[HWYSTR455]

Originally Posted by Mike Davis

I have a set if 800 E-AFB's and have been 9.90's with them. They are not as quick as my Competition Series AFB 750's but run good. On the street they idle well, mid throttle cruise is good. I take any new carb apart and clean it before I put it on anything. Have seen trash and mismatched jets in all of them from Holley', BG's, Quickfuel and E carbs. These carbs get a bad rap but I think allot of time it's the tuning. These carbs are sensitive to fuel pressure. I only run 5lbs. They are probably one of the easiest carbs to tune.

Yup. You have to check EVERYTHING, period.

I fixed a E carb, it too had trash in it and some casting flash that needed doctoring, but did get it to run well. I've run AFBs before, like them, but usually stick to Holleys.

There's something about the E carb secondaries that leaves something to be desired, but can't recall at the moment. I think in general they do get a bad rap they don't deserve.

Should be no reason why you can't go thru it and make it run acceptably well.

.

[77 TRASHCAN]

Originally Posted by HWYSTR455

Yup. You have to check EVERYTHING, period.

I fixed a E carb, it too had trash in it and some casting flash that needed doctoring, but did get it to run well. I've run AFBs before, like them, but usually stick to Holleys.

There's something about the E carb secondaries that leaves something to be desired, but can't recall at the moment. I think in general they do get a bad rap they don't deserve.

Should be no reason why you can't go thru it and make it run acceptably well.

.

Secondaries come in at same rate, whether it's a 454 or a 283. Weighted arm controls rate

[pastry_chef]

Originally Posted by 77 TRASHCAN

Secondaries come in at same rate, whether it's a 454 or a 283. Weighted arm controls rate

The OP noted Edelbrock 1806 has an adjustable secondary air valve.

[HWYSTR455]

I don't think the secondaries are adjustable on any of them, but could be wrong:

https://www.edelbrock.com/pub/media/...ers-manual.pdf

I remember back in the AFB days, you muck with the weights and you are going in the wrong direction, you can get lost. The objective is to manage vacuum during the throttle opening range. That can be done with tuning the primaries and secondaries with jets, rods, etc. If it's too fat, vacuum drops off, too lean, and vacuum is higher. Have to find the balance, or that's how I remember it.

I can't remember if there are different plunger springs, but I don't think so. I do remember some folks trimming them or stretching them out/shimming pocket, to fine tune. That too, you can get lost.

The biggest reason I went away from the AFBs is due to the side bowls, high G turns it could flood. Holleys generally could have flood issues on hard acceleration/braking. In my case, it was easier to deal with the acceleration/braking thing. So I switched. But I had a 2x4 AFB setup working very well. (on an Offy dual plane 360)

Original/old body castings can become porous, and actually seep through the body. Late in production, Carter, who may have actually been already bought out once, offered coated bodies, black, called Black Stallions. I at one point upgraded to those, and many of the porosity issues I had were resolved.

.

[pastry_chef]

Originally Posted by HWYSTR455

I don't think the secondaries are adjustable on any of them, but could be wrong:

https://www.edelbrock.com/pub/media/...ers-manual.pdf

That manual is for the original (old) series.

Here is the AVS Thunder Series.
Page 6 has the secondary details.
https://edeinstall.wpengine.com/wp-c...Carburetor.pdf

Seems they have a newer AVS2 series.
https://www.edelbrock.com/avs2-800-c...gine-1912.html

Might have a different version of secondary tuning --- "Additionally, the unique Qwik-Tune Secondary Air Valve allows for limitless calibration of the secondary circuit. Adjustments can be with simple hand tools in seconds to suit your application."

[HWYSTR455]

Originally Posted by pastry_chef

That manual is for the original (old) series.

Here is the AVS Thunder Series.
Page 6 has the secondary details.
https://edeinstall.wpengine.com/wp-c...Carburetor.pdf

Innnnteresting! Ok, yeah, adjusts the spring preload.

.

[HWYSTR455]

Another thing to note is that Carter, and believe Edelbrock, rate their' carbs' CFM differently than Holley, at a different mercury, and the same CFM rating by Holley on a AFB would result in too large of a carb. (AFBs having smaller numbers for rating that Holleys for same flow)

That can throw your sizing off, and, hence, your secondary opening rate.

Looks like Edlebrock may also offer the black ones.

.

[carbking]

Originally Posted by HWYSTR455

I don't think the secondaries are adjustable on any of them, but could be wrong:

https://www.edelbrock.com/pub/media/...ers-manual.pdf

I remember back in the AFB days, you muck with the weights and you are going in the wrong direction, you can get lost. The objective is to manage vacuum during the throttle opening range. That can be done with tuning the primaries and secondaries with jets, rods, etc. If it's too fat, vacuum drops off, too lean, and vacuum is higher. Have to find the balance, or that's how I remember it.

I can't remember if there are different plunger springs, but I don't think so. I do remember some folks trimming them or stretching them out/shimming pocket, to fine tune. That too, you can get lost.

The biggest reason I went away from the AFBs is due to the side bowls, high G turns it could flood. Holleys generally could have flood issues on hard acceleration/braking. In my case, it was easier to deal with the acceleration/braking thing. So I switched. But I had a 2x4 AFB setup working very well. (on an Offy dual plane 360)

Original/old body castings can become porous, and actually seep through the body. Late in production, Carter, who may have actually been already bought out once, offered coated bodies, black, called Black Stallions. I at one point upgraded to those, and many of the porosity issues I had were resolved.

.

The genuine Carter AFB carburetors are infinitely adjustable.

Since I banned the imitations from my shop after the first experience with the quality, I can honestly say I do not know (nor do I care) what tuning pieces are available for the imitations.

Jon

[HWYSTR455]

Thank you Jon, and after I posted, I went back and looked, and Carter did in fact offer a metering rod spring kit that included 3, and some 5 sets of diff springs. I think the springs were also offered individually, but my memory is failing me on that.

I believe I even spoke to you several times in the late 80s & early 90s regarding my 2x4 setup, but again, that was some time ago!


.

[SRR]

Originally Posted by pastry_chef

The OP noted Edelbrock 1806 has an adjustable secondary air valve.

I just assumed it was an AFB. The AVS is a good carb. it just sounds like poor quality control seems to be the root of most "shiney" parts.