Does anyone make Custom Carter/ Edelbrock metering rods?

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slant six

slant six

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Hello, sorry if this is a silly question.

My lathe (or opererator-me) is not percise enough to do this.. or I would not be asking, and I would just make my own.
Does anyone out there make custom Edelbrock metering rods for afb/ avs?

I am close to what I want with the primary tune, but one set of rods is lean on primary/ rich secondary and another is Rich primary and lean secondary.

I am still playing with step up springs as well .

Thanks Sages!
 
slant six said:
Hello, sorry if this is a silly question.

My lathe (or opererator-me) is not percise enough to do this.. or I would not be asking, and I would just make my own.
Does anyone out there make custom Edelbrock metering rods for afb/ avs?

I am close to what I want with the primary tune, but one set of rods is lean on primary/ rich secondary and another is Rich primary and lean secondary.

I am still playing with step up springs as well .

Thanks Sages!
Click to expand...
Try these cats. I've gotten several things from them in the past and they have some things I've not seen anywhere else.

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slant six said:
Hello, sorry if this is a silly question.

My lathe (or opererator-me) is not percise enough to do this.. or I would not be asking, and I would just make my own.
Does anyone out there make custom Edelbrock metering rods for afb/ avs?

I am close to what I want with the primary tune, but one set of rods is lean on primary/ rich secondary and another is Rich primary and lean secondary.

I am still playing with step up springs as well .

Thanks Sages!
Click to expand...
I think you can only get so close. Holley people drive them selves nuts too.
 
slant six said:
Hello, sorry if this is a silly question.

My lathe (or opererator-me) is not percise enough to do this.. or I would not be asking, and I would just make my own.
Does anyone out there make custom Edelbrock metering rods for afb/ avs?

I am close to what I want with the primary tune, but one set of rods is lean on primary/ rich secondary and another is Rich primary and lean secondary.

I am still playing with step up springs as well .

Thanks Sages!
Click to expand...
Back in the 90's I was chasing the tune on a Thermoquad... Found four sets of metering rods with the exact same markings that ran differently, mic-ing the steps found the numbers were all over the place... I don't think you can get that level of precision with a carb..
 
Carter had some offerings that have been long discontinued that are different from the Edelbrock stuff currently available.

I don’t know exactly what you’re looking for, but you might look into old Carter rods or strip kits on eBay or similar. I didn’t get too deep into it, but I know some of the old Carter strip kits contain metering rods with specs you can’t get now.
 
You can get larger rods & file flats on the sides [ think of the chord of as circle ]. I have done it many times. A maths book [ or the web ] will give you the formula for the amount of metal removal reqd.
 
I'm reminded of the tuning in the MP Engine manual for making "clubfoot" and other style of metering rods. But either way with your current selection and (assuming your main jets are correct, and I'm guessing you're full throttle plug readings are good), it sounds like you need to put metal back on one end or the other. I think take the thickest set and file and fit to what you need.
 
I think I might have a couple NOS Carter Strip Kits for the AFB. AFB and AVS are different, aren't they?
 
AVS have rods with 3 steps, AFB have 2 step. They can be interchanged as long the piston covers are changed [ AFB has flat cover, AVS has as raised section ]. Pistons are the same.
 
slant six said:
Hello, sorry if this is a silly question.

My lathe (or opererator-me) is not percise enough to do this.. or I would not be asking, and I would just make my own.
Does anyone out there make custom Edelbrock metering rods for afb/ avs?

I am close to what I want with the primary tune, but one set of rods is lean on primary/ rich secondary and another is Rich primary and lean secondary.

I am still playing with step up springs as well .

Thanks Sages!
Click to expand...
What make and model lathe do you have and why do you think it isn't precise enough?

You aren't going to be successful lathe cutting small diameter shafts like that without additional support that specialized machines have. But, you could probably do it using a tool post grinder instead of a turning bit. Doesn't have to be a real TP grinder for something like this, any decent die grinder that can be mounted to the tool post and present a stone to the rod will work. Having a revolving collet/chuck in the tailstock would be helpful. A homemade follower rest helps too. Take light cuts and let it spark out and you'll get past any flex in the part.
I plan on making a setup like this to do some rods for a Thermoquad Competition carb, maybe this winter.
 
Mine has no rods. Jets and air-bleeds.
Krusty Impastato Thermoquad.jpg

Krusty Thermoquad jets.jpg
 
MMissile said:
Mine has no rods. Jets and air-bleeds.
View attachment 1716455401
View attachment 1716455402
Click to expand...
Exactly. I would think it would be faster to swap rods, than it would to change the jets? You can really fine tune or theoretically change the rod diameter along it's length if that was beneficial. Also, mine is one of the early models that takes press in jets, which are unobtanium and seemingly more fiddley to change, so I'm going to see it I can modify it to take some sort of screw in jets. May be a big waste of effort, but it all makes sense in my mind.
 
gzig5 said:
Exactly. I would think it would be faster to swap rods, than it would to change the jets? You can really fine tune or theoretically change the rod diameter along it's length if that was beneficial. Also, mine is one of the early models that takes press in jets, which are unobtanium and seemingly more fiddley to change, so I'm going to see it I can modify it to take some sort of screw in jets. May be a big waste of effort, but it all makes sense in my mind.
Click to expand...
That's the same jet setup mine had originally. A great friend and Thermoquad whiz, handmade the jet and air-bleed setup for mine. He's done lots of NHRA stock and superstock Thermoquads.
The later version of the Comp TQ, had screw-in jets. Mine is about as much as you can do to one. It's very responsive, and made well over 700 hp on my engine.
Once we get a couple bugs out of the car, and figure out the suspension....I'll start messing with the jetting in the TQ.

I have 2 more Comp Series units in the shop. I gotta check the numbers. I know they have different fuel-inlet positions...
 
Last edited:
Bewy said:
AVS have rods with 3 steps, AFB have 2 step. They can be interchanged as long the piston covers are changed [ AFB has flat cover, AVS has as raised section ]. Pistons are the same.
Click to expand...
Thank you - That Might be an idea worth investigating.

Do the Current Edelbrock AVS's Have 3 stepped rods or 2?
 
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