Mopar AVS Carb. ????

Jim Storms · 03-19-2010, 06:43 PM

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

GTX JOHN · 03-19-2010, 11:08 PM

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

Jim Storms · 03-20-2010, 10:43 AM

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

Moparteacher · 03-20-2010, 12:07 PM

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

Jim Storms · 03-20-2010, 12:36 PM

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......................

James L Miller · 03-20-2010, 02:59 PM

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.

George Mirza · 03-20-2010, 08:36 PM

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.

Jim Storms · 03-20-2010, 08:53 PM

Quote:

Originally Posted by George Mirza

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.

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.

GTX JOHN · 03-20-2010, 10:54 PM

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.

Jim Storms · 03-21-2010, 11:33 AM

Quote:

Originally Posted by GTX JOHN

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.

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....

03-19-2010, 06:43 PM	#1
Jim Storms Member Join Date: Aug 2005 Location: Renton, Washington Posts: 320 Likes: 0 Liked 4 Times in 2 Posts	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

03-19-2010, 11:08 PM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,486 Times in 697 Posts	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 crp. 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 sx doll in my Demon again. John Irving

03-20-2010, 10:43 AM	#3
Jim Storms Member Join Date: Aug 2005 Location: Renton, Washington Posts: 320 Likes: 0 Liked 4 Times in 2 Posts	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

03-20-2010, 12:07 PM	#4
Moparteacher Junior Member Join Date: Nov 2007 Location: Boise Posts: 49 Likes: 0 Liked 0 Times in 0 Posts	Re: Mopar AVS Carb. ???? The AVS doesn't use a check ball inder the plunger. There's an inverted brass needle under the squirter. __________________ Gary Weaver Moparteacher@yahoo.com

03-20-2010, 12:36 PM	#5
Jim Storms Member Join Date: Aug 2005 Location: Renton, Washington Posts: 320 Likes: 0 Liked 4 Times in 2 Posts	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......................

03-20-2010, 02:59 PM	#6
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	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. __________________ Mopar 2 Ya!

03-20-2010, 08:36 PM	#7
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	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.

03-20-2010, 10:54 PM	#9
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,486 Times in 697 Posts	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. Last edited by GTX JOHN; 03-21-2010 at 02:27 AM.