Mopar AVS Carb. ????
 

Playing with the carb on my 440. it seems to not want idle very well at low RPM, there is no check ball under the pump squirters, will that affect anything. also curious about primary jet size and metering rod, the jet has a 120# and a 497# with a .045 rod

Re: Mopar AVS Carb. ????
 

Jim : I run .113 and .095 Jets on Stocker. .045 on bottom step is OK. The 1968 up cars ran a 3 step metering rod with cupped retainer while 1967 back had 2 step and flat top.....also as I recall a shorter primary jet. If you mix combo up it will run like cr*p. If you are in Vegas, I would be happy to take a peek at your carb or loan you one if you guys promise not to put that male s*x doll in my Demon again. John Irving

Re: Mopar AVS Carb. ????
 

Thanks John,Does that jet # sound like a real # for the jet i can't see it very well it's so small. ONE MORE TIME I DID NOT DO THAT X-Rated Doll thing to you!!!! Mark Faul you will read this at one point??? Time to fess up dude.............ha ha ha

Re: Mopar AVS Carb. ????
 

The AVS doesn't use a check ball inder the plunger. There's an inverted brass needle under the squirter.

Re: Mopar AVS Carb. ????
 

John, this thing has a flat retainer for the rod! and the rod is 3 step that is .045-.070-.080 it just sounds to me that someone tried to peice this carb together and make it work. doesn't supprise me one bit.i have redone this whole car besides the carb. I guess on the possitive side of this i have a good car now......................

Re: Mopar AVS Carb. ????
 

My understanding of the AVS and AFB carbs is that the three-step rods can be used with the AVS primary jets (taller than the AFB jets) and the domed piston/rod covers. The two-step AFB rods use the flat covers and the shorter AFB jets. I haven't tried swapping the two around. I keep with the AVS setup in an AVS and the AFB in the AFB carbs. The trick is finding the AVS parts and jets. The Edelbrock Thunder AVS series seem to use the AFB two-step rods and jets.

Re: Mopar AVS Carb. ????
 

You can run the AFB/Edelbrock perform carb 2 step rod and jet with the FLAT cover in an AVS. But if you use the AVS 3 step cover and 2 step rod and jet it won't run right. The AVS uses a taller jet, longer 3 step rod and the cover with the bump in it. The secondary jets are all the same. The last #'s on the jets are simply the hole size in thousands. If it ends in 95 it's .095 diameter hole in the jet.
I would think it would idle ok unless the primarys are open enough to pull fuel through the primary metering circuit, which may be the case in a low vacuum situation. First check the throttle shafts for play and a possible air leak. If they are ok you may have to drill a 3/32 hole in each primary throttle blade to give it a little more air flow. If it seems better but still dies out make the holes a bit bigger.
I'm sure the guys that know these carbs could tell you which air bleed to open up to pull more fuel/air through the idle circuit.
The AVS is very simple but can be tricky, when right they run very well.

Re: Mopar AVS Carb. ????
 

So to start off with i have the flat covers? i have a Edelbrock carb i removed the rods from it, in witch it had flat covers as well, the car seemed to idle better, it still has a surging idle between 1100-1700 its deffinately in the idle circettry, what a pain...befor it acted like it was running out of fuel and would die, would have to feather the pedal to keep it running i think im past that phase now. just fine tuning i guess...thanks for the info.

Re: Mopar AVS Carb. ????
 

I would try this because it is commonly available... edelbrock .095 short jet with flat plate and 16-76 rod or anything about 67-70 top and 45 bottom. I have 100 plus AVS carbs if you give me part # I probably have unmolested core or if anybody else needs one $100. Like Jack said I would rather not switch junk around but about combination should get you down track. Surge many well be spring on metering rod try stretching it 1/4'or buy Edel. Asst. and use lightest one. I adjust Air Door Tension Tight.

Re: Mopar AVS Carb. ????
 

John, it,s getting closer, but still not perfect, Bushmaker is going to look at it today to see what else we can help on it.. Who or where can i buy a good one built for my combo ready to bolt on.. thanks everyone for all the input....

Re: Mopar AVS Carb. ????
 

Carb i have is junk, has some type of vacum issue internaly, can' find it, changed all we could change carb just don't want to work.... looking for a replacement anyone have a AVS 4737 call 425 941-8765

Re: Mopar AVS Carb. ????
 

There's a big difference in launching a stick car on a two-step vs. launching an auto trans car on the foot brake. I think most would agree it takes more carb tuning skills with the a/t equipped car. This car & carb was built as a 4-speed combo and now it has been changed to an auto trans combo.
That would, of course, require a different carb tune. All I can say is the car used to run in the 11-'teens in Arizona.

Re: Mopar AVS Carb. ????
 

Jeff...Auto/stick whatever this was a peice if sh..t from day 1.. done all i can do it's in the scrap pile it has internal issues. don't get me started on this car, i have rebuilt this car from bumper to bumper. door to door!! who ever!!! put this car together or even worked on it was a true idiot... now it's a safe car and good car.......enough said

Re: Mopar AVS Carb. ????
 

Well we've all seen the "POS" cars that get rebuilt from bumper to bumper by the new owner, yet seem to slow down in the process. It's your baby, nobody elses.
Keep in mind you can run a 4737, 4741, 4738 or 4739 on that 440. There not easy to find and not cheap. I remember it took $250 just to get that particular carb. And there's some good books on the AVS that explains the differences in tuning a two-step rod and a three-step rod. Steve Wann would also be a good source of help here (maybe even a core carb).
Good luck to you.

Re: Mopar AVS Carb. ????
 

Jeff lee are u a bench racer or a drag racer?? u shure now alot about every thing and dont see your AMX at the track racing and for John E the blow up sex doll in your race car was mark F and hal S tommy G payed them to do it to u

Re: Mopar AVS Carb. ????
 

I believe that the part number on carbs in not important anymore .... just in specs for reference. The 440 carb has 1 11/16 primarys/Secondaries and a certain booster/venturi spec. My personal choice is earliest year legal carb (usually) and I like stick carbs for their transitional metering and throttle response on AVS. $100 Bill will buy almost any of my cores! Steve Wann is absolutely best AVS guy in world in my opinion........Pick up an amazing .2 with his carb over anything I have built myself in last 40 years! Rumor has it that people have paid $2500 for one of his top shelf jewels! I will be in Tucson and Vegas if anybody needs help.

Just my .02 John Irving

Re: Mopar AVS Carb. ????
 

Jim and Jeff ...... both you guy are entitled to and are probably justified in your arguments ..... How about if I have the number carb you want-- I will just give it to you for free and save you guys the hassle! I will work with you and try to help you get it working. Life is too short for all this..... take it from me. OK?

John Irving:

Re: Mopar AVS Carb. ????
 

Never said the car was running slow!!!! Just want it better.

Re: Mopar AVS Carb. ????
 

Thanks John,, your write life is to short!! anger management classes just kill me!!! i sent you a PM.. Thanks Jim

Re: Mopar AVS Carb. ????
 

Hey Jim on another note any luck on those 5.00 gears
Best regards,
Mike

Re: Mopar AVS Carb. ????
 

Don O'Malley (has SS/JA 327 'Vette) is another very good source for the Carter 4bbls. I just had him do a pair of Autolites for my AMX. PM me and I'll get you his #. Work was good and delivery was "close enough" to being on time. But when your just a bench racer, who needs something like a carb in a hurry?

Re: Mopar AVS Carb. ????
 

Got it handled, thanks, found 25 of them today from all of the N.W. mopar people, one is already on it's way to be built...who is 283SS he sounds abit uptight???

Re: Mopar AVS Carb. ????
 

Jim you have a PM

Re: Mopar AVS Carb. ????
 

I might possibly still have a couple of old AVSs around, if they are worth anything?


Jeff

Re: Mopar AVS Carb. ????
 

No, Send them to me and I'll dispose of them. Mark

Re: Mopar AVS Carb. ????
 

Who knows? He has a stage name. One would assume he reces a 283 in SS. He follows me around and throws daggers at me every chance he can get. Ouch, they hurt so bad! :rolleyes:
He thinks I know nothing because I haven't had my car on the track in some time. I am getting older so maybe he's right...
Hope the carb helps, I want to see that Challenger deep into the tens.

Re: Mopar AVS Carb. ????
 

Thanks for all the input!!! new carb is on...runs great now. time for a real pass now to fine tune it....Hope the weather stays like this........

Re: Mopar AVS Carb. ????
 

DON'T trash any AVS carbs, I will gladly take them off your hands ... PM me and I will give you my address ... thanks