB jetting.
SUPERSTOCKRACER
Well-Known Member
lewtot184
Well-Known Member
something to look at before you get jet happy. compare air bleed sizes between old and new, especially the high speed.
SUPERSTOCKRACER
Well-Known Member
lewtot184
Well-Known Member
the size of the air bleed influences when and how intense the main metering fuel curve will be. a large bleed will create a weaker signal and small bleed a stronger signal. jetting may not want to be the same if the bleeds are different. i kinda thought your jetting was a little big. several things can influence that, but what if the original bleeds were too big and you had to try and compensate for it with larger jets? i can't say specifically what to do other than measure everything and make comparisons.
SUPERSTOCKRACER
Well-Known Member
Kevin, here are the 2 for comparison .OOTB Edelbrock and the Dale Cubic Edelbrock
- - - Updated - - -
I need a buy a set of needle drill bits to measure the air bleeds. I was at grainger and forgot to get them.
i'd rather be a little fat for 1st test hit then lean.
i'm going to need a baseline so i'm going with what I know worked for me in the past. The new motor is a 604 CI Hemi with 513 CFM Stage V heads @.900 lift with a .840 solid roller cam and I know for a fact that I didn't have enough carb to get maximum results.
The way they are set up there is a good chnce that I might need .113 square like my other Hemi but this one is a lot bigger.
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