Edelbrock tuning help needed...

[Glennster]

 I've been running the 800 Edelbrock AVS Thunder Series Carb. It showed 460 HP on the dyno and ran fine on the dyno. Now that it's in the car, it seems to run lean or run out of gas after a long period of being wide open. Specifically (416 Cu. In w/ Auto Trans), I run it up to 5,600 / 5,700 rpm's in 1st, shift to second and it falls down as it tries to get back to 5,000 rpm's in 2nd gear.
  I put my buddies 850 Holley on the car and it ran great at high end / wide open for a long time.

 As much as my buddy with the Holley likes to make fun of my Eddy (he says they're junk), I've got to believe that it can be jetted / adjusted to handle this motor.
 Are there any Edelbrock guys out there that can help?
THANKS!!!

[Chryco Psycho]

your buddy is right , Eddy carbs are junk 
sounds to more like there is not enough fuel supply but if it keeps up with the Holley maybe not
there are tuning kits availablkefor the Eddy but I would put a fuel guage on it first , the Holley has bigger fuel bowls so maybe it is a fuel pump problem which can be determined with a fuel guage.
 If you decide to replace the carb I would look at a Proform carb from Mancini racing 

[spitnl]

I agree, it sounds like a fuel pressure problem.

Only thing I can think of is the mesh in the inlet of the Eddy carb being restrictive.
Suggest you take it out and test again.

Cheers,

Frederick

[Glennster]

 I appreciate the help... I also appreciate all of the Holley guys that have held back from giving me the old ''Told you not to buy an Eddy''. I've already got a ton of that locally. Looking back, the Eddy was probably a mistake. But, I'm going to give it a fair chance. I may be wrong, but I believe this thing should get the job done if it's set up right. The real question may be, how much crap do you have to put up with to get it to work?
  The guys that built my motor let me try the 750 Holley that they use when they dyno engines (tried it last week), it was better than the Eddy, but still fell off WAY at the top. It was close!
  The 850 that did work was not a stock 850, this thing had something done to it for drag racing. Maybe this motor is just plain thirty!!!!
  I spoke to 2 guys at Eledbrock tech today. The first guy sucked, the second guy (Art) was fantastic. we'll try what he suggests and go from there.
The first guy said to go to their #1466 ''High Flow Needle Seat'', that was all the help he'd offer. So I called back looking for more help. Art had me adjust the secondary and also asked that I go to their ''PINK'' springs on the metering rods. He gave me his direct line and asked that I have him work with me until it's right.

[Chryco Psycho]

I often use a 10 lb sledge to tune eddy carbs

[Glennster]

I made the adjustment to the secondary, added the high flow seat and needle kit and went to the PINK springs (heavier and longer)...
Same results......  : - (

I wonder if Edelbrock makes a sledge hammer?

Time to call Art, I'm close to buying my buddies 850............

[HP2]

Go here and read their tuning section and see if that provides any insight. There is more than just the step up springs and needle/seat to tuning it. http://www.edelbrock.com/automotive_new/mc/carbs_acc/carbs_access_main.shtml

I've been running a 750 carterbrock on my 360 pushing 425 horses at 6500 rpm and have never had a problem running lean at WOT.

[Glennster]

 Talked to Art, he's going to send me bigger jets and smaller rods for the primary as well as their largest jets for the secondary.....

[quagmire]

I also run a Thunder AVS 800 carb on a 408 stroker.  I am using the Eddy heads, air gap intake, and cam kit.  I run headers with an H-pipe and an MSD ignition to round it out.  Compression is about 9.8:1.  I also have a 3500 stall converter and 3.91 gears.

Every combo is different, but here is how mine is set up.  I have a Carter high flow mech pump regulated to 5.5psi with a dual feed banjo line.  My accelerator pump is at the middle link and I use the .052" nozzle.  Primary jets are .107", metering rods are the 7057's, and I run the orange 5" springs.  Secondary jets are .104" and I loosened the secondary screw 1/4 turn.  I also run the high flow needle and seats.  Float drop is 1.5" and float height is 3/8".  I did drill holes into the throttle plate in order to get it to idle out of the transfer slots.

I have a wideband installed, and it idles at 14.7:1.  WOT is 12.8:1, but my cruise ratios are fat at 13.5:1.  Most acceleration is the same.  WOT is perfect, but it runs out of air at 5500RPM.  I need head work.  This car will not lean out at all in cruise, which is very annoying.  I've tried everything short of drilling the air bleeds.  It's either rich at cruise or too lean under accel.  These carbs are stone reliable because they are simple.  Unfortunately, that also limits their adjustability.  I'd probably pick up some MPG if it would lean out.  Without a wideband you are really just guessing on which direction you need to go.  It may be a worthwhile investment.      Hopefully this helps some.

[Glennster]

 I installed the larger primary jets / metering rods and the larger secondary jets that Edelbrock sent me. I adjusted my floats to 3/8'' and moved the accelerator pump lever to the second hole. I got good results at top end!!!! 
 It looks like this is one very thirsty engine. The plugs look a little lighter than I think they should, I'd like to go to a larger secondary jet, but I think they sent me their biggest one.
 Thanks for the advice!!!

[femtnmax]

I also run a Thunder AVS 800 carb on a 408 stroker.  I am using the Eddy heads, air gap intake, and cam kit.  I run headers with an H-pipe and an MSD ignition to round it out.  Compression is about 9.8:1.  I also have a 3500 stall converter and 3.91 gears.

Every combo is different, but here is how mine is set up.  I have a Carter high flow mech pump regulated to 5.5psi with a dual feed banjo line.  My accelerator pump is at the middle link and I use the .052" nozzle.  Primary jets are .107", metering rods are the 7057's, and I run the orange 5" springs.  Secondary jets are .104" and I loosened the secondary screw 1/4 turn.  I also run the high flow needle and seats.  Float drop is 1.5" and float height is 3/8".  I did drill holes into the throttle plate in order to get it to idle out of the transfer slots.

I have a wideband installed, and it idles at 14.7:1.  WOT is 12.8:1, but my cruise ratios are fat at 13.5:1.  Most acceleration is the same.  WOT is perfect, but it runs out of air at 5500RPM.  I need head work.  This car will not lean out at all in cruise, which is very annoying.  I've tried everything short of drilling the air bleeds.  It's either rich at cruise or too lean under accel.  These carbs are stone reliable because they are simple.  Unfortunately, that also limits their adjustability.  I'd probably pick up some MPG if it would lean out.  Without a wideband you are really just guessing on which direction you need to go.  It may be a worthwhile investment.      Hopefully this helps some.

I liked your write up on tuning your AVS carb.  A couple questions please:
You mentioned a high flow fuel pump, I assume its mechanical. Which carter fuel pump did you use, do you have a part number?
What fuel pressure regulator did you use to obtain the 5.5 psi?  What banjo fitting?
thanks.  Phil

[Glennster]

 I finally figured out how to tune the Edelbrock, this picture should explain it all.......

[Chryco Psycho]

Nice tune up , that is the best carb I have found for the $$ out there
 My bet is it is running better that ever now 

[UKcuda]

I finally figured out how to tune the Edelbrock, this picture should explain it all.......

Very amusing.

Every combo is different, but here is how mine is set up.  I have a Carter high flow mech pump regulated to 5.5psi with a dual feed banjo line.  My accelerator pump is at the middle link and I use the .052" nozzle.  Primary jets are .107", metering rods are the 7057's, and I run the orange 5" springs.  Secondary jets are .104" and I loosened the secondary screw 1/4 turn.  I also run the high flow needle and seats.  Float drop is 1.5" and float height is 3/8".  I did drill holes into the throttle plate in order to get it to idle out of the transfer slots.

I have a wideband installed, and it idles at 14.7:1.  WOT is 12.8:1, but my cruise ratios are fat at 13.5:1.  Most acceleration is the same.  WOT is perfect, but it runs out of air at 5500RPM.  I need head work.  This car will not lean out at all in cruise, which is very annoying.  I've tried everything short of drilling the air bleeds.............

Have you tried 0.104 primaries with 68/52 ?

[quagmire]

I have every jet and metering rod size they make.  Anything up or down in size seems to push one of the other metering modes off.  I played with the last two summers and have gotten it about as good as I can.  I plan on going EFI in the future as opposed to switching to another carb setup.